CN107355776B - Combustion system, method and application of pulverized coal boiler with ultra-low NOx emission - Google Patents
Combustion system, method and application of pulverized coal boiler with ultra-low NOx emission Download PDFInfo
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- CN107355776B CN107355776B CN201710571854.9A CN201710571854A CN107355776B CN 107355776 B CN107355776 B CN 107355776B CN 201710571854 A CN201710571854 A CN 201710571854A CN 107355776 B CN107355776 B CN 107355776B
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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
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING 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
- F23L1/00—Passages or apertures for delivering primary air for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING 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
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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Abstract
The invention discloses a kind of Combustion System of Boiler Burning Fine of ultra-low NOx emission, including coal gasification apparatus (2), primary wind pipe (3), a wind snout (4), secondary air duct (5), overfire air port (6), level-one fire air nozzle (7) and second level fire air nozzle (8)；Wind snout (4), overfire air port (6), level-one fire air nozzle (7) and second level fire air nozzle (8) are successively layered arranged for interval on the water-cooling wall of boiler furnace (1)；The secondary air duct (5) connect with the overfire air port (6), level-one fire air nozzle (7) and second level fire air nozzle (8).The invention also discloses a kind of coal powder boiler combustion methods of ultra-low NOx emission.The invention also discloses the applications of a kind of Combustion System of Boiler Burning Fine of ultra-low NOx emission and method.Combustion system of the invention can realize 80mg/Nm3~120mg/Nm3Ultra-low NOx emission, directly reach the common exhaust standard of station boiler NOx.
Description
Technical field
The invention belongs to pulverized coal combustions, more particularly, to a kind of coal powder boiler combustion system of ultra-low NOx emission
System, method and application.
Background technique
Coal is still the main energy sources in China, accounts for about 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 generates a large amount 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 damage animals and plants directly affect growth, break
Bad ozone layer, and be also to cause one of greenhouse effects, acid rain and main matter of photochemical fog reaction.With social development
And technological progress, people increasingly pay attention to environmental protection, China proposes the discharged nitrous oxides of station boiler in recent years
Stringent limitation and perspective requirement, the large and medium-sized coal-burning boiler in power industry have generally carried out low-NO_x combustion technology and denitration
Transformation plays good effect to NOx emission is reduced.As NOx control standard is increasingly strict, there are many technologies with de-
Pernicious gas production quantity is removed or reduced, pernicious gas is largely reduced and is discharged into atmosphere, reduce the harm to environment.
It was found that there are three types of the NOx produced in process of coal combustion by the formation mechanism difference of NOx: 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 generates hydrocarbon etc. and N when burning2NOx is quickly generated, ratio pole is generated in coal-burning boiler
Few, mainly first two NOx is generated.Fuel type NOx accounts for about 70~90%, and thermal NO x accounts for about 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
Powder combustion process nitrogen oxides generated is mainly NO and NO2, wherein NO accounts for about 95% or more.
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 entire boiler, entire combustion process is made to tend to rationally, coal dust firing be effectively reduced
The production quantity of nitrogen oxides in the process.Burner hearth is set to form primary combustion zone, reducing zone and burning-out zone, as shown in Figure 1, Ith area Tu Zhong
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, generate
A large amount of reducibility gas CO, CH4、H2, HCN etc., reduction reaction occurs with NOx and generates N2, it is suppressed that NOx is generated；It is sent in burning-out zone
Enter remaining air quantity to realize after-flame and avoid the generation of thermal NO x.
The low-NO_x combustion technology of current existing large-scale power station pulverized-coal fired boiler, under normal circumstances, NOx generation are able to suppress
200mg/Nm3Left and right (180mg/Nm3~240mg/Nm3), Yao Shixian boiler 50mg/Nm3Ultra-low emission of NOx, also need to use
SCR tail flue gas denitration.Two-stage SCR selective reduction denitration need to be generally used, equipment input cost and operating cost are higher, and
And air preheater clog and the escaping of ammonia are easily caused after penetrating liquid ammonia in flue gas.Air preheater clog, shadow
Ring equipment safety operation；The ammonia of escape is discharged into atmosphere, will form new pollution.
After existing large-scale power station pulverized-coal fired boiler low-NO_x combustion technology transformation, since the combustion-supporting Secondary Air in main burning area substantially subtracts
It is few, in the top setting separation burnout degree far from primary zone, it is equivalent to combustion process of the coal dust in furnace and extends, easily cause to fly
Phenomena such as grey combustible increases, and furnace outlet exhaust gas temperature increases, and Higher temperature of Overheated Steam causes spray water flux to be significantly increased,
Influence boiler thermal efficiency and security performance.
Summary of the invention
Aiming at the above defects or improvement requirements of the 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 multi-staged air classification, it can not only realize the economical combustion of pulverized-coal fired boiler safety and stability but also can realize nitrogen oxides minimum discharge.
To achieve the goals above, according to one aspect of the present invention, a kind of pulverized-coal fired boiler combustion of ultra-low NOx emission is provided
Burning system, comprising: coal gasification apparatus, primary wind pipe, a wind snout, secondary air duct, overfire air port, level-one burnout degree
Spout and second level fire air nozzle；
Wherein, a wind snout, overfire air port, level-one fire air nozzle and second level fire air nozzle are successively layered
Arranged for interval is on the water-cooling wall of boiler furnace；
Described primary wind pipe is connect with a wind snout；
The secondary air duct is connect with the overfire air port, level-one fire air nozzle and second level fire air nozzle；
The coal gasification apparatus is set between the end and a wind snout of described primary wind pipe；
Wind snout is used for for spraying First air, the overfire air port into the burner hearth to the burner hearth
Interior injection Secondary Air, the level-one fire air nozzle is for spraying a burnout degree, the second level burnout degree into the burner hearth
Spout is for spraying secondary burnout degree into the burner hearth, to realize the ultra-low NOx emission burning of coal dust.
Further, the burner hearth forms coal powder ignition gasification zone, a shape between wind snout and overfire air port
It is formed at primary combustion reducing zone, between the overfire air port and the level-one fire air nozzle and restores zones of extensibility, described one
Level-one burning-out zone, shape between the second level fire air nozzle and burner hearth are formed between grade fire air nozzle and second level fire air nozzle
At second level burning-out zone.
Further, a wind snout enters the wind powder air-flow of burner hearth for small circle of contact arrangement, the overfire air port
General mood stream into burner hearth is big circle of contact arrangement.
Other side according to the invention provides 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, experience kindling, burning and gasification in coal powder ignition gasification zone I
Afterwards, a large amount of fuel gas generated based on CO；
(2) breeze airflow enters primary combustion reduced zone II in step (1), forms a large amount of reducibility gas, inhibits NOx
It generates；
(3) breeze airflow in step (2) enters reduction zones of extensibility III, and NOx is further reduced；
(4) breeze airflow in step (3) enters level-one burning-out zone IV, from level-one fire air nozzle infeed section after-flame
Wind, coal dust burn away under the conditions of oxygen debt, still generate reducing atmosphere, it is difficult to generate NOx；
(5) breeze airflow in step (4) enters second level burning-out zone V, then by second level fire air nozzle infeed section after-flame
Wind, flue-gas temperature is at 1100 DEG C hereinafter, thermal NO x is difficult to be formed, while fuel type NOx generation amount is few, meets power station
The common exhaust standard of boiler NOx.
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 level-one burning-out zone (IV) is 0.8~0.9.
Preferably, the excess air coefficient of the second level burning-out zone (V) is 1.1~1.25.
Further, reducibility gas described in step (2) is CO, CH4、H2, one of HCH or CnHm or a variety of.
Other side according to the invention, provide ultra-low NOx emission described in one kind Combustion System of Boiler Burning Fine and
The application of method is suitable for corner tangential firing pulverized-coal fired boiler, opposed firing formula combusting coal fines boiler or W type flame combustion coal
Powder boiler.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) Combustion System of Boiler Burning Fine of the invention can guarantee the combustion of coal dust stable ignition under the conditions of depth air classification
It burns, realizes 80mg/Nm3~120mg/Nm3Ultra-low NOx emission, directly reach the common exhaust standard of station boiler NOx, be not required to
The investment of tail portion denitrification apparatus.
(2) Combustion System of Boiler Burning Fine of the invention, for Special section, it is desirable that 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 investment 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, since the setting of coal dust gasification device is before entering burner hearth, substantially
The combustion process (path and time) for extending coal dust, advantageously reduces fly ash combustible material and furnace outlet gas temperature, avoids overheating
Temperature is higher to cause spray water flux to increase considerably.
Detailed description of the invention
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 that W flame boiler combustion zone structural facades schematic diagram is encircleed in the front and back of ultra-low NOx emission.
In all the appended drawings, same appended drawing reference indicates identical technical characteristic, specifically: 1- burner hearth, 2- coal gasification
It is device, 3- primary wind pipe, wind snout of 4-, 5- secondary air duct, 6- overfire air port, secondary in 601- turbulent burner
Bis- wind snout, 602- turbulent burner outer second air spout, fire air nozzle of 7-, 8- fire air nozzles.I-coal dust
Fiery gasification zone, II-primary combustion reducing zone, III-are at reduction zones of extensibility, IV-level-one burning-out zone, V- second level burning-out zone.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below that
Not constituting conflict between this can be combined with each other.
A kind of Combustion System of Boiler Burning Fine of ultra-low NOx emission, including coal gasification apparatus 2, primary wind pipe 3, First air
Spout 4, secondary air duct 5, overfire air port 6, level-one fire air nozzle 7 and second level fire air nozzle 8.Wherein, First air sprays
Mouth 4, overfire air port 6, level-one fire air nozzle 7 and second level fire air nozzle 8 are successively layered arranged for interval in boiler furnace 1
On water-cooling wall；Primary wind pipe 3 is connect with a wind snout 4；Secondary air duct 5 and the overfire air port 6, level-one burnout degree
Spout 7 and second level fire air nozzle 8 connect；Coal gasification apparatus 2 is set to the end and First air spray of described primary wind pipe 3
Between mouth 4；
For wind snout 4 for spraying First air into burner hearth 1, overfire air port 6 is secondary for spraying into burner hearth 1
Wind, level-one fire air nozzle 7 are used for for spraying a burnout degree, second level fire air nozzle 8 into burner hearth 1 to the burner hearth 1
The interior secondary burnout degree of injection, to realize the ultra-low NOx emission burning of coal dust.
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 grade fire air nozzle 7, forms one between level-one fire air nozzle 7 and second level fire air nozzle 8
Grade burning-out zone IV, forms second level burning-out zone V between second level fire air nozzle 8 and burner hearth 1.
Wind snout enters the wind powder air-flow of burner hearth for small circle of contact arrangement, and the general mood stream that overfire air port enters burner hearth is
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, experience kindling, burning and gasification in coal powder ignition gasification zone I
Afterwards, a large amount of fuel gas generated based on CO；
(2) breeze airflow enters primary combustion reduced zone II in step (1), forms a large amount of reducibility gas, inhibits NOx
It generates；
(3) breeze airflow in step (2) enters reduction zones of extensibility III, and NOx is further reduced；
(4) breeze airflow in step (3) enters level-one burning-out zone IV, from level-one fire air nozzle infeed section after-flame
Wind, coal dust burn away under the conditions of oxygen debt, still generate a certain amount of reducing atmosphere, it is difficult to generate NOx；
(5) breeze airflow in step (4) enters second level burning-out zone V, then by second level fire air nozzle infeed section after-flame
Wind, flue-gas temperature is at 1100 DEG C hereinafter, thermal NO x is difficult to be formed, while the fuel type NOx of coal dust is minimum, meets power station
The common exhaust standard of boiler NOx.
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 level-one burning-out zone (IV) is 0.8~0.9.
In one embodiment of the invention, the excess air coefficient of the second 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
It is one or more.
Combustion System of Boiler Burning Fine of the invention can guarantee the burning of coal dust stable ignition under the conditions of depth air classification,
Realization ultra-low NOx emission is 80mg/Nm3~120mg/Nm3, the common exhaust standard of station boiler NOx is directly reached, tail is not required to
The investment of portion's denitrification apparatus.Suitable for corner tangential firing pulverized-coal fired boiler, opposed firing formula combusting coal fines boiler or W type flame
Combusting coal fines boiler.
Embodiment 1
As shown in Figure 1, Figure 2, the end that every primary air piping is arranged in coal dust gasification device is entered to the position before burner hearth,
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 arrange.First air breeze airflow enters
After coal dust gasification device, experience kindling, burning and gasification, 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.
Primary combustion reduction area burner top a distance is provided with level-one burnout degree, at a distance of one section of level-one fire air nozzle top
Distance is provided with second level fire air nozzle.Area burner top to the area level-one fire air nozzle is restored from primary combustion
Domain is reduction zones of extensibility III；It is level-one burning-out zone IV from level-one fire air nozzle to the region second level fire air nozzle；From
Second level fire air nozzle to the region between furnace outlet be second 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 0.6~0.7, is depth anoxycausis state, forms a large amount of reducibility gas, NOx is inhibited to generate.Later, flame flow into
Enter to restore zones of extensibility III, NOx is further reduced.When flame flow enters level-one burning-out zone IV, sent from level-one fire air nozzle
Enter part burnout degree, make excess air coefficient 0.8~0.9, coal dust burns away under the conditions of oxygen debt, still generates a certain amount of
Reducing atmosphere, it is difficult to generate NOx.When flame flow enters second level burning-out zone V, then by second level fire air nozzle infeed section
Burnout degree makes excess air coefficient 1.1~1.25, and flue-gas temperature at this time is at 1100 DEG C hereinafter, thermal NO x is difficult to shape
At, at the same the fuel type NOx of coal dust reached it is minimum.
This states the boiler combustion technology mode of ultra-low NOx emission, and ultralow NOx may be implemented and be generated as 80mg/Nm3~
120mg/Nm3, the common exhaust standard of station boiler NOx is directly reached, the investment of tail portion denitrification apparatus is not required to.
Embodiment 2
As shown in Figure 3, Figure 4, it for the boiler of opposed firing formula turbulent burner arrangement, can also use this
The combustion technology mode that ultralow NOx is generated.Unlike tangentially-fired boiler, coal dust gasification device is arranged in 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.When First air breeze airflow enters the coal dust gasification dress of turbulent burner center
Set, be ignited, catch fire, burning, gasifying namely the inner hub location of turbulent burner be I region be 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 be mixed and burned, 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 maintaining the coefficient of excess air of primary combustion reducing zone is 0.6~0.7.At a distance of lower furnace portion master
It burns a distance above the top layer burner of reducing zone, arranges the level-one fire air nozzle of opposed firing formula；Exist again
A distance above level-one fire air nozzle arranges the second level fire air nozzle of opposed firing formula.It is restored from primary combustion
Area burner top is to restore zones of extensibility III to the region between level-one fire air nozzle；It is fired from level-one fire air nozzle to second level
Region to the greatest extent between wind snout is level-one burning-out zone IV；Region between from second level fire air nozzle to furnace outlet is second level combustion
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,
NOx is inhibited to generate.Later, flame flow enters reduction zones of extensibility III, and NOx is further reduced.When flame flow enters level-one
Burning-out zone IV makes excess air coefficient 0.8~0.9, coal dust is in oxygen debt item from level-one fire air nozzle infeed section burnout degree
It burns away under part, still generates a certain amount of reducing atmosphere, it is difficult to generate NOx.When flame flow enters second level burning-out zone V,
Again by second level fire air nozzle infeed section burnout degree, make excess air coefficient 1.1~1.25, flue-gas temperature at this time exists
1100 DEG C hereinafter, thermal NO x is difficult to be formed, while the fuel type NOx of coal dust reached it is minimum.
This states the boiler combustion technology mode of ultra-low NOx emission, and ultralow NOx may be implemented and be generated as 80mg/Nm3~
120mg/Nm3, the common exhaust standard of station boiler NOx is directly reached, the investment of tail portion denitrification apparatus is not required to.
Embodiment 3
As shown in figure 5, the combustion technology mode of ultra-low NOx emission is realized for front and back arch W flame boiler, first by coal dust
Gasification installation be arranged in front and back arch on First air burner position, when First air breeze airflow enter burner hearth before,
It catches fire, burn in coal dust gasification device, gasification, generating the largely flame of combustible gases based on CO, being sprayed into from double arch tops
Lower hearth further burns, and forms W type flame.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 sprays into suitable injection Secondary Air and combustion-supporting Secondary Air in lower hearth, maintains excess air coefficient 0.6~0.7.
In a distance at a distance of Shuan Gong throat top, the level-one fire air nozzle of opposite-flushing type is set on the front-back wall of upper furnace, then
Opposite-flushing type second level fire air nozzle is arranged in a distance on level-one fire air nozzle top.In this way, in Shuan Gong throat to level-one
The region of fire air nozzle is exactly region III, to restore zones of extensibility；In level-one fire air nozzle to the area of second level fire air nozzle
Domain is exactly region IV, is level-one burning-out zone；It is exactly region V in the region of second level fire air nozzle to furnace outlet, is fired for second 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 processed is generated.Later, flame flow enters reduction zones of extensibility III, and NOx is further reduced.When flame flow enters level-one combustion
Area IV makes excess air coefficient 0.8~0.9, coal dust is oxygen debt from level-one sofa fire air nozzle infeed section burnout degree to the greatest extent
Under the conditions of burn away, still generate a certain amount of reducing atmosphere, it is difficult to generate NOx.When flame flow enters second level burning-out zone,
Again by second level fire air nozzle infeed section burnout degree, make excess air coefficient 1.1~1.25, flue-gas temperature at this time exists
1100 DEG C hereinafter, thermal NO x is difficult to be formed, while the fuel type NOx of coal dust reached it is minimum.
This states the boiler combustion technology mode of ultra-low NOx emission, and ultralow NOx may be implemented and be generated as 80mg/Nm3~
120mg/Nm3, the common exhaust standard of station boiler NOx is directly reached, the investment of tail portion denitrification apparatus is not required to.
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, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of Combustion System of Boiler Burning Fine of ultra-low NOx emission characterized by comprising coal gasification apparatus (2), First air
Pipeline (3), a wind snout (4), secondary air duct (5), overfire air port (6), level-one fire air nozzle (7) and second level after-flame
Wind snout (8)；
Wherein, a wind snout (4), overfire air port (6), level-one fire air nozzle (7) and second level fire air nozzle (8)
Successively layering arranged for interval is on the water-cooling wall of boiler furnace (1)；
The primary wind pipe (3) is connected to a wind snout (4)；
The secondary air duct (5) and the overfire air port (6), level-one fire air nozzle (7) and second level fire air nozzle (8)
Connection；
The burner hearth (1) forms coal powder ignition gasification zone (I), is formed between a wind snout (4) and overfire air port (6)
Primary combustion reducing zone (II) forms reduction zones of extensibility between the overfire air port (6) and the level-one fire air nozzle (7)
(III), level-one burning-out zone (IV) is formed between the level-one fire air nozzle (7) and second level fire air nozzle (8), the second level
Region between fire air nozzle (8) and burner hearth (1) outlet forms second level burning-out zone (V)；
The coal gasification apparatus (2) is set between the end and a wind snout (4) of described primary wind pipe (3)；
Wind snout (4) is used for spraying primary wind and powder in the burner hearth (1), the overfire air port (6) be used for
Secondary Air is sprayed in the burner hearth (1), the level-one fire air nozzle (7) is used to spray an after-flame into the burner hearth (1)
Wind, the second level fire air nozzle (8) is used for the secondary burnout degree of injection into the burner hearth (1), to realize the ultralow of coal dust
NOx emission burning.
2. a kind of Combustion System of Boiler Burning Fine of ultra-low NOx emission according to claim 1, which is characterized in that described one
Secondary wind snout (4) enters the breeze airflow of burner hearth (1) for small circle of contact arrangement, and the overfire air port (6) enters the two of burner hearth (1)
Secondary general mood stream is big circle of contact arrangement.
3. a kind of coal powder boiler combustion method of ultra-low NOx emission, which is characterized in that using such as any one of claims 1 or 2 institute
The Combustion System of Boiler Burning Fine for the ultra-low NOx emission stated, specifically comprises the following steps:
(1) after breeze airflow enters coal dust gasification device, after coal powder ignition gasification zone (I) undergoes kindling, burning and gasification,
A large amount of fuel gas generated based on CO；
(2) breeze airflow enters primary combustion reduced zone (II) experience depth anoxycausis in step (1), forms a large amount of reduction
Property gas, inhibit NOx generate；
(3) breeze airflow in step (2) enters reduction zones of extensibility (III), and NOx is further restored；
(4) breeze airflow in step (3) enters level-one burning-out zone (IV), from level-one fire air nozzle infeed section burnout degree,
Coal dust burns away under the conditions of oxygen debt, still generates reducing atmosphere, it is difficult to generate NOx；
(5) breeze airflow in step (4) enters second level burning-out zone (V), then is sent into remaining burnout degree by second level fire air nozzle,
Flue-gas temperature is at 1100 DEG C hereinafter, thermal NO x is difficult to be formed, while the fuel type NOx that coal dust firing generates is few, meets
The common exhaust standard of station boiler NOx.
4. a kind of coal powder boiler combustion method of ultra-low NOx emission according to claim 3, which is characterized in that the coal
The excess air coefficient of powder kindling gasification zone (I) is 0.2~0.4.
5. a kind of coal powder boiler combustion method of ultra-low NOx emission according to claim 3, which is characterized in that the master
Burn reducing zone (II) excess air coefficient be 0.6~0.7.
6. a kind of coal powder boiler combustion method of ultra-low NOx emission according to claim 3, which is characterized in that described one
The excess air coefficient of grade burning-out zone (IV) is 0.8~0.9.
7. a kind of coal powder boiler combustion method of ultra-low NOx emission according to claim 3, which is characterized in that described two
The excess air coefficient of grade burning-out zone (V) is 1.1~1.25.
8. a kind of coal powder boiler combustion method of ultra-low NOx emission according to claim 3, which is characterized in that step (2)
Described in reducibility gas be CO, H2Or one of CnHm or a variety of.
9. in a kind of Combustion System of Boiler Burning Fine of ultra-low NOx emission as claimed in claim 1 or 2 or such as claim 3-8
The application of the coal powder boiler combustion method of described in any item ultra-low NOx emissions, which is characterized in that be suitable for corner tangential firing
Pulverized-coal fired boiler, opposed firing formula combusting coal fines boiler or W type flame combustion pulverized-coal fired boiler.
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| CN108036308B (en) * | 2017-11-22 | 2019-04-12 | 东方电气集团东方锅炉股份有限公司 | Reduce the air distribution method of boiler furnace outlet amount of nitrogen oxides and the boiler for coal dust firing |
| CN108443866A (en) * | 2018-03-22 | 2018-08-24 | 上海锅炉厂有限公司 | A kind of vortex burner matches the combustion of industrial boiler system of circle of contact burnout degree |
| CN109578994B (en) * | 2018-12-13 | 2020-03-31 | 西安交通大学 | A low NOx combustion system for flue gas recirculation and ultra-fine pulverized coal graded gasification |
| CN110242952A (en) * | 2019-05-30 | 2019-09-17 | 国电浙江北仑第一发电有限公司 | A kind of low cooling air quantity burner using composite material spout |
| CN110873327B (en) * | 2019-12-19 | 2024-06-07 | 上海交通大学 | An ultra-low NOx combustion device suitable for small pulverized coal boilers |
| CN110925747B (en) * | 2019-12-19 | 2024-06-07 | 上海交通大学 | Combustion device convenient for directly injecting coal water slurry into low-oxygen flame to reduce NOx |
| CN111911915B (en) * | 2020-07-29 | 2021-08-13 | 西安交通大学 | A kind of ammonia gas low nitrogen cyclone flameless combustion system and operation method thereof |
| CN112413570A (en) * | 2020-12-22 | 2021-02-26 | 南京工程学院 | Low-nitrogen burner for large and medium pulverized coal fired boiler under wide-load operation and use method |
| CN112833388B (en) * | 2021-01-19 | 2022-12-27 | 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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| FR2517025A1 (en) * | 1981-11-25 | 1983-05-27 | Fives Cail Babcock | INSTALLATION OF SOLID FUEL BOILER |
| CN1046346A (en) * | 1989-04-11 | 1990-10-24 | 北京科技大学 | Coal gasification burner and gasifying process |
| CN103216821B (en) * | 2013-04-27 | 2015-02-18 | 东方电气集团东方锅炉股份有限公司 | Multi-stage stratified combustion system and method for primary air and secondary air of boiler |
| CN104315502B (en) * | 2014-10-17 | 2016-06-08 | 西安交通大学 | A kind of biomass low temperature pre-burning low volatile low-grade coal low NOx combustion apparatus |
| CN205447700U (en) * | 2016-03-17 | 2016-08-10 | 西安交通大学 | Oxygendeficient burning boiler of brown coal semicoke |
| CN206130963U (en) * | 2016-10-08 | 2017-04-26 | 西安交通大学 | Low NOx combustor of high temperature flue gas backward flow pre -burning formula with SOFA |
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