CN220828848U - Flue gas recirculation deep classification system of coal-fired grate-fired boiler - Google Patents
Flue gas recirculation deep classification system of coal-fired grate-fired boiler Download PDFInfo
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- CN220828848U CN220828848U CN202321119402.4U CN202321119402U CN220828848U CN 220828848 U CN220828848 U CN 220828848U CN 202321119402 U CN202321119402 U CN 202321119402U CN 220828848 U CN220828848 U CN 220828848U
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- air
- recirculation
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- recycling
- induced draft
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000003546 flue gas Substances 0.000 title claims abstract description 43
- 230000001105 regulatory effect Effects 0.000 claims abstract description 16
- 239000000428 dust Substances 0.000 claims abstract description 15
- 239000003245 coal Substances 0.000 claims abstract description 6
- 238000004064 recycling Methods 0.000 claims description 48
- 238000001816 cooling Methods 0.000 claims description 10
- 238000010304 firing Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 22
- 238000000197 pyrolysis Methods 0.000 abstract description 6
- 230000003134 recirculating effect Effects 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 21
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Regulation And Control Of Combustion (AREA)
Abstract
The utility model provides a flue gas recirculation depth classification system of a coal-fired grate-fired boiler. The flue gas recirculation depth classification system based on the coal-fired grate-fired boiler comprises a boiler, a grate, a dust remover, a boiler induced draft fan, a recirculation induced draft fan pipeline, a recirculation branch pipeline, a recirculation induced draft fan output pipeline, a recirculation primary air branch pipeline, a recirculation secondary air mother pipeline, a recirculation secondary air branch pipeline, a branch pipeline electric regulating valve, an air chamber pressure measuring meter and a recirculation secondary air nozzle. And regulating and controlling the corresponding air distribution and recirculation smoke quantity according to the temperature of the main combustion area of the fire grate, the layer thickness of the coal and the rotation speed of the fire grate, delaying the backward movement of the ignition section of the air distribution, increasing the length of the volatile pyrolysis area to separate out the reducing volatile matters in the volatile pyrolysis area, and recirculating the secondary air to reduce the temperature of the main combustion area to make the temperature of the whole combustion area uniform.
Description
Technical Field
The utility model relates to the technical field of boiler flue gas grading systems, in particular to a coal-fired grate-fired boiler flue gas recirculation deep grading system.
Background
In the research of pollutant emission reduction of industrial boilers, research on SO2 and smoke dust is carried out earlier, and a lot of research results are obtained and are industrially applied. Due to the characteristics of low-temperature combustion of the industrial boiler, the generated NOx amount is relatively small (400-700 mg/Nm 3). Therefore, the NOx emission reduction work of the industrial boiler is not paid attention to fully. Therefore, development of low NOx combustion technology for an economical layer combustion boiler in cooperation with a combustion process is very urgent.
The technology history of the combustion of coal is long, but NOx economy control for the combustion process is a new problem. The theory of controlling the emission of nitrogen oxides by the existing flue gas recirculation only considers that the mixing of the circulated flue gas reduces the oxygen concentration of the gas flow passing through the coal bed from the mechanism level, and inhibits the reaction of fuel nitrogen and oxygen. According to the theory, the prior combustion technology patents related to the recycling of the flue gas and reducing NO are all based on the theory, the recycling flue gas is singly or mixed with primary air to be sent into an air chamber of a grate-fired boiler, the actual nitrogen reduction efficiency is not more than 20%, and meanwhile, the problems of coal seam cementation, flame running and boiler efficiency reduction are caused.
Disclosure of utility model
(One) solving the technical problems
Aiming at the defects of the prior art, the utility model provides a flue gas recirculation deep classification system of a coal-fired grate-fired boiler, which solves the problem that NO generated in the combustion process cannot be effectively reduced.
(II) technical scheme
In order to achieve the above purpose, the utility model is realized by the following technical scheme: a coal-fired grate firing boiler flue gas recirculation depth classification system comprising:
The system comprises a boiler, a fire grate, a dust remover, a boiler induced draft fan, a recycling induced draft fan pipeline, a recycling branch pipeline, a recycling induced draft fan output pipeline, a recycling primary air branch pipeline, a recycling secondary air parent pipeline, a recycling secondary air branch pipeline, a branch pipeline electric regulating valve, an air chamber pressure measuring meter and a recycling secondary air nozzle;
one end of the recycling induced draft fan pipeline is communicated with an outlet of a boiler induced draft fan, the other end of the recycling induced draft fan pipeline is communicated with an air inlet of the recycling induced draft fan, an output end of the recycling induced draft fan is communicated with one end of an output pipeline of the recycling induced draft fan, recycling air chambers are arranged in the fire grate, the number of the recycling air chambers is seven and distributed left and right, the other end of the output pipeline of the recycling induced draft fan is respectively communicated with second to seventh recycling air chambers through recycling secondary air branch pipelines, branch pipeline electric regulating valves are arranged in the recycling branch pipelines, air chamber electric regulating valves are arranged in the second to seventh recycling air chambers, and air chamber pressure measuring meters are arranged in the second to seventh recycling air chambers;
The utility model discloses a circulating air fan, including recirculation overgrate air main pipe, recirculation overgrate air main pipe one end and recirculation draught fan output pipeline intercommunication, recirculation overgrate air main pipe other end and recirculation overgrate air branch pipe intercommunication, recirculation overgrate air branch pipe other end fixedly connected with front arch, back arch respectively, the side surface of front arch, back arch is provided with recirculation overgrate air nozzle respectively.
Preferably, the input end of the dust remover is fixedly connected with a flue, one end of the flue, which is far away from the dust remover, is fixedly connected with the boiler, and the outlet of the dust remover is communicated with the inlet of the boiler induced draft fan.
Preferably, the recirculation secondary air mother pipeline is responsible for including the intercommunication, branch pipe, first U type pipeline, second U type pipeline, first blast pipe, second blast pipe, recirculation draught fan output pipeline is responsible for the intercommunication with the intercommunication, the branch pipe is located and is responsible for one side, the intercommunication is responsible for, the branch pipe is responsible for, the branch pipe between communicate through second U type pipeline intercommunication, the surface fixed connection of first blast pipe and first U type pipeline, the surface fixed connection of second blast pipe and second U type pipeline.
Preferably, the recirculation secondary air nozzle is positioned on the rear arch heating surface, the outer surface of the recirculation secondary air nozzle is provided with an air cooling protective sleeve, the air cooling protective sleeve is made of stainless steel, air is supplied to the air cooling protective sleeve through a centrifugal fan, the spray gun is prevented from contacting with smoke as much as possible, and the service life of the spray gun is prolonged.
Preferably, the recirculation air chamber is formed by a partition plate, and the recirculation air chamber is internally provided with a flue gas recirculation air pipe and is longitudinally arranged.
Preferably, flue gas recirculation air inlets are respectively formed in the two opposite side wallboards of the recirculation air chamber, and air outlets are formed in the side surfaces of the partition boards.
(III) beneficial effects
The utility model provides a flue gas recirculation depth classification system of a coal-fired grate-fired boiler. The beneficial effects are as follows:
1. According to the flue gas recirculation depth grading system based on the coal-fired grate firing boiler, corresponding air distribution and recirculation flue gas quantity are regulated and controlled according to the temperature of a main combustion area of a fire grate, the layer thickness of coal and the rotation speed of the fire grate, the backward movement of an air distribution firing area is delayed, the length of a volatile pyrolysis area is increased to enable the volatile pyrolysis area to separate out reducing volatile matters, and the temperature of the main combustion area is reduced by recirculating secondary air to enable the temperature of the whole combustion area to be uniform, so that the generation of thermal nitrogen oxides and the conversion rate of fuel nitrogen oxides are reduced.
2. The flue gas recirculation depth grading system based on the coal-fired layer combustion boiler mainly comprises recirculated flue gas, the burnout of residual coke in the burnout zone and the cooling of ash slag are realized by means of oxygen in the recirculated flue gas, the high-oxygen flue gas in the burnout zone is led to the hearth through a flue gas communication pipeline from the rear arch to the rear wall of the boiler by means of pressure difference between recirculated secondary air in the rear arch burnout zone of the layer combustion boiler and the vertical section of the hearth, the effect of the burnout air is achieved to a certain extent, the flue gas is mixed with throat flue gas, the combustion of combustible gas and unburnt carbon particles in the flue gas is promoted, and the impulse of the front arch of the rear arch flue gas is reduced.
Drawings
FIG. 1 is a view of a depth classification system for flue gas recirculation of a coal-fired grate-fired boiler;
FIG. 2 is a top view of a uniform air distribution chamber structure;
FIG. 3 is a front view of a structure of the uniform air distribution chamber;
Fig. 4 is a schematic diagram of the distribution of the secondary air distribution pipes of the flue gas recirculation.
1, A boiler; 2. an air chamber pressure gauge; 3. a fire grate; 4. an electric air chamber regulating valve; 5. recycling the secondary air branch pipeline; 6. a front arch; 7. recirculating the overgrate air nozzle; 8. a rear arch; 9. a recirculation branch line; 10. a branch pipeline electric regulating valve; 11. recycling the secondary air mother pipeline; 11a, a communicating main pipe; 11b, branch pipes; 11c, a first U-shaped pipeline; 11d, a second U-shaped pipeline; 11e, a first air supply pipe; 11f, a second air supply pipe; 12. an output pipeline of the recirculation induced draft fan; 13. a recirculating induced draft fan; 14. a recirculating induced draft fan line; 15. a boiler induced draft fan; 16. a dust remover; 17. recycling the primary air branch pipeline; 18. a partition plate; 19. an air outlet; 20. recycling the air chamber; 21. two side wallboards; 22. and recycling the air inlet.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1-4, the embodiment of the utility model provides a flue gas recirculation depth classification system of a coal-fired layer combustion boiler, which comprises a boiler 1, a fire grate 3, a dust remover 16, a boiler induced draft fan 15, a recirculation induced draft fan pipeline 14, a recirculation branch pipeline 9, a recirculation induced draft fan 13, a recirculation induced draft fan output pipeline 12, a recirculation primary air branch pipeline 17, a recirculation secondary air mother pipeline 11, a recirculation secondary air branch pipeline 5, a branch pipeline electric regulating valve 10, a wind chamber pressure measuring meter 2 and a recirculation secondary air nozzle 7, wherein the input end of the dust remover 16 is fixedly connected with a flue, the branch pipeline electric regulating valve 10 is used for regulating gas in a pipeline, one end of the flue far away from the dust remover 16 is fixedly connected with the boiler 1, the outlet of the dust remover 16 is communicated with the inlet of the boiler induced draft fan 15, the recirculation secondary air mother pipeline 11 comprises a main pipe 11a, a branch pipe 11b, a first U-shaped pipeline 11c, a second U-shaped pipeline 11d, a first air supply pipe 11e and a second air supply pipe 11f, the recirculation output pipeline 12 is communicated with the main pipe 11a, the branch pipe 11b is positioned on one side of the main pipe 11a, the branch pipe 11a is fixedly connected with the first U-shaped pipeline 11c and the outer surface of the main pipe 11c is fixedly connected with the second main pipe 11c through the first U-shaped pipeline 11b, and the first U-shaped branch pipeline 11c is fixedly connected with the outer surface of the main pipe 11 c.
One end of a recirculation induced draft fan pipeline 14 is communicated with an outlet of a boiler induced draft fan 15, the other end of the recirculation induced draft fan pipeline 14 is communicated with an air inlet of a recirculation induced draft fan 13, an output end of the recirculation induced draft fan 13 is communicated with one end of a recirculation induced draft fan output pipeline 12, a recirculation air chamber 20 is arranged in the grate 3, the recirculation air chamber 20 is formed by a partition plate 18, flue gas recirculation air pipes are arranged in the recirculation air chamber 20 in a longitudinal arrangement mode, flue gas recirculation air inlets 22 are respectively arranged on two opposite side wallboards 21 of the recirculation air chamber 20 for outward inflow of gas, air outlets 19 are arranged on side surfaces of the partition plate 18, the number of the recirculation air chambers 20 is seven and distributed left and right, the other end of the recirculation induced draft fan output pipeline 12 is respectively communicated with second to seventh recirculation air chambers 20 through recirculation secondary air branch pipelines 5, air chamber electric regulating valves 10 are arranged in the recirculation branch pipelines 9, air chamber electric regulating valves 4 are arranged in the second to seventh recirculation air chambers 20, and air chamber pressure measuring meters 2 are arranged in the second to seventh recirculation air chambers 20 for pressure measurement.
One end of a recirculation secondary air bus pipeline 11 is communicated with a recirculation induced draft fan output pipeline 12, the other end of the recirculation secondary air bus pipeline 11 is communicated with a recirculation secondary air branch pipeline 5, one end of a recirculation secondary air nozzle 7 is communicated with the recirculation secondary air branch pipeline 5, the other end of the recirculation secondary air nozzle 7 is respectively and fixedly connected with a front arch 6 and a rear arch 8 for increasing pressure difference, the side surfaces of the front arch 6 and the rear arch 8 are respectively provided with a recirculation secondary air nozzle 7, the recirculation secondary air nozzle 7 is positioned on a heated surface of the rear arch 8, the outer surface of the recirculation secondary air nozzle 7 is provided with an air cooling protective sleeve, the air cooling protective sleeve is made of stainless steel, air is supplied to the air cooling protective sleeve through a centrifugal fan, the spray gun is ensured not to contact with smoke as much as possible, and the service life of the spray gun is prolonged.
Working principle: through implementation of the technical scheme, the ignition section can be moved backwards, the length of the volatile pyrolysis area is increased to enable the reducing volatile matters separated out from the volatile pyrolysis area to be increased, the reducing volatile matters and generated nitrogen oxides are subjected to oxidation-reduction reaction, the emission of final nitrogen oxides is reduced, the temperature of the main combustion area is reduced by the recycled secondary air, the temperature of the whole combustion area is uniform, the generation of thermal nitrogen oxides and the conversion rate of fuel nitrogen oxides are reduced, the air distribution of the burnout section of the upper bed layer of the grate 3 takes the recycled flue gas as a main part, the burnout of residual coke of the burnout section and the cooling of ash slag are realized by means of the oxygen content in the recycled flue gas, the pressure difference between the recycled secondary air of the burnout section of the main combustion area and the vertical section of a hearth can be utilized, the flue gas communication pipeline from the rear arch 8 to the rear wall of the boiler 1 leads the high oxygen content flue gas of the burnout area to the hearth, the effect of the burnout air is played to a certain extent, the burnout air is mixed with the throat, the combustion of combustible gas and the unburnt carbon particles in the burnout is promoted, and the forward smoke of the rear arch 8 is reduced.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a fire coal layer fires boiler flue gas recirculation degree of depth grading system which characterized in that includes:
The device comprises a boiler (1), a fire grate (3), a dust remover (16), a boiler induced draft fan (15), a recycling induced draft fan pipeline (14), a recycling branch pipeline (9), a recycling induced draft fan (13), a recycling induced draft fan output pipeline (12), a recycling primary air branch pipeline (17), a recycling secondary air parent pipeline (11), a recycling secondary air branch pipeline (5), a branch pipeline electric regulating valve (10), an air chamber pressure measuring meter (2) and a recycling secondary air nozzle (7);
One end of the recycling induced draft fan pipeline (14) is communicated with an outlet of a boiler induced draft fan (15), the other end of the recycling induced draft fan pipeline (14) is communicated with an air inlet of the recycling induced draft fan (13), the output end of the recycling induced draft fan (13) is communicated with one end of a recycling induced draft fan output pipeline (12), recycling air chambers (20) are arranged in the fire grate (3), the number of the recycling air chambers (20) is seven and distributed left and right, the other end of the recycling induced draft fan output pipeline (12) is respectively communicated with second to seventh recycling air chambers (20) through a recycling secondary air branch pipeline (5), branch pipeline electric regulating valves (10) are arranged in the recycling branch pipeline (9), air chamber electric regulating valves (4) are arranged in the second to seventh recycling air chambers (20), and air chamber pressure measuring meters (2) are arranged in the second to seventh recycling air chambers (20);
The utility model discloses a circulating air fan, including recirculation overgrate air female pipeline (11), recirculation overgrate air female pipeline (11) other end and recirculation overgrate air branch pipeline (5) intercommunication, recirculation overgrate air branch pipeline (5) with recirculation overgrate air nozzle (7) intercommunication, recirculation overgrate air branch pipeline (5) other end fixedly connected with front arch (6), back arch (8) respectively, the side surface of front arch (6), back arch (8) is provided with recirculation overgrate air nozzle (7) respectively.
2. The coal-fired grate firing boiler flue gas recirculation depth classification system of claim 1, wherein: the input of dust remover (16) fixedly connected with flue, the one end that dust remover (16) was kept away from to the flue is fixedly connected with boiler (1), the export of dust remover (16) communicates with the entry of boiler draught fan (15).
3. The coal-fired grate firing boiler flue gas recirculation depth classification system of claim 1, wherein: the secondary air circulating bus pipeline (11) comprises a main communicating pipe (11 a), a branch pipe (11 b), a first U-shaped pipeline (11 c), a second U-shaped pipeline (11 d), a first air supply pipe (11 e) and a second air supply pipe (11 f), an output pipeline (12) of a circulating induced draft fan is communicated with the main communicating pipe (11 a), the branch pipe (11 b) is located at one side of the main pipe (11 a), the main communicating pipe (11 a) and the branch pipe (11 b) are communicated through the first U-shaped pipeline (11 c), the main communicating pipe (11 a) and the branch pipe (11 b) are communicated through the second U-shaped pipeline (11 d), the first air supply pipe (11 e) is fixedly connected with the outer surface of the first U-shaped pipeline (11 c), and the second air supply pipe (11 f) is fixedly connected with the outer surface of the second U-shaped pipeline (11 d).
4. The coal-fired grate firing boiler flue gas recirculation depth classification system of claim 1, wherein: the recirculation secondary air nozzle (7) is positioned on the heating surface of the rear arch (8), an air cooling protective sleeve is arranged on the outer surface of the recirculation secondary air nozzle (7), and stainless steel is selected as the air cooling protective sleeve.
5. The coal-fired grate firing boiler flue gas recirculation depth classification system of claim 1, wherein: the recirculation air chamber (20) is formed by a partition plate (18), and the flue gas recirculation air pipe is arranged in the recirculation air chamber (20) longitudinally.
6. The coal-fired grate firing boiler flue gas recirculation depth classification system according to claim 5, wherein: flue gas recirculation air inlets (22) are respectively formed in two opposite side wallboards (21) of the recirculation air chamber (20), and air outlets (19) are formed in the side surfaces of the partition plates (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321119402.4U CN220828848U (en) | 2023-05-11 | 2023-05-11 | Flue gas recirculation deep classification system of coal-fired grate-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321119402.4U CN220828848U (en) | 2023-05-11 | 2023-05-11 | Flue gas recirculation deep classification system of coal-fired grate-fired boiler |
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| Publication Number | Publication Date |
|---|---|
| CN220828848U true CN220828848U (en) | 2024-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321119402.4U Active CN220828848U (en) | 2023-05-11 | 2023-05-11 | Flue gas recirculation deep classification system of coal-fired grate-fired boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220828848U (en) |
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2023
- 2023-05-11 CN CN202321119402.4U patent/CN220828848U/en active Active
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