CN114791106A - Cyclone burner with multi-channel primary air - Google Patents
Cyclone burner with multi-channel primary air Download PDFInfo
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- CN114791106A CN114791106A CN202210545932.9A CN202210545932A CN114791106A CN 114791106 A CN114791106 A CN 114791106A CN 202210545932 A CN202210545932 A CN 202210545932A CN 114791106 A CN114791106 A CN 114791106A
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- 239000000843 powder Substances 0.000 claims description 166
- 238000002485 combustion reaction Methods 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 239000003245 coal Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 108091006146 Channels Proteins 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000010992 reflux Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
A cyclone burner with multi-channel primary air relates to the technical field of burners. The problem that the combustion stability is poor due to the fact that a large-size central backflow area is formed at the outlet of a cyclone burner is not facilitated because secondary air volume is reduced mainly under the condition of load reduction of an existing burner is solved. When the peak load of the boiler is regulated and the load is reduced, all levels of channels in the primary air are closed step by step from the center of the combustor along the radial direction outwards, the flow cross section and the position of the primary air are changed under the condition that the primary air speed is basically unchanged, the closed partial primary air channels play a role of a blunt body at the center of the combustor, a negative pressure area is generated at the center of the combustor, and the formation of a central backflow area is promoted, so that the effect of swirling secondary air reduction on the backflow area is counteracted, the high-temperature smoke in the boiler is favorably sucked to heat pulverized coal airflow, and the boiler has good stable combustion performance when in low-load operation. The invention is suitable for the technical field of combustors.
Description
Technical Field
The invention relates to the technical field of combustors, in particular to a cyclone combustor with multiple channels in primary air.
Background
In 2021, the nation proposes a technical route of carbon peak reaching and carbon neutralization, and develops new energy resources vigorously, which requires a coal-fired power plant to do deep peak regulation work, so that a power plant boiler needs to meet the technical requirement of stable combustion at low load. In a hedging power station, a cyclone burner is generally adopted, the load of a boiler is reduced, and in order to ensure normal conveying of pulverized coal, the primary air volume is kept unchanged or slightly reduced, and is mainly adjusted by reducing the secondary air volume. The secondary air is usually rotational flow air, and the rotation capability is reduced due to the reduction of the air quantity, so that a backflow area is not favorably formed, and the stability is weak. At present, the minimum load of the utility boiler is adjusted to be about 30 percent. In order to further improve the peak shaving capability of the coal-fired power plant, it is necessary to develop a burner which can still form a rotational flow of a stable backflow zone under ultra-low load, so that the boiler can stably burn in a full-load section.
For the load reduction situation, the main problem is that the secondary air volume is reduced, which is not beneficial to the formation of a large-size central backflow area at the outlet of the cyclone burner, and is therefore not beneficial to the stable combustion. There are a number of patents disclosed to address this problem. For example, patent numbers CN201110302031.9, publication date of 2012, 06, 20, application publication number C102506425A, hereinafter referred to as "prior art one" of the invention "a central powder feeding cyclone pulverized coal burner with a central air pipe" are patent numbers CN201110302031.9, and application publication number C102506425A), a central air pipe is arranged at the center of a primary air pipe of the cyclone burner, and low-speed central air is introduced into the pipe, so that a negative pressure region in the central region of the burner is facilitated. The size of the backflow area is adjusted by changing the central air volume and the central air speed. Although the mode can solve the problems of reduction of the central reflux area, reduction of the retention time of the pulverized coal and the like caused by reduction of the secondary air volume, the secondary air can be reduced in entrainment capacity to the primary air and is not beneficial to formation of the central reflux area because the undershoot momentum of the primary air is basically unchanged and the momentum reduction of the secondary air is obvious in ultra-low load.
The invention discloses a combustor capable of adjusting secondary cyclone wind speed, which is characterized in that the patent number is CN202010841620.3, the patent publication date is 2020, 11 and 27, the application publication number is CN111998337A, and the combustor is called as 'the second prior art'), the flow cross section of the secondary cyclone wind is adjusted in the process of load change, so that the secondary cyclone wind can keep higher wind speed and rotation degree in the process of load reduction, and the combustion effect in a furnace is improved. However, the invention only changes the flow cross-sectional area of the outer secondary air, the inner secondary air is separated between the primary air and the outer secondary air, under the condition that the air quantity of the inner secondary air is sharply reduced under ultra-low load, the carrying effect of the primary air by changing the flow cross-sectional area of the outer secondary air is possibly not obvious, and the primary air possibly 'scatters' the central reflux area, so that the combustion stabilizing effect is poor.
In conclusion, the existing burner mainly has the problems that the secondary air volume is reduced under the condition of load reduction, and a large-size central backflow area is not formed at the outlet of the cyclone burner, so that the combustion stability is poor.
Disclosure of Invention
The invention provides a cyclone burner with multiple channels in primary air, aiming at solving the problem that the secondary air volume is reduced mainly under the condition of reducing load, which is not beneficial to forming a large-size central reflux area at the outlet of the cyclone burner, so that the combustion stability is poor.
The invention relates to a cyclone burner with multi-channel primary air, which comprises a multi-stage primary air channel, an inner secondary air channel, an outer secondary air channel, a powder feeding pipeline, a powder feeding control valve and a powder feeding bin, wherein the inner secondary air channel is communicated with the inner secondary air channel;
the output end of the powder feeding pipeline is connected with the input end of the multistage primary air channel, the outer surface of the output end of the multistage primary air channel is sleeved with the inner secondary air channel, the outer surface of the inner secondary air channel is sleeved with the outer secondary air channel, the outer surface of the input end of the powder feeding pipeline is provided with a through hole, the inner wall of the through hole is connected with the output end of the powder feeding bin, and the output end of the powder feeding bin is provided with a powder feeding control valve;
furthermore, the multistage primary air channel, the inner secondary air channel and the outer secondary air channel are coaxially arranged;
furthermore, the multistage primary air channels comprise a primary air channel, a secondary primary air channel, a tertiary primary air channel, a quaternary primary air channel, a quinary primary air channel, a heptaary primary air channel, an octave primary air channel, a nine-stage primary air channel and a ten-stage primary air channel;
the outer surface of the primary air channel is sequentially sleeved with a secondary primary air channel, a tertiary primary air channel, a quaternary primary air channel, a quinary primary air channel, an octave primary air channel, a nine-level primary air channel and a ten-level primary air channel, and the primary air channels are coaxially arranged;
further, inner secondary air swirl blades are arranged inside the inner secondary air channel;
further, an outer secondary air swirling flow blade is arranged inside the outer secondary air channel;
further, the powder feeding pipeline comprises a first-level powder feeding pipeline, a second-level powder feeding pipeline, a third-level powder feeding pipeline, a fourth-level powder feeding pipeline, a fifth-level powder feeding pipeline, a sixth-level powder feeding pipeline, a seventh-level powder feeding pipeline, an eight-level powder feeding pipeline, a nine-level powder feeding pipeline and a ten-level powder feeding pipeline;
the outer surface of the first-stage powder feeding pipeline is sequentially sleeved with a second-stage powder feeding pipeline, a third-stage powder feeding pipeline, a fourth-stage powder feeding pipeline, a fifth-stage powder feeding pipeline, a sixth-stage powder feeding pipeline, a seventh-stage powder feeding pipeline, an eight-stage powder feeding pipeline, a nine-stage powder feeding pipeline and a ten-stage powder feeding pipeline which are coaxially arranged;
furthermore, the inner walls of the output ends of the first-stage powder feeding pipeline, the second-stage powder feeding pipeline, the third-stage powder feeding pipeline, the fourth-stage powder feeding pipeline, the fifth-stage powder feeding pipeline, the sixth-stage powder feeding pipeline, the seventh-stage powder feeding pipeline, the eight-stage powder feeding pipeline, the nine-stage powder feeding pipeline and the ten-stage powder feeding pipeline are respectively provided with a baffle;
furthermore, the output end of the first-stage powder feeding pipeline is connected with the input end of the first-stage primary air channel, the output end of the second-stage powder feeding pipeline is connected with the input end of the second-stage primary air channel, the output end of the third-stage powder feeding pipeline is connected with the input end of the third-stage primary air channel, the output end of the fourth-stage powder feeding pipeline is connected with the input end of the fourth-stage primary air channel, the output end of the fifth-stage powder feeding pipeline is connected with the input end of the fifth-stage primary air channel, the output end of the sixth-stage powder feeding pipeline is connected with the input end of the sixth-stage primary air channel, the output end of the seventh-stage powder feeding pipeline is connected with the input end of the seventh-stage primary air channel, the output end of the eighth-stage powder feeding pipeline is connected with the input end of the eighth-stage primary air channel, the output end of the ninth-stage powder feeding pipeline is connected with the input end of the ninth-stage primary air channel, and the output end of the tenth-stage powder feeding pipeline is connected with the input end of the tenth-stage primary air channel;
furthermore, the cross-sectional areas of the outer walls of the primary air ventilating ducts of each two stages in the multi-stage primary air channel are the same;
furthermore, the cross-sectional areas between the outer walls of every two stages of powder feeding pipelines in the powder feeding pipelines are the same;
furthermore, when the boiler runs at full load, all the channels in the multistage primary air channel are opened, at the moment, the air speed of the rotational flow secondary air is high, the rotational flow strength is high, and the condition that a central backflow area is formed at the outlet of the combustor can be ensured. When the load of the boiler is reduced, the powder feeding amount is reduced, and a primary air channel, a secondary air channel, a tertiary air channel, a quaternary air channel, a fifth air channel, a sixth air channel, a seventh air channel, an eighth air channel, a ninth air channel and a tenth air channel are sequentially closed outwards along the radial direction from the center of the burner by adjusting a baffle plate on the inner wall of the output end of each primary air channel;
the lowest load of the invention is 10% of full load, at this time, only ten levels of primary air channels are opened. In addition, in the process of adjusting the valve, the wind speed and the design value in the ten-level primary air channel and the ten-level powder feeding pipeline are required to be unchanged, so that the powder feeding pipeline and the primary air channel cannot be blocked; in addition, the number of the channels arranged in the multi-stage primary air channel is not limited to be more than three, and the number of the multi-stage channels can be adjusted according to the actual required condition of the boiler.
Compared with the prior art, the invention has the following beneficial effects:
compared with the prior art, the invention closes each stage of channels in the primary air from the center of the burner outwards in the radial direction step by step under the condition that the negative swirl secondary air quantity of the boiler is reduced, reduces the flow cross section of the primary air, and reduces the primary air quantity under the condition that the primary air speed is not changed, so that the momentum of the primary air is reduced, the primary air is easier to be carried by the swirl secondary air, and a stable backflow area is easier to form. In addition, the closed part of the primary air channel is not ventilated, and the closed part of the primary air channel plays a role of a blunt body at the outlet center position of the cyclone burner. The lower the load is, the more the closed channels are, the larger the size of the blunt body at the center of the outlet of the burner is, so that the negative pressure area of the central area is increased, a central backflow area with a large size is formed at the center, the influence on the central backflow area due to the reduction of secondary air volume is counteracted, a large amount of high-temperature flue gas in the boiler is sucked to the outlet of the burner to heat pulverized coal airflow, and the stable combustion performance of the boiler is improved. The invention ensures that the primary air channel opened at low load and the air speed in the powder feeding pipeline are basically kept unchanged, so the mode can avoid the phenomenon of powder blockage in the pipeline;
in the second prior art, in the process of load reduction of a boiler, the total air volume sent to a combustor is gradually reduced, and the air volume of corresponding rotational flow secondary air is also gradually reduced. Because when the burner is operated, the secondary air in the rotational flow is closer to the primary air, the primary air is firstly mixed with the secondary air in the rotational flow and then mixed with the secondary air outside the rotational flow, therefore, at the initial stage of the flow development of the burner outlet, compared with the secondary air outside the rotational flow, the secondary air in the rotational flow has larger influence on the primary air, and the secondary air outside the rotational flow has larger influence on the primary air at the later stage of the flow. The larger the degree of outward diffusion of the primary air carried by the rotational flow secondary air roll is, the more favorable the formation of a central backflow area is. At ultra-low load, the inner secondary air and the outer secondary air of the rotational flow are sharply reduced. In the initial flowing stage, the entrainment capacity of the inner secondary air to the primary air is sharply reduced, and at the moment, the influence on a backflow area in the initial flowing stage of the outlet of the combustor is less by adjusting the wind speed of the outer secondary air;
compared with the prior art II, when the secondary air quantity is reduced and the channels at all levels in the primary air are gradually closed, the position of the primary air injected into the hearth is gradually close to the secondary air from the center along the radial direction, so that the primary air is more easily carried by the rotational flow secondary air to diffuse and flow outwards along the radial direction, the formation of a backflow area at the center area of the outlet of the burner is promoted, and the stability of the boiler in ultra-low load operation is favorably improved.
Drawings
FIG. 1 is a front sectional view of a cyclone burner with multiple passes for primary air according to the present invention;
FIG. 2 is an enlarged partial view of section A of a cyclone burner with multiple passes for the primary air illustrated in FIG. 1;
fig. 3 is a side sectional view B-B of a cyclone burner with multiple passes for primary air as described in fig. 1.
Detailed Description
The first specific implementation way is as follows: the embodiment is described with reference to fig. 1, and the cyclone burner with multi-channel primary air in the embodiment specifically comprises a multi-stage primary air channel 1, an inner secondary air channel 2, an outer secondary air channel 3, a powder feeding pipeline 4, a powder feeding control valve 5 and a powder feeding bin 6;
the output end of the powder feeding pipeline 4 is connected with the input end of the multistage primary air channel 1, an inner secondary air channel 2 is sleeved on the outer surface of the output end of the multistage primary air channel 1, an outer secondary air channel 3 is sleeved on the outer surface of the inner secondary air channel 2, a through hole is formed in the outer surface of the input end of the powder feeding pipeline 4, the inner wall of the through hole is connected with the output end of the powder feeding bin 6, and a powder feeding control valve 5 is arranged at the output end of the powder feeding bin 6;
according to the specific embodiment, when the boiler runs at full load, all the channels in the multistage primary air channel 1 are opened, at the moment, the air speed of the rotational flow secondary air is high, the rotational flow strength is high, and the condition that a central backflow area is formed at the outlet of the combustor can be ensured. When the load of the boiler is reduced, the powder feeding amount is reduced, and a plurality of air channels in the multi-stage primary air channel 1 are sequentially closed from the center of the combustor to the outside along the radial direction by adjusting the baffle plates 4-11 on the inner wall of the output end of each stage of primary air channel;
the lowest load of the invention is 10% of full load, and at the moment, only ten-level primary air channels 1-10 are opened. In addition, in the process of adjusting the valve, the wind speed in the ten-level primary air channel 1-10 and the wind speed in the ten-level powder feeding pipeline 4-10 are ensured to be unchanged from the design value, so that the powder feeding pipeline and the primary air channel cannot be blocked; in addition, the number of the channels arranged in the multi-stage primary air channel is not limited to be more than 3, and the number of the multi-stage channels can be adjusted according to the actual required condition of the boiler.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 1, and is further limited to the cyclone burner according to the first embodiment, and the cyclone burner according to the present embodiment is a cyclone burner with a primary air flow having a plurality of passages, and the multistage primary air passage 1, the inner secondary air passage 2, and the outer secondary air passage 3 are coaxially disposed.
The third concrete implementation mode: the present embodiment is described with reference to fig. 1, and is further limited to the cyclone burner according to the first embodiment, and the cyclone burner according to the first embodiment is provided with multiple primary air channels, and the multistage primary air channel 1 includes a primary air channel 1-1, a secondary primary air channel 1-2, a tertiary primary air channel 1-3, a quaternary primary air channel 1-4, a quintuple primary air channel 1-5, a sextuple primary air channel 1-6, a seventeenth primary air channel 1-7, an octagon primary air channel 1-8, a nine-stage primary air channel 1-9, and a ten-stage primary air channel 1-10;
the outer surface of the primary air channel 1-1 is sequentially sleeved with a secondary primary air channel 1-2, a tertiary primary air channel 1-3, a quaternary primary air channel 1-4, a quinary primary air channel 1-5, a hexabasic primary air channel 1-6, a heptabasic primary air channel 1-7, an octabasic primary air channel 1-8, a nonabasic primary air channel 1-9 and a decabasic primary air channel 1-10, and the primary air channels are coaxially arranged;
in the specific embodiment, ten air channels are arranged in the multi-stage primary air channel 1, when the secondary air quantity is reduced, in the process of gradually closing each stage of channel in the multi-stage primary air channel, the position of the primary air injected into the hearth is gradually close to the secondary air from the center along the radial direction, so that the primary air is more easily carried by the rotational flow secondary air to flow in a radially outward diffusion mode, the formation of a backflow area in the central area of the outlet of the combustor is promoted, and the stable combustion performance of the boiler during the ultra-low load operation is favorably improved.
The fourth concrete implementation mode: the present embodiment will be described with reference to fig. 1, and is further limited to the cyclone burner according to the first embodiment, which is a cyclone burner with multi-pass primary air, and the inner secondary air swirl vanes 2-1 are provided in the inner secondary air duct 2.
The fifth concrete implementation mode: the present embodiment will be described with reference to fig. 1, and is further limited to the cyclone burner according to the first embodiment, in which the outer overfire air swirl vanes 3-1 are provided inside the outer overfire air duct 3.
The sixth specific implementation mode is as follows: the present embodiment is described with reference to fig. 1 and 3, and is further limited to the cyclone burner according to the first embodiment, and the cyclone burner according to the present embodiment is provided with multiple channels for the primary air, and the powder supply duct 4 includes a first-stage powder supply duct 4-1, a second-stage powder supply duct 4-2, a third-stage powder supply duct 4-3, a fourth-stage powder supply duct 4-4, a fifth-stage powder supply duct 4-5, a sixth-stage powder supply duct 4-6, a seventh-stage powder supply duct 4-7, an eighth-stage powder supply duct 4-8, a ninth-stage powder supply duct 4-9, and a tenth-stage powder supply duct 4-10;
the outer surface of the first-stage powder feeding pipeline 4-1 is sequentially sleeved with a second-stage powder feeding pipeline 4-2, a third-stage powder feeding pipeline 4-3, a fourth-stage powder feeding pipeline 4-4, a fifth-stage powder feeding pipeline 4-5, a sixth-stage powder feeding pipeline 4-6, a seventh-stage powder feeding pipeline 4-7, an eighth-stage powder feeding pipeline 4-8, a ninth-stage powder feeding pipeline 4-9 and a tenth-stage powder feeding pipeline 4-10 which are coaxially arranged.
The seventh concrete implementation mode: the present embodiment is described with reference to fig. 1, fig. 2 and fig. 3, and is further limited to the cyclone burner according to the sixth embodiment, and the cyclone burner according to the sixth embodiment is provided with multiple channels for the primary air, wherein the inner walls of the output ends of the first-stage powder feeding pipeline 4-1, the second-stage powder feeding pipeline 4-2, the third-stage powder feeding pipeline 4-3, the fourth-stage powder feeding pipeline 4-4, the fifth-stage powder feeding pipeline 4-5, the sixth-stage powder feeding pipeline 4-6, the seventh-stage powder feeding pipeline 4-7, the eighth-stage powder feeding pipeline 4-8, the ninth-stage powder feeding pipeline 4-9 and the tenth-stage powder feeding pipeline 4-10 are respectively provided with a baffle 4-11;
according to the specific embodiment, by adopting the structure, when the load of the boiler is reduced, the powder feeding amount is reduced by adjusting the baffle plates 4-11 on the inner wall of the output end of each stage of primary air channel.
The specific implementation mode eight: the present embodiment is described with reference to fig. 1, which is a cyclone burner with multiple channels for the primary air, the output end of the primary powder supply pipeline 4-1 is connected to the input end of the primary air channel 1-1, the output end of the secondary powder supply pipeline 4-2 is connected to the input end of the secondary primary air channel 1-2, the output end of the tertiary powder supply pipeline 4-3 is connected to the input end of the tertiary primary air channel 1-3, the output end of the quaternary powder supply pipeline 4-4 is connected to the input end of the quaternary primary air channel 1-4, the output end of the quinary powder supply pipeline 4-5 is connected to the input end of the quinary primary air channel 1-5, and the output end of the quinary powder supply pipeline 4-6 is connected to the input end of the quinary primary air channel 1-6, the output end of the seven-level powder feeding pipeline 4-7 is connected with the input end of the seven-level primary air channel 1-7, the output end of the eight-level powder feeding pipeline 4-8 is connected with the input end of the eight-level primary air channel 1-8, the output end of the nine-level powder feeding pipeline 4-9 is connected with the input end of the nine-level primary air channel 1-9, and the output end of the ten-level powder feeding pipeline 4-10 is connected with the input end of the ten-level primary air channel 1-10.
The specific implementation method nine: the present embodiment will be described with reference to fig. 1, which is a further limitation of the cyclone burner of the third embodiment, and in the cyclone burner of the present embodiment, the primary air ducts have the same cross-sectional area between the outer walls of the primary air ducts of each two stages in the multistage primary air duct 1.
The specific implementation mode is ten: the present embodiment will be described with reference to fig. 3, which is a further limitation of the cyclone burner according to the sixth embodiment, and the cyclone burner according to the present embodiment is a cyclone burner with multiple primary air channels, and the cross-sectional areas of the outer walls of the two stages of the powder feeding ducts 4 are the same.
Principle of operation
When the boiler runs at full load, all the channels in the multistage primary air channel 1 are opened, at the moment, the air speed of the rotational flow secondary air is high, the rotational flow strength is high, and the condition that a central backflow area is formed at the outlet of the combustor can be ensured. When the load of the boiler is reduced, the powder feeding amount is reduced, and a first-stage primary air channel 1-1, a second-stage primary air channel 1-2, a third-stage primary air channel 1-3, a fourth-stage primary air channel 1-4, a fifth-stage primary air channel 1-5, a sixth-stage primary air channel 1-6, a seventh-stage primary air channel 1-7, an eighth-stage primary air channel 1-8, a ninth-stage primary air channel 1-9 and a tenth-stage primary air channel 1-10 are sequentially closed outwards along the radial direction from the center of the combustor by adjusting a baffle 4-11 on the inner wall of the output end of each-stage primary air channel;
the lowest load of the invention is 10% of full load, at this time, only ten levels of primary air channels 1-10 are opened. In addition, in the process of adjusting the valve, the wind speeds in the ten-level primary air channel 1-10 and the ten-level powder feeding pipeline 4-10 are required to be ensured to be unchanged from the design values, so that the powder feeding pipeline and the primary air channel cannot be blocked; in addition, the number of the channels arranged in the multi-stage primary air channel is not limited to be more than three, and the number of the multi-stage channels can be adjusted according to the actual required condition of the boiler.
Claims (10)
1. A cyclone burner with multi-channel primary air is characterized in that: the powder feeder comprises a multi-stage primary air channel (1), an inner secondary air channel (2), an outer secondary air channel (3), a powder feeding pipeline (4), a powder feeding control valve (5) and a powder feeding bin (6);
the output of giving powder pipeline (4) is connected with the input of multistage primary air passageway (1), and the cover is equipped with interior overgrate air passageway (2) on the output surface of multistage primary air passageway (1), the cover is equipped with outer overgrate air passageway (3) on the surface of interior overgrate air passageway (2), be equipped with the through-hole on the surface of the input of giving powder pipeline (4), and this through-hole inner wall is connected with the output of giving powder storehouse (6), and be equipped with on the output of giving powder storehouse (6) and give powder control valve (5).
2. A cyclone burner with multi-pass for primary air according to claim 1, characterized in that: the multi-stage primary air channel (1), the inner secondary air channel (2) and the outer secondary air channel (3) are coaxially arranged.
3. A cyclone burner with multi-pass for primary air according to claim 1, characterized in that: the multistage primary air channel (1) comprises a primary air channel (1-1), a secondary primary air channel (1-2), a tertiary primary air channel (1-3), a quaternary primary air channel (1-4), a quinary primary air channel (1-5), a quinary primary air channel (1-6), a heptaary primary air channel (1-7), an octave primary air channel (1-8), a nonage primary air channel (1-9) and a decage primary air channel (1-10);
the outer surface of the primary air channel (1-1) is sequentially sleeved with a secondary primary air channel (1-2), a tertiary primary air channel (1-3), a quaternary primary air channel (1-4), a quinary primary air channel (1-5), a quinary primary air channel (1-6), a seven-level primary air channel (1-7), an eight-level primary air channel (1-8), a nine-level primary air channel (1-9) and a ten-level primary air channel (1-10), and the primary air channels are coaxially arranged.
4. A cyclone burner with multi-pass for primary air according to claim 1, characterized in that: and inner secondary air swirl blades (2-1) are arranged in the inner secondary air channel (2).
5. A cyclone burner with multi-pass for primary air according to claim 1, characterized in that: and outer secondary air swirl blades (3-1) are arranged in the outer secondary air channel (3).
6. A cyclone burner with multi-pass for primary air according to claim 3, characterized in that: the powder feeding pipeline (4) comprises a first-level powder feeding pipeline (4-1), a second-level powder feeding pipeline (4-2), a third-level powder feeding pipeline (4-3), a fourth-level powder feeding pipeline (4-4), a fifth-level powder feeding pipeline (4-5), a sixth-level powder feeding pipeline (4-6), a seventh-level powder feeding pipeline (4-7), an eight-level powder feeding pipeline (4-8), a nine-level powder feeding pipeline (4-9) and a ten-level powder feeding pipeline (4-10);
the outer surface of the first-stage powder feeding pipeline (4-1) is sequentially sleeved with a second-stage powder feeding pipeline (4-2), a third-stage powder feeding pipeline (4-3), a fourth-stage powder feeding pipeline (4-4), a fifth-stage powder feeding pipeline (4-5), a sixth-stage powder feeding pipeline (4-6), a seventh-stage powder feeding pipeline (4-7), an eighth-stage powder feeding pipeline (4-8), a ninth-stage powder feeding pipeline (4-9) and a tenth-stage powder feeding pipeline (4-10) which are coaxially arranged.
7. A cyclone burner with multi-pass for primary air according to claim 6, characterized in that: the inner walls of the output ends of the first-stage powder feeding pipeline (4-1), the second-stage powder feeding pipeline (4-2), the third-stage powder feeding pipeline (4-3), the fourth-stage powder feeding pipeline (4-4), the fifth-stage powder feeding pipeline (4-5), the sixth-stage powder feeding pipeline (4-6), the seventh-stage powder feeding pipeline (4-7), the eighth-stage powder feeding pipeline (4-8), the ninth-stage powder feeding pipeline (4-9) and the tenth-stage powder feeding pipeline (4-10) are respectively provided with a baffle plate 4-11.
8. A cyclone burner with multi-channel primary air as claimed in claim 6, wherein: the output end of the first-stage powder feeding pipeline (4-1) is connected with the input end of the first-stage primary air channel (1-1), the output end of the second-stage powder feeding pipeline (4-2) is connected with the input end of the second-stage primary air channel (1-2), the output end of the third-stage powder feeding pipeline (4-3) is connected with the input end of the third-stage primary air channel (1-3), the output end of the fourth-stage powder feeding pipeline (4-4) is connected with the input end of the fourth-stage primary air channel (1-4), the output end of the fifth-stage powder feeding pipeline (4-5) is connected with the input end of the fifth-stage primary air channel (1-5), the output end of the sixth-stage powder feeding pipeline (4-6) is connected with the input end of the sixth-stage primary air channel (1-6), and the output end of the seventh-stage powder feeding pipeline (4-7) is connected with the input end of the seventh-stage primary air channel (1-7), the output end of the eight-level powder feeding pipeline (4-8) is connected with the input end of the eight-level primary air channel (1-8), the output end of the nine-level powder feeding pipeline (4-9) is connected with the input end of the nine-level primary air channel (1-9), and the output end of the ten-level powder feeding pipeline (4-10) is connected with the input end of the ten-level primary air channel (1-10).
9. A cyclone burner with multi-pass for primary air according to claim 3, characterized in that: the cross-sectional areas of the outer walls of the primary air ventilating ducts of each two stages in the multi-stage primary air channel (1) are the same.
10. A cyclone burner with multi-pass for primary air according to claim 6, characterized in that: the cross-sectional areas of the outer walls of every two stages of powder feeding pipelines in the powder feeding pipeline (4) are the same.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210545932.9A CN114791106A (en) | 2022-05-19 | 2022-05-19 | Cyclone burner with multi-channel primary air |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210545932.9A CN114791106A (en) | 2022-05-19 | 2022-05-19 | Cyclone burner with multi-channel primary air |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62233611A (en) * | 1986-04-04 | 1987-10-14 | Ishikawajima Harima Heavy Ind Co Ltd | Pulverized coal burner device |
| CN2172404Y (en) * | 1993-11-09 | 1994-07-20 | 哈尔滨工业大学 | Radial thick/thin spiral flow powdered coal burner |
| CN102506425A (en) * | 2011-09-28 | 2012-06-20 | 哈尔滨工业大学 | Central-feeding swirling pulverized coal burner with central air pipeline |
| CN104566357A (en) * | 2013-10-29 | 2015-04-29 | 烟台龙源电力技术股份有限公司 | Pulverized coal burner and boiler |
| CN206018611U (en) * | 2016-08-29 | 2017-03-15 | 金大地新能源（天津）集团股份有限公司 | Coal burner |
| CN206739288U (en) * | 2017-04-21 | 2017-12-12 | 西安西热节能技术有限公司 | A kind of heat smoke powder feeding formula low-load combustion-stabilizing burner |
-
2022
- 2022-05-19 CN CN202210545932.9A patent/CN114791106A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62233611A (en) * | 1986-04-04 | 1987-10-14 | Ishikawajima Harima Heavy Ind Co Ltd | Pulverized coal burner device |
| CN2172404Y (en) * | 1993-11-09 | 1994-07-20 | 哈尔滨工业大学 | Radial thick/thin spiral flow powdered coal burner |
| CN102506425A (en) * | 2011-09-28 | 2012-06-20 | 哈尔滨工业大学 | Central-feeding swirling pulverized coal burner with central air pipeline |
| CN104566357A (en) * | 2013-10-29 | 2015-04-29 | 烟台龙源电力技术股份有限公司 | Pulverized coal burner and boiler |
| CN206018611U (en) * | 2016-08-29 | 2017-03-15 | 金大地新能源（天津）集团股份有限公司 | Coal burner |
| CN206739288U (en) * | 2017-04-21 | 2017-12-12 | 西安西热节能技术有限公司 | A kind of heat smoke powder feeding formula low-load combustion-stabilizing burner |
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