CN107355776A - Combustion System of Boiler Burning Fine, method and the application of ultra-low NOx emission - Google Patents

Combustion System of Boiler Burning Fine, method and the application of ultra-low NOx emission Download PDF

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Publication number
CN107355776A
CN107355776A CN201710571854.9A CN201710571854A CN107355776A CN 107355776 A CN107355776 A CN 107355776A CN 201710571854 A CN201710571854 A CN 201710571854A CN 107355776 A CN107355776 A CN 107355776A
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China
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boiler
level
ultra
air nozzle
nox emission
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CN107355776B (en
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于洁
陈涛
郭永浩
孙路石
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Wuhan Hua Yu Energy Engineering Technology Co Ltd
Huazhong University of Science and Technology
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Wuhan Hua Yu Energy Engineering Technology Co Ltd
Huazhong University of Science and Technology
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00Combustion apparatus characterised by arrangements for air supply
    • F23C7/002Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L1/00Passages or apertures for delivering primary air for combustion 
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00Passages or apertures for delivering secondary air for completing combustion of fuel 

Abstract

The invention discloses a kind of Combustion System of Boiler Burning Fine of ultra-low NOx emission, including coal gasification apparatus (2), a wind pipe (3), a wind snout (4), secondary air duct (5), overfire air port (6), one-level fire air nozzle (7) and two level fire air nozzle (8);Wind snout (4), overfire air port (6), one-level fire air nozzle (7) and two level fire air nozzle (8) are layered arranged for interval on the water-cooling wall of boiler furnace (1) successively;The secondary air duct (5) is connected with the overfire air port (6), one-level fire air nozzle (7) and two level fire air nozzle (8).The invention also discloses a kind of coal powder boiler combustion method of ultra-low NOx emission.The invention also discloses the application of a kind of Combustion System of Boiler Burning Fine of ultra-low NOx emission and method.The combustion system of the present invention can realize 80mg/Nm3~120mg/Nm3Ultra-low NOx emission, directly reach station boiler NOx common exhaust standard.

Description

Combustion System of Boiler Burning Fine, method and the application of ultra-low NOx emission
Technical field
The invention belongs to pulverized coal combustion, more particularly, to a kind of coal powder boiler combustion system of ultra-low NOx emission System, method and application.
Background technology
Coal is still the main energy sources in China, accounts for 70% of energy resource supply or so.Large-scale power station pulverized-coal fired boiler is for I Main force's equipment of state's power industry, substantial amounts.It is a kind of that coal produces substantial amounts of nitrogen oxides in the combustion process of boiler Atmosphere pollution big and difficult to deal with is endangered, it not only stimulates the respiratory system of people, and infringement animals and plants directly affect growth, broken Bad ozone layer, and be also one of main matter for causing greenhouse effects, acid rain and photochemical fog reaction.With social development And technological progress, people increasingly pay attention to environmental protection, China proposes to the discharged nitrous oxides of station boiler in recent years Strict limitation and perspective requirement, the big-and-middle-sized coal-burning boiler in power industry have generally carried out low-NO_x combustion technology and denitration Transformation, good effect is served to reducing NOx emission.As NOx controls standard is increasingly strict, there are many technologies with de- Pernicious gas growing amount is removed or reduces, a large amount of pernicious gases that reduce are discharged into air, reduce the harm to environment.
It was found that because the NOx that NOx formation mechanism difference can generate has three kinds in process of coal combustion:1. fuel type NOx, the NOx that the organic nitrogen in fuel is directly oxidized to;2. thermal NO x, N in wind pushing air2At high temperature with O2Atom The NOx being combined into;3. momentary type NOx, hydrocarbon etc. and N are produced during burning2NOx is quickly generated, ratio pole is generated in coal-burning boiler It is few, mainly first two NOx generations.Fuel type NOx accounts for 70~90%, and thermal NO x accounts for 10~30%, Quick-type NOx Proportion < 5%, is typically ignored and disregards.NOx is to N2O、NO2、NO、N2O5And the general designation of the nitrogen oxides such as PAN.Coal The nitrogen oxides that powder combustion process is generated is mainly NO and NO2, wherein NO accounts for more than 95%.
The low-NO_x combustion technology transformation of current existing large-scale power station pulverized-coal fired boiler is the formation mechanism according to nitrogen oxides, Fuel staging, air classification are carried out in the space of whole boiler, whole combustion process is tended to be reasonable, effectively reduces coal dust firing During nitrogen oxides growing amount.Burner hearth is set to form primary combustion zone, reducing zone and burning-out zone, as shown in figure 1, the areas of Tu Zhong I Domain is primary combustion zone, and II region is reducing zone, and III region is burning-out zone.In main burning area and reducing zone anoxycausis, produce A large amount of reducibility gas CO, CH4、H2, HCN etc., reduction reaction generation N occurs with NOx2, it is suppressed that NOx is generated;Sent in burning-out zone Enter the generation that remaining air quantity realizes after-flame and avoids thermal NO x.
The low-NO_x combustion technology of current existing large-scale power station pulverized-coal fired boiler, generally, NOx generations can suppress 200mg/Nm3Left and right (180mg/Nm3~240mg/Nm3), to realize boiler 50mg/Nm3Ultra-low emission of NOx, also need to use SCR tail flue gas denitrations.Two-stage SCR selective reduction denitrations need to be typically used, equipment investment cost and operating cost are higher, and And easily cause air preheater clog and the escaping of ammonia after penetrating liquid ammonia in flue gas.Air preheater clog, shadow Ring equipment safety operation;The ammonia of escape is discharged into air, can form new pollution.
After existing large-scale power station pulverized-coal fired boiler low-NO_x combustion technology transformation, because the combustion-supporting Secondary Air in main burning area significantly subtracts It is few, separation burnout degree is set on the top away from primary zone, extends equivalent to combustion process of the coal dust in stove, easily causes to fly Phenomena such as grey combustible rise, furnace outlet exhaust gas temperature raise, and Higher temperature of Overheated Steam causes spray water flux to be significantly increased, Influence boiler thermal output and security performance.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the present invention provides a kind of pulverized-coal fired boiler of ultra-low NOx emission Combustion system, method and application, it is intended that improve fire behaviour of the First air wind powder air-flow under depth anaerobic condition, And realize that multi-staged air is classified, it can not only realize the economical combustion of pulverized-coal fired boiler safety and stability but also nitrogen oxides minimum discharge can be realized.
To achieve these goals, according to one aspect of the present invention, there is provided a kind of pulverized-coal fired boiler combustion of ultra-low NOx emission Burning system, including:Coal gasification apparatus, a wind pipe, a wind snout, secondary air duct, overfire air port, one-level burnout degree Spout and two level fire air nozzle;
Wherein, a wind snout, overfire air port, one-level fire air nozzle and the two level fire air nozzle are layered successively Arranged for interval is on the water-cooling wall of boiler furnace;
The a wind pipe is connected with a wind snout;
The secondary air duct is connected with the overfire air port, one-level fire air nozzle and two level fire air nozzle;
The coal gasification apparatus is between the end of a wind pipe and a wind snout;
Wind snout is used to spray First air into the burner hearth, and the overfire air port is used for the burner hearth Interior injection Secondary Air, the one-level fire air nozzle are used to spray a burnout degree, the two level burnout degree into the burner hearth Spout is used to spray secondary burnout degree into the burner hearth, so as to realize that the ultra-low NOx emission of coal dust burns.
Further, the burner hearth forms coal powder ignition gasification zone, a shape between wind snout and overfire air port Formed into primary combustion reducing zone, between the overfire air port and the one-level fire air nozzle and reduce zones of extensibility, described one One-level burning-out zone, shape between the two level fire air nozzle and burner hearth are formed between level fire air nozzle and two level fire air nozzle Into two level burning-out zone.
Further, the wind powder air-flow that a wind snout enters burner hearth is small circle of contact arrangement, the overfire air port General mood stream into burner hearth is arranged for the big circle of contact.
According to another aspect of the present invention, there is provided a kind of coal powder boiler combustion method of ultra-low NOx emission, using described Ultra-low NOx emission Combustion System of Boiler Burning Fine, specifically comprise the following steps:
(1) after breeze airflow enters coal dust gasification device, in coal powder ignition gasification zone I, experience is caught fire, burns and gasified Afterwards, the fuel gas based on CO is largely generated;
(2) breeze airflow enters primary combustion reduced zone II in step (1), forms a large amount of reducibility gas, suppresses NOx Generation;
(3) breeze airflow in step (2) enters reduction zones of extensibility III, and NOx is further reduced;
(4) breeze airflow in step (3) enters one-level burning-out zone IV, from one-level fire air nozzle infeed section after-flame Wind, coal dust burn away under the conditions of oxygen debt, still produce reducing atmosphere, it is difficult to generate NOx;
(5) breeze airflow in step (4) enters two level burning-out zone V, then by two level fire air nozzle infeed section after-flame Wind, below 1100 DEG C, thermal NO x is difficult to be formed flue-gas temperature, while fuel type NOx generation amount is few, meets power station Boiler NOx common exhaust standard.
Preferably, the excess air coefficient of the coal powder ignition gasification zone (I) is 0.2~0.4.
Preferably, the excess air coefficient of the primary combustion reducing zone (II) is 0.6~0.7.
Preferably, the excess air coefficient of the one-level burning-out zone (IV) is 0.8~0.9.
Preferably, the excess air coefficient of the two level burning-out zone (V) is 1.1~1.25.
Further, reducibility gas described in step (2) is CO, CH4、H2, one or more in HCH or CnHm.
According to another aspect of the present invention, there is provided a kind of Combustion System of Boiler Burning Fine of described ultra-low NOx emission and The application of method, suitable for corner tangential firing pulverized-coal fired boiler, opposed firing formula combusting coal fines boiler or W type flame combustion coals Powder boiler.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show Beneficial effect:
(1) Combustion System of Boiler Burning Fine of the invention, it can ensure that coal dust stable ignition fires under the conditions of depth air classification Burn, realize 80mg/Nm3~120mg/Nm3Ultra-low NOx emission, directly reach station boiler NOx common exhaust standard, be not required to The input of afterbody denitrification apparatus.
(2) Combustion System of Boiler Burning Fine of the invention, for Special section, it is desirable to realize 80mg/Nm3~120mg/Nm3's Ultra-low NOx emission, it is only necessary to put into a small amount of SCR denitration devices in boiler tail, ammonia input and the escaping of ammonia, Ke Yiji is greatly reduced It is big to reduce equipment investment and operating cost.
(3) coal powder boiler combustion method of the invention, because coal dust gasification device is arranged on into before burner hearth, substantially The combustion process (path and time) of coal dust is extended, fly ash combustible material and furnace outlet gas temperature is advantageously reduced, avoids overheating Temperature is higher to cause spray water flux to increase considerably.
Brief description of the drawings
Fig. 1 is the boiler tangential firing process area structural facades schematic diagram of ultra-low NOx emission;
Fig. 2 is tangential firing pulverized-coal fired boiler flame structural plan schematic diagram;
Fig. 3 is the opposed firing boiler combustion zone structural facades schematic diagram of ultra-low NOx emission;
Fig. 4 is Opposite Firing Boiler flame structure floor map;
Fig. 5 is the front and rear arch W flame boiler combustion zone structural facades schematic diagram of ultra-low NOx emission.
In all of the figs, same reference represents identical technical characteristic, is specially:1- burner hearths, 2- coal gasifications It is device, 3- a wind pipes, wind snout of 4-, 5- secondary air ducts, 6- overfire air ports, secondary in 601- turbulent burners Bis- wind snout, 602- turbulent burner outer second airs spout, fire air nozzle of 7-, 8- fire air nozzles.I-coal dust Fiery gasification zone, II-primary combustion reducing zone, III-into reduction zones of extensibility, IV-one-level burning-out zone, V- two level burning-out zones.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not For limiting the present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below that Conflict can is not formed between this to be mutually combined.
A kind of Combustion System of Boiler Burning Fine of ultra-low NOx emission, including coal gasification apparatus 2, a wind pipe 3, First air Spout 4, secondary air duct 5, overfire air port 6, one-level fire air nozzle 7 and two level fire air nozzle 8.Wherein, First air sprays Mouth 4, overfire air port 6, one-level fire air nozzle 7 and two level fire air nozzle 8 are layered arranged for interval in boiler furnace 1 successively On water-cooling wall;A wind pipe 3 is connected with a wind snout 4;Secondary air duct 5 and the overfire air port 6, one-level burnout degree Spout 7 and two level fire air nozzle 8 connect;Coal gasification apparatus 2 is located at the end of a wind pipe 3 and First air spray Between mouth 4;
Wind snout 4 is used to spray First air into burner hearth 1, and overfire air port 6 is secondary for being sprayed into burner hearth 1 Wind, one-level fire air nozzle 7 are used to spray a burnout degree into burner hearth 1, and two level fire air nozzle 8 is used for the burner hearth 1 The interior secondary burnout degree of injection, so as to realize that the ultra-low NOx emission of coal dust burns.
Primary combustion reducing zone II, overfire air port 6 and described one are formed between wind snout 4 and overfire air port 6 Reduction zones of extensibility III is formed between level fire air nozzle 7, one is formed between one-level fire air nozzle 7 and two level fire air nozzle 8 Level burning-out zone IV, forms two level burning-out zone V between two level fire air nozzle 8 and burner hearth 1.
The wind powder air-flow that wind snout enters burner hearth arranges that the general mood stream that overfire air port enters burner hearth is for the small circle of contact Big circle of contact arrangement.
In an embodiment of the invention, a kind of coal powder boiler combustion method of ultra-low NOx emission, using above-mentioned ultralow The Combustion System of Boiler Burning Fine of NOx emission, specifically comprises the following steps:
(1) after breeze airflow enters coal dust gasification device, in coal powder ignition gasification zone I, experience is caught fire, burns and gasified Afterwards, the fuel gas based on CO is largely generated;
(2) breeze airflow enters primary combustion reduced zone II in step (1), forms a large amount of reducibility gas, suppresses NOx Generation;
(3) breeze airflow in step (2) enters reduction zones of extensibility III, and NOx is further reduced;
(4) breeze airflow in step (3) enters one-level burning-out zone IV, from one-level fire air nozzle infeed section after-flame Wind, coal dust burn away under the conditions of oxygen debt, still produce a certain amount of reducing atmosphere, it is difficult to generate NOx;
(5) breeze airflow in step (4) enters two level burning-out zone V, then by two level fire air nozzle infeed section after-flame Wind, below 1100 DEG C, thermal NO x is difficult to be formed flue-gas temperature, while the fuel type NOx of coal dust is minimum, meets power station Boiler NOx common exhaust standard.
In one embodiment of the invention, the excess air coefficient of the coal powder ignition gasification zone (I) is 0.2~0.4.
In one embodiment of the invention, the excess air coefficient of the primary combustion reducing zone (II) be 0.6~ 0.7。
In one embodiment of the invention, the excess air coefficient of the one-level burning-out zone (IV) is 0.8~0.9.
In one embodiment of the invention, the excess air coefficient of the two level burning-out zone (V) is 1.1~1.25.
In one embodiment of the invention, reducibility gas described in step (2) is CO, CH4、H2, in HCH or CnHm One or more.
The Combustion System of Boiler Burning Fine of the present invention, it can ensure that coal dust stable ignition burns under the conditions of depth air classification, It is 80mg/Nm to realize ultra-low NOx emission3~120mg/Nm3, station boiler NOx common exhaust standard is directly reached, is not required to tail The input of portion's denitrification apparatus.Suitable for corner tangential firing pulverized-coal fired boiler, opposed firing formula combusting coal fines boiler or W type flames Combusting coal fines boiler.
Embodiment 1
As shown in Figure 1, Figure 2, by coal dust gasification device be arranged on every primary air piping end enter burner hearth before position, In burner hearth, coal dust gasification device primary air nozzle and overfiren air port, hierarchically dividing arrangement.Enter burner hearth from coal dust gasification device spout Primary wind and powder air-flow be the smaller circle of contact arrangement, overfire air port air-flow be the larger circle of contact arrangement.First air breeze airflow enters After coal dust gasification device, experience is caught fire, burns and gasified, and forming region is coal powder ignition gasification zone I, due to excess air system Number is only 0.2~0.4, can largely generate the fuel gas based on CO, subsequently enter the primary combustion reducing zone of lower furnace portion Domain II.In primary combustion reducing zone, due to the set-up mode of the bellows chamber powder of Secondary Air, Boiler Furnace slagging and high temperature corrosion are prevented. On primary combustion reduction area burner top one, segment distance is provided with one-level burnout degree, at a distance of one section of one-level fire air nozzle top Distance, it is provided with two level fire air nozzle.Area burner top to the area one-level fire air nozzle is reduced from primary combustion Domain is reduction zones of extensibility III;It is one-level burning-out zone IV from one-level fire air nozzle to the region two level fire air nozzle;From Two level fire air nozzle to the region between furnace outlet be two level burning-out zone V.
The gentle stream of flame after coal dust gasification enters the primary combustion reduced zone II of lower furnace portion, excess air coefficient It is depth anoxycausis state for 0.6~0.7, forms a large amount of reducibility gas, suppresses NOx generations.Afterwards, flame gas flows into Enter to reduce zones of extensibility III, NOx is further reduced.When flame flow enters one-level burning-out zone IV, sent from one-level fire air nozzle Enter part burnout degree, it is 0.8~0.9 to make excess air coefficient, and coal dust burns away under the conditions of oxygen debt, still produces a certain amount of Reducing atmosphere, it is difficult to generate NOx.When flame flow enters two level burning-out zone V, then by two level fire air nozzle infeed section Burnout degree, it is 1.1~1.25 to make excess air coefficient, and for flue-gas temperature now below 1100 DEG C, thermal NO x is difficult to shape Into, while the fuel type NOx of coal dust is up to minimum.
This states the boiler combustion technology mode of ultra-low NOx emission, it is possible to achieve ultralow NOx is generated as 80mg/Nm3~ 120mg/Nm3, station boiler NOx common exhaust standard is directly reached, is not required to the input of afterbody denitrification apparatus.
Embodiment 2
As shown in Figure 3, Figure 4, for the boiler of opposed firing formula turbulent burner arrangement, can also use this The combustion technology mode of ultralow NOx generations.Unlike tangentially-fired boiler, coal dust gasification device is arranged on eddy flow The center of burner, turbulent burner maintain inner second air and outer second air.If figure, 6 is secondary in turbulent burner Wind, 7 be turbulent burner outer second air.The coal dust gasification for entering turbulent burner center when First air breeze airflow fills Put, be ignited, catch fire, burn, gasify, namely the inner hub location of turbulent burner is that I region is coal powder ignition gasification zone. In this region, excess air coefficient is 0.2~0.4, the fuel gas based on CO can be largely generated, from turbulent burner center Spray into burner hearth.Meanwhile the inner second air and outer second air of turbulent burner select respectively it is different be mixed into a little and be mixed into distance, and Center First air flame flow mixed combustion, into the primary combustion reduced zone II of lower furnace portion, turbulent burner it is inside and outside Secondary air flow can not be excessive, and the coefficient of excess air for maintaining primary combustion reducing zone is 0.6~0.7.At a distance of lower furnace portion master Burn a segment distance above the superiors burner of reducing zone, arranges the one-level fire air nozzle of opposed firing formula;Exist again A segment distance above one-level fire air nozzle, arrange the two level fire air nozzle of opposed firing formula.Reduced from primary combustion Area burner top is to reduce zones of extensibility III to the region between one-level fire air nozzle;Fired from one-level fire air nozzle to two level Region to the greatest extent between wind snout is one-level burning-out zone IV;Fired for two level in region between from two level fire air nozzle to furnace outlet Area V to the greatest extent.
In the primary combustion reduced zone II of lower furnace portion, it is depth anoxycausis state, forms a large amount of reducibility gas, Suppress NOx generations.Afterwards, flame flow enters reduction zones of extensibility III, and NOx is further reduced.When flame flow enters one-level Burning-out zone IV, from one-level fire air nozzle infeed section burnout degree, it is 0.8~0.9 to make excess air coefficient, and coal dust is in oxygen debt bar Burnt away under part, still produce a certain amount of reducing atmosphere, it is difficult to generate NOx.When flame flow enters two level burning-out zone V, Again by two level fire air nozzle infeed section burnout degree, it is 1.1~1.25 to make excess air coefficient, and flue-gas temperature now exists Less than 1100 DEG C, thermal NO x is difficult to be formed, while the fuel type NOx of coal dust is up to minimum.
This states the boiler combustion technology mode of ultra-low NOx emission, it is possible to achieve ultralow NOx is generated as 80mg/Nm3~ 120mg/Nm3, station boiler NOx common exhaust standard is directly reached, is not required to the input of afterbody denitrification apparatus.
Embodiment 3
As shown in figure 5, the combustion technology mode of ultra-low NOx emission is realized for front and rear arch W flame boiler, first by coal dust Gasification installation is arranged on the First air burner position on front and rear arch, when First air breeze airflow is before burner hearth is entered, Catch fire, burn, gasify in coal dust gasification device, generate the largely flame of combustible gases based on CO, sprayed into from double arch tops Lower hearth, further burning, forms W type flames.In the combustion process of coal dust gasification device, excess air coefficient be 0.2~ 0.4.Coal dust gasification device on arch is exactly that I region is coal powder ignition gasification zone, and the lower hearth under encircleing is exactly that region II is main Burning reducing zone, appropriate injection Secondary Air and combustion-supporting Secondary Air are sprayed into lower hearth, maintains excess air coefficient 0.6~0.7. A segment distance on Shuan Gong throats top apart, the one-level fire air nozzle of opposite-flushing type is set on the front-back wall of upper furnace, then A segment distance on one-level fire air nozzle top sets opposite-flushing type two level fire air nozzle.So, in Shuan Gong throats to one-level The region of fire air nozzle is exactly region III, to reduce zones of extensibility;In one-level fire air nozzle to the area of two level fire air nozzle Domain is exactly region IV, is one-level burning-out zone;It is exactly region V in the region of two level fire air nozzle to furnace outlet, is fired for two level Area to the greatest extent.
In the primary combustion reduced zone II of lower hearth, it is depth anoxycausis state, forms a large amount of reducibility gas, presses down NOx generations processed.Afterwards, flame flow enters reduction zones of extensibility III, and NOx is further reduced.When flame flow fires into one-level Area IV to the greatest extent, from one-level sofa fire air nozzle infeed section burnout degrees, it is 0.8~0.9 to make excess air coefficient, and coal dust is oxygen debt Under the conditions of burn away, still produce a certain amount of reducing atmosphere, it is difficult to generate NOx.When flame flow enters two level burning-out zone, Again by two level fire air nozzle infeed section burnout degree, it is 1.1~1.25 to make excess air coefficient, and flue-gas temperature now exists Less than 1100 DEG C, thermal NO x is difficult to be formed, while the fuel type NOx of coal dust is up to minimum.
This states the boiler combustion technology mode of ultra-low NOx emission, it is possible to achieve ultralow NOx is generated as 80mg/Nm3~ 120mg/Nm3, station boiler NOx common exhaust standard is directly reached, is not required to the input of afterbody denitrification apparatus.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included Within protection scope of the present invention.

Claims (10)

  1. A kind of 1. Combustion System of Boiler Burning Fine of ultra-low NOx emission, it is characterised in that including:Coal gasification apparatus (2), First air Pipeline (3), a wind snout (4), secondary air duct (5), overfire air port (6), one-level fire air nozzle (7) and two level after-flame Wind snout (8);
    Wherein, a wind snout (4), overfire air port (6), one-level fire air nozzle (7) and two level fire air nozzle (8) Arranged for interval is layered successively on the water-cooling wall of boiler furnace (1);
    The a wind pipe (3) is connected with a wind snout (4);
    The secondary air duct (5) and the overfire air port (6), one-level fire air nozzle (7) and two level fire air nozzle (8) Connection;
    The coal gasification apparatus (2) is between the end of a wind pipe (3) and a wind snout (4);
    Wind snout (4) is used for injection primary wind and powder in the burner hearth (1), the overfire air port (6) be used for Injection Secondary Air in the burner hearth (1), the one-level fire air nozzle (7) are used for after-flame of injection into the burner hearth (1) Wind, the two level fire air nozzle (8) is used for the secondary burnout degree of injection into the burner hearth (1), so as to realize the ultralow of coal dust NOx emission is burnt.
  2. A kind of 2. Combustion System of Boiler Burning Fine of ultra-low NOx emission according to claim 1, it is characterised in that the stove Thorax (1) forms coal powder ignition gasification zone (I), and primary combustion is formed also between a wind snout (4) and overfire air port (6) Former area (II), reduction zones of extensibility (III) is formed between the overfire air port (6) and the one-level fire air nozzle (7), it is described One-level burning-out zone (IV), the two level fire air nozzle are formed between one-level fire air nozzle (7) and two level fire air nozzle (8) (8) two level burning-out zone (V) is formed between burner hearth (1).
  3. 3. the Combustion System of Boiler Burning Fine of a kind of ultra-low NOx emission according to claim 1, it is characterised in that described one The breeze airflow that secondary wind snout (4) enters burner hearth (1) arranges that the overfire air port (6) enters the two of burner hearth (1) for the small circle of contact Secondary general mood stream is arranged for the big circle of contact.
  4. 4. a kind of coal powder boiler combustion method of ultra-low NOx emission, it is characterised in that using such as any one of claim 1-3 The Combustion System of Boiler Burning Fine of described ultra-low NOx emission, specifically comprises the following steps:
    (1) after breeze airflow enters coal dust gasification device, after in coal powder ignition gasification zone I, experience is caught fire, burns and gasified, greatly Fuel gas of the amount generation based on CO;
    (2) breeze airflow enters the experience depth anoxycausis of primary combustion reduced zone II in step (1), forms a large amount of reproducibilities Gas, suppress NOx generations;
    (3) breeze airflow in step (2) enters reduction zones of extensibility III, and NOx is further reduced;
    (4) breeze airflow in step (3) enters one-level burning-out zone IV, from one-level fire air nozzle infeed section burnout degree, coal Powder burns away under the conditions of oxygen debt, still produces reducing atmosphere, it is difficult to generates NOx;
    (5) breeze airflow in step (4) enters two level burning-out zone V, then is sent into remaining burnout degree by two level fire air nozzle, Below 1100 DEG C, thermal NO x is difficult to be formed flue-gas temperature, while the fuel type NOx of coal dust firing generation is few, meets Station boiler NOx common exhaust standard.
  5. A kind of 5. coal powder boiler combustion method of ultra-low NOx emission according to claim 4, it is characterised in that the coal Powder catch fire gasification zone (I) excess air coefficient be 0.2~0.4.
  6. 6. the coal powder boiler combustion method of a kind of ultra-low NOx emission according to claim 4 or 5, it is characterised in that described The excess air coefficient of primary combustion reducing zone (II) is 0.6~0.7.
  7. 7. a kind of coal powder boiler combustion method of ultra-low NOx emission according to any one of claim 4-6, its feature exist In the excess air coefficient of the one-level burning-out zone (IV) is 0.8~0.9.
  8. 8. a kind of coal powder boiler combustion method of ultra-low NOx emission according to any one of claim 4-7, its feature exist In the excess air coefficient of the two level burning-out zone (V) is 1.1~1.25.
  9. 9. a kind of coal powder boiler combustion method of ultra-low NOx emission according to any one of claim 4-8, its feature exist In reducibility gas described in step (2) is CO, CH4、H2, one or more in HCH or CnHm.
  10. 10. a kind of Combustion System of Boiler Burning Fine of ultra-low NOx emission as claimed in any one of claims 1-9 wherein and answering for method With, it is characterised in that fired suitable for corner tangential firing pulverized-coal fired boiler, opposed firing formula combusting coal fines boiler or W types flame Firing coal dust boiler.
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CN112833388A (en) * 2021-01-19 2021-05-25 北京巴布科克·威尔科克斯有限公司 Ultralow NOx combustion system of opposed firing boiler
CN113864766A (en) * 2021-10-29 2021-12-31 山东建筑大学 NO is arranged to U typeXUltra-low discharge pulverized coal boiler

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CN112833388A (en) * 2021-01-19 2021-05-25 北京巴布科克·威尔科克斯有限公司 Ultralow NOx combustion system of opposed firing boiler
CN113864766A (en) * 2021-10-29 2021-12-31 山东建筑大学 NO is arranged to U typeXUltra-low discharge pulverized coal boiler

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