CN204420998U - A kind of low NOx combustion apparatus from preheating and coal dust sectional combustion - Google Patents

A kind of low NOx combustion apparatus from preheating and coal dust sectional combustion Download PDF

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Publication number
CN204420998U
CN204420998U CN201420828333.9U CN201420828333U CN204420998U CN 204420998 U CN204420998 U CN 204420998U CN 201420828333 U CN201420828333 U CN 201420828333U CN 204420998 U CN204420998 U CN 204420998U
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China
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combustion
air
circular passage
precombustion chamber
coal dust
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CN201420828333.9U
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王欢
王民发
许洪臣
郎凤娥
郎鹏德
张宗旺
杨元博
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Environmental Science Research Institute Co Ltd Beijing Zhongaotong
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SHANXI LANTIAN ENVIRONMANTAL ENGINEERING Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The utility model discloses a kind of low NOx combustion apparatus from preheating and coal dust sectional combustion, this device comprises the precombustion chamber be connected on boiler wall with refractory lining, refracto, primary air piping coaxially sheathed outside central tube and central tube is provided with in the front end of precombustion chamber, passage between central tube and primary air piping is First air circular passage, Secondary Air circular passage is provided with outside primary air piping, outside precombustion chamber, be arranged with tertiary air circular passage, the port of export of tertiary air circular passage is provided with tertiary air annular jet and is communicated with precombustion chamber, boiler wall with refractory lining, refracto.The utility model adopts coal powder pre-burning, flue gas recirculation, multichannel air feed, part combustion air from the sectional combustion of preheating, has that flame holding is good, flue gas NO xcontent is low, coal dust burn-off rate is high, extend coal adaptive capacity, and has the function of coal dust and gaseous fuel multifuel combustion.

Description

A kind of low NOx combustion apparatus from preheating and coal dust sectional combustion
Technical field
The utility model belongs to coal powder burning technology field, particularly relates to a kind of low NOx combustion apparatus from preheating and coal dust sectional combustion.
Background technology
Coal is the principal mode of China's energy resources, and in a foreseeable future, coal is difficult to be replaced on a large scale by fuel oil and combustion gas as the basic fuel of Industrial Boiler.The existing Industrial Boiler of China about 600,000, and with the speed increment of annual about 8000; Industrial boilers in China 85% is coal-burning boiler, year coal consumption about 700,000,000 tons, account for whole nation year by about 20% of coal total amount, its annual total energy consumption and disposal of pollutants all occupy the whole nation second.In the coal-burned industrial boiler of China, the middle-size and small-size of below 29MW accounts for major part, and based on grate furnace.Namely the industrial coal powder boiler occurred in recent years stops because it has namely to open, easily realizes the advantage that auto-control, the thermal efficiency are high, save coal consumption, has become old coal-burned industrial boiler housing reform and has made and one of leading option of newly-built coal-burned industrial boiler.Industrial coal powder boiler especially medium small boiler has the particularity that combustion space is narrow and small, fractional cold is high, steady combustion, after-flame outstanding problem, bituminous coal or the brown coal coal dust of high-quality can only be used, and the phenomenon that ubiquity flying marking is higher, the mean quality coal that resource is abundanter and region is broader cannot be suitable for; In pollutant emission, although SO 2process and dust collection have mature and reliable technical guarantee, but the discharge of NOx is but a very formidable challenge.Because industrial coal powder boiler room is subject to the restriction of system investments and operating cost, cannot as the outer NOx treatment system of the combustion gas furnace of the supporting complexity of large moulded coal electric boiler, and existing low-NO_x combustion technology effect under this particular surroundings is bad, the NOx in flue gas and discharging standards is caused to have larger gap.
Based on the feature of China's energy resources and the power savings advantages of industrial coal powder boiler, strong, the steady combustion of exploitation coal adaptability is effective, burn-off rate is suitable with large moulded coal electric boiler, NOx content can reach or close to the applicable combustion technology of discharging standards and method, for raising, the energy-saving and emission-reduction of the popularization and technology that promote industrial coal powder boiler, there is the urgency of reality.
Utility model content
The utility model discloses a kind of low NOx combustion apparatus from preheating and coal dust sectional combustion, aim to provide and a kind of there is pre-burning, flue gas recirculation and the part combustion air coal dust sectional combustion device from the high-efficiency low-pollution of preheating, the problem such as bad with the flame holding solving the existing coal powder burner of Industrial Boiler, coal adaptive capacity is limited, flying dust after-flame poor effect, smoke NOx content are higher.
The technical solution of the utility model is: a kind of low NOx combustion apparatus from preheating and coal dust sectional combustion, comprise the precombustion chamber be connected on boiler wall with refractory lining, refracto, primary air piping coaxially sheathed outside central tube and central tube is provided with in the front end of precombustion chamber, passage between central tube and primary air piping is First air circular passage, Secondary Air circular passage is provided with outside primary air piping, tertiary air circular passage is arranged with outside precombustion chamber, the port of export of tertiary air circular passage is provided with tertiary air annular jet and precombustion chamber, boiler wall with refractory lining, refracto is communicated with, wherein tertiary air in its passage through preheating to a certain degree, along becoming the direction of 5 ~ 15 ° of angles with burner axis or importing boiler furnace along the direction with burner axis being parallel by tertiary air spout, strongly mix and burning with the uncombusted pulverized coal flame from precombustion chamber at the wall with refractory lining, refracto of boiler and burner hearth.
As a kind of preferred embodiment, be coaxially provided with gas conduct pipe be communicated with precombustion chamber in central tube inside, the space between central tube and gas conduct pipe forms centre wind circular passage.
As a kind of preferred embodiment, outside Secondary Air circular passage, be also provided with circulating flue gas circular passage.
As a kind of preferred embodiment, in tertiary air circular passage, the outside of precombustion chamber, is provided with heat exchange scale.
As a kind of preferred embodiment, in the air inlet of Secondary Air circular passage and/or tertiary air circular passage, be provided with adjustable plate.
As a kind of preferred embodiment, in First air circular passage and/or Secondary Air circular passage, be provided with tangential swirl blade or axial swirler.
The implementation method of device described in the utility model is, by by the coal dust entering into precombustion chamber in First air circular passage, in precombustion chamber, first time fuel-rich combustion is carried out with the combustion air being imported to precombustion chamber by Secondary Air circular passage, coefficient of excess air controls in 0.4 ~ 0.75 scope, and flame temperature remains on 1000 ~ 1100 DEG C of levels; By the air after preheating in tertiary air circular passage, second time oxygen-enriched combusting is carried out with the unburnt pulverized coal flame of first time fuel-rich combustion in precombustion chamber, coefficient of excess air controls in 1.2 ~ 1.35 scopes, flame temperature remain on 1200 ~ 1350 DEG C middle warm water put down.Be exactly specifically: coal dust is via First air circular passage, precombustion chamber is introduced with eddy flow or direct current mode, simultaneously, part combustion air imports precombustion chamber by Secondary Air circular passage via overfire air port with cyclone mode, and mix with primary wind and powder air-flow, after lighting, enter the First air in precombustion chamber and the oxygen in Secondary Air and coal dust generation combustion reaction, the volatile matter fuel gas that the existing coal dust cracking of combustion reaction in precombustion chamber goes out participates in, the complete combustion reaction of the incomplete sum of carbon is had again to participate in, simultaneously also along with reduction and the oxidation of some other gaseous state and solid matter, by means of accumulation of heat and the adiabatic environment of precombustion chamber, can realize coal dust to light with incipient flame smoothly continual and steady, accelerate the combustion velocity of coal dust and increase fire stroke, coal dust completes the combustion reaction of first stage or claims primary combustion in precombustion chamber, it is the reducing atmosphere of fuel-rich material in precombustion chamber, its coefficient of excess air controls in 0.4 ~ 0.75 scope, to suppress the formation of fuel type NOx, and the NOx that reduction has generated, the organic nitrogen overwhelming majority contained by coal dust is made to be converted into N 2, tertiary air in its passage through preheating to a certain degree, along becoming the direction of 5 ~ 15 ° of angles with burner axis or importing boiler furnace along the direction with burner axis being parallel by tertiary air spout, strongly mix and burning with the uncombusted pulverized coal flame from precombustion chamber at the wall with refractory lining, refracto of boiler and burner hearth.This is the second stage burning of coal dust firing or claims second-time burning, is also the after-flame stage of coal dust, is characterized in that the oxygen of primary combustion deficiency is all provided at this by tertiary air.The coefficient of excess air of this second-time burning is 1.2 ~ 1.35, peak flame temperature < 1350 DEG C, longer along warm flame region in 1200 ~ 1350 DEG C of axis distribution, and Temperature Distribution is more even, on width, flame is relatively concentrated, be conducive to the quality between gas-solid, exchange heat, improve reaction speed, for the after-flame of coal dust creates conditions.And because flame temperature is in middle temperature category, the generation of thermal NO x effectively can be suppressed.
In order to the degree of depth reduces the content of NOx in flue gas, and there is not coking phenomenon in precombustion chamber in coal dust ash fusion point situation on the low side, the method also comprises the neat stress of the flue to import dust removal process in precombustion chamber after, this neat stress is as circulating flue gas, the temperature of circulating flue gas is 120 ~ 160 DEG C, and circulating flue gas consumption accounts for 15 ~ 30% of combustion-supporting air quantity.Wherein, circulating flue gas can import to precombustion chamber via First air circular passage as carrier together with coal dust, also can import with the root designated lane of neat stress form by precombustion chamber, the introducing of circulating flue gas is not only conducive to the regulation and control of reducing atmosphere in precombustion chamber, also the flame temperature in precombustion chamber can be controlled the proper level at 1000 ~ 1100 DEG C simultaneously, namely low-temperature burning is realized in the first stage, until coal dust after the abundant pre-burning of first stage, temperature burning in relative boundling on width is implemented in second stage, abolish the contradiction of after-flame and low both NOx, and eliminate the coking hidden danger of precombustion chamber.
For adapting to the Mixture Density Networks coal dust using the lower meager lean coal of volatile matter or bituminous coal, brown coal and meager lean coal, and the coal dust that nitrogen content own is high, the method also comprises one or more gaseous fuels imported in precombustion chamber in natural gas, coke-stove gas, liquefied petroleum gas.Wherein, gaseous fuel both can be used as the fuels sources of starting ignition, can arrange in pairs or groups again carry out gas-solid multifuel combustion with coal dust, the existence of hydrocarbon isoreactivity group and participation in gaseous fuel, significantly can reduce the growing amount of primary combustion process NOx, also can promote the stable of pulverized coal flame simultaneously.The consumption of gaseous fuel is 0 ~ 25% of burner general power, and gaseous fuel sends into precombustion chamber by the circular gas conduit be arranged in central tube.Pass into combustion air in central tube, be called centre wind, centre wind draws from combustion-supporting air header, imports precombustion chamber by central tube spout.Centre wind supplements except partial oxidation except to precombustion chamber, also has the effect being regulated precombustion chamber flame root position by the change of lip jet speed.
In addition, tertiary air contacts with the heat exchange scale in passage when flowing through tertiary air passage, and wind-warm syndrome is promoted 30 ~ 100 DEG C.The tertiary air of higher temperature is conducive to the after-flame effect improving second stage burning; and tertiary air absorbs the precombustion chamber wall heat come by the conduction of heat exchange scale; tertiary air passage inner sleeve wall temperature can be prevented too high and affect the structural strength of burner, playing the effect of cooling and protection burner.
Compared with prior art the utility model tool has the following advantages.
(1) flame holding is good: by thermal insulation and the accumulation of heat effect of precombustion chamber, even if starting ignition under cold conditions, also can realize using firing coal-dust in a small amount of combustion gas short time, and can form the good pulverized coal flame of autostability fast.
(2) flue gas NO xcontent is low: take flue gas recirculation, multichannel classification air feed and staged combustion process, part combustion air and circulating flue gas are introduced precombustion chamber and are carried out low temperature fuel-rich combustion by the first stage, flame temperature controls the scope at 1000 ~ 1100 DEG C, coefficient of excess air controls the scope 0.4 ~ 0.75, suppress the generation of fuel type NOx, create the temperature and the atmospheric condition that do not generate heating power type and Quick-type NOx, realize the organic nitrogen overwhelming majority contained by coal dust and be converted into N 2target; Second stage is introduced tertiary air and is carried out middle temperature oxygen-enriched combusting, coefficient of excess air is 1.2 ~ 1.35, the middle warm water that flame temperature controls at 1200 ~ 1350 DEG C is put down, while taking into account after-flame effect, avoid the hot conditions needed for thermal NO x generation, significantly can reduce the NOx content of burner hearth flue gas.
(3) coal dust burn-off rate is high: the coal dust experience first stage, the second stage (secondary) under burner hearth and tertiary air carry out medium temperature condition was burnt compared with the low-temperature burning of Long travel.Tertiary air through burner from preheating, temperature is promoted further, ensure that the flame temperature of second-time burning is higher than 1200 DEG C; The Relatively centralized state of flame enhances mixing of precombustion chamber exiting flue gas and tertiary air, is conducive to the heat between gas-solid, mass exchange, accelerates the burning velocity of unburned coal powder; The spatial extent of the flame that relative boundling, rigidity are good is extended, and not only improves the uniform state of Flame Temperature Distribution, and too increases the RT of possible trouble coal dust in flame.The acting in conjunction of above-mentioned three aspects, ensure that the after-flame degree of coal dust can reach or close to the level of large moulded coal electric boiler.
(4) coal adaptive capacity is extended: the utility model, by means of the thermal insulation of precombustion chamber and thermal storage effect, for the stable of pulverized coal flame provides good condition, makes it possible to use the poor coal dust of flammability; When importing combustion gas, the lower meager lean coal of volatile matter and the mixed coal powder with bituminous coal or brown coal thereof can also be used.
(5) there is the function of coal dust and gaseous fuel multifuel combustion: the utility model provides the technical scheme introducing combustion gas and coal dust multifuel combustion to precombustion chamber, the introducing of gaseous fuel is conducive to the stability increasing pulverized coal flame, can promote the further reduction of smoke NOx content, be very favorable to the NOx qualified discharge of industrial coal powder boiler simultaneously.During multifuel combustion, the research on maximum utilized quantity of gaseous fuel is 25% of burner general power.
Accompanying drawing explanation
Accompanying drawing 1 is the burner structural representation in the utility model embodiment 1.
Accompanying drawing 2 is the burner structural representation in the utility model embodiment 2.
In figure: 1. boiler wall with refractory lining, refracto, 2. tertiary air annular jet, 3. cylindrical shape precombustion chamber, 4. tertiary air circular passage, 5. precombustion chamber refractory lining, 6. heat exchange scale, 7. tertiary air adjustable plate, 8. secondary air regulation plate, 9. tangential swirl blade, 10. primary air piping, 11. primary wind and powder entrances, 12. central tubes, 13. gas conduct pipes, 14. centre wind circular passages, 15. First air circular passages, 16. Secondary Air circular passages, 17. circulating flue gas air compartments, 18. Secondary Air axial swirlers, 19. high-temperature flame-proof rings, 20. circulating flue gas circular passages, 21. Secondary Air air compartments, 22. tertiary air air compartments.
Detailed description of the invention
Now the present invention is further explained in conjunction with the embodiments.
Embodiment 1
A kind of low NOx combustion apparatus from preheating and coal dust sectional combustion, comprise the cylindrical shape precombustion chamber 3 be connected on boiler wall with refractory lining, refracto 1, cylindrical shape precombustion chamber 3 inwall is provided with precombustion chamber refractory lining 5, primary air piping 10 coaxially sheathed outside central tube 12 and central tube 12 is provided with in the front end of cylindrical shape precombustion chamber, coaxially be provided with gas conduct pipe 13 in central tube 12 inside to be communicated with cylindrical shape precombustion chamber 3, space between central tube 12 and gas conduct pipe 13 forms centre wind circular passage 14, the import of primary air piping 10 is primary wind and powder entrance 11, passage between central tube 12 and primary air piping 10 is First air circular passage 15, the Secondary Air circular passage 16 in the outside of primary air piping 10 by primary air piping 10 and cylindrical shape precombustion chamber 3 front end around forming, tangential swirl blade 9 is provided with in Secondary Air circular passage 16, and be provided with secondary air regulation plate 8 at air inlet, tertiary air circular passage 4 is arranged with to cylindrical shape precombustion chamber 3 in the outside of cylindrical shape precombustion chamber 3 in Secondary Air circular passage 16, in tertiary air circular passage 4, the outside of cylindrical shape precombustion chamber 3, be provided with heat exchange scale 6, the port of export of tertiary air circular passage 4 is provided with tertiary air annular jet 2 and cylindrical shape precombustion chamber 3, boiler wall with refractory lining, refracto 1 is communicated with, tertiary air adjustable plate 7 is provided with at the air inlet of tertiary air circular passage 4.
By by the coal dust entering into cylindrical shape precombustion chamber 3 in First air circular passage 15, the gaseous fuel importing to cylindrical shape precombustion chamber 3 by Secondary Air circular passage 16 and imported in cylindrical shape precombustion chamber 3 by gas conduct pipe 13 carries out first time fuel-rich combustion in cylindrical shape precombustion chamber 3, coefficient of excess air controls in 0.4 ~ 0.75 scope, and flame temperature remains on 1000 ~ 1100 DEG C of levels; By the air after preheating in tertiary air circular passage 4, second time oxygen-enriched combusting is carried out with the unburnt pulverized coal flame of first time fuel-rich combustion in cylindrical shape precombustion chamber 3, coefficient of excess air controls in 1.2 ~ 1.35 scopes, flame temperature remain on 1200 ~ 1350 DEG C middle warm water put down.
Embodiment 2
A kind of low NOx combustion apparatus from preheating and coal dust sectional combustion, comprise the cylindrical shape precombustion chamber 3 be connected on boiler wall with refractory lining, refracto 1, cylindrical shape precombustion chamber 3 madial wall is provided with precombustion chamber refractory lining 5, the both sides of cylindrical shape precombustion chamber 3 front end add high-temperature flame-proof ring 19, primary air piping 10 coaxially sheathed outside central tube 12 and central tube 12 is provided with in the front end of cylindrical shape precombustion chamber 3, coaxially be provided with gas conduct pipe 13 in central tube 12 inside to be communicated with cylindrical shape precombustion chamber 3, space between central tube 12 and gas conduct pipe 13 forms centre wind circular passage 14, the import of primary air piping 10 is primary wind and powder entrance 11, passage between central tube 12 and primary air piping 10 is First air circular passage 15, the Secondary Air circular passage 16 in the outside of primary air piping 10 by primary air piping 10 and high-temperature flame-proof ring 19 around forming, the circulating flue gas circular passage 20 be provided with outside Secondary Air circular passage 16 by precombustion chamber refractory lining 5 and high-temperature flame-proof ring 19 around forming, in Secondary Air circular passage 16, air inlet is provided with secondary air regulation plate 8, and Secondary Air axial swirler is provided with in Secondary Air circular passage 16, tertiary air circular passage 4 is arranged with in the outside of cylindrical shape precombustion chamber 3, in tertiary air circular passage 4, the outside of cylindrical shape precombustion chamber 3, be provided with heat exchange scale 6, the port of export of tertiary air circular passage 4 is provided with tertiary air annular jet 2 and cylindrical shape precombustion chamber 3, boiler wall with refractory lining, refracto 1 is communicated with, tertiary air adjustable plate 7 is provided with at the air inlet of tertiary air circular passage 4.
By by the coal dust entering into cylindrical shape precombustion chamber 3 in First air circular passage 15, the combustion air of cylindrical shape precombustion chamber 3, the circulating flue gas being imported to cylindrical shape precombustion chamber 3 by centre wind circular passage 14 is imported to and the gaseous fuel that imported in cylindrical shape precombustion chamber 3 by gas conduct pipe 13 carries out first time fuel-rich combustion in cylindrical shape precombustion chamber 3 by Secondary Air circular passage 16, coefficient of excess air controls in 0.4 ~ 0.75 scope, and flame temperature remains on 1000 ~ 1100 DEG C of levels; By the air after preheating in tertiary air circular passage 4, second time oxygen-enriched combusting is carried out with the unburnt pulverized coal flame of first time fuel-rich combustion in cylindrical shape precombustion chamber 3, coefficient of excess air controls in 1.2 ~ 1.35 scopes, flame temperature remain on 1200 ~ 1350 DEG C middle warm water put down.

Claims (6)

1. the low NOx combustion apparatus from preheating and coal dust sectional combustion, comprise the precombustion chamber be connected on boiler wall with refractory lining, refracto, it is characterized in that: be provided with primary air piping coaxially sheathed outside central tube and central tube in the front end of precombustion chamber, passage between central tube and primary air piping is First air circular passage, Secondary Air circular passage is provided with outside primary air piping, outside precombustion chamber, be arranged with tertiary air circular passage, the port of export of tertiary air circular passage is provided with tertiary air annular jet and is communicated with precombustion chamber, boiler wall with refractory lining, refracto.
2., as claimed in claim 1 from the low NOx combustion apparatus of preheating and coal dust sectional combustion, it is characterized in that: be coaxially provided with gas conduct pipe in central tube inside and be communicated with precombustion chamber, the formation centre wind circular passage, space between central tube and gas conduct pipe.
3., as claimed in claim 2 from the low NOx combustion apparatus of preheating and coal dust sectional combustion, it is characterized in that: outside Secondary Air circular passage, be also provided with circulating flue gas circular passage.
4., as claimed in claim 1 from the low NOx combustion apparatus of preheating and coal dust sectional combustion, it is characterized in that: in tertiary air circular passage, the outside of precombustion chamber, be provided with heat exchange scale.
5. as the low NOx combustion apparatus from preheating and coal dust sectional combustion as described in arbitrary in claim 1 ~ 4, it is characterized in that: in the air inlet of Secondary Air circular passage and/or tertiary air circular passage, be provided with adjustable plate.
6., as claimed in claim 5 from the low NOx combustion apparatus of preheating and coal dust sectional combustion, it is characterized in that: in First air circular passage and/or Secondary Air circular passage, be provided with tangential swirl blade or axial swirler.
CN201420828333.9U 2014-12-24 2014-12-24 A kind of low NOx combustion apparatus from preheating and coal dust sectional combustion Active CN204420998U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104501145A (en) * 2014-12-24 2015-04-08 山西蓝天环保设备有限公司 Self-preheating and sectionalized pulverized coal combustion low-NOx combustion device and method
CN105972588A (en) * 2016-07-14 2016-09-28 西安交通大学 High temperature flue gas extracting pre-burning type low NOx burner
CN111442275A (en) * 2020-04-21 2020-07-24 武汉科技大学 High-speed burner with large speed difference and low nitrogen oxide

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104501145A (en) * 2014-12-24 2015-04-08 山西蓝天环保设备有限公司 Self-preheating and sectionalized pulverized coal combustion low-NOx combustion device and method
CN105972588A (en) * 2016-07-14 2016-09-28 西安交通大学 High temperature flue gas extracting pre-burning type low NOx burner
CN111442275A (en) * 2020-04-21 2020-07-24 武汉科技大学 High-speed burner with large speed difference and low nitrogen oxide
CN111442275B (en) * 2020-04-21 2022-04-26 武汉科技大学 High-speed burner with large speed difference and low nitrogen oxide

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Effective date of registration: 20161214

Address after: 100029 Beichen West Road, Chaoyang District, No. 19 to layer 69, unit 2008, 3, 20

Patentee after: Environmental Science Research Institute Co Ltd Beijing Zhongaotong

Address before: Bei Yi Jing Xiang Cao Jia Zhuang Cun 034016 Shanxi province Xinzhou Xinfu District North

Patentee before: Shanxi Lantian Environmental Protection Equipment Co.,Ltd.