CN210320012U - Low-nitrogen combustion discharge system of circulating fluidized bed boiler - Google Patents
Low-nitrogen combustion discharge system of circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN210320012U CN210320012U CN201921034962.3U CN201921034962U CN210320012U CN 210320012 U CN210320012 U CN 210320012U CN 201921034962 U CN201921034962 U CN 201921034962U CN 210320012 U CN210320012 U CN 210320012U
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- CN
- China
- Prior art keywords
- boiler
- fluidized bed
- circulating fluidized
- cyclone separator
- nitrogen combustion
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 22
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 20
- 239000000446 fuel Substances 0.000 claims abstract description 16
- 235000019738 Limestone Nutrition 0.000 claims abstract description 15
- 239000006028 limestone Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 15
- 239000000428 dust Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- 239000012717 electrostatic precipitator Substances 0.000 claims description 5
- 238000005243 fluidization Methods 0.000 claims description 4
- 238000013329 compounding Methods 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- 239000003245 coal Substances 0.000 abstract description 12
- 239000007789 gas Substances 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 235000012054 meals Nutrition 0.000 abstract 1
- 238000006477 desulfuration reaction Methods 0.000 description 17
- 230000023556 desulfurization Effects 0.000 description 17
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
The utility model discloses a circulating fluidized bed boiler low-nitrogen combustion discharge system, which comprises a boiler, a primary air fan and a secondary air fan, wherein one side of the bottom of the boiler is connected with a limestone hopper and a fuel warehouse through pipelines, the discharge ends of the limestone hopper and the fuel warehouse are connected with a mixing box body through a feeder and a pipeline, one side of the upper end of the boiler is connected with a cyclone separator through a conveying channel, a denitration spray gun is arranged on the conveying channel between the boiler and the cyclone separator, the air outlet end of the upper side of the cyclone separator is connected with a tail flue, an air preheater is arranged at the lower part of the tail flue, one side of the bottom of the tail flue is connected with a desulfurizing tower through a pipeline, the circulating fluidized bed boiler low-nitrogen combustion discharge system can fully mix limestone and coal meal through the mixing box body, and is beneficial to improving the desulfurizing efficiency during, the tail gas can be sprayed and alkali-washed through the desulfurizing tower, and the desulfurizing efficiency is improved by double desulfurizing.
Description
Technical Field
The utility model relates to a circulating fluidized bed boiler tail gas treatment technical field specifically is a circulating fluidized bed boiler low-nitrogen combustion discharge system.
Background
The circulating fluidized bed boiler is a clean coal combustion device with the highest industrialization degree, and the desulfurization process consists of an absorbent adding system, an absorption tower, a recirculation system and an automatic control system. Flue gas enters the absorption tower from an air distribution plate at the lower part of the fluidized bed and is fully mixed with slaked lime particles, SO2, SO3 and other harmful gases such as HCl and HF react with the slaked lime to generate CaSO3 & 1/2H2O, CaSO4 & 1/2H2O and CaCO 3. The reaction product is carried out from the upper part of the absorption tower by the flue gas, the reaction product is separated by a dust remover, the separated solid ash and slag are sent back to the circulating bed absorption tower by an air chute, and the ash and slag circulating amount can be adjusted according to the load. The recycling of the absorbent prolongs the desulfurization reaction time and improves the utilization rate of the desulfurizer. The process water is sprayed into the lower part of the absorption tower by a nozzle to increase the humidity of the flue gas and reduce the temperature of the flue gas, so that the reaction temperature is as close as possible to the dew point temperature of the water, thereby improving the desulfurization efficiency.
The prior art has the following problems: the existing circulating fluidized bed boiler has poor treatment effect on the combustion exhaust tail gas, can not fully mix limestone and coal materials, thus easily causing low desulfurization rate, and adopts a single mode for desulfurization treatment, so that the desulfurization is not thorough and the atmospheric pollution is easily caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a circulating fluidized bed boiler low nitrogen combustion discharge system to solve the problem among the prior art.
In order to achieve the above object, the utility model provides a following technical scheme: a circulating fluidized bed boiler low-nitrogen combustion discharge system comprises a boiler, a primary air fan and a secondary air fan, wherein one side of the bottom of the boiler is connected with a limestone hopper and a fuel reservoir through pipelines, the discharge ends of the limestone hopper and the fuel reservoir are connected with a mixing box body through a feeder and a pipeline, one side of the upper end of the boiler is connected with a cyclone separator through a conveying channel, a denitration spray gun is installed on the conveying channel between the boiler and the cyclone separator, the air outlet end of the upper side of the cyclone separator is connected with a tail flue, an air preheater is installed at the lower part of the tail flue, one side of the bottom of the tail flue is connected with a desulfurizing tower through a pipeline, the output end of the desulfurizing tower is connected with an electric dust remover through a pipeline, one side of the electric dust remover is connected with a chimney through a pipeline, the tail flue is provided with a high-temperature superheater, a low-temperature superheater and an economizer from top to bottom.
Preferably, a material preheater is installed on the lower portion of the mixing box body, and the material preheater is preheated in an electric heating mode.
Preferably, the denitration spray gun is evenly distributed with a plurality of from top to bottom in the pipeline that boiler and cyclone are connected, and the denitration spray gun passes through water pump and water piping connection has the ammonia pond.
Preferably, the bottom of the cyclone separator is provided with a high-pressure fluidization fan and a material return valve, and one end of the material return valve is communicated with the bottom of the boiler through a pipeline.
Preferably, the spray tray is installed on desulfurizing tower upper portion, the spray tray upper end passes through the pipe connection lime pond, the desulfurizing tower bottom is provided with the outlet.
Preferably, the lower side of the electric dust collector is provided with two dust discharge ports.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) through the compounding box that is equipped with, can be so that lime stone and coal charge powder intensive mixing, be favorable to improving desulfurization efficiency during the burning, can spray the alkali wash to tail gas through the desulfurizing tower that is equipped with, the double desulfurization has improved desulfurization efficiency, and the desulfurization is more thorough.
(2) The primary fan and the secondary fan are arranged, so that the local air-coal ratio uniformity of the burn-out rate can be guaranteed, and the good fuel adaptability of the whole low-oxygen combustion process can be improved; and the feed back valve that is equipped with is convenient for with the coal charge backward flow of collecting in the cyclone to the boiler in burn, has improved the utilization ratio of fuel.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. a boiler; 2. a limestone hopper; 3. a fuel reservoir; 4. a cyclone separator; 5. a high pressure fluidization air blower; 6. a material return valve; 7. a tail flue; 8. a high temperature superheater; 9. a low temperature superheater; 10. a coal economizer; 11. an air preheater; 12. a primary air fan; 13. a secondary air fan; 14. a desulfurizing tower; 15. spraying a disc; 17. an electric dust collector; 18. a dust exhaust port; 19. a chimney; 20. a water outlet; 21. a water outlet; 22. a material preheater; 23. denitration spray gun.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a circulating fluidized bed boiler low-nitrogen combustion emission system includes a boiler 1, a primary air fan 12 and a secondary air fan 13, one side of the bottom of the boiler 1 is connected to a limestone hopper 2 and a fuel reservoir 3 through pipes, discharge ends of the limestone hopper 2 and the fuel reservoir 3 are connected to a mixing box 21 through a feeder and a pipe, so that limestone and coal powder can be sufficiently mixed, which is beneficial to improving desulfurization efficiency during combustion, one side of the upper end of the boiler 1 is connected to a cyclone separator 4 through a conveying channel for separating gas and particles, a denitration spray gun 23 is installed on the conveying channel between the boiler 1 and the cyclone separator 4, and can spray ammonia water to reduce nitrogen oxides into inert molecular nitrogen substances, an air outlet end of the upper side of the cyclone separator 4 is connected to a tail flue 7, and an air preheater 11 is installed under the tail flue 7, 7 bottom one side of afterbody flue has desulfurizing tower 14 through the pipe connection, can carry out alkali wash sulphur removal to the tail gas that discharges and handle, 14 output ends of desulfurizing tower have electrostatic precipitator 17 through the pipe connection, there is chimney 19 through the pipe connection in electrostatic precipitator 17 one side, primary air fan 12 and overfire air fan 13 run through air heater 11 and boiler 1 bottom and middle part intercommunication through the defeated tuber pipe, make the oxygen intensive mixing in fuel and the air, the local wind coal ratio that can ensure the burn-off rate is even, be favorable to improving combustion efficiency, afterbody flue 7 is by last high temperature over heater 8 of installing down, low temperature over heater 9, economizer 10.
Preferably, the material preheater 22 is installed to compounding box 21 lower part, and the inside electric heating mode that adopts of material preheater 22 preheats for preheat the burning material and be convenient for dry the improvement combustion efficiency to the material.
Preferably, denitration spray gun 23 has a plurality ofly about evenly distributed in the pipeline that boiler 1 and cyclone 4 are connected, and denitration spray gun 23 has the ammonia water pond through water pump and water piping connection, and denitration spray gun 23 spun atomizing aqueous ammonia air current covers most flue gas very easily, and the misce bene is convenient for carry out abundant denitration processing.
Preferably, high-pressure fluidization fan 5 and feed back valve 6 are installed to cyclone 4 bottom, and feed back valve 6 one end passes through pipeline and boiler 1 bottom intercommunication, are convenient for flow back the coal charge of collecting in cyclone 4 to boiler 1 bottom and burn, have improved the utilization of fuel.
Preferably, spray tray 15 is installed on desulfurizing tower 14 upper portion, and spray tray 15 upper end is provided with outlet 20 through pipe connection lime water basin, 14 bottoms of desulfurizing tower, can spray the alkali wash to tail gas, and double desulfurization has improved desulfurization efficiency, and the desulfurization is more thorough.
Preferably, the lower side of the electric dust collector 17 is provided with two dust discharge ports 18, so that the dust inside the electric dust collector 17 can be discharged conveniently.
The working principle is as follows: limestone powder and coal powder in the limestone hopper 2 and the fuel reservoir 3 are fed into the bottom of the boiler 1 by the feeder to be combusted, air is blown into one side of the bottom of the boiler 1 by the primary fan 12 and the secondary fan 13, so that fuel and oxygen in the air are fully mixed, the local air-coal ratio of the burnout rate can be ensured to be uniform, the good fuel adaptability of the whole low-oxygen combustion process is favorably improved, combustion tail gas can be sprayed with ammonia water by the denitration spray gun 23 in the conveying pipeline, nitrogen oxides are reduced into inert molecular nitrogen substances, such as gaseous nitrogen, nitrogen solution dropping liquid or nitrogen stock solution and the like, then the tail gas enters the desulfurizing tower 14 after passing through the tail flue, alkaline washing can be carried out on the tail gas in a spraying manner, double desulfurization improves the desulfurization efficiency, the desulfurization is more thorough, and the tail gas is discharged by a chimney 19 after passing through the electric dust.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A circulating fluidized bed boiler low-nitrogen combustion discharge system comprises a boiler (1), a primary fan (12) and a secondary fan (13), and is characterized in that one side of the bottom of the boiler (1) is connected with a limestone hopper (2) and a fuel storage (3) through pipelines, the discharge ends of the limestone hopper (2) and the fuel storage (3) are connected with a mixing box body (21) through pipelines, one side of the upper end of the boiler (1) is connected with a cyclone separator (4) through a conveying channel, a denitration spray gun (23) is installed on the conveying channel between the boiler (1) and the cyclone separator (4), the air outlet end on the upper side of the cyclone separator (4) is connected with a tail flue (7), an air preheater (11) is installed on the lower portion of the tail flue (7), one side of the bottom of the tail flue (7) is connected with a desulfurizing tower (14, desulfurizing tower (14) output has electrostatic precipitator (17) through the pipe connection, there is chimney (19) in electrostatic precipitator (17) one side through the pipe connection, air heater (11) and boiler (1) bottom and middle part intercommunication are run through the ducted duct in primary air fan (12) and secondary air fan (13), afterbody flue (7) are by last high temperature over heater (8), low temperature over heater (9), economizer (10) of installing down.
2. The circulating fluidized bed boiler low nitrogen combustion exhaust system of claim 1, wherein: the material preheater (22) is installed to compounding box (21) lower part, and inside the adoption electric heating mode of material preheater (22) preheats.
3. The circulating fluidized bed boiler low nitrogen combustion exhaust system of claim 1, wherein: the denitration spray gun (23) is uniformly distributed in a plurality of positions from top to bottom in a pipeline connected with the boiler (1) and the cyclone separator (4), and the denitration spray gun (23) is connected with an ammonia water tank through a water pump and a water pipe.
4. The circulating fluidized bed boiler low nitrogen combustion exhaust system of claim 1, wherein: the bottom of the cyclone separator (4) is provided with a high-pressure fluidization fan (5) and a material return valve (6), and one end of the material return valve (6) is communicated with the bottom of the boiler (1) through a pipeline.
5. The circulating fluidized bed boiler low nitrogen combustion exhaust system of claim 1, wherein: spray tray (15) are installed on desulfurizing tower (14) upper portion, pass through pipe connection lime pond spray tray (15) upper end, desulfurizing tower (14) bottom is provided with outlet (20).
6. The circulating fluidized bed boiler low nitrogen combustion exhaust system of claim 1, wherein: dust exhaust mouth (18) are provided with to electrostatic precipitator (17) downside, and dust exhaust mouth (18) are provided with two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921034962.3U CN210320012U (en) | 2019-07-04 | 2019-07-04 | Low-nitrogen combustion discharge system of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921034962.3U CN210320012U (en) | 2019-07-04 | 2019-07-04 | Low-nitrogen combustion discharge system of circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210320012U true CN210320012U (en) | 2020-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921034962.3U Expired - Fee Related CN210320012U (en) | 2019-07-04 | 2019-07-04 | Low-nitrogen combustion discharge system of circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210320012U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118623306A (en) * | 2024-08-09 | 2024-09-10 | 中国电建集团山东电力建设第一工程有限公司 | High-efficiency circulating fluidized bed boiler for burning low-calorific-value fuel |
-
2019
- 2019-07-04 CN CN201921034962.3U patent/CN210320012U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118623306A (en) * | 2024-08-09 | 2024-09-10 | 中国电建集团山东电力建设第一工程有限公司 | High-efficiency circulating fluidized bed boiler for burning low-calorific-value fuel |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20200414 |