CN112984501A - Low-nitrogen combustion process for gas-fired boiler - Google Patents
Low-nitrogen combustion process for gas-fired boiler Download PDFInfo
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- CN112984501A CN112984501A CN202110201702.6A CN202110201702A CN112984501A CN 112984501 A CN112984501 A CN 112984501A CN 202110201702 A CN202110201702 A CN 202110201702A CN 112984501 A CN112984501 A CN 112984501A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 124
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 69
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003546 flue gas Substances 0.000 claims abstract description 45
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000001301 oxygen Substances 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- 239000003054 catalyst Substances 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000004907 flux Effects 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims description 19
- 238000002955 isolation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 239000000571 coke Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 25
- 229910021529 ammonia Inorganic materials 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 36
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
The invention relates to a low-nitrogen combustion process of a gas boiler in the technical field of gas boilers, wherein the gas boiler comprises a combustion chamber and a tail flue, and the combustion chamber adopts zoned combustion to form a bottom oxygen-poor combustion area and a middle-upper oxygen-rich combustion area; the tail flue is internally provided with an isolatable ammonia-free denitration area, the oxygen-poor combustion area is provided with a low-nitrogen combustor, the oxygen-rich combustion area is provided with a multi-layer side combustor and a graded air supply outlet to form a graded combustion state with different heat flux densities, high-temperature flue gas in the tail flue flows back into the combustion chamber through a forced flue gas recirculation pipeline to reduce the combustion heat flux density and reduce the combustion mean temperature in the combustion chamber, an ammonia-free denitration catalyst is arranged in the ammonia-free denitration area, a methane spraying grid is arranged above the ammonia-free denitration catalyst, and the methane spraying grid is connected with a methane supply system outside the tail flue. The invention can realize low-nitrogen combustion and ammonia-free denitration, is beneficial to reducing the denitration cost of the gas boiler and avoids the problem of ammonia pollution.
Description
Technical Field
The invention belongs to the technical field of gas-fired boilers, and particularly relates to a low-nitrogen combustion process of a gas-fired boiler.
Background
Present gas boiler, the original emission of nitrogen oxide is higher in the tail gas, need supporting denitrification facility can satisfy the exhaust emission standard, present gas boiler denitrification facility mostly adopts the ammonia process denitration technology of using aqueous ammonia or urea solution as the reductant, the denitration is with high costs, and produce the ammonia escape easily, can produce the ammonia pollution problem, consequently, remain to develop a new gas boiler low-nitrogen combustion technology, from the emission of burning stage control nitrogen oxide, and combine no ammonia denitration technique to carry out denitration control, thereby guarantee gas boiler's discharge to reach standard.
Disclosure of Invention
In order to solve the technical problem, the invention provides a low-nitrogen combustion process of a gas boiler, wherein the gas boiler comprises a combustion chamber and a tail flue, and the combustion chamber is internally combusted in a subarea manner to form a bottom oxygen-poor combustion area and a middle-upper oxygen-rich combustion area; the method comprises the steps of arranging an isolatable ammonia-free denitration area in a tail flue, arranging a low-nitrogen burner in an oxygen-poor combustion area, arranging a multi-layer side burner and a graded air supply outlet in an oxygen-rich combustion area to form a graded combustion state with different heat flux densities, enabling high-temperature flue gas in the tail flue to flow back into a combustion chamber through a forced flue gas recirculation pipeline to reduce the combustion heat flux density and reduce the combustion mean temperature in the combustion chamber, arranging an ammonia-free denitration catalyst in the ammonia-free denitration area, arranging a methane spraying grid above the ammonia-free denitration catalyst, and connecting the methane spraying grid with a methane supply system outside the tail flue.
Preferably, a disturbance air port is arranged in an area with high combustion heat flow density in the combustion chamber, one end of the forced flue gas recirculation pipeline is communicated with an outlet of the tail flue, a thermal circulation fan is arranged at an outlet end, close to the tail flue, of the forced flue gas recirculation pipeline, an exhaust air box of the thermal circulation fan is communicated with the disturbance air port through an air distribution pipeline, high-temperature flue gas flows back through the disturbance air port, the heat flow density in the combustion chamber can be reduced, heat energy in partial flue gas is recovered, and the dual effects of low nitrogen and energy-saving combustion are achieved.
Preferably, the low-nitrogen combustor comprises a gas pipe and a cylindrical air pipe, a gas distribution section, a stable combustion section and a disturbance section are sequentially arranged in the air pipe along the air flowing direction, the gas inlet end of the gas pipe is led in from the side wall of the gas distribution section, the tail end of the gas distribution section is provided with a gas distribution disc, the stable combustion section is provided with a high-temperature resistant stainless steel metal layer and an ignition hole, an igniter capable of being pulled out is arranged in the ignition hole, the gas outlet end of the gas pipe passes through the gas distribution disc and is coaxial with the air pipe, and the gas outlet end of the gas pipe is provided with a conical spray head, spray holes are evenly distributed on the conical spray head, the gas distribution plate is at least provided with two circles of flow equalizing holes, and the exhaust port of the air equalizing hole at the innermost circle on the air distribution plate inclines towards the spray hole, two circulating high-temperature flue gas spray pipes are symmetrically arranged on the side wall of the disturbance section along the tangential direction of the air pipe, and the circulating high-temperature flue gas spray pipes are communicated with an exhaust air box of the thermal circulation fan. This low nitrogen combustor helps gas and air intensive mixing, can improve ignition efficiency to guarantee the stability of burning, through setting up high temperature resistant stainless steel metal layer in surely burning the section, can improve ignition efficiency and surely burn the effect to the toper shower nozzle with surely burning the radiant heat transmission in the section, guarantee combustion efficiency. Through set up circulation high temperature flue gas spray tube on the lateral wall at the disturbance section, when strengthening the flame disturbance, reduce the excess air coefficient, improve combustion efficiency and restrain the formation of nitrogen oxide.
Preferably, the ammonia-free denitration catalyst is a semi-coke catalyst and is used for ensuring the reaction efficiency of the methane and the nitrogen oxides in the flue gas.
Preferably, an inlet and an outlet of the ammonia-free denitration region are respectively provided with an isolation adjusting door, the isolation adjusting doors are used for adjusting the amount of flue gas entering the ammonia-free denitration region, the amount of flue gas entering the ammonia-free denitration region can be adjusted according to the original emission concentration of nitrogen oxides in the tail gas flue gas, and the concentration of nitrogen oxides in the flue gas does not exceed the standard, so that the ammonia-free denitration region can be isolated, and the service life of the ammonia-free denitration catalyst in the ammonia-free denitration region is prolonged.
Preferably, the air inlet pipes of the graded air supply outlet and the disturbance air inlet are respectively provided with a regulating valve, the graded air supply quantity and the disturbance air quantity can be regulated according to the load of the gas-fired boiler and the change of the temperature and the flow field in the combustion chamber, and the air quantity supply of each graded air supply outlet and the disturbance air inlet under the corresponding load is determined through debugging, so that the low-nitrogen emission is realized.
The invention also comprises other devices, components or steps which can enable the low-nitrogen combustion process of the gas boiler to be normally used, and the devices, components or steps are conventional technical means in the field; in addition, means, components or steps that are not limited in this invention are taken to be conventional in the art.
The working principle of the invention is that a low-oxygen combustion area is arranged at the bottom of a combustion chamber of a gas boiler, an oxygen-enriched combustion area is arranged at the middle upper part of the combustion chamber, so that the low-temperature combustion states of the low-oxygen combustion and the oxygen-enriched combustion are distributed in a combustion system in a partition mode, the ignition stability and the low-nitrogen combustion of the low-oxygen combustion area can be ensured by arranging a low-nitrogen combustor, the heat load distribution in the combustion chamber is more uniform by a side combustor, the stability of a temperature field in the whole combustion chamber is favorably maintained, the complete combustion of fuel in the oxygen-enriched combustion area is facilitated by arranging a grading air supply outlet in the oxygen-enriched combustion area, the disturbance of flue gas is strengthened, high-temperature flue gas in a tail flue is caused to flow back into the combustion chamber through a forced flue gas recirculation pipeline, the combustion heat flow density can be reduced, the combustion mean temperature in the combustion chamber is reduced, the generation concentration of, when the load fluctuation of the gas-fired boiler is large and the low-nitrogen combustion in the combustion chamber is unstable, under the action of the ammonia-free catalyst, the nitrogen oxide in the flue gas reacts with the methane sprayed into the ammonia-free denitration region, so that the denitration effect is ensured, and the problem of ammonia pollution is avoided.
The process has the advantages that low-nitrogen combustion and ammonia-free denitration can be realized, the denitration cost of the gas boiler can be reduced, and the problem of ammonia pollution caused by ammonia denitration is avoided.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of a process arrangement of the present invention.
FIG. 2 is a schematic view of a low-nitrogen burner according to the present invention.
Detailed Description
The present invention will be described more clearly with reference to the accompanying drawings, which are included to illustrate and not to limit the present invention. All other embodiments, which can be obtained by those skilled in the art without any inventive step based on the embodiments of the present invention, should be included in the scope of the present invention.
Examples
As shown in figures 1-2, the invention provides a low-nitrogen combustion process of a gas boiler, wherein the gas boiler comprises a combustion chamber 1 and a tail flue 2, and a combustion area at the bottom and an oxygen-enriched combustion area at the middle upper part are formed by adopting zoned combustion in the combustion chamber 1; an isolatable ammonia-free denitration area 3 is arranged in the tail flue 2, a low-nitrogen burner 4 is arranged in the oxygen-poor combustion area, a multi-layer side burner 5 and a graded air supply outlet 6 are arranged in the oxygen-rich combustion area to form a graded combustion state with different heat flux densities, high-temperature flue gas in the tail flue 2 flows back into the combustion chamber 1 through a forced flue gas recirculation pipeline 7 to reduce the combustion heat flux density and reduce the combustion mean temperature in the combustion chamber 1, an ammonia-free denitration catalyst is arranged in the ammonia-free denitration area 3, a methane spray grid is arranged above the ammonia-free denitration catalyst, and the methane spray grid is connected with a methane supply system outside the tail flue 2.
The combustion chamber 1 is internally provided with a disturbance air port 8 in an area with high combustion heat current density, one end of the forced flue gas recirculation pipeline 7 is communicated with an outlet of the tail flue 2, the forced flue gas recirculation pipeline 7 is provided with a thermal circulation fan 9 close to an outlet end of the tail flue 2, an exhaust air box 10 of the thermal circulation fan 9 is communicated with the disturbance air port 8 through an air distribution pipeline, high-temperature flue gas flows back through the disturbance air port 8, the heat current density in the combustion chamber 1 can be reduced, heat energy in partial flue gas is recycled, and the dual effects of low nitrogen and energy-saving combustion are achieved.
The low-nitrogen combustor 4 comprises a gas pipe 4-1 and a cylindrical air pipe 4-2, a gas distribution section, a stable combustion section and a disturbance section are sequentially arranged in the air pipe 4-2 along the air flowing direction, the gas inlet end of the gas pipe 4-1 is led in from the side wall of the gas distribution section, the tail end of the gas distribution section is provided with a gas distribution disc 4-3, the stable combustion section is provided with a high-temperature resistant stainless steel metal layer 4-4 and an ignition hole, an extractable igniter 4-5 is arranged in the ignition hole, the gas outlet end of the gas pipe 4-1 penetrates through the gas distribution disc 4-3 and is coaxially arranged with the air pipe 4-2, the gas outlet end of the gas pipe 4-1 is provided with a conical nozzle, the conical nozzle is uniformly distributed with spray holes, at least two circles of flow equalizing holes are arranged on the gas distribution disc 4-3, and the exhaust port of the innermost circle of the flow equalizing holes on the gas distribution disc 4-3 inclines, two circulating high-temperature flue gas spray pipes 4-6 are symmetrically arranged on the side wall of the disturbance section along the tangential direction of the air pipe 4-2, and the circulating high-temperature flue gas spray pipes 4-6 are communicated with an exhaust air box 10 of a thermal circulation fan 9. This low-nitrogen burner 4 helps gas and air intensive mixing, can improve ignition efficiency to guarantee the stability of burning, through setting up high temperature resistant stainless steel metal layer 4-4 in surely burning the section, can improve ignition efficiency and surely burn the effect to the toper shower nozzle with surely burning the radiant heat transmission in the section, guarantee combustion efficiency. The side wall of the disturbance section is provided with the circulating high-temperature flue gas spray pipes 4-6, so that flame disturbance is enhanced, the excess air coefficient is reduced, the combustion efficiency is improved, and the generation of nitrogen oxides is inhibited.
The ammonia-free denitration catalyst adopts a semi-coke catalyst and is used for ensuring the reaction efficiency of the methane and the nitrogen oxides in the flue gas. An inlet and an outlet of the ammonia-free denitration area 3 are respectively provided with an isolation adjusting door, the isolation adjusting doors are used for adjusting the amount of flue gas entering the ammonia-free denitration area 3, the amount of flue gas entering the ammonia-free denitration area 3 can be adjusted according to the original emission concentration of nitrogen oxides in tail gas flue gas, and the concentration of nitrogen oxides in the flue gas does not exceed the standard, so that the ammonia-free denitration area 3 can be isolated, and the service life of an ammonia-free denitration catalyst in the ammonia-free denitration area 3 is prolonged. The air inlet pipes of the grading air supply outlets 6 and the disturbance air outlets 8 are provided with regulating valves, the grading air supply quantity and the disturbance air quantity can be regulated according to the load of the gas-fired boiler and the change of the temperature and the flow field in the combustion chamber 1, and the air quantity supply of the grading air supply outlets 6 and the disturbance air outlets 8 under the corresponding load is determined through debugging, so that the low-nitrogen emission is realized.
The working principle of the invention is that the bottom of a combustion chamber 1 of a gas boiler is provided with an oxygen-poor combustion area, the middle upper part is provided with an oxygen-rich combustion area, the low-temperature combustion states of the oxygen-poor combustion and the oxygen-rich combustion are distributed in a combustion system in a subarea way, the ignition stability and the low-nitrogen combustion of the oxygen-poor combustion area can be ensured by arranging a low-nitrogen combustor 4, the heat load distribution in the combustion chamber 1 is more uniform by a side combustor 5, the stability of a temperature field in the whole combustion chamber 1 is favorably maintained, the complete combustion of fuel in the oxygen-rich combustion area is facilitated by arranging a grading air supply outlet 6 in the oxygen-rich combustion area, the disturbance of the flue gas is strengthened, the high-temperature flue gas in a tail flue 2 flows back into the combustion chamber 1 through a forced flue gas recirculation pipeline 7, the combustion heat flow density can be reduced, the combustion mean temperature in the combustion chamber 1 is reduced, through setting up isolatable no ammonia denitration district 3 at afterbody flue 2, when gas boiler load fluctuation is big, low nitrogen burning unstable in the combustion chamber 1, thereby under the effect of no ammonia catalyst, thereby it guarantees the denitration effect to make nitrogen oxide in the flue gas react with the methane that spouts in no ammonia denitration district 3 to avoid ammonia pollution problem.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (6)
1. The utility model provides a gas boiler low nitrogen combustion technology, gas boiler includes combustion chamber and afterbody flue, its characterized in that: the combustion chamber is internally combusted in a subarea mode to form a bottom oxygen-poor combustion area and a middle-upper oxygen-rich combustion area; the method comprises the steps of arranging an isolatable ammonia-free denitration area in a tail flue, arranging a low-nitrogen burner in an oxygen-poor combustion area, arranging a multi-layer side burner and a graded air supply outlet in an oxygen-rich combustion area to form a graded combustion state with different heat flux densities, enabling high-temperature flue gas in the tail flue to flow back into a combustion chamber through a forced flue gas recirculation pipeline to reduce the combustion heat flux density and reduce the combustion mean temperature in the combustion chamber, arranging an ammonia-free denitration catalyst in the ammonia-free denitration area, arranging a methane spraying grid above the ammonia-free denitration catalyst, and connecting the methane spraying grid with a methane supply system outside the tail flue.
2. The gas boiler low-nitrogen combustion process according to claim 1, characterized in that: and a disturbance air port is arranged in an area with high combustion heat flux density in the combustion chamber, one end of the forced flue gas recirculation pipeline is communicated with an outlet of the tail flue, a thermal circulation fan is arranged at the outlet end, close to the tail flue, of the forced flue gas recirculation pipeline, and an exhaust air box of the thermal circulation fan is communicated with the disturbance air port through an air distribution pipeline.
3. The low-nitrogen combustion process of a gas boiler as set forth in claim 2, wherein: the low-nitrogen burner comprises a gas pipe and a cylindrical air pipe, a gas distribution section, a stable combustion section and a disturbance section are sequentially arranged in the air pipe along the air flowing direction, the gas inlet end of the gas pipe is led in from the side wall of the gas distribution section, the tail end of the gas distribution section is provided with a gas distribution disc, the stable combustion section is provided with a high-temperature resistant stainless steel metal layer and an ignition hole, an igniter capable of being pulled out is arranged in the ignition hole, the gas outlet end of the gas pipe passes through the gas distribution disc and is coaxial with the air pipe, and the gas outlet end of the gas pipe is provided with a conical spray head, spray holes are evenly distributed on the conical spray head, the gas distribution plate is at least provided with two circles of flow equalizing holes, and the exhaust port of the air equalizing hole at the innermost circle on the air distribution plate inclines towards the spray hole, two circulating high-temperature flue gas spray pipes are symmetrically arranged on the side wall of the disturbance section along the tangential direction of the air pipe, and the circulating high-temperature flue gas spray pipes are communicated with an exhaust air box of the thermal circulation fan.
4. The gas boiler low-nitrogen combustion process according to claim 2, characterized in that: and regulating valves are arranged on the air inlet pipes of the grading air supply outlet and the disturbance air inlet.
5. The gas boiler low-nitrogen combustion process according to claim 1, characterized in that: the ammonia-free denitration catalyst is a semi-coke catalyst.
6. The gas boiler low-nitrogen combustion process according to claim 1, characterized in that: and an inlet and an outlet of the ammonia-free denitration area are respectively provided with an isolation adjusting door, and the isolation adjusting doors are used for adjusting the amount of flue gas entering the ammonia-free denitration area.
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| CN202110201702.6A CN112984501B (en) | 2021-02-23 | 2021-02-23 | Low-nitrogen combustion process of gas boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT3684U1 (en) * | 1998-11-09 | 2000-06-26 | Schwarz A & Co | MIXING DEVICE FOR GAS AND OIL BURNERS |
| CN203564958U (en) * | 2013-09-27 | 2014-04-30 | 中石化宁波工程有限公司 | Ammonia injection grid for flue gas denitration |
| CN105805730A (en) * | 2016-05-27 | 2016-07-27 | 青岛金田热电有限公司 | Circulating fluidized bed boiler system for achieving low nitrogen oxide discharge |
| CN106122945A (en) * | 2016-06-27 | 2016-11-16 | 江苏中圣高科技产业有限公司 | A kind of low-NOx coal powder system and method |
| CN107477570A (en) * | 2017-07-21 | 2017-12-15 | 中航世新燃气轮机股份有限公司沈阳分公司 | The ultralow discharged nitrous oxides process of ethane cracking furnace combustion system |
| CN208186342U (en) * | 2018-05-04 | 2018-12-04 | 唐山金沙燃烧热能股份有限公司 | Low NO is recycled in flue gas |
| CN109764354A (en) * | 2018-12-11 | 2019-05-17 | 天津钢铁集团有限公司 | A kind of low nitrogen burning control method |
| CN111120980A (en) * | 2020-01-06 | 2020-05-08 | 华中科技大学 | Cogeneration system and method for realizing efficient waste heat recovery and low nitrogen emission |
-
2021
- 2021-02-23 CN CN202110201702.6A patent/CN112984501B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT3684U1 (en) * | 1998-11-09 | 2000-06-26 | Schwarz A & Co | MIXING DEVICE FOR GAS AND OIL BURNERS |
| CN203564958U (en) * | 2013-09-27 | 2014-04-30 | 中石化宁波工程有限公司 | Ammonia injection grid for flue gas denitration |
| CN105805730A (en) * | 2016-05-27 | 2016-07-27 | 青岛金田热电有限公司 | Circulating fluidized bed boiler system for achieving low nitrogen oxide discharge |
| CN106122945A (en) * | 2016-06-27 | 2016-11-16 | 江苏中圣高科技产业有限公司 | A kind of low-NOx coal powder system and method |
| CN107477570A (en) * | 2017-07-21 | 2017-12-15 | 中航世新燃气轮机股份有限公司沈阳分公司 | The ultralow discharged nitrous oxides process of ethane cracking furnace combustion system |
| CN208186342U (en) * | 2018-05-04 | 2018-12-04 | 唐山金沙燃烧热能股份有限公司 | Low NO is recycled in flue gas |
| CN109764354A (en) * | 2018-12-11 | 2019-05-17 | 天津钢铁集团有限公司 | A kind of low nitrogen burning control method |
| CN111120980A (en) * | 2020-01-06 | 2020-05-08 | 华中科技大学 | Cogeneration system and method for realizing efficient waste heat recovery and low nitrogen emission |
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| Publication number | Publication date |
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| CN112984501B (en) | 2024-02-20 |
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