[Technical Field]
[0001] Disclosed is an apparatus for removing a bird nest that accumulates on a reactor
core of a blast furnace.
[Background Art]
[0002] In general, an iron-making process of a blast furnace is a process of producing molten
metal by charging iron ore as a raw material of the molten metal and cokes as fuel
in a blast furnace and reducing and melting iron ore using high-temperature heat generated
via combustion of the cokes and reduction gas.
[0003] In a blast furnace operation for injecting pulverized coal, as cokes is replaced
by pulverized coal, a ratio of an ore thickness to a cokes thickness is increased
to reduce combustion of cokes at a furnace lower part, and resultantly, sinking speed
of charged materials in a furnace is degraded and, accordingly, as a retention time
of cokes in a blast furnace is increased, the possibility of collision between cokes
particles in a combustion zone is further increased, and in this case, pulverized
cokes generated by mechanical wear via a violent crash reaction accumulate on a cokes
layer at a predetermined position in the furnace. That is, a bird nest that is a layer
charged with cokes is formed on a reactor core of a blast furnace. The bird nest accumulates
around a combustion zone of the blast furnace reactor core.
[0004] Accordingly, to smoothly perform a blast furnace operation, reduction gas generated
at a lower part of the blast furnace needs to be smoothly moved to an upper part of
the blast furnace. To this end, a charged layer of cokes charged in the furnace needs
to be in a sound state.
[0005] The sound state of the layer charged with cokes in the furnace means that the amount
of powders less than 3 mm is low between charged layers and, accordingly, means that,
when the powders less than 3 mm are removed, an air void is appropriately ensured
to smoothly facilitate flow of reduction gas and flow of melted material in a furnace,
such as molten metal and slag.
[0006] That is, a high-temperature and high-pressure counter flow reactor reduces sintered
ore using CO gas that is a reducing agent obtained by combustion of cokes charged
in a furnace with heat wind supplied from the lower part to produce molten metal.
Gas formed in a combustion zone before a wind hole needs to be transmitted through
a layer charged with cokes and to be uniformly spread in a radius direction and a
vertical direction of the blast furnace, and to be prevented from channeling.
[0007] However, a large amount of powders generally accumulate on a reactor core part, and
thus, gas does not penetrate into the center of the blast furnace.
[0008] As described above, to remove pulverized powders present in a zone of a layer with
powers less than 3 mm, according to the prior art, the zone is blasted to remove the
powders, but when such a method is used, there is a problem in that a large amount
of powders are generated due to blasting. In addition, there is an attempt to inject
ore or low melting point flux including oxygen through a wind hole to remove powders,
but the possibility that injected materials act directly on the reactor core is low
and, thus, air permeability/flowage are lowered to disadvantageously degrade a furnace
state.
[DISCLOSURE]
[Technical Problem]
[0009] An exemplary embodiment of the present invention provides an apparatus for removing
a bird nest of a blast furnace having advantages of effectively removing a bird nest
by injecting a flux wired capsule into a bird nest that accumulates on a reactor core
of a blast furnace to improve a state of a reactor core.
[Technical Solution]
[0010] According to an embodiment of the present invention, an apparatus for removing a
bird nest of a blast furnace includes a pulverized coal lance connected with a combustion
zone inside the blast furnace to inject pulverized coal, a flux wired capsule supplied
to the bird nest around the combustion zone through the pulverized coal lance to melt
and remove the bird nest, and a high-pressure projectile installed to be connected
with an end portion of the pulverized coal lance while accommodating the capsule to
shoot the capsule to the bird nest using high-pressure nitrogen gas.
[0011] The pulverized coal lance may further include a control valve installed between the
pulverized coal lance and the high-pressure projectile to control a supplied high-pressure
nitrogen gas amount.
[0012] The pulverized coal lance may further include a blow pipe connectively installed
outside the pulverized coal lance to supply wind.
[0013] The high-pressure projectile may further include a high-pressure gas container for
connectively installed to a rear side of the high-pressure projectile to accommodate
and supply high-pressure nitrogen gas.
[0014] The high-pressure projectile may further include a control value installed between
the high-pressure projectile and the high-pressure gas container to control an amount
of the high-pressure nitrogen gas.
[0015] The high-pressure projectile may include a loader loading and shooting the plurality
of capsules, and a cover installed in the loader to be open and closed.
[0016] The capsule may be molded of a plastic material and may be configured to accommodate
a mill scale flux containing water or a hydrogen peroxide solution or a hydrogen peroxide
aqueous solution therein.
[0017] The capsule may include a warhead installed in a front portion thereof to be inserted
into the bird nest, a cylinder installed behind the warhead to contain a flux therein,
and a cap installed behind the cylinder to seal the cylinder.
[0018] The warhead and the cap may include sealing grooves formed on external circumferential
surfaces thereof, respectively, and may be configured in such a way that sealing rings
are installed at the sealing grooves, respectively, to seal the cylinder.
[0019] The cylinder may be configured as a large capacity cylinder connected with another
cylinder.
[0020] The large capacity cylinder may include a flexible connection portion installed at
an intermediate portion thereof to be bent during entrance into the bird nest.
[0021] The capsule may further include a position adjustment plate inserted into the warhead
to adjust a proceeding position of the capsule.
[0022] The position adjustment plate may be selectively installed at up, down, left, and
right sides of the warhead to adjust a proceeding position of the warhead through
a load of the position adjustment plate and to adjust a destination point of the capsule
in up, down, left, and right directions.
[Advantageous Effects]
[0023] According to the apparatus, a bird nest of a blast furnace reactor core may be effectively
removed to prevent reduction in an output due to degradation in a wind amount generated
due to deactivated reactor core and to lower a wind pressure and stabilize a furnace
state by enhancing a state of the reactor core.
[0024] In addition, since pulverized powders of the bird nest reacts with a flux to remove
the pulverized powders, efficiency of transmitting hot air may not be prevented from
being lowered due to pulverized powders, thereby increasing an output.
[Description of the Drawings]
[0025]
FIG. 1 is a schematic diagram showing an apparatus for removing a bird nest of a blast
furnace according to an exemplary embodiment.
FIG. 2 is a schematic diagram showing a structure of the apparatus for removing a
bird nest of a blast furnace according to the present exemplary embodiment.
FIG. 3 is a schematic diagram showing a capsule of an apparatus for removing a bird
nest according to the present exemplary embodiment.
FIG. 4 is a schematic diagram showing a configuration of a capsule according to the
present exemplary embodiment.
FIG. 5 is a schematic diagram of a capsule according to another exemplary embodiment
of the present exemplary embodiment.
FIG. 6 is a schematic diagram showing a state in which a position adjustment plate
is installed in a capsule according to the present exemplary embodiment.
[Mode for Invention]
[0026] The technical terminology used herein is for the purpose of describing particular
exemplary embodiments only and is not intended to be limiting of the present invention.
Here, the singular expressions in the present specification include the plural expressions
unless clearly specified otherwise in context. In the present specification, it should
be understood that the terms, such as 'including' or 'having,' etc., are intended
to indicate the existence of the features, regions, integers, steps, operations, components,
and/or elements, and are not intended to preclude the possibility that other features,
regions, integers, steps, operations, components, elements, and/or combinations thereof
may exist or may be added.
[0027] Exemplary embodiments of the present invention are described in detail so as for
those of ordinary skill in the art to easily implement with reference to the accompanying
drawing. It will be easily understood by those skilled in the art that various changes
in form and details may be made therein without departing from the spirit and scope
of the invention. Accordingly, as those skilled in the art would realize, the described
embodiments may be modified in various different ways, all without departing from
the spirit or scope of the present invention.
[0028] FIG. 1 is a schematic diagram showing an apparatus for removing a bird nest of a
blast furnace according to an exemplary embodiment.
[0029] FIG. 2 is a schematic diagram showing a structure of the apparatus for removing a
bird nest of a blast furnace according to the present exemplary embodiment.
[0030] FIGS. 1 and 2 disclose the apparatus for removing a bird nest of a blast furnace
for effectively removing a bird nest 3 accumulated on a reactor core to activate a
reactor core in a blast furnace 1.
[0031] The apparatus for removing a bird nest of a blast furnace according to the present
exemplary embodiment may include a pulverized coal lance 10 connected with a combustion
zone 2 inside the blast furnace 1 to inject pulverized coal, a flux wired capsule
20 that is supplied to the bird nest 3 around the combustion zone 2 through the pulverized
coal lance 10 to melt and remove the bird nest 3, and a high-pressure projectile 30
that is installed to be connected with an end portion of the pulverized coal lance
10 while accommodating the capsule 20 to shoot the capsule 20 to the bird nest 3 using
high-pressure nitrogen gas.
[0032] That is, the capsule 20 may be shot to the bird nest 3 accumulated on the reactor
core through the high-pressure projectile 30 using high-pressure nitrogen gas to remove
the bird nest 3 via a reaction between the flux in the capsule 20 and the bird nest
3.
[0033] The pulverized coal lance 10 put into the combustion zone 2 of the blast furnace
1 may further include a control valve 11 that is installed between the pulverized
coal lance 10 and the high-pressure projectile 30 to control a supplied high-pressure
nitrogen gas amount, and may further include a blow pipe 12 that is connectively installed
outside the pulverized coal lance 10 to supply wind.
[0034] Speed of injecting high-pressure nitrogen gas and the amount of the nitrogen gas
may be controlled through the control valve 11 installed in the pulverized coal lance
10 to control shooting speed of the capsule 20 and may more effectively transmit wind
to the pulverized coal lance 10 through the blow pipe 12 installed outside the pulverized
coal lance 10.
[0035] The high-pressure projectile 30 for shooting the capsule 20 to the bird nest 3 may
further include a high-pressure gas container 31 that is connectively installed to
a rear side of the high-pressure projectile 30 to accommodate and supply high-pressure
nitrogen gas, and may further include a control valve 32 installed between the high-pressure
projectile 30 and the high-pressure gas container 31 to control the amount of high-pressure
nitrogen gas.
[0036] The high-pressure projectile 30 may receive high-pressure nitrogen gas from the high-pressure
gas container 31 installed at a rear side of the high-pressure projectile 30 to shoot
the capsule 20, and may control the amount of gas supplied to the high-pressure projectile
30 from the high-pressure gas container 31 through the control valve 32.
[0037] The high-pressure projectile 30 may include a loader 33 for loading and shooting
the plurality of capsules 20, and a cover 34 installed in the loader 33 to be open
and closed, and thus, the plurality of capsules 20 may be shot to the bird nest 3
of a reactor core in a state in which the capsules 20 are loaded in the loader 33
through a structure of the high-pressure projectile 30, and the cover 34 to be open
and closed may be installed to maintain air-tightness of the loader 33.
[0038] FIG. 3 is a schematic diagram showing a capsule of an apparatus for removing a bird
nest according to the present exemplary embodiment.
[0039] FIG. 4 is a schematic diagram showing a configuration of a capsule according to the
present exemplary embodiment.
[0040] As shown in FIGS. 3 and 4, the capsule 20 may be molded of a plastic material and
may be configured to accommodate a mill scale flux containing water and a hydrogen
peroxide solution or a hydrogen peroxide aqueous solution therein.
[0041] That is, a decomposition and exothermic reaction may proceed via a catalyst decomposition
reaction with the bird nest 3 in the blast furnace 1 due to a material contained in
the capsule 20, carbon in a pulverized powder may combust due to oxygen generated
during decomposition, and the bird nest 3 may be removed by forming melt thereof to
clean the bird nest 3.
[0042] The capsule 20 may be configured to include a warhead 21 installed in a front portion
thereof to be inserted into the bird nest 3, a cylinder 22 installed behind the warhead
21 to contain a flux therein, and a cap 23 installed behind the cylinder 22 to seal
the cylinder 22.
[0043] The warhead 21 and the cap 23 may include sealing grooves 21a and 23a formed on external
circumferential surfaces thereof, respectively, and may be configured in such a way
that sealing rings 21b and 23 are installed at the sealing grooves 21a and 23a, respectively,
to seal the cylinder 22.
[0044] The air-tightness of the cylinder 22 may be maintained through the warhead 21 and
cap 23, and the sealing rings 21b and 23b coupled thereto to stably put materials
contained in the cylinder 22 into the bird nest 3.
[0045] Accordingly, the above configured capsule 20 may be shot into the bird nest 3 of
the blast furnace 1 to remove the bird nest 3, and thus, the capsule 20 containing
a mill scale flux along with a hydrogen peroxide solution may be continuously put
into the bird nest 3 and may be mixed with pulverized powders of the bird nest 3 to
remove the pulverized powders, and accordingly, a passage may be formed to allow gas
to flow through the reactor core to overcome deactivation of the reactor core.
[0046] FIG. 5 is a schematic diagram of a capsule according to another exemplary embodiment
of the present exemplary embodiment.
[0047] As shown in FIG. 5, the cylinder 22 may be configured as a large capacity cylinder
22a connected with another cylinder, and the large capacity cylinder 22a may include
a flexible connection portion 22b installed at an intermediate portion thereof to
be bent during entrance into the bird nest 3.
[0048] That is, the capsule 20 may have an optimum length of 200 mm to be injected through
the pulverized coal lance 10, but when the large capacity cylinder 22a formed by increasing
the length of the capsule 20 is used to inject a larger amount of materials, a problem
is predicted to arise in that the materials are not transmitted through the bent pulverized
coal lance 10 and the pulverized coal lance 10 clogs, and thus, to prevent the problem,
the flexible connection portion 22b may be connectively formed in the intermediate
portion of the large capacity cylinder 22a to allow materials to smoothly pass through
the bent portion.
[0049] FIG. 6 is a schematic diagram showing a state in which a position adjustment plate
is installed in a capsule according to the present exemplary embodiment.
[0050] As shown in FIG. 6, the capsule 20 may further include a position adjustment plate
24 that is inserted into the warhead 21 to adjust a proceeding position of the capsule
20, and the position adjustment plate 24 may be selectively installed at up, down,
left, and right sides of the warhead 21 to adjust a proceeding position of the warhead
21 through a load of the position adjustment plate 24 and to adjust a destination
point of the capsule 20 in up, down, left, and right directions.
[0051] That is, when a gap is formed in the warhead of the capsule 20 and the position adjustment
plate 24 with a diameter equal to or less than the capsule 20 is inserted into the
gap, gas in a furnace may act in a lower direction of the position adjustment plate
24 inserted into the warhead 21 while the capsule 20 proceeds, and thus, a position
of the warhead 21 of the capsule 20 inserted into the bird nest 3 may be changed,
thereby adjusting a destination of the capsule 20 in up, down, left, and right directions.
[0052] Accordingly, after the capsule 20 is positioned in the pulverized coal lance 10,
the position of the position adjustment plate 24 inserted into the warhead 21 of the
capsule 20 may be adjusted in up, down, left, and right directions to be moved to
a target position of the bird nest 3, and then, the control valve 32 of the high-pressure
projectile 30 may be open to put the capsule 20 into the bird nest 3 due to high-pressure
nitrogen gas, and accordingly, a material for forming a mill scale flux contained
in the capsule 20 may be uniformly distributed in up, down, left, and right direction
rather than being concentrated and shot into one point.
[0053] Accordingly, when pulverized powders of the bird nest 3 are removed by the flux contained
in the cylinder 22 of the capsule 20, ventilation resistance may be reduced and hot
air blown through a wind hole may be deeply injected into a reactor core, and thus,
gas and the flux may smoothly flow, a wind flow rate may be increased, and a wind
pressure may be reduced to activate the reactor core.
[0054] Accordingly, the bird nest 3 of the reactor core of the blast furnace 1 may be effectively
removed to prevent reduction in an output due to degradation in a wind amount generated
due to deactivated reactor core and to lower a wind pressure by enhancing a state
of the reactor core, and thus, since a furnace state may be stabilized and pulverized
powders of the bird nest 3 may react with a flux to remove the pulverized powders,
efficiency of transmitting hot air may be prevented from being lowered due to pulverized
powders, thereby increasing an output.
[0055] While this invention has been illustrated and described in connection with what is
presently considered to be practical exemplary embodiments, it is to be understood
that the invention is implemented in various different forms by those of ordinary
skill in the art. The prevent invention is intended to cover various modifications
and equivalent arrangements included within the spirit and scope of the appended claims.
1. An apparatus for removing a bird nest of a blast furnace, comprising:
a pulverized coal lance connected with a combustion zone inside the blast furnace
to inject pulverized coal;
a flux wired capsule supplied to the bird nest around the combustion zone through
the pulverized coal lance to melt and remove the bird nest; and
a high-pressure projectile installed to be connected with an end portion of the pulverized
coal lance while accommodating the capsule to shoot the capsule to the bird nest using
high-pressure nitrogen gas.
2. The apparatus of claim 1, wherein:
the pulverized coal lance further includes a control valve installed between the pulverized
coal lance and the high-pressure projectile to control a supplied high-pressure nitrogen
gas amount.
3. The apparatus of claim 2, wherein:
the pulverized coal lance further includes a blow pipe connectively installed outside
the pulverized coal lance to supply wind.
4. The apparatus of claim 1, wherein:
the high-pressure projectile further includes a high-pressure gas container for connectively
installed to a rear side of the high-pressure projectile to accommodate and supply
high-pressure nitrogen gas.
5. The apparatus of claim 4, wherein:
the high-pressure projectile further includes a control value installed between the
high-pressure projectile and the high-pressure gas container to control an amount
of the high-pressure nitrogen gas supplied.
6. The apparatus of claim 1, wherein:
the high-pressure projectile includes a loader loading and shooting the plurality
of capsules, and a cover installed in the loader to be open and closed.
7. The apparatus of claim 1, wherein:
the capsule is molded of a plastic material and is configured to accommodate a mill
scale flux containing water or a hydrogen peroxide solution or a hydrogen peroxide
aqueous solution therein.
8. The apparatus of claim 7, wherein:
the capsule includes a warhead installed in a front portion thereof to be inserted
into the bird nest, a cylinder installed behind the warhead to contain a flux therein,
and a cap installed behind the cylinder to seal the cylinder.
9. The apparatus of claim 8, wherein:
the warhead and the cap include sealing grooves formed on external circumferential
surfaces thereof, respectively, and are configured in such a way that sealing rings
are installed at the sealing grooves, respectively, to seal the cylinder.
10. The apparatus of claim 8, wherein:
the cylinder is configured as a large capacity cylinder connected with another cylinder.
11. The apparatus of claim 10, wherein:
the large capacity cylinder includes a flexible connection portion installed at an
intermediate portion thereof to be bent during entrance into the bird nest.
12. The apparatus of claim 8, wherein:
the capsule further includes a position adjustment plate inserted into the warhead
to adjust a proceeding position of the capsule.
13. The apparatus of claim 12, wherein:
the position adjustment plate is selectively installed at up, down, left, and right
sides of the warhead to adjust a proceeding position of the warhead through a load
of the position adjustment plate and to adjust a destination point of the capsule
in up, down, left, and right directions.