CN110925747A - Combustion device convenient for reducing NOx by directly spraying coal water slurry into low-oxygen flame - Google Patents
Combustion device convenient for reducing NOx by directly spraying coal water slurry into low-oxygen flame Download PDFInfo
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- CN110925747A CN110925747A CN201911315430.1A CN201911315430A CN110925747A CN 110925747 A CN110925747 A CN 110925747A CN 201911315430 A CN201911315430 A CN 201911315430A CN 110925747 A CN110925747 A CN 110925747A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 239000003245 coal Substances 0.000 title claims abstract description 84
- 239000002002 slurry Substances 0.000 title claims abstract description 82
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 42
- 239000001301 oxygen Substances 0.000 title claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 21
- 238000005507 spraying Methods 0.000 title abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 43
- 239000000843 powder Substances 0.000 claims abstract description 34
- 239000007921 spray Substances 0.000 claims abstract description 26
- 238000000197 pyrolysis Methods 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000006722 reduction reaction Methods 0.000 claims description 13
- 239000000446 fuel Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000003250 coal slurry Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- 239000004480 active ingredient Substances 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 206010021143 Hypoxia Diseases 0.000 claims 2
- 208000018875 hypoxemia Diseases 0.000 claims 1
- 230000001146 hypoxic effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010298 pulverizing process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010531 catalytic reduction reaction Methods 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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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
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
- F23C1/10—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air liquid and pulverulent fuel
-
- 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
- F23C7/02—Disposition of air supply not passing through burner
-
- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to a combustion device convenient for directly spraying coal water slurry to reduce NOx in low-oxygen flame, which comprises a coal water slurry supply mechanism provided with a coal water slurry output main pipe, and a combustion mechanism provided with a high-position separation air nozzle, a low-position separation air nozzle, a coal water slurry spray gun, a powder air and powder supply nozzle and an air and hot air supply nozzle. Through reasonable structure innovation design, the method for reducing NOx generated in the boiler and inhibiting the generation of thermal NOx by only utilizing the method that coal water slurry prepared by conventional coal of the boiler is subjected to pyrolysis reaction in the boiler to generate active pyrolysis gas is realized, the concentration of NOx in flue gas is effectively reduced, the limitation of the traditional NOx reduction technology is broken through, the low-nitrogen emission requirement of the boiler is also met under the condition of low cost, the method is scientific and reasonable, the structure is simple and easy to implement, the work is reliable, the daily use cost is low, the operation management and the low-cost high-efficiency production of enterprises are facilitated, and the practicability is strong.
Description
Technical Field
The invention relates to the technical field of boiler combustion devices, in particular to a combustion device convenient for directly spraying coal water slurry into low-oxygen flame to reduce NOx.
Background
In the low NOx combustion technology of the coal-fired boiler of the power station which is widely applied at present and relatively mature, the low nitrogen emission requirement of GB13223-2011 national standard can be met only by matching with a tail flue gas denitration measure, the NOx is reduced by mainly spraying an ammonia reducing agent into the tail flue gas of the boiler, wherein a Selective Catalytic Reduction (SCR) technology and a selective non-catalytic reduction (SNCR) technology are taken as main technologies. The selective non-catalytic reduction (SNCR) technology has the disadvantages that the related structure is relatively simple, the investment cost is low, and the related structure is easy to modify and install on the existing boiler and is more in application, so that the reaction temperature window is narrow, the ammonia escape phenomenon is serious, the reduction efficiency is limited, and the utilization rate of an ammonia reducing agent is low; while the Selective Catalytic Reduction (SCR) technology has relatively high denitration efficiency, but has relatively complex structure, great difficulty in modification and installation on the existing boiler, high investment cost, short service life of the catalyst and serious secondary pollution, so that application limitation exists. Therefore, from practicality and economic nature perspective, the application of these two kinds of techniques all has the limitation at present, so it is necessary to research and develop a simple structure and scientific and reasonable, the denitrogenation effect is showing and investment and daily running cost all lower, easily reform transform the novel burner of installation on current coal fired boiler to satisfy the low nitrogen up to standard user demand of present trade, alleviate a big problem of present puzzlement industry.
Disclosure of Invention
The invention aims to solve the defects of the conventional coal-fired boiler of the power station in the standard of finishing ultralow NOx emission, and provides a novel combustion device which is convenient for directly spraying coal water slurry into low-oxygen flame, reducing and reducing the generation amount of NOx and is beneficial to the standard of low-nitrogen emission of the coal-fired boiler.
The invention discloses a combustion device convenient for directly spraying water-coal-slurry to reduce NOx in low-oxygen flame, which is characterized in that a main body comprises a water-coal-slurry supply mechanism, a combustion mechanism, a high-pressure fan and a pulverizing system, wherein:
the coal water slurry supply mechanism mainly comprises a coal water slurry preparation device, a coal water slurry flow control valve, a coal water slurry filter, a coal water slurry booster pump and a coal water slurry output main pipe which are sequentially arranged on an output pipeline of the coal water slurry preparation device;
the combustion mechanism mainly comprises a high-level separation air nozzle, a low-level separation air nozzle, a coal water slurry spray gun and a main burner which are sequentially arranged on the wall of the hearth from top to bottom;
the main burner is arranged below the water-coal-slurry spray gun 23 and mainly comprises air powder nozzles and hot air nozzles which are arranged at intervals in a staggered manner, an air powder supply channel with one end connected with the pulverizing system and the other end connected with the tail ends of the air powder nozzles, and a boiler bellows respectively connected with the air inlet ends of the hot air nozzles and the air inlet ends of the low-level separation air nozzles;
the high-position separation air nozzle is arranged above the low-position separation air nozzle, and the air inlet end of the high-position separation air nozzle is connected with the high-pressure fan pipeline through an airflow control valve;
the coal water slurry spray gun is arranged above the nozzle arrangement position of the main burner in a layered mode and comprises 8 spray guns, the main body of each spray gun is fixedly arranged at four corners of a hearth and on the central positions of the walls of four side walls of the hearth, and the feed ends of the coal water slurry spray guns are connected with the coal water slurry output main pipe in the coal water slurry supply mechanism respectively;
in addition, the designed wind speed of the high-speed airflow ejected by the high-position separation wind nozzle is greater than or equal to 80 m/s; the air supply quantity from the high-level separation air nozzle and the low-level separation air nozzle to the furnace accounts for 35-40% of the total air quantity required by the hearth.
When the device works, the air-powder mixed gas is sprayed into the furnace through the air-powder nozzle connected with the powder making system through the air-powder gas supply channel, hot air is sprayed into the furnace through the hot air nozzle connected with the air box of the boiler, the air-powder mixed gas and the hot air are mixed and combusted, and a fuel-rich main combustion area with the oxygen content less than 1% and the temperature of 1300 plus 1500 ℃ is formed in the hearth; the low-level separation air nozzle which is connected with a boiler air box and positioned above the main burner air powder nozzle and the hot air nozzle sprays hot air into the boiler to participate in combustion to form a lean fuel burnout zone positioned above the main combustion zone; high-speed coal water slurry sprayed out by a coal water slurry spray gun connected with a coal water slurry output main pipe at the tail end is directly sprayed into the smoke ascending air flow between the main combustion area and the burnout area, so that the coal water slurry is subjected to pyrolysis reaction rapidly in a high-temperature and low-oxygen environment with the oxygen content of less than 1% and the temperature of 1300 ℃ to 1500 ℃ to generate pyrolysis gas containing reduction active ingredients, and the pyrolysis gas and NOx generated in the smoke flow are subjected to reduction reaction to reduce the concentration of NOx in the smoke, and a large amount of water vapor generated in the coal water slurry during the water evaporation in the pyrolysis reaction reduces the flame peak value of the combustion area and inhibits the generation of thermal NOx; the high-speed airflow from the high-pressure fan sprayed by the high-position separation air nozzle positioned above the low-position separation air nozzle is sprayed into the upper area of the hearth, the flow field of the upper part of the hearth is optimized, the generation of local high temperature in the hearth is avoided, and the generation amount of NOx is favorably inhibited.
The combustion device convenient for directly spraying the coal water slurry to reduce NOx in the low-oxygen flame based on the conception creates a low-oxygen and high-temperature combustion environment with oxygen less than 1% in a combustion area of a hearth by reasonably adjusting the setting position and air distribution ratio of the fuel and combustion-supporting air nozzles on the structure, and combines a method of directly spraying the high-speed coal water slurry to the area, so that the coal water slurry carries out pyrolysis reaction in the low-oxygen combustion environment to generate pyrolysis gas which contains reduction active ingredients and can effectively reduce NOx generated in smoke, and the evaporation of water in the coal water slurry is more beneficial to promoting the pyrolysis reaction: o + H2O → OH + OH, the increase of the number of OH ions in the flue gas is enhanced with the reduction effect of NO:
1 and 2, and simultaneously, a large amount of water vapor generated when water in the coal water slurry is evaporated has the effect of reducing the flame peak value of a combustion area, thereby being beneficial to inhibiting the generation of thermal NOx; in addition, because the high-position separation air nozzle is arranged above the pulverized coal injection area, the high-speed jet formed by the high-speed separation air injected by the high-position separation air nozzleThe flow penetrates through the ascending cyclone flue gas generated in the lower combustion area to participate in combustion, so that CO and coke particles which are not completely combusted in the flue gas are further and fully combusted, the generation of local high temperature in a hearth is inhibited, the generation amount of NOx is reduced, and the combustion efficiency of the boiler is ensured. Therefore, the invention creates conditions for the coal water slurry to carry out pyrolysis reaction by reasonable method innovation and structural design, reduces NOx generated in flue gas by utilizing pyrolysis gas containing reduction active ingredients generated in the coal water slurry pyrolysis reaction, inhibits the generation of thermal NOx by utilizing water vapor generated in the coal water slurry pyrolysis reaction, and generates the positive technical effect of reducing the concentration of NOx in the flue gas discharged by the boiler by only utilizing the coal water slurry prepared by the conventional coal powder of the traditional coal-fired boiler in the organic combination of the structure and the method, so that the coal water slurry is subjected to the pyrolysis reaction in the boiler, and the generated NOx is reduced and the generation of the NOx is inhibited by utilizing the generated active pyrolysis gas, meanwhile, the invention breaks through the limitation of the traditional NOx reduction technology, avoids the trouble of purchasing reducing agent types and producing areas of enterprises, is beneficial to the operation management of the enterprises, and obviously reduces the daily production cost, the method is scientific and reasonable, simple in structure, easy to implement, reliable in work and low in daily use cost, utilizes the fuel to process, enables the fuel to have the effect of the reducing agent, and achieves the low-nitrogen emission requirement of the boiler under the condition of avoiding using the traditional reducing agent.
Drawings
FIG. 1 is a schematic diagram of the general structure of an embodiment of the present invention;
FIG. 2 is a schematic structural view of a main burner in an embodiment of the present invention;
FIG. 3 is a schematic diagram of the layout of a coal-water slurry spray gun according to an embodiment of the invention.
In the figure:
1. coal water slurry supply mechanism 11, coal water slurry preparation device 12, coal water slurry flow control valve
13. Coal water slurry filter 14, coal water slurry booster pump 15, coal water slurry output main pipe
2. Combustion mechanism 21, high-position separation air nozzle 22 and low-position separation air nozzle
23. Coal water slurry spray gun 231, feed end 24, main burner 241 and air powder nozzle
242. Hot air nozzle 243, air powder supply channel 244, boiler bellows 3 and high-pressure fan
31. Airflow control valve 4, pulverizing system 5, furnace
Detailed Description
The invention will be further described with reference to the figures and the exemplary embodiments.
In fig. 1, 2 and 3, the combustion apparatus for reducing NOx by directly injecting coal water slurry into a low-oxygen flame according to the present invention is characterized in that the main body comprises a coal water slurry supply mechanism 1, a combustion mechanism 2, a high pressure fan 3 and a pulverizing system 4, wherein:
the coal water slurry supply mechanism 1 mainly comprises a coal water slurry preparation device 11, a coal water slurry flow control valve 12, a coal water slurry filter 13, a coal water slurry booster pump 14 and a coal water slurry output main pipe 15 which are sequentially arranged on an output pipeline of the coal water slurry preparation device 11;
the combustion mechanism 2 mainly comprises a high-level separation air nozzle 21, a low-level separation air nozzle 22, a coal water slurry spray gun 23 and a main burner 24 which are sequentially arranged on the wall of the hearth 5 from top to bottom;
the main burner 24 is arranged below the water-coal-slurry spray gun 23 and mainly comprises air-powder nozzles 241 and hot air nozzles 242 which are arranged at intervals in a staggered manner, an air-powder air supply channel 243 with one end connected with the pulverizing system 4 and the other end connected with the tail ends of the air-powder nozzles 241, and a boiler air box 244 respectively connected with the air inlet ends of the hot air nozzles 242 and the air inlet end of the low-level separation air nozzle 22;
the high-position separation air nozzle 21 is arranged above the low-position separation air nozzle 22, and the air inlet end of the high-position separation air nozzle is connected with a pipeline of the high-pressure fan 3 through an airflow control valve 31;
the coal water slurry spray gun 23 is arranged above the nozzle arrangement position of the main burner 24 in a layered mode, and comprises 8 spray guns, the main bodies of which are fixedly arranged at four corners of a hearth 5 and on the central positions of the walls of four side walls, respectively, and the feed end 231 of the coal water slurry spray gun 23 is connected with the coal water slurry output main pipe 15 in the coal water slurry supply mechanism 1 respectively;
in addition, the designed wind speed of the high-speed airflow ejected by the high-position separation wind nozzle 21 is greater than or equal to 80 m/s; the air supply quantity of the high-level separation air nozzle 21 and the low-level separation air nozzle 22 to the furnace accounts for 35-40% of the total air quantity required by the hearth.
When the device works, the air-powder mixed gas is sprayed into the furnace through the air-powder nozzle 241 connected with the powder making system 4 through the air-powder gas supply channel 243, the hot air is sprayed into the furnace through the hot air nozzle 242 connected with the boiler air box 244, and the air-powder mixed gas and the hot air are mixed and combusted, so that a fuel-rich main combustion area with the oxygen content less than 1% and the temperature of 1300-1500 ℃ is formed in the hearth; the low-level separation air nozzle 22 which is connected with a boiler air box 244 and is positioned above an air powder nozzle 241 and a hot air nozzle 242 of a main burner 24 sprays hot air into the boiler to participate in combustion, so as to form a lean fuel burnout zone positioned above a main combustion zone; the high-speed coal water slurry sprayed out by a coal water slurry spray gun 23 connected with the coal water slurry output main pipe 15 at the tail end is directly sprayed into the smoke ascending air flow between the main combustion area and the burnout area, so that the coal water slurry is subjected to pyrolysis reaction rapidly in a high-temperature and low-oxygen environment with the oxygen content of less than 1 percent and the temperature of 1300 ℃ and 1500 ℃ to generate pyrolysis gas containing reduction active ingredients, and the pyrolysis gas and NOx generated in the smoke flow are subjected to reduction reaction to reduce the concentration of NOx in the smoke, and a large amount of water vapor generated in the coal water slurry during the water evaporation in the pyrolysis reaction reduces the flame peak value of the combustion area and inhibits the generation of thermal NOx; the high-speed airflow from the high-pressure fan 3 sprayed by the high-position separation air nozzle 21 above the low-position separation air nozzle 22 is sprayed into the upper area of the hearth, so that the flow field of the upper part of the hearth is optimized, the generation of local high temperature in the hearth is avoided, and the generation amount of NOx is favorably inhibited.
Claims (3)
1. The utility model provides a burner convenient to direct injection coal slurry reduction NOx in to hypoxemia flame which characterized in that main part includes coal slurry feed mechanism (1), combustion mechanism (2), high pressure positive blower (3) and powder process system (4), wherein:
the coal water slurry supply mechanism (1) mainly comprises a coal water slurry preparation device (11), a coal water slurry flow control valve (12), a coal water slurry filter (13), a coal water slurry booster pump (14) and a coal water slurry output main pipe (15) which are sequentially arranged on an output pipeline of the coal water slurry preparation device (11);
the combustion mechanism (2) mainly comprises a high-level separation air nozzle (21), a low-level separation air nozzle (22), a coal water slurry spray gun (23) and a main burner (24) which are sequentially arranged on the wall of the hearth (5) from top to bottom;
the main burner (24) is arranged below the water-coal-slurry spray gun (23), and mainly comprises air-powder nozzles (241) and hot air nozzles (242) which are arranged at intervals in a staggered manner, an air-powder air supply channel (243) with one end connected with the powder making mechanism (4) and the other end connected with the tail ends of the air-powder nozzles (241), and a boiler air box (244) which is respectively connected with the air inlet end of the hot air nozzle (242) and the air inlet end of the low-level separation air nozzle (22);
the high-position separation air nozzle (21) is arranged above the low-position separation air nozzle (22), and the air inlet end of the high-position separation air nozzle is connected with a pipeline of the high-pressure fan (3) through an airflow control valve (31);
the coal water slurry spray gun (23) is arranged above the nozzle arrangement position of the main burner (24) in a layered mode and comprises 8 spray guns, the main bodies of the 8 spray guns are fixedly arranged at four corners of a hearth (5) and on the central positions of the walls of four side walls respectively, and the feed end (231) of the coal water slurry spray gun (23) is connected with the coal water slurry output main pipe (15) in the coal water slurry supply mechanism (1) respectively;
when the device works, air-powder mixed gas is sprayed into the furnace through an air-powder nozzle (241) connected with the powder making mechanism (4) through an air-powder gas supply channel (243), hot air is sprayed into the furnace through a hot air nozzle (242) connected with a boiler bellows (244), the air-powder mixed gas and the hot air are mixed and combusted, and a fuel-rich main combustion area with the oxygen content less than 1% and the temperature of 1300 and 1500 ℃ is formed in a hearth; the low-level separation air nozzle (22) which is connected with a boiler air box (244) and positioned above an air powder nozzle (241) and a hot air nozzle (242) of a main burner (24) sprays hot air into the boiler to participate in combustion, so that a fuel-lean burnout zone positioned above a main combustion zone is formed; high-speed coal water slurry sprayed out by a coal water slurry spray gun (23) connected with a coal water slurry output main pipe (15) at the tail end is directly sprayed into flue gas updraft between the main combustion area and the burnout area, so that the coal water slurry is subjected to pyrolysis reaction rapidly in a high-temperature and low-oxygen environment with the oxygen content of less than 1% and the temperature of 1300-1500 ℃ to generate pyrolysis gas containing reduction active ingredients, and the pyrolysis gas and NOx generated in the flue gas flow are subjected to reduction reaction to reduce the concentration of NOx in the flue gas, and a large amount of water vapor generated in the coal water slurry during the evaporation of water in the pyrolysis reaction reduces the flame peak value of the combustion area and inhibits the generation of thermal NOx; the high-speed airflow from the high-pressure fan (3) sprayed by the high-position separation air nozzle (21) positioned above the low-position separation air nozzle (22) is sprayed into the upper area of the hearth, the flow field on the upper part of the hearth is optimized, the generation of local high temperature in the hearth is avoided, and the generation amount of NOx is favorably inhibited.
2. The combustion apparatus for facilitating the direct injection of coal-water slurry into a hypoxic flame for the reduction of NOx according to claim 1, wherein the high-level separation air nozzle (21) is designed to inject a high-velocity air stream with a velocity greater than or equal to 80 m/s.
3. The combustion device for reducing NOx by directly injecting coal water slurry into low-oxygen flame as claimed in claim 1, wherein the air supply rate of said high position separation air nozzle (21) and said low position separation air nozzle (22) to the furnace is 35-40% of the total air rate required by the hearth.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911315430.1A CN110925747B (en) | 2019-12-19 | 2019-12-19 | Combustion device convenient for directly injecting coal water slurry into low-oxygen flame to reduce NOx |
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| CN201911315430.1A CN110925747B (en) | 2019-12-19 | 2019-12-19 | Combustion device convenient for directly injecting coal water slurry into low-oxygen flame to reduce NOx |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112032709A (en) * | 2020-08-30 | 2020-12-04 | 国电内蒙古东胜热电有限公司 | Ultra-low NOx emission system and method using pre-pyrolysis in combination with ammonia injection |
| CN112082157A (en) * | 2020-09-04 | 2020-12-15 | 上海交通大学 | Water-coal-slurry nozzle with high-pressure steam |
| CN114923170A (en) * | 2022-06-17 | 2022-08-19 | 神华准格尔能源有限责任公司 | Method for adjusting bed temperature of circulating fluidized bed boiler |
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