[TECHNICAL FIELD]
[0001] The present invention relates to an oven wall viewing apparatus for viewing a high
temperature oven wall such as an oven wall of a coking chamber of a coke oven and
an oven wall shape measurement apparatus for measuring the surface shape of a high
temperature oven wall.
[BACKGROUND ART]
[0002] In a high temperature oven section such as a coking chamber of a coke oven, the oven
walls making up the oven section are made of refractories. It is necessary to maintain
an accurate grasp over the state of deterioration of the refractories. In particular,
a coking chamber of a coke oven is continuously operated under harsh conditions over
a long period of usually over 20 years. The refractory brick making up the coking
chamber gradually deteriorate due to thermal, chemical, and mechanical factors.
[0003] Therefore, clogging of the coke due to deterioration of the refractory brick will
arise and pieces of the refractory brick will fall off. If pieces of the refractory
brick fall off or other such trouble occurs, repair will be difficult and will have
a notable effect on operations. Accordingly, maintaining a constant grasp over the
state of the refractory brick making up the inside of the coking chamber, in particular
the oven walls, is extremely important in managing the operation of a coke oven.
[0004] With the method of viewing the walls inside an oven by the naked eye from the oven
jamb of the coke oven using the short time between operations, since the inside of
the oven is high in temperature, it is necessary to view the inside from the outside
of the oven jamb. Further, since the coking chamber is narrow in width while the oven
is deep in depth, the refractories at the inside wall deep in the oven are viewed
from a great distance at a shallow angle and therefore viewing of the surface is extremely
difficult.
[0005] As a means for more accurately maintaining a grasp over the state of the oven wall
refractories, there is the method of capturing an image of the oven walls and the
method of measuring the relief shape of the oven walls.
[0006] If capturing an image of the oven walls, it is possible to visually determine two-dimensionally
the state of cracks in the brick or gaps in the joint. Further, carbon deposits are
high in luminance compared with the exposed parts of the surrounding brick, so their
locations can be confirmed from an image of the oven walls. By measuring the relief
shape of the oven walls, it is possible to obtain a quantitative grasp over the state
of damage of the brick.
[0007] The relatively small damaged parts of the oven walls of a coking chamber are repaired
by filling them by melt spraying a refractory, while missing parts of brick are fit
with refractory brick and refractory is melt sprayed for the joint. Therefore, it
is important to view the surface by the necessary resolution and discover and obtain
a grasp of the positions of damage in a state where the inside of the coking chamber
is red hot.
[0008] As methods for capturing an image of the oven walls, there are the following. Japanese
Unexamined Patent Publication (Kokai) No. 3-105195 discloses a method of inserting
a camera conveyance boom mounting a camera (ordinary two-dimensional ITV camera) into
a coke oven from the oven jamb of the oven coking chamber and capturing an image of
the oven inside wall surfaces while moving the camera in the oven length direction.
A coking chamber is extremely narrow in width, so if the camera is oriented to directly
face an inside wall of the coking chamber, a sufficient distance cannot be obtained
between the camera and the inside wall, the capture range becomes narrower, and the
necessary range of the image cannot be obtained, so the camera is mounted at a slant
with respect to the wall surface and the wall surface is captured in the field of
vision at a shallow angle.
[0009] In the method disclosed in Japanese Unexamined Patent Publication (Kokai) No. 2001-3058
as well, the image is captured by a camera from a direction slanted with respect to
the oven walls. In the method described in Japanese Unexamined Patent Publication
(Kokai) No. 2001-11465, a video camera housed in a heat insulated container is oriented
vertical to the wall surface to capture an image.
[0010] In the methods described in Japanese Unexamined Patent Publication (Kokai) No. 2001-3058
and Japanese Unexamined Patent Publication (Kokai) No. 2001-11465, a camera or data
recorder is housed inside a heat insulated container. No cooling water is supplied
from outside of the oven, therefore cooling water pipes are not required. Measurement
and recording of the obtained image data or measurement data are completed inside
an inspection unit inside a heat insulated container, signal wires and power lines
etc. do not have to be laid inside the high temperature coking chamber, and a water
cooling structure for these wires is not required, thereby realizing inspection of
the wall surface by a simple structure.
[0011] Japanese Unexamined Patent Publication (Kokai) No. 61-114085 discloses a method of
housing a prism and television camera inside a water-cooled box and reflecting onto
a television camera the situation inside the oven reflected at the prism through a
viewing window of the water-cooled box.
[0012] In the method described in Japanese Unexamined Patent Publication (Kokai) No. 3-105196,
a refractory mirror surface is arranged at a pusher ram head of a coke pusher and
an image of the wall surface inside the coking chamber reflected at the mirror surface
is captured by a telescopic television camera provided with a zoom lens. The telescopic
television camera is arranged outside of the coking chamber and an image reflected
on the mirror surface inside the oven is captured through the oven jamb. By moving
the pusher ram head from the oven jamb of the coking chamber to the opposite side
oven jamb, the state of the entire wall surface inside the coking chamber can be recorded
as image information along with position information. It is possible to adjust the
magnification rate and focus of the zoom lens in accordance with the distance between
the mirror surface and the camera.
[0013] In the method described in Japanese Unexamined Patent Publication (Kokai) No. 3-105195
or Japanese Unexamined Patent Publication (Kokai) No. 2001-3058, the camera is mounted
at a slant with respect to the wall surface to capture an image of the wall surface
inside the field of vision by a shallow angle, so the image at the side closer to
the camera becomes narrower in the capture range, while the image of the side far
from the camera conversely has a broad capture range, but only covers a small area
and therefore the necessary resolution cannot be obtained. Further, with such a capture
method, it is difficult to focus over the entire field of vision.
[0014] In the method described in the above publication, the obtained perspective image
is processed to convert it to a front image as if captured directly facing the oven
wall, but even with such image processing, the facts remain that a sufficient resolution
cannot be obtained for the parts captured from a far distance and that it is difficult
to focus the image over the entire field of vision. Further, with viewing from such
a slanted direction, fine cracks in the vertical direction in the oven wall surface
and gaps in the joint between the bricks are difficult to see.
[0015] With the method of orienting the video camera vertical to the oven wall to capture
an image described in Japanese Unexamined Patent Publication (Kokai) No. 2001-11465,
since the distance between the left and right oven walls of the coking chamber is
extremely narrow, it is not possible to obtain a sufficient distance between the lens
of the video camera and the oven wall and therefore the range of the surface of the
oven wall which can be captured by a single field of vision of the video camera becomes
extremely narrow.
[0016] In the method of housing a camera or data recorder inside a heat insulated container
described in Japanese Unexamined Patent Publication (Kokai) No. 2001-3058 and Japanese
Unexamined Patent Publication (Kokai) No. 2001-11465, there is the advantage that
the apparatus can be made lighter in weight and can be simply attached to and detached
from a pusher or other moving apparatus. On the other hand, since an apparatus inside
a heat insulated container cannot send and receive signals with an apparatus outside
the oven, the obtained image information cannot be directly combined with position
information of the camera and it is difficult to obtain an accurate grasp of the position
in the oven of damaged locations from the image information.
[0017] Further, the recorded data has to be taken out from the heat insulated container
and played back, so the data cannot be played back until the heat insulated container
taken out from the oven sufficiently cools. Therefore, the work efficiency is poor
when viewing a plurality of coking chambers.
[0018] Further, while a "heat insulated container", it merely blocks the heat by a heat
insulating material, so the time which it can reside in an oven in a high temperature
state like a coke oven is at most about 3 minutes. Even if inserting the pusher of
a coke oven in the oven and moving it in the oven by one stroke, normally about 3
minutes of time is required. Therefore, with a time which the container can reside
in the oven of at most 3 minutes, there is little margin of time. If time is required
for pushing, the camera apparatus or other electronic equipment would probably be
damaged.
[0019] In the method of housing a prism and television camera inside a box described in
Japanese Unexamined Patent Publication (Kokai) No. 61-114085, if trying to capture
a sufficiently broad region of the oven wall surface, it would be necessary to increase
the size of the viewing window of the box. If using a heat insulated container without
using a water-cooled box, the temperature of the inside of the heat insulated container
would remarkably rise due to the heat penetrating from this large viewing window and
the container cannot remain for the time required for viewing in the high temperature
oven.
[0020] In the method of arranging a refractory mirror surface at the pusher ram head and
capturing an image of the oven wall reflected on the mirror surface by a telescopic
television camera provided outside of the oven described in Japanese Unexamined Patent
Publication (Kokai) No. 3-105196, in particular when capturing an image of the vicinity
of the oven jamb at the side far from the television camera, the distance between
the mirror surface and the television camera becomes larger. Since the inside of the
coking chamber has a large amount of dust, it is difficult to capture an image of
the oven wall reflected at the mirror surface by a camera outside of the oven.
[0021] Further, a refractory mirror surface deforms along with the sharp rise in temperature
when inserted from the ordinary temperature outside of the oven to the high temperature
inside of the oven, so it is necessary to preheat the container by a preheater before
insertion. Further, by exposure to the high temperature oven atmosphere, the surface
of the mirror surface clouds and it is difficult to maintain the optical performance
over a long period of time.
[0022] In the method of measuring the relief shape of the oven wall, in the past an oven
width meter was used for the coking chamber of the coke oven. When the left and right
oven walls face each other in parallel in a narrow oven section like with the oven
walls of the coking chamber, if the oven wall refractories are damaged or the oven
wall deforms due to the side pressure received at the time of pushing the coke, the
distance between the two oven walls increases. Therefore, by measuring the distance
between the two oven walls, it is possible to estimate the soundness of the refractories
forming the oven walls.
[0023] When placing a range finder inside the oven and measuring the distance between the
range finder and an oven wall, it is necessary to accurately position the range finger
at a certain position in the oven. On the other hand, in the method of measuring the
distance between oven walls as explained above, even if there is lateral movement
of the oven wall measuring apparatus, no large error is given to the measured value
of the distance between oven walls. Therefore, in the method of measuring the distance
between oven walls, it is not necessary to strictly position the measurement apparatus.
For example, it is possible to measure the oven width by mounting an oven width measurement
apparatus to a pusher ram of a coke pusher.
[0024] As such an oven width measurement apparatus, for example, Japanese Unexamined Patent
Publication (Kokai) No. 62-293112 discloses to provide a ram of a coke pusher etc.
with a pair or a plurality of pairs of noncontact type range finders oriented to the
oven walls, simultaneously measure the left and right walls from the mounting position,
and continuously measure the width of the coking chamber from the total distances.
By moving the pusher horizontally, it is possible to continuously measure the width
between the oven walls in the coking chamber.
[0025] However, in the above method of measuring the oven width, it is not possible to independently
evaluate the relief of the left and right oven walls. In the method of measurement
of damaged parts of partitions of a coke oven described in Japanese Unexamined Patent
Publication (Kokai) No. 8-73860, a probe is prepared for insertion from a coal charging
port or peephole at the top of the coke oven, a line of light of projected from a
light projector arranged in the probe to the partition by a projection angle θ, the
partition is captured by a camera, and the displacement of the partition and the width
of the damaged parts and amount of relief of the damaged parts are measured from the
amount of displacement of the line of light in the image.
[0026] The probe is cooled by circulation of cooling water. The image of the partition is
bent at a right angle by a prism arranged inside the probe and captured by the camera.
The side surface of the probe is formed with a window provided with heat resistant
glass for projection of light from the projector and capturing an image by the camera.
[0027] This method enables independent evaluation of the amount of damage of the oven walls,
but since the probe is inserted from the coal charging port etc. at the top of the
coke oven, it is only possible to measure the part below the single coal charging
port by one measurement and difficult to evaluate the state of the oven wall over
a broad range in the longitudinal direction of the coking chamber in a short time.
[0028] In the method of evaluating the state of a high temperature oven wall such as the
oven wall of a coking chamber of a coke oven, while it is possible to evaluate the
amount of brick damage quantitatively for linear parts of the oven wall with measurement
of the oven width or measurement of the relief by a line of light, it is not possible
to obtain a grasp of the two-dimensional state of the oven wall as a whole. Conversely,
with the method of capturing an image of an oven wall, while it is possible to obtain
a grasp of the overall two-dimensional state of an oven wall, it is not possible to
obtain a quantitative grasp of the amount of damage.
[0029] As reasons of reduction of the oven width, there are deformation of the brick oven
surface itself and carbon deposition, but in measurement of the oven width or measurement
of relief by a line of light, even if it is known that the oven width has become narrower,
it is not possible to identify the reason for the oven width becoming narrower. With
carbon deposition, it is sufficient to blow in air to burn away the carbon, but with
deformation of the wall surface itself, sometimes large-scale repair work becomes
necessary.
[0030] In the method of housing a camera and prism in a probe described in Japanese Unexamined
Patent Publication (Kokai) No. 8-73860, in the same way as the method described in
Japanese Unexamined Patent Publication (Kokai) No. 61-114085, it is necessary to increase
the size of the viewing window formed in the box or probe if trying to capture an
image of a sufficiently broad oven wall surface region.
[0031] When using a heat insulated container without using a water-cooled box, due to the
heat penetrating from the large viewing window, the temperature inside the heat insulated
container remarkably rises and it is no longer possible for the viewing apparatus
to remain inside the high temperature oven for the time required for viewing.
[SUMMARY OF THE INVENTION]
[0032] The present invention has as its first object the provision of an oven wall viewing
apparatus for viewing the surface of facing oven walls of a coking chamber of a coke
oven which is compact in size and light in weight, does not require coolant water
piping etc., is able to be easily attached to and detached from a pusher or other
moving apparatus, is able to view the necessary viewing range at a wall surface, and
has sufficient durability.
[0033] The present invention has as its second object the provision of such an oven wall
viewing apparatus which is able to combine the captured oven wall image information
and capture position information while maintaining the advantages of being compact
in size, light in weight, and simple in structure and is able to propose an oven wall
repair plan quickly utilizing the capture results.
[0034] The present invention has as its third object the provision of such an oven wall
viewing apparatus which is able to sufficiently secure residence time in the high
temperature oven while maintaining the advantages of being compact in size, light
in weight, and simple in structure.
[0035] The present invention has as its fourth object the provision of an oven wall shape
measurement apparatus for measuring the surface shape of facing oven walls such as
high temperature oven walls of a coking chamber of a coke oven which is able to evaluate
the state of a broad two-dimensional range of an oven wall by an image and is able
to quantitatively evaluate the state of damage of a specific location and further
which is compact in size and light in weight, does not require coolant water piping
etc., is able to be easily attached to and detached from a pusher or other moving
apparatus, is able to view the necessary viewing range at a wall surface, and has
sufficient durability.
[0036] The present invention has as its fifth object the provision of such an oven wall
shape measurement apparatus which is able to combine the captured oven wall image
information and capture position information while maintaining the advantages of being
compact in size, light in weight, and simple in structure and is able to propose an
oven wall repair plan quickly utilizing the capture results.
[0037] The present invention further has as its sixth object the provision of an oven wall
shape measurement apparatus able to sufficiently secure a high temperature oven residence
time while maintaining the advantage of the compact size, light weight, and simplicity
of the above oven wall shape measurement apparatus.
[0038] The present invention was made to achieve the above objects. The gist of the oven
wall viewing apparatus of the present invention is as follows:
(1) An oven wall viewing apparatus for viewing surfaces of facing oven walls, said
oven wall viewing apparatus characterized by housing a camera apparatus in a heat
insulated container, arranging a mirror surface at the outside of said heat insulated
container, and capturing an image of an oven wall surface reflected at said mirror
surface by said camera apparatus.
(2) An oven wall viewing apparatus as set forth in (1), characterized in that said
mirror surface is comprised of two mirror surfaces of different angles and in that
said mirror surfaces reflect surfaces of the facing oven walls.
(3) An oven wall viewing apparatus as set forth in (1) or (2), characterized in that
said mirror surface is comprised of the surface of the container containing cooling
water inside it.
(4) An oven wall viewing apparatus as set forth in any one of (1) to (3), characterized
in that said heat insulated container houses a wireless transmitter, a wireless receiver
and data recorder are arranged outside the oven, and information captured by said
camera apparatus is transmitted from said wireless transmitter to said wireless receiver
and is recorded at said data recorder.
(5) An oven wall viewing apparatus as set forth in any one of (1) to (3), characterized
in that said heat insulated container houses a data recorder and information captured
by said camera apparatus is recorded in the data recorder.
(6) An oven wall viewing apparatus as set forth in (4) or (5), characterized in that
said data recorder also records position information of the camera apparatus inside
the oven.
(7) An oven wall viewing apparatus as set forth in any one of (1) to (6), characterized
in that said heat insulated container has a jacket filled with a liquid having a heat
absorbing ability and further a heat insulating material covering it at the outside.
(8) An oven wall viewing apparatus as set forth in any one of (1) to (7), characterized
by capturing an image while moving said camera apparatus in a depth direction of the
oven and recording the captured data in said data recorder.
(9) An oven wall viewing apparatus as set forth in (8), characterized in that said
data recorder combines a plurality of captured data obtained by capturing an image
to obtain an image of a broad region in a depth direction of the oven.
(10) An oven wall viewing apparatus as set forth in any one of (1) to (9), characterized
in that said oven walls are oven walls of a coking chamber of a coke oven and in that
said heat insulated container and mirror surface are arranged at a pusher of the coke
oven.
(11) An oven wall shape measurement apparatus for measuring a surface shape of facing
oven walls, said oven wall shape measurement apparatus characterized by housing a
light beam emitter and camera apparatus in a heat insulated container, arranging a
mirror surface at the outside of said heat insulated container, emitting a light beam
from said light beam emitter to the oven walls from a slanted direction, capturing
an image of the surfaces of the oven walls reflected at said mirror surface including
light beam reflected light by said camera apparatus, and measuring the oven wall shape
based on the position of the light beam reflected light.
(12) An oven wall shape measurement apparatus as set forth in (11), characterized
in that the light beam emitted to said oven walls is emitted in a line to the oven
walls.
(13) An oven wall shape measurement apparatus as set forth in (12), characterized
by emitting the light beam directly from said light beam emitter and in that a direction
of the line of light emitted to the oven walls is substantially parallel to the intersecting
line of the wall surface and the mirror surface.
(14) An oven wall shape measurement apparatus as set forth in (12), characterized
by emitting the light beam from said light beam emitter and reflecting it at said
mirror surface and in that a direction of the line of light emitted to the oven walls
is substantially perpendicular to the intersecting line of the wall surface and the
mirror surface.
(15) An oven wall shape measurement apparatus as set forth in any one of (11) to (14),
characterized in that said light beam emitter is a laser light emitter for emitting
light of not more than a wavelength of 550 nm and in that said camera apparatus is
a color camera apparatus.
(16) An oven wall shape measurement apparatus as set forth in (15), characterized
by processing the image captured at said camera apparatus and, when measuring the
oven wall shape from the position of the light beam reflected light, processing the
image while emphasizing the light range of a wavelength of less than 550 nm.
(17) An oven wall shape measurement apparatus as set forth in any one of (11) to (16),
characterized by having a means for measuring the intensity of the thermal radiation
light of the oven wall surface to which said light beam is emitted and adjusting the
intensity of the light beam emitted from said light beam emitter in accordance with
the measured intensity of the thermal radiation light.
(18) An oven wall shape measurement apparatus as set forth in any one of (11) to (17),
characterized in that said heat insulated container is provided inside it with a plurality
of light beam emitters, the light beam emitters emit light beams to the surfaces of
the facing oven walls, said mirror surface is comprised of two mirror surfaces of
different angles, and said mirror surfaces reflect surfaces of the facing oven walls
including light beam reflected lights.
(19) An oven wall shape measurement apparatus as set forth in any one of (11) to (18),
characterized in that said mirror surface is comprised of the surface of the container
containing cooling water inside it.
(20) An oven wall shape measurement apparatus as set forth in any one of (11) to (19),
characterized in that said heat insulated container houses a wireless transmitter,
a wireless receiver and data recorder are arranged outside the oven, and information
captured by said camera apparatus is transmitted from said wireless transmitter to
said wireless receiver and is recorded at said data recorder.
(21) An oven wall shape measurement apparatus as set forth in any one of (11) to (20),
characterized in that said heat insulated container houses a data recorder and information
captured by said camera apparatus is recorded in the data recorder.
(22) An oven wall shape measurement apparatus as set forth in (20) or (21), characterized
in that said data recorder also records position information of the camera apparatus
inside the oven.
(23) An oven wall shape measurement apparatus as set forth in any one of (11) to (22),
characterized in that said heat insulated container has a jacket filled with a liquid
having a heat absorbing ability and further a heat insulating material covering it
at the outside.
(24) An oven wall shape measurement apparatus as set forth in any one of (11) to (23),
characterized in that said oven walls are oven walls of a coking chamber of a coke
oven and in that said heat insulated container and mirror surface are arranged at
a pusher of the coke oven.
[BRIEF DESCRIPTION OF THE DRAWINGS]
[0039]
FIG. 1 is a plan view of an oven wall viewing apparatus of the present invention having
a jacket filled with a liquid.
FIG. 2 is a perspective view of an oven wall viewing apparatus of the present invention.
FIG. 3 is a side view of an oven wall viewing apparatus or oven wall shape measurement
apparatus of the present invention installed in a coke pusher.
FIG. 4 is a plan view of an oven wall viewing apparatus of the present invention having
one mirror surface.
FIG. 5 is a plan view of an oven wall viewing apparatus of the present invention having
two mirror surfaces.
FIG. 6 is a plan view of an oven wall viewing apparatus of the present invention having
a wireless transmitter.
FIG. 7 is a side view of a heat insulated container of the present invention having
a jacket filled with a liquid.
FIG. 8 is a conceptual view of the state of connection of equipment of the present
invention having a wireless transmitter and receiver.
FIG. 9 gives views of examples of results of viewing by an oven wall viewing apparatus
of the present invention. (a) is a view of an image of the two oven walls reflected
at the two mirror surfaces, (b) is a view of an image of a location where the oven
wall has been damaged, and (c) is a view of an image showing the state of carbon deposition
on the oven walls.
FIG. 10 is a view of another example of the results of viewing by an oven wall viewing
apparatus of the present invention.
FIG. 11 is a plan view of an oven wall shape measurement apparatus of the present
invention.
FIG. 12 gives perspective views schematically showing an oven wall shape measurement
apparatus of the present invention having two mirrors. (a) is a view schematically
showing the apparatus as a whole, while (b) is a view schematically showing the case
focusing on one light beam emitter.
FIG. 13 is a conceptual view of the state of a light beam emitted to oven walls from
a slanted direction.
FIG. 14 gives conceptual views of the state of a light beam emitted to oven walls
from a slanted direction in a line. (a) is a view of the oven walls seen from the
side, (b) is a perspective view along the line A-A, and (c) is a perspective view
along the line B-B.
FIG. 15 gives conceptual views of the state of emission of light beams to the oven
walls from a slanted direction in a line by reflection at a mirror surface. (a) is
an overall conceptual view, while (b) is a perspective view along the line B-B focusing
on the light beam system.
FIG. 16 is a plan view of an oven wall shape measurement apparatus of the present
invention having one mirror surface.
FIG. 17 is a plan view of an oven wall shape measurement apparatus of the present
invention having two mirror surfaces.
FIG. 18 is a plan view of an oven wall shape measurement apparatus of the present
invention having a wireless transmitter.
FIG. 19 is a side view of a heat insulated container of the present invention having
a jacket filled with a liquid.
FIG. 20 shows an example of the results of viewing by an oven wall shape measurement
apparatus of the present invention. (a) is a view of an image of two oven walls reflected
at two mirror surfaces, while (b) is a view of a location where the oven wall has
been damaged,
FIG. 21 shows another example of the results of viewing by an oven wall shape measurement
apparatus of the present invention. (a) is a view of an image of two oven walls reflected
at the two mirror surfaces, (b) is a view of an image of a location where the oven
wall has been damaged, and (c) is a view of an image showing the state of carbon deposition
on the oven walls.
FIG. 22 is a view of another example of the results of viewing by an oven wall viewing
apparatus of the present invention.
FIG. 23 is a view of the present invention for adjusting the intensities of the light
beams emitted from light beam emitters in accordance with an intensity of thermal
radiation light.
[THE MOST PREFERRED EMBODIMENT]
[0040] (1) First, an oven wall viewing apparatus of the present invention will be explained
based on FIG. 1 to FIG. 8.
[0041] The oven wall viewing apparatus of the present invention (hereinafter sometimes referred
to as the "viewing apparatus of the present invention") covers an oven wall viewing
apparatus used inside a coking chamber 41 of an oven having high temperature oven
walls 42a and 42b facing each other across a narrow gap, for example, a coke oven.
[0042] As a camera apparatus 8, it is possible to use a CCD camera, a camera controller
for controlling the same, etc.. The direction of the field of vision of the camera
apparatus 8 should be made parallel to the oven walls 42a and 42b as shown in FIG.
4 and FIG. 5. Further, the mirror surface 2 or 2a and 2b is arranged in the direction
of the field of vision of the camera apparatus 8 and the angle of the mirror surface
is adjusted so that the image of the oven wall surface is reflected at the mirror
surface 2 or 2a and 2b when viewed from the position of the camera apparatus 8.
[0043] Normally, as shown in FIG. 4 and FIG. 5, if the angle between the mirror surface
2 or 2a and 2b and the oven walls 42a and 42b is made 45°, it is possible to obtain
an image of the oven wall surface seen from a direction vertical to the surface. Therefore,
this is preferable.
[0044] In the method of viewing the oven wall from a slanted direction as in the past, there
was the problem the fine cracks in the vertical direction of the oven wall surface
or gaps in the joint between the bricks were difficult to see. In the viewing apparatus
of the present invention, it is possible to capture an image of the wall surface in
a state close to viewing the front surface, so it is possible to clearly obtain a
grasp of the fine cracks in the vertical direction or the gaps in the joint between
the bricks.
[0045] Of course, when it is possible to clearly view the relief of the surface of an oven
wall by viewing the wall surface from a slanted direction, it is possible to make
the angle between the mirror surface and oven wall an angle other than 45°.
[0046] During viewing of the inside of an oven, normally the distance between the camera
apparatus 8 and the mirror surface 2 or 2a and 2b is made constant. If the distance
between the camera apparatus 8 and the mirror surface 2 or 2a and 2b is increased,
it is possible to increase the effective length of the mirror surface in a direction
parallel to the oven wall and possible to enlarge the range of the field of vision
13 or 13a and 13b (length in long side) of the camera apparatus for viewing the mirror
surface.
[0047] On the other hand, the effective mirror surface width in the direction vertical to
the oven wall, that is, the width direction, cannot be increased since the distance
between the oven walls is narrow. Therefore, the range (short side length) of the
field of vision 13 or 13a and 13b of the camera apparatus cannot be increased.
[0048] In viewing of the coking chamber of a coke oven, if the long side length of the field
of vision 13 or 13a and 13b of the camera apparatus at the oven wall surface is made
about 500 to 600 mm, it is possible to view the surface by a spatial resolution of
about 1 mm - sufficient for detection of damage - by a general CCD camera. The short
side length of the field of vision 13 or 13a and 13b of the camera apparatus at the
oven wall surface becomes about 150 to 200 mm when viewing the oven wall from the
vertical direction.
[0049] As the direction of orientation of the mirror surface 2 or 2a and 2b, as shown in
FIGS. 1 to 5, the longitudinal direction of the mirror surface should be made the
height direction of the oven, that is, the direction orthogonal to the depth direction
of the oven. The depth direction of the oven is the direction of movement of the oven
wall viewing apparatus 1 when viewing the oven wall 42a and/or 42b. By viewing the
surface while moving the apparatus, it is possible to store the results of viewing
of the oven wall in the depth direction of the oven.
[0050] Therefore, by making the longitudinal direction of the mirror surface a direction
orthogonal to the depth direction of the oven (direction of movement), it is possible
to obtain the maximum capture information of the oven wall surface.
[0051] In the present invention, as shown in FIG. 1 and FIGS. 4 to 6, electronic equipment
such as the camera apparatus 8 is housed in a heat insulated container 3, and the
mirror surface 2 or 2a and 2b is arranged at the outside of the heat insulated container
3. The heat insulated container 3 is not supplied with cooling water from outside
of the oven and does not have power lines or signal wires connected to it.
[0052] Therefore, the oven wall viewing apparatus placed in the oven can be made light in
weight and compact in size and can be easily mounted to and detached from a structure
inserted into and moving in the oven, for example, a coke pusher 43 of a coke oven
coking chamber 41 (see FIG. 3).
[0053] As shown in FIG. 4 and FIG. 5, the heat insulated container 3 is covered on its surface
by a heat insulating material 4. If the time is short, it can remain in the high temperature
oven and operate the electronic equipment inside it normally. If inside the coking
chamber 41 of the coke oven, since the container can reside inside the oven for 3
minutes, it is possible to secure the minimum amount of time for insertion of the
coke pusher 43 mounting the oven wall viewing apparatus 1 into the oven, viewing of
the entire length in the depth direction of the oven, and extraction to the outside.
[0054] As the heat insulating material 4 covering the heat insulated container 3, it is
possible for example to use a ceramic fiber board, calcium silicate board, etc..
[0055] In the viewing apparatus of the present invention, the mirror surface 2 or 2a and
2b is arranged at the outside of the heat insulated container 3, so it is possible
to keep the viewing window 16 of the heat insulated container 3 for securing the field
of vision of the viewing apparatus down to the minimum size.
[0056] In the prior art housing a prism in a box, it is necessary to increase the size of
the viewing window provided in the box. When using a heat insulated container 3, there
was the problem of the temperature inside the container rapidly rising due to the
radiation heat penetrating the container from the viewing window, but by arranging
the mirror surface 2 or 2a and 2b at the outside of the heat insulated container 3
like in the viewing apparatus of the present invention, the viewing window 15 can
be made small, so the radiation heat entering from there can be kept down to the minimum
and a rise in temperature inside the heat insulated container can be prevented.
[0057] The viewing window 16 is provided with quartz glass or other heat resistant glass.
The heat resistant glass preferably has the function of passing visible light from
the outside and reflecting the radiation heat by a means such as metal-evaporation.
[0058] In the viewing apparatus of the present invention, as shown in FIG. 4, it is possible
to use a single mirror surface 2 to view one oven wall 42a. On the other hand, it
is also preferable to configure the mirror surface by two mirror surfaces (2a and
2b) different in angle as with the viewing apparatus of the present invention of the
above (2) and use the mirror surfaces to reflect the surfaces of the facing oven walls
(42a and 42b).
[0059] In the viewing apparatus of the present invention shown in FIG. 2 and FIG. 5, the
first mirror surface 2a reflects the surface of the first wall surface 42a, the second
mirror surface 2b reflects the surface of the second wall surface 42b, and the two
are simultaneously captured by a single camera apparatus 8.
[0060] Due to this, by moving the oven wall viewing apparatus housing the single camera
apparatus 8 once in the depth direction of the oven, it is possible to obtain the
results of viewing of the oven wall surface at the left and right sides. Further,
it becomes possible to simultaneously compare the left and right oven walls.
[0061] Further, it is possible to view the left and right oven walls by a single camera
apparatus 8, so it is possible to reduce the open area of the viewing window 16 of
the heat insulated container compared with when housing two camera apparatuses inside
a heat insulated container. The ratio of the radiation heat penetrating the inside
of the heat insulated container and raising the temperature becomes smaller.
[0062] Since the mirror surface of the viewing apparatus of the present invention is arranged
at the outside of the heat insulated container 3, the mirror surface is directly exposed
to the high temperature atmosphere inside the oven. In the viewing apparatus of the
present invention of the above (3), as shown in FIG. 5 and FIG. 6, the mirror surface
of the container 11 containing cooling water 6 inside is made the mirror surface (2a
and 2b).
[0063] The time when the viewing apparatus of the present invention resides in the high
temperature oven is short. If within this time, the cooling water 6 inside the container
11 rises in temperature and boils to cool the container 11 by boiling and maintains
the temperature of the container 11 at the boiling point of the cooling water (100°C).
The optical performance of the mirror surfaces 2 and 2b formed at the container surface
can be maintained over a long time and the flatness of the mirror surfaces 2 and 2b
can similarly be maintained over a long time.
[0064] The viewing apparatus of the present invention does not require the supply of cooling
water from the outside of the oven for cooling the mirror surfaces 2a and 2b. Further,
there is no need for use of a preheater of the mirror surfaces. Therefore, it is possible
to easily mount the apparatus on a coke pusher or other moving apparatus.
[0065] The container 11 containing cooling water 6 inside it, as shown in FIG. 2, FIG. 5,
and FIG. 6, may be made a long rectangular cross-section shape with two of its four
outer surfaces made mirror surfaces (2a and 2b) and the remaining two surfaces made
heat insulating by a heat insulating material 12 in accordance with need. It is simple
to make the container 11 itself out of stainless steel and polish the surface to a
mirror finish.
[0066] The image captured by the camera apparatus 8 in the heat insulated container has
to be recorded in a data recorder and the finally recorded data used to prepare image
information of the oven walls. The data recorder 22 may be housed inside the heat
insulated container as with the viewing apparatus of the present invention of the
above (5) (see FIG. 5).
[0067] Further, it is more preferable to house a wireless transmitter 18 inside the heat
insulated container and arrange the wireless receiver 21 and data recorder 22 outside
of the oven as with the viewing apparatus of the present invention of the above (4)
(see FIG. 3 and FIG. 6).
[0068] The information captured by the camera apparatus 8 is transmitted from the wireless
transmitter 18 to the wireless receiver 21 and recorded in the data recorder 22. If
designing the data recorder 22 so as to record the information in a recording computer
or other processor 30 and simultaneously display the captured image at an image display
31, it is possible to confirm the results of the viewing at the same time as inserting
the oven wall viewing apparatus inside the oven for viewing.
[0069] The heat insulated container returned from the 1000°C oven is high in temperature
at the outside, so the inside data cannot be taken out until after the elapse of a
certain time. As opposed to this, in the viewing apparatus of the present invention
of the above (4), the trouble of taking out the oven wall viewing apparatus from the
oven, then waiting until the apparatus cools before taking out the image data is not
required, so it is possible to quickly confirm the state of the oven walls.
[0070] Further, it is possible to immediately use the oven wall viewing apparatus taken
out from the coking chamber of the coke oven for viewing of the next coking chamber.
[0071] For the wireless communication from the heat insulated container inside of the oven
to outside of the oven, it is possible to use wireless transmission using electromagnetic
waves or wireless communication using visible light, infrared light, or other light.
For wireless communication, the wall of the heat insulated container 3 facing the
outside of the oven is provided with a communication window 17 as shown in FIG. 6.
[0072] When the window 17 is fit with heat resistant glass and electromagnetic waves are
used as the communication medium, a metal-evaporation coating is not used for the
coating for preventing penetration of radiation heat from the outside. A dielectric
substance such as a silica coating is coated.
[0073] As shown in FIG. 8, it is possible to use a digital wireless transmitter and receiver
(27 and 28) for transmitting a digital signal by electromagnetic waves for the wireless
communication. Since an analog image signal is output from the camera apparatus 8,
the signal is converted to a digital signal by an A/D converter 26, the digital signal
is transmitted by a digital wireless transmitter 27, and that signal is received by
a digital wireless receiver 28 outside of the oven.
[0074] The received digital signal can be converted to an analog signal by a D/A converter
29 and output to an image display 31 or can be input as a digital signal to a processor
30 etc..
[0075] When arranging a wireless transmitter 18 inside the heat insulated container, the
capture information is transmitted from the heat insulated container to an outside
wireless receiver 21 and the data recorded in an outside data recorder 22.
[0076] At that time, it is possible to simultaneously record the oven position information
of the camera apparatus (capture current position data 35 in horizontal direction
in oven) together with the capture information in the data recorder 22 such as with
the viewing apparatus of the present invention of the above (6).
[0077] The outside data recorder 22 is arranged outside of the oven, so it is possible to
calculate and fetch the capture current position data 35 of the camera apparatus 8
from the current position data of the pusher 43 mounting the camera apparatus 8.
[0078] As a result, in the outside data recorder 22, it becomes possible to establish correspondence
with the capture position in the horizontal direction and the capture data in real
time. During viewing, it is possible to identify the damaged locations in the oven
and locations requiring repair.
[0079] Conversely to the above, it is possible to provide a data recorder 22 and a wireless
receiver 21 inside the heat insulated container, wirelessly transmit the time of oven
insertion of the heat insulated container and the capture current position data 35
in the horizontal direction in the oven from the outside to the heat insulated container,
and simultaneously record the capture data and the capture current position data 35
in the horizontal direction of the oven to the data recorder 22 in the heat insulated
container.
[0080] For the wireless transmitter 18 and the wireless receiver 21, it is also possible
to use a transceiver provided with the functions of both transmission and reception.
[0081] The heat insulated container 3 preferably has a jacket 5 filled with a liquid 7 having
a heat absorbing ability and further a heat insulating material 4 covering the outside
such as the viewing apparatus of the present invention of the above (7) (see FIG.
1).
[0082] In general, the liquid selected may be one having a large heat capacity per mass
and volume. As a liquid able to be most easily obtained industrially and optimal as
a heat absorbing material, it is preferable to use water.
[0083] When inserting the heat insulated container 3 in the high temperature oven, since
the outside of the heat insulated container is covered by the heat insulating material
4, it is possible to reduce the amount of heat penetrating the inside through the
heat insulating material 4.
[0084] Further, since there is a jacket 5 filled with a liquid 7 having a heat absorbing
ability inside the heat insulating material 4, the heat penetrating the inside first
is used up to raise the temperature of the liquid 7, for example, water.
[0085] Water has a large heat capacity, so it is possible to delay the rise in temperature
inside the heat insulated container. Further, when the temperature of the water reaches
100°C, a large amount of the heat of vaporization is robbed by the boiling, so the
temperature inside the heat insulated container will never exceed 100°C.
[0086] To discharge the water vapor when the water reaches 100°C in temperature and starts
boiling, the top of the heat insulated container 3 is provided with an opening or
a safety valve is provided. The viewing apparatus of the present invention is characterized
in that pipes are not connected for supplying or discharging liquid during viewing
of the oven walls in the oven.
[0087] The width of the coke oven is usually about 400 mm. The viewing apparatus of the
present invention has to be made dimensions enabling insertion into this space with
some leeway. When using water as the heat absorbing liquid, the jacket holding the
water has a width of the water at the left and right of about 40 mm in the oven width
direction.
[0088] As the heat insulating material 4 at the outer circumference of the heat insulated
container 3, for example, it is possible to use a ceramic fiber board and make the
thickness of the heat insulating material 4 about 30 mm.
[0089] When the external dimensions of the oven wall viewing apparatus are made 500 mm length
× 300 mm width × 500 mm height, the internal space holding the oven wall viewing apparatus
becomes 380 mm length × 160 mm width × 300 mm height.
[0090] When inserting an oven wall viewing apparatus having such a shape into the coking
chamber 41 of a coke oven of an oven temperature of 1000°C, the temperature of the
internal space housing the oven wall viewing apparatus becomes, along with the elapsed
time after insertion, 25°C after 3 minutes, 40°C after 5 minutes, and 55°C after 7
minutes. The usual upper limit of the temperature used of the different electronic
equipment housed in the heat insulated container is about 50°C, so the container can
reside in the high temperature oven for at least 5 minutes.
[0091] In viewing of the oven wall of a coking chamber of a coke oven according to the viewing
apparatus of the present invention, when mounting the oven wall viewing apparatus
1 of the present invention on the coke pusher 43 for measurement, the car 40 of the
coke pusher 43 continuously successively repeats the work of pushing out the coke
of the coking chamber finished being carbonized while moving on rails at 5 to 10 minute
intervals. During that work, the apparatus views the oven walls of a large number
of coking chambers.
[0092] Due to one insertion into a coking chamber, the liquid in the heat insulated container
rises in temperature, so if the container were inserted into the next coking chamber
for measurement as it were without any time interval, the temperature of the liquid
7 in the heat insulated container 3 would successively rise and the possible time
of residence in the oven would become shorter.
[0093] As shown in FIG. 7, the bottom of the heat insulated container 3 is provided with
a discharge port 23 for discharging the inside liquid. By discharging the inside liquid
raised in temperature and inserting new liquid of a low temperature each time the
oven walls finish being viewed, it is possible to prevent a rise in temperature of
the liquid. If continuing to discharge the liquid from the discharge port 23 while
supplying cooled liquid from the filling port 24 at the time of filling the new liquid,
it is also possible to reduce the temperature of the heat insulated container itself.
As a result, it is possible to secure a sufficient residence time in the oven for
each measurement.
[0094] When arranging a wireless transmitter 18 in the heat insulated container, further,
as shown in FIG. 8, it is possible to install a thermometer 36 for measuring the temperature
of the heat insulated container or the temperature of the liquid in the jacket inside
the heat insulated container and to transmit the measured temperature to outside of
the oven by the wireless transmitter 18.
[0095] Due to this, it is possible to obtain a grasp of the temperature of the oven wall
viewing apparatus at the present point of time outside of the furnace. When the temperature
approaches the upper limit of management, it is possible to suspend the measurement
and take the oven wall viewing apparatus outside of the oven so as to prevent in advance
damage to the oven wall viewing apparatus due to the abnormally high temperatures.
[0096] The viewing apparatus of the present invention may set viewing positions in the oven
in advance and capture images of the oven wall at those positions as still images.
Due to this, it is possible to obtain images of the states of oven wall positions
where damage is predicted as occurring in advance.
[0097] On the other hand, it is more preferable to capture images while moving the camera
apparatus 8 in the depth direction of the oven and record the capture data in a data
recorder 22 as with the viewing apparatus of the present invention of the above (8).
[0098] The camera apparatus 8 is moved in the depth direction of the oven by for example
as shown in FIG. 3 mounting the oven wall viewing apparatus 1 housing the camera apparatus
8 on the coke pusher 43 of the coking chamber 41 of the coke oven and inserting the
coke pusher 43 into the oven or extracting it from the oven at a constant speed by
operation of a ram driver 46.
[0099] It is possible to move the camera apparatus 8 while continuously capturing images
and view the capture results as a moving image.
[0100] More preferably, as in the viewing apparatus of the present invention of (9), it
is possible to capture images while moving the camera apparatus 8 in the depth direction
of the oven and process and join the capture data recorded in the data recorder 22
so as to obtain a single still image of a broad range in the depth direction of the
oven.
[0101] For example, when the speed of movement of the coke pusher is 300 mm/sec. and the
still image capture interval of the camera apparatus is 1/30 second, the camera apparatus
moves 10 mm from the capture of one still image to the capture of the next still image.
[0102] Therefore, by making the capture range of one still image in the width direction
(depth direction of oven) 10 mm and stitching successively captured still images,
it is possible to obtain a single still image of the connected images of the oven
wall surface over the entire length of movement of the coke pusher.
[0103] Alternatively, it is possible to make the capture range in the width direction 100
mm and capture images at a still image capture interval of 1/3 second. FIG. 10 shows
an oven wall picture obtained by joining eight adjoining still images at the image
joining positions 15 to prepare an image 14 of a broad region. This data processing
can be performed at the data recorder 22.
[0104] In a viewing apparatus of the present invention arranging a wireless transmitter
18 in the heat insulated container, transmitting the capture information from the
heat insulated container to a wireless receiver 21 outside, recording this data in
an outside data recorder 22, and simultaneously recording the oven position information
of the camera apparatus (capture current position data 35 in the horizontal direction
in the oven) in a data recorder 22, it is possible to capture images while moving
the camera apparatus 8 in the depth direction of the oven and select still images
based on oven position information.
[0105] The case of taking still images at a pitch of 100 mm in the width direction and stitching
these still images to prepare an oven wall image of a broad range in the depth direction
of the oven will be explained as an example.
[0106] The captured still images are successively transmitted to an outside data recorder
at a pitch of 1/30 second. The data recorder 22 outside of the oven selects the still
images received at the time each time the camera apparatus reaches a 100 mm pitch
still image taking position based on the oven position information.
[0107] Due to this, as a result, by taking still images at a pitch of 100 mm in the width
direction and stitching together these still images, it is possible to prepare an
oven wall image extending over a broad range in the depth direction of the oven. With
this method, even if the running speed of the coke pusher mounting the heat insulated
container fluctuates, it is possible to acquire still images at equal intervals.
[0108] When arranging a wireless receiver in the heat insulated container and transmitting
oven position information from outside the oven to the heat insulated container, it
is sufficient to process the data in the same way as above in the heat insulated container.
[0109] Further, if arranging a wireless receiver enabling communication with the inside
of the heat insulated container and the outside of the oven, it is also possible to
transmit oven position information from outside the furnace to the heat insulated
container, select still images every constant interval in the heat insulated container,
and wirelessly transmit only the selected still images outside of the oven.
[0110] In a viewing apparatus of the present invention capturing images while moving the
camera apparatus 8 in the depth direction of the oven to take still images and stitching
together these still images to prepare an oven wall image extending over a broad range
in the depth direction of the oven, it is also possible to capture images so that
overlapping parts occur between adjoining still images.
[0111] For example, by capturing images at a pitch of about 100 mm in the width direction
and making the size of the still images in the width direction 150 mm, 50 mm overlapping
parts will occur. The overlapping parts capture the same parts of the oven wall, so
it is possible to accurately position and align two images by pattern matching based
on the images of the oven walls.
[0112] If using this technique, even if there is some deviation in the oven position information
of the still images, it is possible to automatically correct this deviation and prepare
an accurate oven wall image of a broad range in the depth direction of the oven.
[0113] Further, even when it is not possible to use oven position information, it is possible
to determine the overlap of the images by pattern matching for a group of images taken
in time series with overlapping portions between adjacent images and successively
connect them to prepare an accurate oven wall image.
[0114] For example, when viewing the coking chamber of the coke oven, since the oven walls
are high in temperature, they emit light. It is possible to view the oven walls by
capturing this thermal radiation light by a camera apparatus.
[0115] Further, when using an ordinary CCD camera as a camera apparatus, it is possible
to capture images at a shutter speed of about 1/1000 second. With this fast a shutter
speed, even with a speed of movement of the coke pusher of 300 mm/sec., it is possible
to obtain a sharp image free from blurring.
[0116] By moving the camera apparatus together with the moving apparatus in the depth direction
of the oven in this way, it is possible to fit the entire length of the oven wall
surface in a single still image.
[0117] On the other hand, in the height direction of the oven, while depending on the distance
between the mirror surface and camera apparatus, ordinarily the capture range is a
range of about 500 to 600 mm. Therefore, in the height direction of the oven, the
range which can be captured at one time is limited.
[0118] On the other hand, for example, in the coking chamber of the coke oven, the parts
of the oven wall refractories where damage is particularly severe are for example
limited to the vicinity of the coal charging line in the oven height direction etc..
[0119] Therefore, by setting the viewing apparatus of the present invention at a position
enabling the vicinity of the coal charging line to be viewed, even if the range of
viewing in the oven height direction is limited, it is possible to obtain sufficiently
useful data. Of course, by providing a plurality of oven wall viewing apparatuses
in the height direction at the coke pusher, it becomes possible to view the oven wall
over a broad range in the oven height direction.
[0120] The viewing apparatus of the present invention is compact in shape, light in weight,
and does not require the provision of cooling pipes etc., so is easily changed to
any height of mounting to the pusher. Further, it is possible to make measurements
while changing the mounting position for each predetermined height to obtain oven
wall viewing data for the oven height as a whole.
[0121] In the viewing apparatus of the present invention, operating power cannot be supplied
from the outside during measurement, so a power supply 10 is provided inside the heat
insulated container. The camera apparatus 8, data recorder 22, and wireless transmitter
18 operate by power supplied from this power supply 10. As the power supply 10, it
is possible to use a dry cell, rechargeable storage cell, etc..
[0122] If using a cell which cannot be recharged as the power supply 10, it is necessary
to open up the heat insulated container each time the cell is replaced. Further, even
if using a rechargeable power supply as a power supply 10, it becomes necessary to
open up the heat insulated container for each recharging if positioning the recharging
cable connection plug inside the heat insulated container.
[0123] As the power supply, a rechargeable power supply may be used. Further, as shown in
FIG. 7, by providing a recharging cable connection plug 25 at the outside of the heat
insulated container 25, it becomes possible to recharge without opening the heat insulated
container and therefore improve the work efficiency.
[0124] The recharging cable connection plug 25 may be covered at its outside by a heat insulating
cap 34 when inserted into the oven. Only the heat insulating cap 34 need be removed
at the time of recharging and the recharging cable connected.
[0125] Here, examples of the viewing apparatus of the present invention will be shown.
(EXAMPLES)
[0126] The oven wall viewing apparatus shown in FIG. 1 was used for the purpose of viewing
the surface of the oven walls of the coking chamber of the coke oven. The external
dimensions of the oven wall viewing apparatus 1 are a height of 500 mm, width of 300
mm, and length of 500 mm and the total weight about 50 kg.
[0127] As the heat insulated container 3 of the oven wall viewing apparatus, one covered
over its outer circumference with ceramic fiber board as a heat insulating material
4 was used. The thickness of the heat insulating material was made 30 mm. At the inside
of the heat insulating material, a jacket made of stainless steel was arranged. The
jacket was filled with a total of 30 liters of water 7. At the portion of the heat
insulating container 3 facing the oven wall, the thickness of the layer of water was
40 mm.
[0128] Inside of the heat insulated container was arranged a CCD camera as the camera apparatus
8. The image signal captured by the camera apparatus was transmitted outside of the
oven by the wireless transmitter 18. The heat insulated container and the heat insulating
material were provided with a viewing window 16 and a communication window 17. The
viewing window was fit with metal-evaporated quartz glass. Further, a rechargeable
storage cell was provided as a power supply 10 and used to supply power to the camera
apparatus, wireless transmitter, and controller for controlling the same.
[0129] In front of the heat insulated container, as shown in FIG. 1, mirror surfaces 2a
and 2b were arranged. The longitudinal direction of the mirror surfaces was made the
height direction of the oven. The two mirror surfaces 2a and 2b were set to angles
with the oven wall 42 of 45°. The left and right oven walls 42a and 42b can be simultaneously
captured in the field of vision of the camera apparatus 8. By arranging the mirror
surfaces, the fields of vision 13a and 13b of the camera apparatus have lengths on
the long sides of 600 mm and lengths of the short sides of 200 mm for each of the
left and right oven walls.
[0130] For the mirror surfaces, use was made of the surface of the stainless steel container
11 containing cooling water 6 inside polished to a mirror finish. The container 11,
as shown in FIG. 2, has a long rectangular cross-sectional shape with two of its four
outer surfaces made mirror surfaces and the remaining two surfaces made heat insulating
by a heat insulating material 12.
[0131] The oven wall viewing apparatus and mirror surfaces were attached to the pusher 43.
The total weight of the oven wall viewing apparatus is a comparatively light one of
approximately 50 kg. Further, since there is no need for arranging cooling water pipes
or signal cables, it is possible to easily attach the components to any positions
in the height direction of the pusher ram 44.
[0132] In the present example, as shown in FIG. 3, these components are either attached
to positions of the oven wall viewing apparatus 1 behind the pusher ram 44 using a
support 45 or attached to positions of the oven wall viewing apparatus 1' on a ram
beam 47. By successively viewing the oven wall at different heights in this way, it
was possible to obtain oven wall viewing data over a broad range.
[0133] For the wireless communication, wireless communication using the electromagnetic
waves of a digital signal was adopted. The output of the camera apparatus and the
output of the thermometer 36 for measuring the temperature inside the measurement
unit are converted to a digital signal by the A/D converter 26 and sent to the digital
signal wireless transmitter 27. The digital signal wireless transmitter 27 functions
as a wireless transmitter 18 and sends a wireless signal 19 to a wireless receiver
21 outside of the oven.
[0134] In the heat insulated container, the part through which the electromagnetic wave
passes is provided with a communication window 17 equipped with quartz glass coated
with silica. This silica coating blocks the radiation heat from the oven and does
not obstruct the propagation of the electromagnetic waves since it is not a metal
coating.
[0135] Outside of the furnace, a digital signal wireless receiver 28 is arranged as a wireless
receiver 21, while a processor 30 and image display 31 are arranged as a data recorder
22. The digital signal received by the digital signal wireless receiver 28 is transmitted
to the D/A converter 29 and processor 30.
[0136] The data sent to the processor 30 is recorded in the computer. The capture signal
is processed to easily analyzable image information. The analog signal output from
the D/A converter 29 is sent to the image display 31.
[0137] The data recorder 22 is sent the capture current position data 35 found based on
the current position data of the pusher ram 44, so this data is also sent to the processor
30 and image display 31.
[0138] In the image display 31, the capture information captured at different times can
be arranged based on the capture current position data 35 to produce a single still
image extending over the entire length in the depth direction of the coking chamber
and to identify locations of oven wall damage.
[0139] Specifically, along with movement of the pusher 43, each time the capture current
position data 35 is increased by 150 mm, the transmitted still image is fetched into
the processor 30. Since the length of the still image in the oven width direction
(short side) is 200 mm, adjoining images have 50 mm overlapping parts.
[0140] It is possible to use the overlapping parts for pattern matching and finely adjust
the overlap of the images. In this way, it is possible to produce a single still image
extending over the entire length in the depth direction of the coking chamber.
[0141] One example of the results of viewing of the oven walls is shown in FIG. 9. FIG.
9(a) shows an image of the oven wall 42a reflected in the mirror surface 2a and an
image of the oven wall 42b reflected in the mirror surface 2b in the overall field
of vision 9 of the camera apparatus. In both images, the joint 49 of the bricks 48
is clearly discriminated.
[0142] FIG. 9(b) shows the image of a location of the oven wall where damage occurred. A
joint gap 50 is viewed other than the normal joint 49. Further, a vertical crack 51
was viewed in the oven wall. In the image shown in (c) in FIG. 9, a carbon deposit
52 of the oven wall can also be viewed.
[0143] By combining still images obtained continuously along with movement of the pusher
43, it is possible to obtain an oven wall image over a broad region in the depth direction
of the oven.
[0144] FIG. 10 shows an oven wall picture obtained by combining eight adjoining still images
at the image joining positions 15 to obtain an image 14 of a broad region. In an image
of a broad region, identification of damaged locations is easy. Further, it is possible
to obtain a grasp of the overall state of damage at a single glance. Therefore, this
is useful in diagnosis and management of ovens.
[0145] During measurement, the data recorder 22 was successively sent data, so there was
no need to open the heat insulated container after measurement was completed and the
work efficiency of the measurement could be greatly improved. Further, it was possible
to catch oven wall damage during measurement in real time and accurately identify
even locations of occurrence of that damage, so it was possible to propose repair
plans of the coking chamber without delay.
[0146] After the oven wall of one coking chamber finishes being viewed, before viewing the
oven wall of the next coking chamber, the discharge port 23 at the bottom of the heat
insulated container was opened and the raised temperature cooling water 7 discharged
and, simultaneously, ordinary temperature water was filled from the top filling port
24. 15 liters of water was filled to lower the temperature of the heat insulated container
3, then the discharge port 23 at the bottom of the heat insulated container was closed
and water filled in the heat insulated container.
[0147] In this way, the next measurement was performed after sufficiently lowering the temperature
of the heat insulated container and the water in the heat insulated container, so
it was possible to secure a measurement time of more than 5 minutes at a time even
when continuously viewing oven walls of coking chambers.
[0148] The rechargeable storage cell used as the power supply 10 in the measurement unit
has a capacity enabling continuous measurement of the oven width of 10 coking chambers.
At the time of recharging, it is possible to recharge by connecting a recharging cable
to the recharging cable connection plug 25 arranged at the outside of the heat insulated
container, so the heat insulated container does not have to be opened for recharging
and recharging was possible with a good work efficiency.
[0149] (2) Next, an oven wall shape measurement apparatus of the present invention (hereinafter
sometimes referred to as the "measurement apparatus of the present invention") will
be explained based on FIG. 3, FIG. 8, and FIG. 11 to FIG. 23.
[0150] As shown in FIG. 11, the oven wall shape measurement apparatus 61 of the present
invention houses inside it light beam emitters 62a and 62b and a camera apparatus
8. The oven wall shape measurement apparatus 61 is arranged close to the oven walls
42a and 42b. When inserting the oven wall shape measurement apparatus 61 inside the
coking chamber of a coke oven, the distance between the facing oven walls (42a and
42b) is narrow, so the apparatus is inserted at the center of the width of the coking
chamber and arranged in proximity to the two oven walls.
[0151] The light beam emitters 62a and 62b emit light beams 63a and 63b to the oven walls
42a and 42b from a slanted direction. In FIG. 11, they emit the light beams at an
angle θ. The parts of the oven wall surface at which the light beams are emitted reflect
the light beams and emit light forming the beam spots 64a and 64b.
[0152] The camera apparatus 8 is arranged for the purpose of capturing the oven wall surface
including the light beam reflected light from a direction vertical to the oven wall
as much as possible. As the camera apparatus 8, it is possible to use a CCD camera,
a camera controller for controlling the same, etc.. The direction of the field of
vision of the camera apparatus 8 may be made parallel to the oven walls 42a and 42b
as shown in FIG. 11 and FIG. 12.
[0153] Further, the mirror surface is arranged in the direction of the field of vision of
the camera apparatus 8. The angle of the mirror surface is adjusted so that the image
of the oven wall surface is reflected at the mirror surface when viewed from the position
of the camera apparatus 8.
[0154] Normally, as shown in FIG. 11, if making the angle of the mirror surfaces 2a and
2b and the oven walls 42a and 42b 45°, it is possible to obtain an image as seen from
a direction vertical to the oven wall surface. Of course, when the view of the oven
wall from a slanted direction enables clear viewing of the relief of the oven wall
surface, it is also possible to make the angle between the mirror surface and oven
wall an angle other than 45°.
[0155] During measurement of the shape in the oven, normally the distance between the camera
apparatus and the mirror surface is made constant. The longer the distance between
the camera apparatus and the mirror surface, the longer the effective mirror surface
length in the direction parallel to the oven wall can be made and the broader the
range of the field of vision 13 of the camera apparatus (length of long side) viewing
the mirror surface can be made.
[0156] On the other hand, since the distance between oven walls is narrow, the effective
mirror surface width in the direction vertical to the oven walls, that is, the width
direction, cannot be enlarged and the range of the field of vision 13 of the camera
apparatus (length of short side) cannot be broadened.
[0157] In viewing of the coking chamber of a coke oven, if the length of the long side of
the field of vision 13 of the camera apparatus at the oven wall surface is made 500
to 600 mm or so, viewing at a spatial resolution of about 1 mm sufficient for detection
of damage is possible by a general CCD camera. The length of the short side of the
field of vision 13 of the camera apparatus at the oven wall surface becomes 150 to
200 mm when viewing the oven wall from a vertical direction.
[0158] As shown in FIG. 13, the light beam 63 is emitted from the light beam emitter 62
to the oven wall surface 66b from a slanted direction. In FIG. 13, it is emitted at
an angle θ. Therefore, if the distance between the oven wall shape measurement apparatus
61 (light beam emitter 62) and the oven wall changes by exactly Δx, the position of
the point where the light beam 63 and the oven wall surface 66b intersect (light beam
spot) changes from 64a to 64b and the position of the light beam reflected light changes
by exactly Δy.
[0159] The camera apparatus 8 captures an image of the oven wall surface 66 including the
light beam reflected light, so a change in the distance between the oven wall shape
measurement apparatus 61 and the oven wall 42, that is, deformation of the oven wall,
can be deemed as a change of the position of the light beam reflected light in the
captured image.
[0160] Therefore, it is possible to evaluate the state of a broad two-dimensional range
of the oven wall by an image obtained by the camera apparatus 8 and possible to quantitatively
evaluate the state of damage at a specific location, that is, the light beam emitted
position.
[0161] The light beam 63 emitted from the light beam emitter 62 can be made a spot-like
light beam. Due to this, it is possible to evaluate the distance from the oven wall
shape measurement apparatus 61 for one spot of the oven wall.
[0162] On the other hand, the light beam 63 emitted from the light beam emitter 62, as shown
in FIG. 14(a) and (b), may be emitted so that the reflected light becomes a line of
light 65 when emitted to the oven wall. When using a spot light source such as laser
light as the light beam source, it is possible to arrange a cylindrical lens able
to enlarge the light spot in only a single axial direction and thereby form a light
beam generating such a line of light 65.
[0163] For example, when there is a groove-shaped damaged location 67 in the oven wall surface
66 as shown in FIG. 14(c), if emitting the light beam 63 to the oven wall surface
66 to generate the line of light 65, it is possible to view the drift 68 in the line
of light 65 as shown in FIG. 14(b) corresponding to the damaged location 67.
[0164] If the depth of the damaged location 67 is Δx, the magnitude Δy of the drift 68 becomes
Δy = Δx/tanθ. Due to this, it becomes possible to obtain a quantitative grasp of the
relief of the surface at the straight line part where the line of reflected light
is generated.
[0165] When inserting the oven wall shape measurement apparatus 61 into the coking chamber
41 of the deep coke oven from one end, it is difficult to maintain the distance between
the oven wall shape measurement apparatus 61 and oven wall surface (oven wall reference
surface) 66 constant at all times. Here, the "oven wall reference surface" means the
reference surface when the oven wall surface 66 is not damaged and may be considered
the oven wall surface with zero oven wall damage.
Therefore, when making the light beam 63 a spot beam, the distance between the oven
wall surface 66 at the light beam spot 64 reflected and the oven wall shape measurement
apparatus 61 can be identified, but the absolute value of the oven wall damage is
difficult to identify.
[0166] On the other hand, which parts of the oven wall surface 66 are sound and which parts
are damaged can be generally determined by viewing the images captured by the camera
apparatus 8.
[0167] The measurement apparatus of the present invention can simultaneously evaluate the
state of a broad two-dimensional range of the oven wall by the images and quantitatively
evaluate the state of damage at a specific location, so when generating a line of
reflected light by emission of a light beam, sound parts and damaged parts of the
oven wall can both be included in the straight line part.
[0168] If conducting measurement in this way, it is possible to identify the relative relief
at the oven wall surface in the range of the line of light 65. Therefore, in the measurement
apparatus of the present invention, even if it is not possible to identify the distance
between the oven wall shape measurement apparatus 61 and the oven wall reference surface,
it is possible to identify the difference in relative depth between the sound parts
and the damaged parts and identify the damage at the damaged parts.
[0169] The plane including the light beam 63 striking the oven wall and generating the line
of light 65 will be referred to as the "light beam plane" here. The position of the
line of light 65 naturally matches with the line where the light beam plane and oven
wall surface 66 intersect.
[0170] Further, as shown in FIG. 14(b) and (c), when making the spot beam at the center
of the width direction of the beam in the light beam 63 generating the line of light
65 the center beam 69, the plane including the center beam 69 vertical to the oven
wall surface 66 will be referred to here as the "center beam vertical plane".
[0171] When the light beam plane and the center beam vertical plane are parallel, that is,
match, even if there is relief at the oven wall surface 66, the reflected light will
remain straight and even if viewing the reflected light, the damage of the oven wall
cannot be evaluated.
[0172] When the light beam plane and the center beam vertical plane are orthogonal to each
other, it is possible to detect the change in position of the line of light 65, that
is, the drift 68, most efficiently. In the example shown in FIG. 14(b) and (c), the
light beam plane and the center beam vertical plane are orthogonal to each other.
[0173] The line where the plane formed by the oven wall and the plane formed by the mirror
surface intersect will be referred to here as the "intersecting line 70". In the example
shown in FIG. 12(b), the intersecting line 70 becomes a line in the vertical direction.
[0174] Consider the case, as shown in FIG. 12(a), where the light beam emitters 62a and
62b are arranged in proximity to the camera apparatus 8 and the light beams 63a and
63b are not reflected at the mirror surfaces 2a and 2b, but are emitted directly to
the oven wall surface 66.
[0175] In this case, if the direction of the line of light 65 ends up perpendicularly intersecting
the intersecting line 70, this will correspond to the case where the light beam plane
and center beam vertical plane become parallel and evaluation of the damage of the
oven wall will become impossible.
[0176] To enable the relief to be efficiently detected, that is, to enable the light beam
plane and center beam vertical plane to become orthogonal to each other, similarly,
as shown in FIG. 12(a), it is possible to make the direction of the line of light
65 emitted to the oven wall substantially parallel to the intersecting line 70 of
the oven wall and mirror surface.
[0177] Next, consider the case, as shown in FIG. 15(a) and (b), of reflecting the light
beam 63 from the light beam emitter 62 at the mirror surface 2b and emitting it to
the oven wall surface 66. To emit the light beam to the oven wall surface 66 from
in a slanted direction by reflecting it at the mirror surface 2b, as shown in FIG.
15(a), the light beam emitter 62 and the camera apparatus 8 have to be arranged separate
from each other.
[0178] The direction of separation is the direction parallel to the intersecting line of
the wall surface and the mirror surface. At this time, if viewing the light beam emitter
62 reflected at the mirror surface 2b from the position of the oven wall surface 66,
the light beam emitter 62 appears at the position of 62a at FIG. 15(a). If the direction
of the line of light 65 ends up becoming parallel to the intersecting line 70 by such
an arrangement, this corresponds to the case where the light beam plane and center
beam vertical plane become parallel and evaluation of the damage of the oven wall
becomes impossible.
[0179] To enable the relief to be efficiently detected, that is, to enable the light beam
plane and center beam vertical plane to become orthogonal to each other, as shown
in FIG. 15(a), it is possible to make the direction of the line of light 65 emitted
to the oven wall substantially perpendicularly intersect the intersecting line 70
of the oven wall and mirror surface.
[0180] As the light beam emitter 62, it is preferable to use a laser light emitter (laser
light source). This is because if a laser light source, it is possible to generate
a fine spot of light and powerful light beam. To emit light to the oven wall and make
a light beam giving a line of reflected light, it is possible to use a cylindrical
lens etc. and enlarge the light spot in only one axial direction. The angle of spread,
that is, the length of the line of reflected light at the oven wall surface, is determined
by the focal distance of the cylindrical lens.
[0181] Inside the high temperature coking chamber, the oven wall surface 66 emits thermal
radiation light in the red region. In particular, the carbon deposits 52 burn and
become high in temperature so feature a strong intensity of emission of red light.
If the wavelength of the laser light is in the red region, the light is overcome by
the thermal radiation light of the oven wall surface and detection of the light beam
reflected light becomes difficult.
[0182] As a small-sized laser light source able to be mounted in the heat insulated container,
a red laser diode of a wavelength of 633 nm or 670 nm has conventionally been used.
This is a wavelength region common with the thermal radiation light of the oven wall
surface 66. In a high temperature region such as a carbon deposit 52, sometimes the
light beam reflected light cannot be sufficiently detected.
[0183] In the measurement apparatus of the present invention, the light beam emitter 62
is preferably made a laser light beam apparatus emitting light of a wavelength of
not more than 550 nm and the camera apparatus 8 is made a color camera apparatus.
If the wavelength is made not more than 550 nm, since it is different from the strong
wavelength region of the thermal radiation light of the oven wall surface 66, the
line of light is displayed emphasized at the captured color image.
[0184] Further, by emphasizing and taking out the component of a wavelength of not more
than 550 nm from the captured image by image processing, it is possible to make the
line of light 65 clearer.
[0185] In the measurement apparatus of the present invention, when capturing an image due
to thermal radiation light of the high temperature oven wall, the intensity of the
thermal radiation light fluctuates depending on the temperature of the oven wall.
If the temperature of the oven wall is high, the luminance of the oven wall due to
the thermal radiation light is high, while if the temperature of the oven wall is
low, the luminance of the oven wall becomes low. In particular, parts of carbon deposits
become high in temperature due to the burning of the carbon, so the luminance of those
parts becomes high.
[0186] In the camera apparatus 8, it is possible to adjust the aperture of the optical system
or adjust the exposure time in accordance with the luminance of the oven wall surface
and thereby obtain an optimal image of the oven wall surface. Normally, it is possible
to automatically obtain the optimal image by the exposure control function of the
camera apparatus 8.
[0187] On the other hand, if the intensity of the light beam 63 emitted by the light beam
emitter 62 is constant, if the temperature of the oven wall is remarkably high, the
thermal radiation light of the oven wall surface becomes higher in luminance than
the light beam reflected light. The exposure of the camera apparatus 8 is determined
by the luminance of the oven wall surface 66. Therefore, the light beam reflected
light becomes relatively dark. It is not possible to obtain a sufficient grasp of
this or not possible to identify the position of the light beam reflected light.
[0188] Conversely, if the temperature of the oven wall is low, the exposure of the camera
apparatus is adjusted in accordance with the low luminance of the thermal radiation
light of the oven wall surface, so the light beam reflected light becomes too strong,
halation occurs, and the position of the light beam reflected light cannot be accurately
identified.
[0189] The measurement apparatus of the present invention has a means for measuring the
intensity of the thermal radiation light of the oven wall surface emitting the light
beam, so it is possible to adjust the intensity of the light beam 63 emitted from
the light beam emitter 62 in accordance with the intensity of the thermal radiation
light measured and thereby solve this problem.
[0190] When the intensity of the thermal radiation light of the oven wall surface is high,
the intensity of the light beam 63 is strong and it becomes possible to obtain an
accurate grasp of the position of the light beam reflected light. Further, when the
intensity of the thermal radiation light of the oven wall surface is low, it is possible
to weaken the intensity of the light beam 63 to prevent halation of the light beam
reflected light.
[0191] Power is supplied to the light beam emitter 62 from the power supply 10 housed in
the heat insulated container. To increase the period of use from one recharging of
the power supply 10 to the next, it is preferable that the power consumption of the
light beam emitter 62 be as small as possible.
[0192] If adjusting the intensity of the light beam in accordance with the intensity of
the thermal radiation light of the oven wall as in the measurement apparatus of the
present invention, it is possible to reduce the power consumption of the light beam
emitter 62.
[0193] In measurement of the intensity of the thermal radiation light of the oven wall surface,
it is possible to use the results of evaluation of the exposure control function of
the camera apparatus 8 as they are. Alternatively, as shown in FIG. 23, it is also
possible to provide a photometer 71 as a means for measuring the amount of light separate
from the camera apparatus 8. Further, it is also possible to measure the temperature
of the oven wall surface 66 and estimate the intensity of the thermal radiation light
from the temperature based on Plank's blackbody radiation law.
[0194] Since the measurement apparatus of the present invention moves inside the oven, it
is preferable to use a radiation thermometer as a temperature measuring means. Further,
in measuring the intensity of the thermal radiation light, it is also possible to
measure the average intensity of light of the total wavelength of the visible light,
but it is also possible to take out and measure only the light intensity of the wavelength
region centered on the wavelength of the light beam emitted.
[0195] When measuring the intensity of the thermal radiation light, it is also possible
to measure the average light intensity at the field of vision 13 of the camera apparatus
captured at the camera apparatus 8. Further, it is also possible to measure the intensity
of light limited to the region emitting the light beam in the field of vision 13 of
the camera apparatus.
[0196] In the measurement apparatus of the present invention, it is possible to evaluate
the relief of the oven wall surface quantitatively for a straight line part of the
oven wall and possible to obtain a grasp of the two-dimensional state of the oven
wall as a whole including the straight line part as an image. As a result, when data
arising due to a bulge occurring at the oven wall surface is obtained, it is possible
to clearly differentiate whether that bulge is due to deformation of the brick wall
surface itself or due to carbon deposition based on the image.
[0197] Therefore, it becomes possible to propose an accurate repair plan based on the results
of shape measurement. Specifically, with carbon deposition, air is blown in to burn
away the carbon, while with deformation of the wall surface itself, a large-scale
repair plan is proposed.
[0198] As the direction of arrangement of the mirror surface, as shown in FIG. 12(b), it
is sufficient to make the intersecting line 70 of the oven wall and the mirror surface
the height direction of the furnace, that is, a direction orthogonal to the depth
direction of the oven. The depth direction of the oven is the direction of movement
of the oven wall shape measurement apparatus 61 while viewing the oven walls 42a and
42b. By viewing the surface while moving, it is possible to store the results of measurement
of the oven wall shape in the depth direction of the oven.
[0199] Therefore, by making the intersecting line of the oven wall and the mirror surface
a direction orthogonal to the depth direction of the oven (movement direction), it
is possible to obtain the maximum capture information of the oven wall surface.
[0200] In the measurement apparatus of the present invention, as shown in FIG. 11 and FIG.
16 to FIG. 18, the electronic equipment such as the light beam emitter 62 and camera
apparatus 8 is housed in the heat insulated container 3 and the mirror surface 2 or
2a and 2b are arranged at the outside of the heat insulated container 3. The heat
insulated container 3 is not supplied with cooling water from outside of the furnace
and does not have any power lines or signal wires connected to it.
[0201] Therefore, it is possible to make the oven wall shape measurement apparatus 61 set
in the oven light in weight and compact in size and possible to easily attach it to
and detach it from a structure inserted and moving in the oven, for example, the coke
pusher 43 of the coking chamber 41 of the coke oven (see FIG. 3).
[0202] As shown in FIG. 16 and FIG. 17, the heat insulated container 3 is covered on its
surface by the heat insulating material 4, so if a short time, it is possible to operate
the electronic equipment inside the container normally while residing in the high
temperature furnace.
[0203] The heat insulated container 3 can remain inside the coking chamber 41 of the coke
oven for 3 minutes, so it is possible to secure the minimum amount of time for insertion
of the coke pusher 43 mounted with the oven wall shape measurement apparatus 61 into
the oven, viewing of the oven wall over the entire length in the depth direction of
the oven, and extraction to the outside.
[0204] As the heat insulating material 4 covering the heat insulated container 3, it is
possible for example to use a ceramic fiber board, calcium silicate board, etc..
[0205] In the measurement apparatus of the present invention, the mirror surface 2 or 2a
and 2b are arranged at the outside of the heat insulated container 3, so it is possible
to keep the viewing window 16 of the heat insulated container 3 for securing the field
of vision of the camera apparatus down to the minimum size.
[0206] In the prior art housing a prism in a box to try to secure a broad field of vision,
it is necessary to increase the size of the viewing window placed in the box. When
using a heat insulated container, there was the problem of the temperature inside
the container rapidly rising due to the radiation heat penetrating the container from
the viewing window, but by arranging the mirror surface at the outside of the heat
insulated container like in the measurement apparatus of the present invention, the
viewing window 16 can be made small, so the radiation heat entering from there can
be kept down to the minimum and a rise in temperature inside the heat insulated container
can be prevented.
[0207] The viewing window 16 is fit with quartz glass or other heat resistant glass. The
heat resistant glass preferably has the function of reflecting radiation heat from
the outside by a means such as vapor deposition of a metal.
[0208] In the measurement apparatus of the present invention, as shown in FIG. 16(a), it
is possible to use a single mirror surface and view one oven wall 42a. In this case,
the light beam emitter 62 also emits a light beam 63 to only one viewed oven wall
42a.
[0209] Further, as shown in FIG. 17, the heat insulated container is preferably provided
with a plurality of light beam emitters 62a and 62b, the light beams 63a and 63b are
emitted to the facing oven wall surfaces 66a and 66b, and the two mirror surfaces
2a and 2b with the different angles reflect surfaces including the light beam reflected
light of the facing oven walls 42a and 42b.
[0210] In the example shown in FIG. 12 and FIG. 17, the first mirror surface 2a reflects
the surface of the first wall surface 42a, the second mirror surface 2b reflects the
surface of the second wall surface 42b, and the two are simultaneously captured by
a single camera apparatus 8.
[0211] Due to this, by using the oven wall shape measurement apparatus 61 housing the single
camera apparatus 8 and the two light beam emitters 62a and 62b and moving it once
in the depth direction of the oven, it is possible to measure the shape of the oven
wall surface at the left and right sides.
[0212] Further, by this movement, it becomes possible to simultaneously compare the left
and right oven walls. Further, since it is possible to view the left and right oven
walls by a single camera apparatus 8, it is possible to reduce the open area of the
viewing window 16 of the heat insulated container compared with when housing two camera
apparatuses inside a heat insulated container. The ratio of the radiation heat penetrating
the inside of the heat insulated container and raising the temperature becomes smaller.
[0213] when mounting the oven wall shape measurement apparatus on a pusher of the coke oven
etc. and inserting it into the coking chamber of the coke oven from one end for measurement
of the inside of the coking chamber, it is difficult to accurately arrange the oven
wall shape measurement apparatus at the center of the oven wall reference surfaces
of the two sides. Deviation from the center occurs.
[0214] Therefore, when emitting a light beam to only one oven wall, it is difficult to obtain
an absolute value showing how much the actual oven wall surface is damaged from the
oven wall reference surface.
[0215] In the measurement apparatus of the present invention for simultaneously measuring
the oven wall surface shapes at the left and right by two light beam emitters and
two mirror surfaces, it is possible to simultaneously measure the distance between
the oven wall shape measurement apparatus and the measurement portions of the oven
wall surface at the left and right sides. It is possible to calculate the distance
between the measurement portions of the oven wall surface at the left and right sides
from these measured values.
[0216] Since the distance between the oven walls at the initial stage where no damage has
occurred is known, the total damage of the left and right sides can be calculated
based on this measured value. At the very least, if the viewed portions at the left
and right are sound portions where no local damage is viewed, since it may be considered
that the damage will proceed evenly at the left and right, half of the total damage
measured can be evaluated as the damage of the oven wall at each sound portion.
[0217] By viewing the line of light 65, it is possible to detect the difference in the relative
damage between sound parts and local damaged parts in the range of generation of the
line of light and, as explained above, possible to evaluate the oven wall damage at
the sound portions, so it becomes possible to estimate even the absolute value of
the damage of local damaged parts.
[0218] In the measurement apparatus of the present invention, the mirror surface is arranged
at the outside of the heat insulated container 3, so the mirror surface is directly
exposed to the high temperature atmosphere inside the oven. In the measurement apparatus
of the present invention, as shown in FIG. 17, the surface of the container 11 containing
cooling water 6 inside is made the mirror surfaces 2a and 2b.
[0219] The time when the measurement apparatus 61 of the present invention resides in the
high temperature oven is short. If within this time, the cooling water 6 inside the
container 11 rises in temperature and boils to cool the container 11 by boiling and
maintains the temperature of the container 11 at the boiling point of the cooling
water (100°C). The optical performance of the mirror surfaces 2 and 2b formed at the
container surface can be maintained over a long time and the flatness of the mirror
surfaces 2 and 2b can similarly be maintained over a long time.
[0220] In the measurement apparatus of the present invention, it is not necessary to supply
cooling water from outside of the furnace to cool the mirror surfaces 2a and 2b. Further,
it is also not necessary to use a preheater for preheating the mirror surface. Therefore,
it is possible to easily attach the apparatus to the coke pusher or other moving apparatus.
[0221] The container 11 containing cooling water 6 inside it, as shown in FIG. 12 and FIG.
17, may be made a long rectangular cross-section shape with two of its four outer
surfaces made mirror surfaces and the remaining two surfaces made heat insulating
by a heat insulating material 12 in accordance with need.
[0222] It is possible to make the container 11 itself out of stainless steel and polish
the two surfaces to be made mirror surfaces to a mirror finish. Further, it is possible
to make the container 11 itself out of stainless steel and polish its surface to a
mirror finish.
[0223] The image captured by the camera apparatus 8 in the heat insulated container has
to be recorded in a data recorder 22 and the finally recorded data used to prepare
image information of the oven walls. The data recorder 22 may be housed inside the
heat insulated container (see FIGS. 16 and 17).
[0224] On the other hand, it is more preferable to house a wireless transmitter 18 inside
the heat insulated container and arrange the wireless receiver 21 and data recorder
22 outside of the oven (see FIGS. 3 and 18).
[0225] The information captured by the camera apparatus 8 is transmitted from the wireless
transmitter 18 to the wireless receiver 21 arranged outside of the oven and recorded
in the data recorder 22. If designing the data recorder 22 so as to input the information
in a recording computer or other processor 30 and simultaneously display the capture
image at an image display 31, it is possible to confirm the viewing results at the
same time as inserting the oven wall shape measurement apparatus inside the oven for
viewing.
[0226] The heat insulated container returned from the 1000°C oven is high in temperature
at the outside, so the inside data cannot be taken out until after the elapse of a
certain time. As opposed to this, if employing the above transmission and reception
system, the trouble of taking out the oven wall shape measurement apparatus 61 from
the oven, then waiting until the apparatus cools before taking out the image data
is not required, so it is possible to quickly confirm the state of the oven walls.
Further, it is possible to immediately use the oven wall shape measurement apparatus
61 taken out from the coking chamber for viewing of the next coking chamber.
[0227] For the wireless communication from the heat insulated container inside of the oven
to outside of the oven, it is possible to use wireless transmission using electromagnetic
waves or wireless transmission using visible light, infrared light, or other light.
[0228] For wireless communication, the wall of the heat insulated container facing the outside
of the oven is provided with a transfer use window 17. When the window 17 is fit with
heat resistant glass and electromagnetic waves are used as the communication medium,
a metal-evaporation coating is not used for the coating for preventing penetration
of radiation heat from the outside. A dielectric substance such as a silica coating
is coated.
[0229] As shown in FIG. 8, it is possible to use a digital wireless transmitter and receiver
(27 and 28) for transferring digital signals by electromagnetic waves for the wireless
communication. Since analog image signals are output from the camera apparatus 8,
the signal is converted to a digital signal by an A/D converter 26, the digital signal
is transmitted by a digital wireless transmitter 27, and that signal is received by
a digital wireless receiver 28 outside of the oven.
[0230] The received digital signal can be converted to an analog signal by a D/A converter
29 and output to an image display 31 or can be input as a digital signal to a processor
30 etc..
[0231] When arranging a wireless transmitter 18 inside the heat insulated container, the
capture information is transmitted from the heat insulated container to an outside
wireless receiver 21 and the data recorded in the outside data recorder 22. At that
time, it is possible to simultaneously record the oven position information of the
camera apparatus (capture current position data 35 in horizontal direction in oven)
together with the capture information in the data recorder 22.
[0232] The outside data recorder 22 is arranged outside of the oven, so it is possible to
calculate and fetch the capture current position data 35 of the camera apparatus 8
from the current position data of the pusher 43 mounting the camera apparatus 8.
[0233] As a result, in the outside data recorder 22, it becomes possible to establish correspondence
with the capture position in the horizontal direction and the capture data in real
time. During viewing, it is possible to identify the damaged locations in the oven
and locations requiring repair.
[0234] Conversely to the above, it is possible to provide a data recorder 22 and a wireless
receiver 21 inside the heat insulated container, wirelessly transmit the time of oven
insertion of the heat insulated container and the capture current position data 35
in the horizontal direction in the oven from the outside to the heat insulated container,
and simultaneously record the capture data and the capture current position data 35
in the horizontal direction of the oven to the data recorder 22 in the heat insulated
container.
[0235] For the wireless transmitter 18 and the wireless receiver 21, it is also possible
to use a transceiver provided with the functions of both transmission and reception.
[0236] The heat insulated container 3 preferably has a jacket 5 filled with a liquid 7 having
a heat absorbing ability and further a heat insulating material 4 covering the outside
as shown in FIG. 11 and FIG. 19.
[0237] In general, the liquid selected may be one having a large heat capacity per mass
and volume. As a liquid able to be most easily obtained industrially and optimal as
a heat absorbing material, it is preferable to use water.
[0238] When inserting the heat insulated container 3 in the high temperature oven, since
the outside of the heat insulated container is covered by the heat insulating material
4, it is possible to reduce the amount of heat penetrating the inside through the
heat insulating material 4.
[0239] Further, since there is a jacket 5 filled with a liquid 7 having a heat absorbing
ability inside the heat insulating material 4, the heat penetrating the inside first
is used up to raise the temperature of the liquid 7, for example, water. Water has
a large heat capacity, so it is possible to delay the rise in temperature inside the
heat insulated container.
[0240] Further, when the temperature of the water reaches 100°C, a large amount of the heat
of vaporization is robbed by the boiling, so the temperature inside the heat insulated
container will never exceed 100°C. To discharge the water vapor when the water reaches
100°C in temperature and starts boiling, an opening or a safety valve is provided
at the top of the heat insulated container 3.
[0241] The measurement apparatus of the present invention is characterized in that pipes
are not connected for supplying or discharging liquid during viewing of the oven walls
in the oven.
[0242] The width of the coking chamber 41 of the coke oven is usually about 400 mm. The
measurement apparatus of the present invention has to be made dimensions enabling
insertion into this space with some leeway. When using water as the heat absorbing
liquid, the jacket holding the water has a width of the water at the left and right
of about 40 mm in the oven width direction.
[0243] As the heat insulating material 4 at the outer circumference of the heat insulated
container, for example, it is possible to use a ceramic fiber board and make the thickness
of the heat insulating material 4 about 30 mm. When the external dimensions of the
oven wall viewing apparatus are made 500 mm length × 300 mm width × 500 mm height,
the internal space holding the oven wall viewing apparatus becomes 380 mm length ×
160 mm width × 300 mm height.
[0244] When inserting a measurement apparatus of the present invention having such a shape
into the coking chamber 41 of a coke oven of an oven temperature of 1000°C, the temperature
of the internal space housing the oven wall shape measurement apparatus becomes, along
with the elapsed time after insertion, 25°C after 3 minutes, 40°C after 5 minutes,
and 55°C after 7 minutes. The usual upper limit of the temperature used of the different
electronic equipment housed in the heat insulated container is about 50°C, so the
container can reside in the high temperature oven for at least 5 minutes.
[0245] In measurement of the shape of the oven wall of a coking chamber of a coke oven according
to the measurement apparatus of the present invention, when mounting the oven wall
shape measurement apparatus 61 of the present invention on the coke pusher 43 for
measurement, the car 40 of the pusher 43 continuously successively repeats the work
of pushing out the coke of the coking chamber finished being carbonized while moving
on rails at 5 to 10 minute intervals and simultaneously measures the shapes of the
oven walls of a large number of coking chambers.
[0246] Due to one insertion into a coking chamber, the liquid in the heat insulated container
rises in temperature, so if the container were inserted into the next coking chamber
for measurement as it were without any time interval, the temperature of the liquid
7 in the heat insulated container 3 would successively rise and the possible time
of residence in the oven would become shorter.
[0247] As shown in FIG. 19, the bottom of the heat insulated container 3 is provided with
a discharge port 23 for discharging the inside liquid. By discharging the inside liquid
raised in temperature and inserting new liquid of a low temperature each time the
shape of the oven wall finishes being measured, it is possible to prevent a rise in
temperature of the liquid.
[0248] If continuing to discharge the liquid from the discharge port 23 while supplying
cooled liquid from the filling port 24 at the time of filling the new liquid, it is
also possible to reduce the temperature of the heat insulated container itself. As
a result, it is possible to secure a sufficient residence time in the oven for each
measurement.
[0249] when arranging a wireless transmitter 18 in the heat insulated container, further,
as shown in FIG. 8, it is possible to install a thermometer 36 for measuring the temperature
of the heat insulated container or the temperature of the liquid in the jacket inside
the heat insulated container and to transmit the measured temperature to outside of
the oven by the wireless transmitter 18.
[0250] Due to this, it is possible to obtain a grasp of the internal temperature of the
oven wall shape measurement apparatus at the present point of time outside of the
oven. When the temperature approaches the upper limit of management, it is possible
to suspend the measurement and take the oven wall shape measurement apparatus outside
of the oven so as to prevent in advance damage to the oven wall shape measurement
apparatus due to the abnormally high temperatures.
[0251] The measurement apparatus of the present invention may set viewing positions in the
oven in advance and capture images of the oven wall at those positions as still images.
Due to this, it is possible to obtain images of the states of oven wall positions
where damage is predicted as occurring in advance.
[0252] Further, it is more preferable to capture images while moving the camera apparatus
8 in the depth direction of the oven and record the capture data in a data recorder
22. The camera apparatus 8 is moved in the depth direction of the oven by for example
as shown in FIG. 3 mounting the heat insulated container 3 housing the camera apparatus
8 etc. on the coke pusher 43 and inserting the coke pusher 43 into the oven or extracting
it from the oven at a constant speed by operation of a ram driver 46. It is possible
to move the camera apparatus 8 while continuously capturing images and view the results
of capture as a moving image.
[0253] More preferably, it is possible to capture images while moving the camera apparatus
8 in the depth direction of the oven and process and join the capture data recorded
in the data recorder 22 so as to obtain a single still image of a broad range in the
depth direction of the oven. For example, it is possible to capture images with a
speed of movement of the coke pusher of 300 mm/sec., a capture range in the width
direction of 100 mm, and a still image capture interval of the camera apparatus of
1/3 second.
[0254] FIG. 22 shows an oven wall picture obtained by stitching eight adjoining still images
at the image joining positions 73 to obtain an image 72 of a broad region. In this
broad region image, the light beam reflected light emitted by the light beam emitter
62 is reflected for each 100 mm pitch still image.
[0255] As shown in FIG. 22, if the light beam reflected light is the line of light 65 and
the direction of the line of light 65 is parallel to the depth direction of the oven,
the light is continuously reflected as a single long line of light overall. If the
light beam reflected light is a line of light and the direction of the line of light
is parallel to the height direction of the oven, the line of light facing the height
direction is reflected at 100 mm pitches. This data processing can be performed at
the data recorder 22.
[0256] In the measurement apparatus of the present invention arranging a wireless transmitter
18 in the heat insulated container, transmitting the capture information from the
heat insulated container to a wireless receiver 21 outside, recording this data in
an outside data recorder 22, and simultaneously recording the oven position information
of the camera apparatus (capture current position data 35 in the horizontal direction
in the oven) in a data recorder 22, it is possible to capture images while moving
the camera apparatus 8 in the depth direction of the oven and select still images
based on oven position information.
[0257] The case of taking still images at a pitch of 100 mm in the width direction and stitching
these still images to prepare an oven wall image of a broad range in the depth direction
of the oven will be explained as an example. The captured still images are successively
transmitted to an outside data recorder at for example a 1/30 second pitch.
[0258] The data recorder 22 outside of the oven selects the still images received at the
time each time the camera apparatus reaches the 100 mm pitch still image taking positions
based on the oven position information.
[0259] Due to this, as a result, by taking still images at 100 mm pitches in the width direction
and stitching together these still images, it is possible to prepare an oven wall
image extending over a broad range in the depth direction of the oven. With this method,
even if the running speed of the coke pusher mounting the heat insulated container
fluctuates, it is possible to acquire still images at equal intervals.
[0260] When arranging a wireless receiver in the heat insulated container and transmitting
oven position information from outside the oven to the heat insulated container, it
is sufficient to process the data in the same way as above in the heat insulated container.
[0261] Further, if arranging a wireless receiver enabling communication with the inside
of the heat insulated container and the outside of the oven, it is also possible to
transmit oven position information from outside the furnace to the heat insulated
container, select still images every constant interval in the heat insulated container,
and wirelessly transmit only the selected still images outside of the furnace.
[0262] In a measurement apparatus of the present invention capturing images while moving
the camera apparatus 8 in the depth direction of the oven to take still images and
stitching together these still images to prepare an oven wall image extending over
a broad range in the depth direction of the oven, it is also possible to capture images
so that overlapping parts occur between adjoining still images.
[0263] For example, by capturing images at a pitch of about 100 mm in the width direction
and making the size of the still images in the width direction 150 mm, 50 mm overlapping
parts will occur. The overlapping parts capture the same parts of the oven wall, so
it is possible to accurately position and align two images by pattern matching based
on the images of the oven walls.
[0264] If using this technique, even if there is some deviation in the oven position information
of the still images, it is possible to automatically correct this deviation and prepare
an accurate oven wall image of a broad range in the depth direction of the oven.
[0265] Further, even when it is not possible to use oven position information, it is possible
to determine the overlap of the images by pattern matching for a group of images taken
in time series with overlapping portions between adjacent images and successively
connect them to prepare an accurate oven wall image.
[0266] For example, when viewing the coking chamber of the coke oven, since the oven walls
are high in temperature, they emit red hot thermal radiation light. It is possible
to view the oven walls by capturing this thermal radiation light by a camera apparatus.
Further, when using an ordinary CCD camera as a camera apparatus, it is possible to
capture images at a shutter speed of about 1/1000 second.
[0267] With this fast a shutter speed, even with a speed of movement of the coke pusher
of 300 mm/sec., it is possible to obtain a sharp image free from blurring.
[0268] Next, a specific method for analyzing the captured light beam image and quantitatively
measuring the shape will be explained. A green laser is used as the beam light source.
The color components of the color CCD camera, that is, the R (red), G (green), and
B (blue) components, are analyzed and introduced into the recorder 30.
[0269] The image analysis of the shape measurement is performed for the G component image
corresponding to the laser wavelength. In the G component image, the thermal radiation
light of the oven wall is extremely weak and the light beam reflected light is viewed
bright. Therefore, by digital processing, it is possible to extract the line segment
of the light beam reflected light.
[0270] If the oven wall bricks were free from all damage and smooth, the line segment would
be straight, but as shown in FIG. 14(a), (b), and (c), if the oven wall has a depression
of Δx, deformation of Δy occurs at the line segment of the light beam reflected light.
Therefore, the number of pixels of the deformation Δy on the image are counted.
[0271] If the camera were to capture images from a direction perpendicular to the oven wall,
it would be possible to find Δx from the relationship Δx = tanθ × Δy. Note that the
relationship between the number of pixels on the image and the actual distance is
found in advance.
[0272] By moving the camera apparatus together with the moving apparatus in the depth direction
of the oven in this way, it is possible to fit the entire length of the oven wall
surface in a single still image. For the height direction of the oven, while depending
on the distance between the mirror surface and camera apparatus, ordinarily the capture
range is a range of about 500 to 600 mm. Therefore, in the height direction of the
oven, the range which can be captured at one time is limited.
[0273] In the coking chamber of the coke oven, the parts of the oven wall refractories where
damage is particularly severe are for example limited to the vicinity of the coal
charging line in the oven height direction etc..
[0274] Therefore, by setting the measurement apparatus of the present invention at a position
enabling the vicinity of the coal charging line to be viewed, even if the range of
viewing in the oven height direction is limited, it is possible to obtain sufficiently
useful data.
[0275] Of course, by providing a plurality of oven wall shape measurement apparatuses in
the height direction at the coke pusher, it becomes possible to view the oven wall
over a broad range in the oven height direction.
[0276] The measurement apparatus of the present invention is compact in shape, light in
weight, and does not require the provision of cooling pipes etc., so is easily changed
to any height of attachment to the pusher. Further, it is possible to make measurements
while changing the mounting position for each predetermined height to obtain oven
wall shape measurement data for the oven height as a whole.
[0277] In the measurement apparatus of the present invention, operating power cannot be
supplied from the outside during measurement, so a power supply 10 is provided inside
the heat insulated container. The light beam emitter 62, camera apparatus 8, data
recorder 22, and wireless transmitter 18 operate by power supplied from this power
supply 10. As the power supply 10, it is possible to use a dry cell, rechargeable
storage cell, etc..
[0278] If using a cell which cannot be recharged as the power supply 10, it is necessary
to open up the heat insulated container each time the cell is replaced. Further, even
if using a rechargeable power supply as a power supply 10, it becomes necessary to
open up the heat insulated container for each recharging if positioning the recharging
cable connection plug inside the heat insulated container.
[0279] As the power supply, a rechargeable power supply may be used. Further, as shown in
FIG. 19, by providing a recharging cable connection plug 25 at the outside of the
heat insulated container 3, it becomes possible to recharge without opening the heat
insulated container and therefore improve the work efficiency.
[0280] The recharging cable connection plug 25 may be covered at its outside by a heat insulating
cap 34 when inserted into the oven. Only the heat insulating cap 34 need be removed
at the time of recharging and the recharging cable connected.
[0281] Here, examples of the measurement apparatus of the present invention will be shown.
(EXAMPLES)
[0282] The oven wall shape measurement apparatus shown in FIG. 11 was used for the purpose
of viewing the surface of the oven walls of the coking chamber of the coke oven. The
external dimensions of the oven wall shape measurement apparatus 61 are a height of
500 mm, width of 300 mm, and length of 500 mm and the total weight about 50 kg.
[0283] As the heat insulated container 3 of the oven wall shape measurement apparatus, one
covered over its outer circumference with ceramic fiber board as a heat insulating
material 4 was used.
[0284] The thickness of the heat insulating material was made 30 mm. At the inside of the
heat insulating material, a jacket made of stainless steel was arranged. The jacket
was filled with a total of 30 liters of water 7. At the portion of the heat insulating
container 3 facing the oven wall, the thickness of the layer of water was 40 mm.
[0285] Inside of the heat insulated container were arranged two small sized laser light
emitters of a wavelength of 532 nm as light beam emitters and a color CCD camera as
the camera apparatus 8. The image signal captured by the camera apparatus was transmitted
outside of the oven by the wireless transmitter 18.
[0286] The heat insulated container and the heat insulating material were provided with
a viewing window 16 and a communication window 17. The viewing window was fit with
quartz glass on which metal-evaporation coating was coated.
[0287] Further, a rechargeable storage cell was provided as a power supply 10 and used to
supply power to the camera apparatus, light beam emitters, wireless transmitter, and
controller for controlling the same. As the light beam emitters, blue laser diodes
of a wavelength of 405 nm may be used.
[0288] As shown in FIG. 23, a photometer 71 is arranged in the vicinity of the camera apparatus
8 inside the heat insulated container 3. The photometer 71 uses a photo diode as a
light sensor and measures the average amount of light (thermal radiation light intensity)
in an oven wall surface of substantially the same field of vision as the camera apparatus
8. The signal from the photometer is sent to a voltage controller 75 of the light
beam emitters.
[0289] The voltage controller 74 adjusts the voltage of the power supplied to the lasers
of the light beam emitters based on the signal of the photometer. The relationship
between the output of the photometer 71 and the voltage applied to the lasers is investigated
in advanced by experiments to enable the lasers to be fired at the optimal intensities
in accordance with the intensity of the thermal radiation light of the oven wall.
[0290] In front of the heat insulated container, as shown in FIG. 11, mirror surfaces 2a
and 2b are arranged. The direction of the intersecting line 70 of the oven wall surface
66 and the mirror surfaces can be made the height direction of the oven, the two mirror
surfaces 2a and 2b can be set to angles with the oven walls 42a and 42b of 45°, and
the left and right oven walls 42a and 42b can be simultaneously captured in the field
of vision of the camera apparatus 8.
[0291] By arranging the mirror surfaces, the fields of vision 13a and 13b of the camera
apparatus have lengths on the long sides of 600 mm and lengths of the short sides
of 200 mm for each of the left and right oven walls. For the mirror surfaces, use
was made of the surface of the stainless steel container 11 containing cooling water
6 inside polished to a mirror finish. The container 11, as shown in FIG. 2(a), has
a long rectangular cross-sectional shape with two of its four outer surfaces made
mirror surfaces and the remaining two surfaces made heat insulating by a heat insulating
material 12.
[0292] The light beam emitters 62a and 62b were arranged at positions of the same height
as the camera apparatus 8 in the first embodiment as shown in FIG. 12(a) and emitted
light beams 63 generating lines of light 65. The direction of emission of the center
beam 69 was the horizontal direction. The beam was emitted in a slanted direction
at an angle θ with the oven wall surface 66 of 30°.
[0293] The line of light 65 was oriented in the height direction in the oven wall surface
66. The length of the line of light 65 at the oven wall surface 66 was 200 mm.
[0294] In the second embodiment, as shown in FIG. 15(a) and (b), the light beam emitter
62 was arranged above the camera apparatus 8 and emitted the light beam 63 to the
oven wall surface 66 by reflecting it at the mirror surface.
[0295] The direction of emission of the center beam 69 was the horizontal direction. The
beam was emitted from a slanted direction at an angle θ with the oven wall surface
66 of 60°. The line of light 65 was oriented in the depth direction of the oven at
the oven wall surface 66. The length of the line of light 65 at the oven wall surface
66 was 200 mm.
[0296] The oven wall shape measurement apparatus and mirror surfaces were attached to the
pusher 43. The total weight of the oven wall shape measurement apparatus is a comparatively
light one of approximately 50 kg. Further, since there is no need for arranging cooling
water pipes or signal cables, it is possible to easily attach the components to any
positions in the height direction of the pusher ram 44.
[0297] In the present example, as shown in FIG. 3, these components are either attached
to positions of the oven wall shape measurement apparatus 61 behind the pusher ram
44 using a support 45 or attached to positions of the oven wall shape measurement
apparatus 61' on a ram beam 47. By successively measuring the oven wall shape at different
heights in this way, it was possible to obtain oven wall shape measurement over a
broad range.
[0298] For the wireless communication, wireless communication using the electric waves of
a digital signal was adopted. The output of the camera apparatus and the output of
the thermometer 36 for measuring the temperature inside the measurement unit are converted
to a digital signal by the A/D converter 26 and sent to the digital signal wireless
transmitter 27. The digital signal wireless transmitter 27 functions as a wireless
transmitter 18 and sends a wireless signal 19 to a wireless receiver 21 outside of
the oven.
[0299] In the heat insulated container, the part through which the electromagnetic wave
passes is provided with a communication window 17 fit with quartz glass coated with
silica. This silica coating blocks the radiation heat from the oven and does not obstruct
the propagation of the electromagnetic waves since it is not a metal coating.
[0300] Outside of the coke oven, a digital signal wireless receiver 28 is arranged as a
wireless receiver 21, while a processor 30 and image display 31 are arranged as a
data recorder 22. The digital signal received by the digital signal wireless receiver
28 is transmitted to the D/A converter 29 and processor 30.
[0301] The data sent to the processor 30 is recorded in the computer. The analog signal
output from the D/A converter 29 is sent to the image display 31. The capture signal
measured in real time is processed to easily analyzable image information.
[0302] The data recorder 22 is also sent the capture current position data 35 found based
on the current position data of the pusher ram 44, so this data is also sent to the
processor 30 and image display 31.
[0303] In the processor 30, the capture information captured at different times can be arranged
based on the capture current position data 35 to produce a single still image extending
over the entire length in the depth direction of the coking chamber and to identify
locations of oven wall damage.
[0304] Specifically, along with movement of the pusher 43, each time the capture current
position data 35 is increased by 150 mm, the transmitted still image is fetched into
the processor 30. Since the length of the still image in the oven width direction
(short side) is 200 mm, adjoining images have 50 mm overlapping parts. It is possible
to use the overlapping parts for pattern matching and finely adjust the overlap of
the images. In this way, it is possible to produce a single still image extending
over the entire length in the depth direction of the coking chamber.
[0305] Each still image taken at a pitch of 150 mm in the depth direction of the oven shows
a line of light 65 caused by light emitted by a light emitter. The processor 30 can
digitally process the image of the color component emphasized in light near the wavelength
532 nm to take out only information of the line of light 65 and incorporate the information
of the line of light 65 into the original image again.
[0306] Due to this, as the image as a whole, it is possible to clearly reflect the image
of the oven wall and simultaneously clearly reflect the line of light 65 caused by
the emission of the light beam in it. It is possible to evaluate the state of drift
of the reflected line of light for each still image and calculate the depth of damage
of a local damaged part in the range of the line of light.
[0307] The results of viewing of the oven wall in the first example are shown in FIG. 20(a)
and (b). In this example, the direction of the line of light is parallel to the intersecting
line 70 of the oven wall surface and mirror surfaces, that is, the height direction
of the furnace. FIG. 20(a) shows an image of the oven wall 42a reflected in the mirror
surface 2a and an image of the oven wall 42b reflected in the mirror surface 2b in
the overall field of vision 9 of the camera apparatus.
[0308] In both images, the joint 49 of the bricks 48 are clearly discriminated and the lines
of light 65a and 65b due to the emission of the light beam are reflected.
[0309] FIG. 20(b) shows the image of a location of the oven wall where damage occurred.
A missing brick part 76 is viewed other than the normal joint 49. A line of light
65 is reflected across the missing brick part 76. From the drift 68 of the line of
light 65, it is possible to quantitatively evaluate the shape including the amount
of damage of the missing brick part 76.
[0310] The results of viewing of the oven wall in the second example are shown in FIGS.
21(a), (b), and (c). In this example, the direction of the line of light perpendicularly
intersects the intersecting line 70 of the oven wall surface and mirror surface, that
is, is arranged in the depth direction of the oven. FIG. 21(a) shows an image of the
oven wall 42a reflected in the mirror surface 2a and an image of the oven wall 42b
reflected in the mirror surface 2b in the overall field of vision 9 of the camera
apparatus.
[0311] In both images, the joint 49 of the bricks 48 is clearly discriminated and the lines
of light 65a and 65b due to the emission of the light beam are reflected.
[0312] FIG. 21(b) shows an image of a location of the oven wall where damage occurs. In
addition to the normal joint 49, a joint gap 50 and vertical crack 51 in the oven
wall are viewed. The line of light 65 is reflected across the joint gap 50 and the
vertical crack 51 in the oven wall. From the drifts 68c and 68d of the line of light
65, it is possible to quantitatively evaluate the shape including the amounts of damage
of a joint gap 50 and vertical crack 51 in the oven wall.
[0313] In the image shown in FIG. 21(c), a carbon deposit 52 is viewed. The line of light
65 is reflected across the carbon deposit 52. From the drift 68e of the line of light
65, it is possible to quantitatively evaluate the amount of the carbon deposit 52.
[0314] By combining still images obtained continuously along with movement of the pusher
43, it is possible to obtain an oven wall image over a broad region in the depth direction
of the oven.
[0315] FIG. 22 shows an oven wall picture obtained by combining eight adjoining still images
at the image joining positions 73 to obtain an image 72 of a broad region. The line
of light 65 due to the emission of light beams is arranged parallel to the depth direction
of the oven and is viewed as a substantially continuous straight line in the depth
direction.
[0316] It is possible to quantitatively evaluate the amounts of damage of the damaged parts
and deposition of the carbon deposits from the drifts 68a, 68b, and 68c in the line
of light 65. In an image of a broad region, identification of damaged locations is
easy. Further, it is possible to obtain a grasp of the overall state of damage at
a single glance. Therefore, this is useful in diagnosis and management of ovens.
[0317] During measurement, the data recorder 22 was successively sent data, so there was
no need to open the heat insulated container after measurement was completed and the
work efficiency of the measurement could be greatly improved. Further, it was possible
to catch oven wall damage during measurement in real time and accurately identify
even locations of occurrence of that damage, so it was possible to propose a repair
plan of the coking chamber without delay.
[0318] After the oven wall of one coking chamber finishes being viewed, before viewing the
oven wall of the next coking chamber, the discharge port 23 at the bottom of the heat
insulated container was opened and the raised temperature cooling water 7 discharged
and, simultaneously, ordinary temperature water was filled from the top filling port
24.
[0319] 15 liters of water was filled to lower the temperature of the heat insulated container
3, then the discharge port 23 at the bottom of the heat insulated container was closed
and water filled in the heat insulated container. In this way, the next measurement
was performed after sufficiently lowering the temperature of the heat insulated container
and the water in the heat insulated container, so it was possible to secure a measurement
time of more than 5 minutes at a time even when continuously viewing oven walls of
coking chambers.
[0320] The rechargeable storage cell used as the power supply 10 in the measurement unit
has a capacity enabling continuous measurement of the oven width of 10 coking chambers.
At the time of recharging, it is possible to recharge by connecting a recharging cable
to the recharging cable connection plug 25 arranged at the outside of the heat insulated
container, so the heat insulated container does not have to be opened for recharging
and recharging was possible with a good work efficiency.
[INDUSTRIAL APPLICABILITY]
[0321] In the oven wall viewing apparatus and the oven wall shape measurement apparatus
of the present invention, by housing a camera apparatus in the heat insulated container,
arranging a mirror surface at the outside of the heat insulated container, and capturing
an image of the oven wall surface reflected at the mirror surface by the camera apparatus,
the apparatus is compact in size and light in weight, does not require coolant water
piping etc., is able to be easily attached to and detached from a pusher or other
moving apparatus, and is able to view the necessary viewing range at a wall surface.
[0322] In the oven wall shape measurement apparatus of the present invention, by emitting
a light beam from a light beam emitter to the oven wall from a slanted direction,
capturing an image of an oven wall surface reflected at a mirror surface and including
light beam reflected light by a camera apparatus, and measuring the shape of the oven
wall based on the position of the light beam reflected light, it is possible to evaluate
the state of a broad two-dimensional range of the oven wall by the image and possible
to quantitatively evaluate the state of damage of a specific location.
[0323] Further, according to the two apparatuses of the present invention, by using a wireless
transmitter and receiver to record data outside of the oven, it is possible to combine
the captured oven wall image information and capture position information while maintaining
the advantages of being compact in size, light in weight, and simple in structure
and possible to propose an oven wall repair plan quickly utilizing the capture results.
[0324] Further, according to the two apparatuses of the present invention, by stitching
together the continuously taken still images, it is possible to obtain an oven wall
image of a broad region in the depth direction of the oven. In the broad region image,
identification of damaged portions is easy and the overall state of damage can be
grasped by a single glance. This is useful in diagnosing and managing ovens.
[0325] Further, according to the two apparatuses of the present invention, by using a heat
insulated container having a jacket filled with a liquid having a heat absorbing ability
and further having a heat insulating material covering it at the outside, it is possible
to secure a sufficient residence time in the high temperature oven while maintaining
the advantages of being compact in size, light in weight, and simple in structure.