FIELD
[0001] The present disclosure relates to a technical field of household appliances, and
more particularly to a combustor and a gas water heater having the same.
BACKGROUND
[0002] As ecological environment is increasingly deteriorating, human suffers more and more
severe harm. People attach more and more attention to air pollution. All industries
are responding to the national call to conduct energy conservation and emission reduction.
With a rapid development of urban fuel gas, a gas water heater is becoming more and
more popular with people as it is convenient and efficient. However, in existing gas
water heaters, as combustion of the fuel gas will produce harmful gas inevitably and
especially the content of nitrogen oxides in fume is high, which cause severe environmental
pollution.
SUMMARY
[0003] Embodiments of the present disclosure seek to solve at least one of the problems
existing in the related art to at least some extent. To this end, a combustor is provided
by the present disclosure, the combustor may reduce emission of nitrogen oxides in
fume and reduce environment pollution.
[0004] A gas water heater having the combustor is further provided by the present disclosure.
[0005] The combustor according to a first aspect of embodiments of the present disclosure
includes at least one combustion unit, the combustion unit includes a combustor shell,
in which the combustor shell has a first rich combustion cavity, a second rich combustion
cavity and a lean combustion cavity therein, and the combustor shell thereon is provided
with a rich combustion injection port in communication with the first rich combustion
cavity and the second rich combustion cavity, a lean combustion injection port in
communication with the lean combustion cavity, a first rich combustion flame port
in communication with the first rich combustion cavity, a second rich combustion flame
port in communication with the second rich combustion cavity and a lean combustion
opening in communication with the lean combustion cavity; a rectifying device, disposed
in the lean combustion opening and provided with a plurality of lean combustion flame
ports in communication with the lean combustion cavity, in which the first rich combustion
flame port and the second rich combustion flame port are located at two sides of the
plurality of lean combustion flame ports respectively; in which, a sectional area
S1 of the rich combustion injection port and a sectional area S2 of the lean combustion
injection port satisfy: S1/S2=0.20∼0.40.
[0006] In the combustor according to embodiments of the present disclosure, the first rich
combustion flame port and the second rich combustion flame port of the combustion
unit are located at two sides of the plurality of lean combustion flame ports respectively,
so as to form the stable flame structure having the lean combustion flame in the middle
and the rich combustion flames at both sides, thereby reducing the flame temperature
and controlling emission of the nitrogen oxides in the fume after the combustion.
In which the sectional area S1 of the rich combustion injection port and the sectional
area S2 of the lean combustion injection port satisfy: S1/S2=0.20∼0.40, achieving
a good mixture proportion of the air introduced by the rich combustion injection port
to the fuel gas and a good mixture proportion of the air introduced by the lean combustion
injection port to the fuel gas, so as further controlling the structural stability
of the combustion flame and reducing the emission of nitrogen oxides.
[0007] In addition, the combustor according to embodiments of the present disclosure further
includes the following additional technical features:
According to some embodiments of the present disclosure, a first blind passage and
a second blind passage are defined between the rectifying device and two side walls
of the lean combustion opening respectively, in which the first blind passage is located
between the first rich combustion flame port and the plurality of lean combustion
flame ports, and the second blind passage is located between the second rich combustion
flame port and the plurality of lean combustion flame ports.
[0008] Optionally, a top surface of an outer side wall of the first blind passage is flush
with a top surface of an outer side wall of the second blind passage and higher than
a top surface of the rectifying device, a top surface of an outer side wall of the
first rich combustion flame port is flush with a top surface of an outer side wall
of the second rich combustion flame port and higher than the top surface of the outer
side wall of the first blind passage and the top surface of the outer side wall of
the second blind passage, a height difference between the top surface of the outer
side wall of the first blind passage and the top surface of the rectifying device
and a height difference between the top surface of the outer side wall of the second
blind passage and the top surface of the rectifying device are denoted by H1, and
a height difference between the top surface of the outer side wall of the first rich
combustion flame port and the top surface of the rectifying device and a height difference
between the top surface of the outer side wall of the second rich combustion flame
port and the top surface of the rectifying device are denoted by H2, wherein H2 ≥H1.
[0009] Optionally, the maximum width of the first blind passage and the maximum width of
the second blind passage are equal and denoted by W2, the maximum width of the first
rich combustion flame port and the maximum width of the second rich combustion flame
port are equal and denoted by W1, in which W2 ≥ W1.
[0010] According to some embodiments of the present disclosure, the maximum width of the
lean combustion flame port is denoted by W3 and a height of the rectifying device
is denoted by H, in which, W3/H=0.03∼0.30.
[0011] According to some embodiments of the present disclosure, a ratio of the amount of
air to that of fuel gas in theory for complete combustion of fuel gas is denoted by
Φ
S and a mixture ratio of the amount of air to that of fuel gas at the rich combustion
injection port is denoted by Φ
R, wherein Φ
R/Φ
S=0.5∼0.8.
[0012] According to some embodiments of the present disclosure, the ratio of the amount
of air to that of fuel gas in theory for complete combustion of fuel gas is denoted
by Φ
S, a mixture ratio of the amount of air to that of fuel gas at the lean combustion
injection port is denoted by Φ
L, wherein Φ
L/Φ
8 =1.5∼2.0.
[0013] According to some embodiments of the present disclosure, the combustor shell comprises:
a first lean combustion shell portion and a second lean combustion shell portion,
wherein the first lean combustion shell portion and the second lean combustion shell
portion are connected together and define the lean combustion cavity and the lean
combustion opening together, and the rectifying device is disposed between the first
lean combustion shell portion and the second lean combustion shell portion and located
at the lean combustion opening; and
a first rich combustion shell portion and a second rich combustion shell portion,
wherein the first rich combustion shell portion is connected to the first lean combustion
shell portion and is located outside of the first lean combustion shell portion, the
first rich combustion shell portion and the first lean combustion shell portion together
define the first rich combustion cavity and the first rich combustion flame port,
the second rich combustion shell portion is connected to the second lean combustion
shell portion and located outside of the second lean combustion shell portion, the
second rich combustion shell portion and the second lean combustion shell portion
define the second rich combustion cavity and the second rich combustion flame port
together.
[0014] Optionally, the combustor shell further includes a plurality of connecting slats,
in which two ends of each connecting slat are connected to the first rich combustion
shell portion and the second rich combustion shell portion respectively, and the plurality
of connecting slats divide each of the first rich combustion flame port, the second
rich combustion flame port and the lean combustion flame port into a plurality of
segments.
[0015] Optionally, the combustor shell further includes a lean combustion injector, connected
to the first lean combustion shell portion and the second lean combustion shell portion,
in which the lean combustion injection port is disposed on the lean combustion injector;
and a rich combustion injector, connected to the first rich combustion shell portion
and the second rich combustion shell portion and in communication with the first rich
combustion cavity and the second rich combustion cavity, in which the rich combustion
injector is located above the lean combustion injector and the rich combustion injection
port is disposed on the rich combustion injector.
[0016] According to some embodiments of the present disclosure, the combustion unit further
includes a rich combustion nozzle configured to provide the rich combustion injection
port with the fuel gas and corresponding to the rich combustion injection port; and
a lean combustion nozzle configured to provide the lean combustion injection port
with the fuel gas and corresponding to the lean combustion injection port.
[0017] Optionally, a sectional area S3 of a gas jet port of the rich combustion nozzle and
a sectional area S4 of a gas jet port of the lean combustion nozzle satisfy: S3/S4=0.25∼0.65.
[0018] According to some embodiments of the present disclosure, a plurality of combustion
units are provided and arranged along a width direction of the combustion unit.
[0019] According to a second aspect of embodiments of the present disclosure, the gas water
heater having the combustor of the above embodiments is provided.
[0020] As the combustor according to the above embodiments of the present disclosure has
the above technical effects, hence the gas water heater according to embodiments of
the present disclosure also has the above technical effects. That is to say, the gas
water heater according to embodiments of the present disclosure is provided with the
combustor according to the above embodiments, thereby the stability of flame structure
may be improved, the temperature of the flame may be reduced and the emission of nitrogen
oxides in fume of the gas water heater may be reduced.
[0021] Additional aspects and advantages of embodiments of present disclosure will be given
in part in the following descriptions, become apparent in part from the following
descriptions, or be learned from the practice of the embodiments of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022]
Fig. 1 is a schematic view of a combustion unit of a combustor according to embodiments
of the present disclosure from a perspective;
Fig. 2 is a schematic view of a combustion unit of a combustor according to embodiments
of the present disclosure from another perspective;
Fig. 3 is a cross sectional view along a line A-A shown in Fig. 2;
Fig. 4 is a top view of a combustion unit of a combustor according to embodiments
of the present disclosure;
Fig. 5 is an exploded view of a combustion unit of a combustor according to embodiments
of the present disclosure;
Fig. 6 is a schematic view of a combustion unit of a combustor according to another
embodiment of the present disclosure;
Fig. 7 is sectional view along a line B-B shown in Fig. 6;
Fig. 8 is an enlarged view of a portion C shown in Fig. 7.
Reference numerals:
[0023]
1: combustion unit;
11: combustor shell, 111: first rich combustion shell portion, 1111: first rich combustion
cavity, 112: second rich combustion shell portion, 1121: second rich combustion cavity,
113: first lean combustion shell portion, 114: second lean combustion shell portion,
1141: lean combustion cavity, 115: lean combustion opening, 116: first blind passage,
117: second blind passage, 118: first rich combustion flame port, 119: second rich
combustion flame port;
12: lean combustion injector, 121: lean combustion injection port;
13: rich combustion injector, 131: rich combustion injection port;
14: rectifying device, 141: lean combustion flame port;
15: rich combustion nozzle;
16: lean combustion nozzle;
17: connecting slat.
DETAILED DESCRIPTION
[0024] Reference will be made in detail to embodiments of the present disclosure. The embodiments
described herein with reference to drawings are explanatory, illustrative, and used
to generally understand the present disclosure. The embodiments shall not be construed
to limit the present disclosure.
[0025] In the specification, it is to be understood that terms such as "central," "longitudinal,"
"lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left,"
"right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise,"
and "counterclockwise" should be construed to refer to the orientation as then described
or as shown in the drawings under discussion. These relative terms are for convenience
of description and do not require that the present invention be constructed or operated
in a particular orientation.
[0026] In addition, terms such as "first" and "second" are used herein for purposes of description
and are not intended to indicate or imply relative importance or significance or to
imply the number of indicated technical features. Thus, the feature defined with "first"
and "second" may comprise one or more of this feature. In the description of the present
invention, "a plurality of' means two or more than two, unless specified otherwise.
[0027] In the present invention, unless specified or limited otherwise, the terms "mounted,"
"connected," "coupled," "fixed" and the like are used broadly, and may be, for example,
fixed connections, detachable connections, or integral connections; may also be mechanical
or electrical connections; may also be direct connections or indirect connections
via intervening structures; may also be inner communications of two elements, which
can be understood by those skilled in the art according to specific situations.
[0028] A combustor according to embodiments of the present disclosure will be described
with reference to drawings in the following.
[0029] Referring to Figs. 1-8, the combustor according to embodiments of the present disclosure
may include at least one combustion unit 1, each combustion unit 1 includes a combustor
shell 11 and a rectifying device 14.
[0030] The combustor shell 11 defines a first rich combustion cavity 1111, a second rich
combustion cavity 1121 and a lean combustion cavity 1141 therein. The combustor shell
11 is provided with a rich combustion injection port 131 in communication with the
first rich combustion cavity 1111 and the second rich combustion cavity 1121, a lean
combustion injection port 121 in communication with the lean combustion cavity 1141,
a first rich combustion flame port 118 in communication with the first rich combustion
cavity 1111, a second rich combustion flame port 119 in communication with the second
rich combustion cavity 1121 and a lean combustion opening 115 in communication with
the lean combustion cavity 1141 thereon. The rectifying device 14 is disposed in the
lean combustion opening 115 and the rectifying device 14 is provided with a plurality
of lean combustion flame ports 141 in communication with the lean combustion cavity
1141, the first rich combustion flame port 118 and the second rich combustion flame
port 119 are located at both sides of the plurality of lean combustion flame ports
141 respectively, in which, a sectional area S1 of the rich combustion injection port
131 and a sectional area S2 of the lean combustion injection port 121 satisfy: S1/S2=0.20∼0.40.
[0031] In other words, the combustor 100 may include one or more combustion units 1, for
example, the combustor 100 may include a plurality of combustion units 1, the plurality
of combustion units 1 are arranged side by side and are arrayed along a width direction
of the combustion unit 1. The width direction refers to a left-right direction shown
in Fig. 5 and Fig. 7. Each combustion unit 1 includes the combustor shell 11 and the
rectifying device 14, the rectifying device 14 is disposed in the combustor shell
11.
[0032] The combustor shell 11 defines the first rich combustion cavity 1111, the second
rich combustion cavity 1121 and the lean combustion cavity 1141 therein. The combustor
shell 11 is provided with the rich combustion injection port 131, the lean combustion
injection port 121, the first rich combustion flame port 118, the second rich combustion
flame port 119 and the lean combustion opening 115 thereon. The rich combustion injection
port 131 is configured to introduce air for the rich combustion and the lean combustion
injection port 121 is configured to introduce air for the lean combustion. Referring
to Fig. 1- Fig. 3 and Fig. 6, the rich combustion injection port 131 is located above
the lean combustion injection port 121.
[0033] The rich combustion injection port 131 is in communication with the first rich combustion
cavity 1111 and the second rich combustion cavity 1121, the first rich combustion
cavity 1111 is in communication with the first rich combustion flame port 118, the
second rich combustion cavity 1121 is in communication with the second rich combustion
flame port 119, the lean combustion injection port 121 is in communication with the
lean combustion cavity 1141, as well the lean combustion cavity 1141 is in communication
with the lean combustion opening 115.
[0034] In this way, the air is introduced in from the rich combustion injection port 131
and is mixed with fuel gas to form rich combustion gas, the rich combustion gas after
being mixed may enter the first rich combustion cavity 1111 and the second rich combustion
cavity 1121, then be led to the first rich combustion flame port 118 and the second
rich combustion flame port 119 respectively. The air introduced in by the lean combustion
injection port 121 is mixed with the fuel gas to form lean combustion gas which flows
to the lean combustion cavity 1141 then. Referring to Figs. 5-8, the rectifying device
14 is disposed in the lean combustion opening 115, the rectifying device 14 is provided
with the plurality of lean combustion flame ports 141, the lean combustion cavity
1141 is in communication with the plurality of lean combustion flame ports 141, and
the lean combustion gas may be led to the plurality of lean combustion flame ports
141.
[0035] Referring to Fig. 4, Fig. 5, Fig. 7 and Fig. 8, the first rich combustion flame port
118 and the second lean combustion flame port 141 are disposed at both sides of the
lean combustion opening 115 respectively, the plurality of lean combustion flame ports
141 are located between the first rich combustion flame port 118 and the second rich
combustion flame port 119. In this way, a structure having a middle configured to
be the lean combustion flame ports 141 and two sides configured to be the rich combustion
ports may be formed at the top of each combustion unit 1. That is to say, the combustion
unit 1 may allow a flame structure having a lean flame in the middle and rich flames
at the two sides during the combustion, so that stability of the flame may be improved,
and temperature of the combustion flame may be reduced, controlling emission of nitrogen
oxides in fume.
[0036] The sectional area of the rich combustion injection port 131 is denoted by S1, the
sectional area of the lean combustion injection port 121 is denoted by S2, S1 and
S2 may satisfy: S1/S2=0.20∼0.40, that is to say, the sectional area S1 of the rich
combustion injection port 131 is 0.20-0.40 percent of the sectional area S2 of the
lean combustion injection port 121. Thus, the amount of air introduced by the rich
combustion injection port 131 and the lean combustion injection port 121 may be controlled,
moreover the mixture proportion of the air introduced by the rich combustion injection
port 131 to the fuel gas and the mixture proportion of the air introduced by the lean
combustion injection port 121 to the fuel gas are good, so as to control the primary
air ratio of the rich combustion or the lean combustion. The primary air ratio refers
to a ratio of the proportion of the amount of air to that of fuel gas when the fuel
gas is mixed with the air in advance, to the proportion of the amount of air to that
of fuel gas in theory for a complete combustion of fuel gas. Thereby the stability
of the flame structure may be improved effectively, so as to further reduce the emission
of nitrogen oxides in fume and reduce the environment pollution.
[0037] Thus, in the combustor according to embodiments of the present disclosure, the first
rich combustion flame port 118 and the second rich combustion flame port 119 of the
combustion unit 1 are located at two sides of the plurality of lean combustion flame
ports 141 respectively, so as to form the stable flame structure having the lean combustion
flame in the middle and the rich combustion flames at both sides, thereby reducing
the flame temperature and controlling emission of the nitrogen oxides in the fume
after the combustion. In which the sectional area S1 of the rich combustion injection
port 131 and the sectional area S2 of the lean combustion injection port 121 satisfy:
S1/S2=0.20∼0.40, achieving good mixture proportion of the air introduced by the rich
combustion injection port 131 to the fuel gas and good mixture proportion of the air
introduced by the lean combustion injection port 121 to the fuel gas, so as further
controlling the structural stability of the combustion flame and reducing the emission
of nitrogen oxides.
[0038] In some embodiments of the present disclosure, a first blind passage 116 and a second
blind passage 117 may be defined between the rectifying device 14 and two side walls
of the lean combustion opening 115 respectively, the first blind passage 116 is located
between the first rich combustion flame port 118 and the plurality of lean combustion
flame ports 141, and the second blind passage 117 is located between the second rich
combustion flame port 119 and the plurality of lean combustion flame ports 141. As
shown in Fig. 7 and Fig. 8, the rectifying device 14 is disposed in the lean combustion
opening 115 and is connected to the two side walls of the lean combustion opening
115. The rectifying device 14 defines the first blind passage 116 and the second blind
passage 117 with the two side walls of the lean combustion opening 115 respectively,
nether the first blind passage 116 nor the second blind passage 117 is in communication
with the lean combustion cavity 1141. The first rich combustion flame port 118 may
be spaced apart from the plurality of lean combustion flame ports 141 through the
first blind passage 116, and the second rich combustion flame port 119 may be spaced
apart from the plurality of lean combustion flame ports 141 through the second blind
passage 117, thereby the flame structure being more stable, the emission of nitrogen
oxides in fume being effectively controlled.
[0039] Optionally, as shown in Fig. 8, a top surface of an outer side wall of the first
blind passage 116 is flush with a top surface of an outer side wall of the second
blind passage 117 and is higher than a top surface of the rectifying device 14. A
top surface of an outer side wall of the first rich combustion flame port 118 is flush
with that of the second rich combustion flame port 119 and is higher than the top
surface of the outer side wall of the first blind passage 116 and the top surface
of the outer side wall of the second blind passage 117. A height difference between
the top surface of the outer side wall of the first blind passage 116 and the top
surface of the rectifying device 14 and a height difference between the top surface
of the outer side wall of the second blind passage 117 and the top surface of the
rectifying device 14 are denoted by H1, and a height difference between the top surface
of the outer side wall of the first rich combustion flame port 118 and the top surface
of the rectifying device 14 and a height difference between the top surface of the
outer side wall of the second rich combustion flame port 119 and the top surface of
the rectifying device 14 are denoted by H2, in which H2≥H1, thereby facilitating control
of stability of the air flow at the rich combustion flame ports and the lean combustion
flame port 141, further improving the stability of the combustion flame.
[0040] Preferably, H2 and H1 may satisfy H2>H1, thereby further ensuing the stability of
the flames at the lean combustion flame port 141 and the rich combustion flame ports,
reducing the emission of nitrogen oxides in fume.
[0041] Advantageously, as shown in Fig. 8, the maximum width of the first blind passage
116 and the maximum width of the second blind passage 117 may be equal and denoted
by W2, the maximum width of the first rich combustion flame port 118 and the maximum
width of the second rich combustion flame port 119 are equal and denoted by W1, in
which W2≥W1, thereby further ensuring the structural stability of the combustion flames.
Specifically, with reference to Fig. 7 and Fig. 8, the maximum width of the first
rich combustion flame port 118 refers to the maximum width of a narrow side of the
first rich combustion flame port 118 along a left-right direction, the maximum width
of the second rich combustion flame port 119 refers to the maximum width of a narrow
side of the second rich combustion flame port 119 along the left-right direction.
The maximum width of the first blind passage 116 and the maximum width of the second
blind passage 117 refer to the maximum widths of narrow sides of the first blind passage
116 and the second blind passage 117 along the left-right direction respectively.
The maximum widths of narrow sides of the first blind passage 116 and the second blind
passage 117 are equal and configured to be W2, the maximum widths of narrow sides
of the first rich combustion flame port 118 and the second rich combustion flame port
119 are equal and configured to be W1, the maximum widths W2 of narrow sides of the
first blind passage 116 and the second blind passage 117 are larger than or equal
to the maximum widths W1 of narrow sides of the first rich combustion flame port 118
and the second rich combustion flame port 119.
[0042] In some embodiments of the present disclosure, the maximum width of the lean combustion
flame port 141 may be denoted by W3, a height of the rectifying device 14 may be denoted
by H, in which W3/H=0.03∼0.30. Specifically, as shown in Fig. 4 and Fig. 5, the rectifying
device 14 may include a plurality of rectifying plates. The plurality of rectifying
plates define a plurality of finedraw-type passages therebetween. The plurality of
lean combustion flame ports 141 are formed at a top of each finedraw-type passage.
In which, the maximum width W3 of the lean combustion flame port 141 refers to the
maximum width of a narrow side of a top opening of each finedraw-type passage along
the left-right direction, a height H of the rectifying device 14 refers to the height
of each finedraw-type passage, preferably, W3/H=0.05∼0.20. Thereby the structure stability
of the rich combustion flames and the lean combustion flames may be further ensured.
[0043] In some embodiments of the present disclosure, a ratio of the amount of air to that
of the fuel gas in theory for complete combustion of fuel gas may be denoted by Φ
S, a mixture ratio of the amount of air to that of the fuel gas at the rich combustion
injection port 131 may be denoted by Φ
R, in which, Φ
R/Φ
S=0.5∼0.8. Φ
R/Φ
S refers to a primary air ratio of the rich combustion. By designing a port area ratio
of the rich combustion injection port 131 to the lean combustion injection port 121,
the primary air ratios of the rich combustion and the lean combustion may be adjusted,
so that the fuel gas and the air are fully mixed and have a good combustion ratio,
so as to form the stable flame structure and reduce the emission of nitrogen oxides
in fume.
[0044] In some embodiments of the present disclosure, the ratio of the amount of air to
that of the fuel gas in theory for complete combustion of fuel gas may be denoted
by Φ
S, a mixture ratio of the amount of air to that of the fuel gas at the lean combustion
injection port 121 may be denoted by Φ
L, in which, Φ
L/Φ
S=1.5∼2.0. Φ
L/Φ
S refers to a primary air ratio of the lean combustion. By designing a port area ratio
of the rich combustion injection port 131 to the lean combustion injection port 121,
the primary air ratios of the rich combustion and the lean combustion may be adjusted,
so that the fuel gas and the air are fully mixed and have a good combustion ratio,
so as to form the stable flame structure and reduce the emission of nitrogen oxides
in fume.
[0045] In some embodiments of the present disclosure, as shown in Fig. 5, Fig. 7 and Fig.
8, the combustor shell 11 may include a first lean combustion shell portion 113, a
second lean combustion shell portion 114, a first rich combustion shell portion 111
and a second rich combustion shell portion 112. The first lean combustion shell portion
113 and the second lean combustion shell portion 114 are connected together and define
the lean combustion cavity 1141 and the lean combustion opening 115. The rectifying
device 14 is disposed between the first lean combustion shell portion 113 and the
second lean combustion shell portion 114 and located at the lean combustion opening
115.
[0046] The first rich combustion shell portion 111 is connected to the first lean combustion
shell portion 113 and is located outside of the first lean combustion shell portion
113. The first rich combustion shell portion 111 and the first lean combustion shell
portion 113 define the first rich combustion cavity 1111 and the first rich combustion
flame port 118 together. The second rich combustion shell portion 112 is connected
to the second lean combustion shell portion 114 and located outside of the second
lean combustion shell portion 114. The second rich combustion shell portion 112 and
the second lean combustion shell portion 114 define the second rich combustion cavity
1121 and the second rich combustion flame port 119 together.
[0047] As shown in Fig. 7 and Fig. 8, the first rich combustion flame port 118 and the second
rich combustion flame port 119 are located at two sides of the lean combustion opening
115 respectively. The rectifying device 14 is disposed at the lean combustion opening
115 and is provided with the plurality of lean combustion flame ports 141. The plurality
of lean combustion flame ports 141 are disposed at the top of the rectifying device
14. The first rich combustion flame port 118 and the second rich combustion flame
port 119 are located at two sides of the plurality of lean combustion flame ports
141 respectively, thereby facilitating formation of the stable flame structure having
the lean combustion flame in the middle and the rich combustion flames at both sides,
so as improving the stability of the flames, reducing the temperature of flames and
reducing the emission of nitrogen oxides.
[0048] Advantageously, the combustor shell 11 may further include a plurality of connecting
slats 17. Two ends of each connecting slat 17 are connected to the first rich combustion
shell portion 111 and the second rich combustion shell portion 112 respectively. The
plurality of connecting slats 17 divide each of the first rich combustion flame port
118, the second rich combustion flame port 119 and the lean combustion flame port
141 into a plurality of segments. Thus, the lean combustion flame and the rich combustion
flame may be divided into a plurality of segments, thereby increasing a heat dissipation
area of the flame and reducing the flame temperature.
[0049] Optionally, the combustor shell 11 may further include a lean combustion injector
12 and a rich combustion injector 13. The lean combustion injector 12 is connected
to the first lean combustion shell portion 113 and the second lean combustion shell
portion 114. The lean combustion injection port 121 is disposed on the lean combustor
100. The rich combustion injector 13 is connected to the first rich combustion shell
portion 111 and the second rich combustion shell portion 112 and is in communication
with the first rich combustion cavity 1111 and the second rich combustion cavity 1121.
The rich combustion injector 13 is located above the lean combustion injector 12,
and the rich combustion injection port 131 is disposed on the rich combustion injector
13. Thus, the fuel gas and the introduced air may be led to the first rich combustion
cavity 1111 and the second rich combustion cavity 1121 through the rich combustion
injector 13, the fuel gas and the air are mixed in the first rich combustion cavity
1111 and the second rich combustion cavity 1121, and the mixed gas is led to the first
rich combustion flame port 118 and the second rich combustion flame port 119. At the
same time, the fuel gas and the introduced air may be led to the lean combustion cavity
1141 through the lean combustion injector 12, the fuel gas and the air may be mixed
in the lean combustion cavity 1141 and the mixed gas and air may be led to the lean
combustion flame port 141.
[0050] In some embodiments of the present disclosure, the combustion unit 1 may further
include a rich combustion nozzle 15 and a lean combustion nozzle 16. The rich combustion
nozzle 15 may be configured to provide the rich combustion injection port 131 with
the fuel gas and the lean combustion nozzle 16 may be configured to provide the lean
combustion injection port 121 with the fuel gas. The rich combustion nozzle 15 is
in communication with the rich combustion injector 13 port and the lean combustion
nozzle 16 is in communication with the lean combustion injection port 121. Thus, the
fuel gas may be injected into the rich combustion injection port 131 through the rich
combustion nozzle 15. The fuel gas is mixed with the air introduced by the rich combustion
injector 13 and is led to the first rich combustion cavity 1111 and the second rich
combustion cavity 1121. The fuel gas may be injected into the lean combustion injection
port 121 through the lean combustion nozzle 16. The fuel gas is mixed with the air
introduced by the lean combustion injector 12 and is led to the lean combustion cavity
1141.
[0051] Optionally, a sectional area S3 of a gas jet port of the rich combustion nozzle 15
and a sectional area S4 of a gas jet port of the lean combustion nozzle 16 could satisfy:
S3/S4=0.25∼0.65. That is to say, the sectional area of the gas jet port of the rich
combustion nozzle 15 is 0.25-0.65 percent of the sectional area of the gas jet port
of the lean combustion nozzle 16. Thus, by designing the ratio of the sectional area
of the gas jet port of the rich combustion nozzle 15 to that of the lean combustion
nozzle 16, the ratio of the amount of fuel gas to that of the air for the rich combustion
and the lean combustion may be controlled, so that the amount of air introduced by
the lean combustion injection port 121 and the amount of fuel gas injected by the
lean combustion nozzle 16, as well as the amount of air introduced by the rich combustion
injection port 131 and the amount of fuel gas injected by the rich combustion nozzle
15 could have a good ratio, thereby the rich combustion and the lean combustion being
more sufficient, and the emission of nitrogen oxides being reduced.
[0052] Optionally, the combustor may further include a primary air adjusting plate, the
primary air adjusting plate is disposed in front of the rich combustion injection
port 131 and the lean combustion injection port 121 so as to adjust an amount of injection
air. Thus, the amount of air introduced in the rich combustion injection port 131
and the lean combustion injection port 121 may be adjusted through the primary air
adjusting plate, thereby a proportion of the amount of air to the fuel gas at the
rich combustion injection port 131 and the proportion of the amount of air to the
fuel gas at the lean combustion injection port 121 being further controlled.
[0053] Furthermore, the combustor may further include a secondary air adjusting plate, the
secondary air adjusting plate is disposed below the combustion unit 1, and the primary
air adjusting plate extends downwardly and defines a pressure balancing chamber between
the primary air adjusting plate and the secondary air adjusting plate. Specifically,
the primary air adjusting plate is disposed in front of the rich combustion injection
port 131 and the lean combustion injection port 121 to adjust the amount of injection
air, the secondary air adjusting plate is disposed below the combustion unit 1 to
adjust the air amount in a combustion chamber, a lower end of the primary air adjusting
plate extends downwardly and defines the pressure balancing chamber between the primary
air adjusting plate and the secondary air adjusting plate. In this way, air flow produced
by an air blower of the combustor flows to the rich combustion injection port 131
and the lean combustion injection port 121 through the pressure balancing chamber
21, so that primary air entering the rich combustion injection port 131 and the lean
combustion injection port 121 is more evenly, so as to improve the combustion effect.
[0054] A specific embodiment of the combustor according to embodiments of the present disclosure
will be described in detail with reference to drawings in the following. It should
be noted that, the following description is just explanatory and could not be construed
to limit the present disclosure.
[0055] As shown in Figs. 1-8, the combustor according to embodiments of the present disclosure
may include the plurality of combustion units 1, the primary air adjusting plate and
the secondary air adjusting plate, in which the plurality of combustion units 1 are
arranged side by side along the width direction of the combustion unit 1.
[0056] Specifically, each combustion unit 1 includes the combustor shell 11, the rectifying
device 14, the rich combustion injector 13, the lean combustion injector 12, the rich
combustion nozzle 15 and the lean combustion nozzle 16. As shown in Fig. 5, Fig. 7
and Fig. 8, the combustor shell 11 includes the first lean combustion shell portion
113, the second lean combustion shell portion 114, the first rich combustion shell
portion 111 and the second rich combustion shell portion 112. The first lean combustion
shell portion 113 and the second lean combustion shell portion 114 are connected together
and define the lean combustion cavity 1141 and the lean combustion opening 115. The
rectifying device 14 is disposed between the first lean combustion shell portion 113
and the second lean combustion shell portion 114 and located at the lean combustion
opening 115.
[0057] The first rich combustion shell portion 111 is connected to the first lean combustion
shell portion 113 and is located outside of the first lean combustion shell portion
113. The first rich combustion shell portion 111 and the first lean combustion shell
portion 113 define the first rich combustion cavity 1111 and the first rich combustion
flame port 118 together. The second rich combustion shell portion 112 is connected
to the second lean combustion shell portion 114 and located outside of the second
lean combustion shell portion 114. The second rich combustion shell portion 112 and
the second lean combustion shell portion 114 define the second rich combustion cavity
1121 and the second rich combustion flame port 119 together.
[0058] The first rich combustion flame port 118 and the second rich combustion flame port
119 are located at two sides of the lean combustion opening 115 respectively. The
rectifying device 14 is disposed at the lean combustion opening 115 and is provided
with the plurality of lean combustion flame ports 141. The plurality of lean combustion
flame ports 141 are disposed at the top of the rectifying device 14. The first rich
combustion flame port 118 and the second rich combustion flame port 119 are located
at two sides of the plurality of lean combustion flame ports 141 respectively, thereby
facilitating formation of the stable flame structure having the lean combustion flame
in the middle and the rich combustion flames at both sides, so as improving the stability
of the flames, reducing the temperature of flames and reducing the emission of nitrogen
oxides.
[0059] The lean combustion injector 12 is connected to the first lean combustion shell portion
113 and the second lean combustion shell portion 114. The lean combustion injection
port 121 is disposed on the lean combustor 100. The rich combustion injector 13 is
connected to the first rich combustion shell portion 111 and the second rich combustion
shell portion 112 and is in communication with the first rich combustion cavity 1111
and the second rich combustion cavity 1121. The rich combustion injector 13 is located
above the lean combustion injector 12, and the rich combustion injection port 131
is disposed on the rich combustion injector 13. Thus, the fuel gas and the introduced
air may be led to the first rich combustion cavity 1111 and the second rich combustion
cavity 1121 through the rich combustion injector 13, the fuel gas and the air are
mixed and led to the first rich combustion flame port 118 and the second rich combustion
flame port 119. At the same time, the fuel gas and the introduced air may be led to
the lean combustion cavity 1141 through the lean combustion injector 12, the fuel
gas and the air may be mixed led to the lean combustion flame port 141.
[0060] The rich combustion nozzle 15 may be configured to provide the rich combustion injection
port 131 with the fuel gas and the lean combustion nozzle 16 may be configured to
provide the lean combustion injection port 121 with the fuel gas. The rich combustion
nozzle 15 is in communication with the rich combustion injector 13 port. The lean
combustion nozzle 16 is in communication with the lean combustion injection port 121.
Thus, the fuel gas may be injected into the rich combustion injection port 131 through
the rich combustion nozzle 15. The fuel gas is mixed with the air introduced by the
rich combustion injector 13 and is led to the first rich combustion cavity 1111 and
the second rich combustion cavity 1121. The fuel gas may be injected into the lean
combustion injection port 121 through the lean combustion nozzle 16. The fuel gas
is mixed with the air introduced by the lean combustion injector 12 and is led to
the lean combustion cavity 1141.
[0061] The sectional area S1 of the rich combustion injection port 131 and the sectional
area S2 of the lean combustion injection port 121 satisfy: S1/S2=0.20∼0.40. The sectional
area S3 of the gas jet port of the rich combustion nozzle 15 and the sectional area
S4 of the gas jet port of the lean combustion nozzle 16 could satisfy: S3/S4=0.25∼0.65.
Thus, the ratio of the amount of air to that of fuel gas at the rich combustion injection
port 131 and the ratio of the amount of air to that of fuel gas at the lean combustion
injection port 121 may be controlled, and then the primary air ratio of the rich combustion
and the primary air ratio of the lean combustion may be further controlled.
[0062] The ratio of the amount of air to that of fuel gas in theory for a complete combustion
of fuel gas may be denoted by Φ
S, the mixture ratio of the amount of air to that of fuel gas at the rich combustion
injection port 131 may be denoted by Φ
R, and the mixture ratio of the amount of air to that of fuel gas at the lean combustion
injection port 121 may be denoted by Φ
L. The primary air ratio of the rich combustion is configured to be Φ
R/Φ
S and satisfies: Φ
R/Φ
S=0.5∼0.8, the primary air ratio of the lean combustion is configured to be Φ
L/Φ
S and satisfies: Φ
L/Φ
S=1.5∼2.0, so that the fuel gas and the air are mixed fully and have a good combustion
proportion, so as forming the stable flame structure and reducing the emission of
nitrogen oxides in fume.
[0063] As shown in Fig. 7 and Fig. 8, the first blind passage 116 and the second blind passage
117 may be defined between the rectifying device 14 and two side walls of the lean
combustion opening 115 respectively, the first blind passage 116 is located between
the first rich combustion flame port 118 and the plurality of lean combustion flame
ports 141, and the second blind passage 117 is located between the second rich combustion
flame port 119 and the plurality of lean combustion flame ports 141.
[0064] The top surface of the outer side wall of the first blind passage 116 is flush with
the top surface of the outer side wall of the second blind passage 117 and is higher
than the top surface of the rectifying device 14. The top surface of the outer side
wall of the first rich combustion flame port 118 is flush with the top surface of
the outer side wall of the second rich combustion flame port 119 and is higher than
the top surface of the outer side wall of the first blind passage 116 and the top
surface of the outer side wall of the second blind passage 117. The height difference
between the top surface of the outer side wall of the first blind passage 116 and
the top surface of the rectifying device 14 and the height difference between the
top surface of the outer side wall of the second blind passage 117 and the top surface
of the rectifying device 14 are denoted by H1, and the height difference between the
top surface of the outer side wall of the first rich combustion flame port 118 and
the top surface of the rectifying device 14 and the height difference between the
top surface of the outer side wall of the second rich combustion flame port 119 and
the top surface of the rectifying device 14 are denoted by H2, the maximum width of
the first blind passage 116 and the maximum width of the second blind passage 117
are equal and may be denoted by W2, the maximum width of the first rich combustion
flame port 118 and the maximum width of the second rich combustion flame port 119
are equal and may be denoted by W1, in which H2≥H1, W2≥W1, thereby facilitating control
of stability of the air flow at the rich combustion flame ports and the lean combustion
flame port 141, further improving the stability of the combustion flame.
[0065] The maximum width of the lean combustion flame port 141 may be denoted by W3, and
the height of the rectifying device 14 may be denoted by H, in which, W3/H=0.03∼0.30,
and preferably, W3/H=0.05∼0.20, thereby the structural stability of the rich combustion
flame and the lean combustion flame may be further ensured.
[0066] The primary air adjusting plate may be disposed in front of the rich combustion injection
port 131 and the lean combustion injection port 121 of each combustion unit 1, so
as to adjust the amount of injection air. Thus, the amount of air introduced from
the rich combustion injection port 131 and the lean combustion injection port 121
of each the combustion unit 1 may be adjusted through the primary air adjusting plate,
thereby the proportion of the amount of air to that of fuel gas at the rich combustion
injection port 131 and the proportion of the amount of air to that of fuel gas at
the lean combustion injection port 121 being further controlled.
[0067] The secondary air adjusting plate is disposed below the combustion unit 1 to adjust
the amount of air in the combustion chamber, the primary air adjusting plate extends
downwardly and defines a pressure balancing chamber between the primary air adjusting
plate and the secondary air adjusting plate. The air flow produced by the air blower
of the gas water heater flows to the rich combustion injection port 131 and the lean
combustion injection port 121 through the pressure balancing chamber, so that primary
air entering the rich combustion injection port 131 and the lean combustion injection
port 121 is more evenly, so as to improve the combustion effect.
[0068] Thus, in the combustor according to embodiments of the present disclosure, the first
rich combustion flame port 118 and the second rich combustion flame port 119 of the
combustion unit 1 are located at two sides of the plurality of lean combustion flames
141, so as to form the stable flame structure having the lean combustion flame in
the middle and the rich combustion flame at the both sides, reducing the flame temperature
and controlling emission of the nitrogen oxides in the fume after the combustion.
Moreover the sectional area S1 of the rich combustion injection port 131 and the sectional
area S2 of the lean combustion injection port 121 of the combustor satisfy: S1/S2=0.20∼0.40,
and the sectional area S3 of the gas jet port of the rich combustion nozzle 15 and
the sectional area S4 of the gas jet port of the lean combustion nozzle 16 satisfy:
S3/S4=0.25∼0.65. The structure of the combustor shell 11 and the primary air ratio
of the rich combustion and the lean combustion are defined, thereby achieving a good
proportion of the air introduced by the rich combustion injection port 131 and the
lean combustion injection port 121 to the fuel gas, further controlling the structural
stability of the combustion flame and reducing the emission of nitrogen oxides.
[0069] In addition, a gas water heater having the combustor according to the above embodiments
is further provided by the present disclosure.
[0070] As the combustor according to the above embodiments of the present disclosure has
the above technical effects, hence the gas water heater according to embodiments of
the present disclosure also has the above technical effects. That is to say, the gas
water heater according to embodiments of the present disclosure is provided with the
combustor according to the above embodiments, thereby the stability of flame structure
may be improved, the temperature of the flame may be reduced and the emission of nitrogen
oxides in fume of the gas water heater may be reduced.
[0071] In the present invention, unless specified or limited otherwise, a structure in which
a first feature is "on" or "below" a second feature may include an embodiment in which
the first feature is in direct contact with the second feature, and may also include
an embodiment in which the first feature and the second feature are not in direct
contact with each other, but are contacted via an additional feature formed therebetween.
Furthermore, a first feature "on," "above," or "on top of' a second feature may include
an embodiment in which the first feature is right or obliquely "on," "above," or "on
top of' the second feature, or just means that the first feature is at a height higher
than that of the second feature; while a first feature "below," "under," or "on bottom
of' a second feature may include an embodiment in which the first feature is right
or obliquely "below," "under," or "on bottom of' the second feature, or just means
that the first feature is at a height lower than that of the second feature.
[0072] Reference throughout this specification to "an embodiment," "some embodiments," "one
embodiment", "another example," "an example," "a specific example," or "some examples,"
means that a particular feature, structure, material, or characteristic described
in connection with the embodiment or example is included in at least one embodiment
or example of the present disclosure. Thus, the appearances of the phrases such as
"in some embodiments," "in one embodiment", "in an embodiment", "in another example,"
"in an example," "in a specific example," or "in some examples," in various places
throughout this specification are not necessarily referring to the same embodiment
or example of the present disclosure. Furthermore, the particular features, structures,
materials, or characteristics may be combined in any suitable manner in one or more
embodiments or examples.
[0073] Although explanatory embodiments have been shown and described, it would be appreciated
by those skilled in the art that the above embodiments cannot be construed to limit
the present disclosure, and changes, alternatives, and modifications can be made in
the embodiments without departing from spirit, principles and scope of the present
disclosure.
1. A combustor comprising at least one combustion unit, the combustion unit comprising:
a combustor shell, wherein the combustor shell defines a first rich combustion cavity,
a second rich combustion cavity and a lean combustion cavity therein, and the combustor
shell is provided with a rich combustion injection port in communication with the
first rich combustion cavity and the second rich combustion cavity, a lean combustion
injection port in communication with the lean combustion cavity, a first rich combustion
flame port in communication with the first rich combustion cavity, a second rich combustion
flame port in communication with the second rich combustion cavity and a lean combustion
opening in communication with the lean combustion cavity thereon; and
a rectifying device, disposed in the lean combustion opening and provided with a plurality
of lean combustion flame ports in communication with the lean combustion cavity, wherein
the first rich combustion flame port and the second rich combustion flame port are
located at two sides of the plurality of lean combustion flame ports respectively;
wherein a sectional area S1 of the rich combustion injection port and a sectional
area S2 of the lean combustion injection port satisfy: S1/S2=0.20∼0.40.
2. The combustor according to claim 1, wherein a first blind passage and a second blind
passage are defined between the rectifying device and two side walls of the lean combustion
opening respectively, wherein the first blind passage is located between the first
rich combustion flame port and the plurality of lean combustion flame ports, and the
second blind passage is located between the second rich combustion flame port and
the plurality of lean combustion flame ports.
3. The combustor according to claim 2, wherein a top surface of an outer side wall of
the first blind passage is flush with a top surface of an outer side wall of the second
blind passage and higher than a top surface of the rectifying device, a top surface
of an outer side wall of the first rich combustion flame port is flush with a top
surface of an outer side wall of the second rich combustion flame port and higher
than the top surface of the outer side wall of the first blind passage and the top
surface of the outer side wall of the second blind passage, a height difference between
the top surface of the outer side wall of the first blind passage and the top surface
of the rectifying device and a height difference between the top surface of the outer
side wall of the second blind passage and the top surface of the rectifying device
are denoted by H1, and a height difference between the top surface of the outer side
wall of the first rich combustion flame port and the top surface of the rectifying
device and a height difference between the top surface of the outer side wall of the
second rich combustion flame port and the top surface of the rectifying device are
denoted by H2, wherein H2 ≥H1.
4. The combustor according to claim 2, wherein the maximum width of the first blind passage
and the maximum width of the second blind passage are equal and denoted by W2, and
the maximum width of the first rich combustion flame port and the maximum width of
the second rich combustion flame port are equal and denoted by W1, wherein W2≥W1.
5. The combustor according to claim 1, wherein the maximum width of the lean combustion
flame port is denoted by W3 and a height of the rectifying device is denoted by H,
wherein W3/H=0.03∼0.30.
6. The combustor according to claim 1, wherein a ratio of the amount of air to that of
fuel gas in theory for complete combustion of fuel gas is denoted by ΦS and a mixture ratio of the amount of air to that of fuel gas at the rich combustion
injection port is denoted by ΦR, wherein ΦR/ΦS=0.5∼0.8.
7. The combustor according to claim 1, wherein the ratio of the amount of air to that
of fuel gas in theory for complete combustion of fuel gas is denoted by ΦS, a mixture ratio of the amount of air to that of fuel gas at the lean combustion
injection port is denoted by ΦL, wherein ΦL/ΦS =1.5∼2.0.
8. The combustor according to any one of claims 1-7, wherein the combustor shell comprises:
a first lean combustion shell portion and a second lean combustion shell portion,
wherein the first lean combustion shell portion and the second lean combustion shell
portion are connected together and define the lean combustion cavity and the lean
combustion opening, and the rectifying device is disposed between the first lean combustion
shell portion and the second lean combustion shell portion and located at the lean
combustion opening; and
a first rich combustion shell portion and a second rich combustion shell portion,
wherein the first rich combustion shell portion is connected to the first lean combustion
shell portion and located outside of the first lean combustion shell portion, the
first rich combustion shell portion and the first lean combustion shell portion define
the first rich combustion cavity and the first rich combustion flame port together,
the second rich combustion shell portion is connected to the second lean combustion
shell portion and located outside of the second lean combustion shell portion, the
second rich combustion shell portion and the second lean combustion shell portion
define the second rich combustion cavity and the second rich combustion flame port
together.
9. The combustor according to claim 8, wherein the combustor shell further comprises:
a plurality of connecting slats, wherein two ends of each connecting slat are connected
to the first rich combustion shell portion and the second rich combustion shell portion
respectively, and the plurality of connecting slats divide each of the first rich
combustion flame port, the second rich combustion flame port and the lean combustion
flame port into a plurality of segments.
10. The combustor according to claim 8, wherein the combustor shell further comprises:
a lean combustion injector, connected to the first lean combustion shell portion and
the second lean combustion shell portion, wherein the lean combustion injection port
is disposed on the lean combustion injector; and
a rich combustion injector, connected to the first rich combustion shell portion and
the second rich combustion shell portion and in communication with the first rich
combustion cavity and the second rich combustion cavity, wherein the rich combustion
injector is located above the lean combustion injector and the rich combustion injection
port is disposed on the rich combustion injector.
11. The combustor according to any one of claims 1-7, wherein the combustion unit further
comprises:
a rich combustion nozzle configured to provide the rich combustion injection port
with the fuel gas and corresponding to the rich combustion injection port; and
a lean combustion nozzle configured to provide the lean combustion injection port
with the fuel gas and corresponding to the lean combustion injection port.
12. The combustor according to claim 11, wherein a sectional area S3 of a gas jet port
of the rich combustion nozzle and a sectional area S4 of a gas jet port of the lean
combustion nozzle satisfy: S3/S4=0.25∼0.65.
13. The combustor according to any one of claims 1-7, wherein a plurality of combustion
units are provided and arranged along a width direction of the combustion unit.
14. A gas water heater comprising the combustor according to any one of claims 1-13.