CN106247321B - A kind of W flame boiler for deeply denitration combustion method - Google Patents
A kind of W flame boiler for deeply denitration combustion method Download PDFInfo
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- CN106247321B CN106247321B CN201610607829.7A CN201610607829A CN106247321B CN 106247321 B CN106247321 B CN 106247321B CN 201610607829 A CN201610607829 A CN 201610607829A CN 106247321 B CN106247321 B CN 106247321B
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- inhibitor agent
- reduction inhibitor
- spout
- reduction
- deeply
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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
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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
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/003—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for pulverulent fuel
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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
- F23C2202/00—Fluegas recirculation
- F23C2202/40—Inducing local whirls around flame
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses a kind of W flame boiler for deeply denitration combustion methods, First air in the wind snout that fire coal is passed through several main burners is sent into hearth combustion, it is passed through the lower Secondary Air of arch by overfire air port under the arch on front-back wall, it is passed through lack of gas wind by lack of gas wind snout, it is passed through one layer or more of burnout degree in burning-out zone, the wherein excess air coefficient in primary zone ranging from 0.7~1.05, fire coal carry out low oxygen combustion；The excess air coefficient of burning-out zone is 1.05~1.3, carries out oxygen-enriched combusting；Reduction wind is also sprayed by the reduction wind snout between main burner and fire air nozzle on furnace wall, the excess air coefficient of reduction wind is 0.6~0.85；The amino reduction inhibitor agent that one layer or more is sprayed into top layer's burnout degree burner hearth below, the nitrogen oxides in burner hearth under hot environment in reduction flue gas.The present invention can not only significantly reduce the discharged nitrous oxides value of furnace outlet, realize minimum discharge, and stringent temperature window and catalyst are not needed, significantly reduce denitration cost, efficiency of combustion also can guarantee, remarkable in economical benefits, and prevent water-cooling wall in stove from high temperature corrosion occur, there is wide applicability.
Description
Technical field
The present invention relates to a kind of combustion methods for W flame boiler for deeply denitration.
Background technology
Coal can discharge nitrogen oxides in combustion（NOx）Pollutant, these pollutants can cause photochemical fog dirty
Dye can cause serious harm to human respiratory system and animals and plants existence.China is newest《Thermal power plant's atmosphere pollution
Discharge standard》（GB 13223-2011）Regulation, from 1 day January in 2015, whole nitrogen oxides from coal-fired boiler（With NO2Meter）Row
It is 100mg/Nm to put limit value3（Using W type flame hearths, existing recirculating fluidized bed thermal power generation boiler and 2003 12
The limit values such as the thermal power generation boiler being constructed and put into operation before the moon 31 are 200 mg/Nm3）.W flame boiler is a kind of for low volatile
Coal, if meager coal, anthracite stablize the specific type of furnace of burning, burner hearth front-back wall top is equipped with more than one burnout degree spray
It is equipped with several main burners on mouth, its two chimney arch, its burner hearth front-back wall lower part is equipped with Secondary Air under more than one arch and sprays
Mouthful, a wind snout and overfire air port are equipped in each main burner, burner hearth front-back wall is equipped with lack of gas wind snout, lack of gas wind
Spout is set to above or below chimney arch, and burner hearth is divided into primary zone, reducing zone and burning-out zone；When burning, main burner sprays downwards
Coal-fired, burning is penetrated, encircles lower overfire air port horizontal-jet, forms W-shaped flame, lack of gas wind snout sprays into a small amount of fire coal, is convenient for
Coal-fired conveying and raising fire box temperature；More fuel type NOx can be generated in W flame boiler combustion process, further, since W
Flame boiler is designed for unburnable coal, and combustion temperature in hearth is high, therefore also will produce more thermal NO x, considers
Two kinds of factors, W flame boiler are much higher compared to the NOx emission concentration value of other type of furnaces.
The denitration technology for being currently employed for W flame boiler is mainly Researched of Air Staging Combustion Burning Pulverized Coal and tail portion selective catalytic reduction
（SCR）Technology.
W flame boiler catches fire steady combustion and after-flame is advantage that it has, but air classification based on the low-volatite coal that burns
Degree is directly related with after-flame.Air classification degree improves, and can significantly affect the after-flame degree of low-volatite coal, therefore, in W fire
In flame boiler, it cannot depend merely on and improve air classification degree to reduce the discharge of NOx, it is necessary to take into account efficiency of combustion, control flying dust
Combustible.In addition, using air staged combustion technology merely, NOx reduction efficiency is only 30%~70% or so, for low volatile
Coal is intended to lower limit.And the NOx raw emissions of the meager coal that burns, anthracitic W flame boiler are high（Usually in 1000 mg/m3With
On）, simple air classification be difficult by the emission control of NOx to meet country discharge standard, and with classification degree increase,
Fuel economy can reduce, and obvious negative effect is brought to the economy of fuel combustion, meanwhile, classification degree increases
Significant negative effect is also brought to the safe and reliable operation of water-cooling wall in the stove under strong reducing property atmosphere.
Air classification cannot be relied solely on to control the level of NOx emission of W flame boiler, domestic power plant is generally using selection
Property catalytic reduction technique（SCR）Carry out further depth denitration.This technology sprays into ammonia agent reducing agent in back-end ductwork, is being catalyzed
The nitrogen oxides in flue gas is restored under the action of agent, the temperature of running environment needs to control at 300 DEG C~400 DEG C.But this skill
There are also noticeable places for art, and if flue-gas temperature is excessively high, the ammonia sprayed into flue gas can be oxidized to NOx, ammonia amount instead
Control it is improper can also cause the escaping of ammonia, and since the NOx original concentrations of the SCR device entrance after air classification are still very high, NOx
Reduction reaction process need to put into catalyst that is more or faster consuming, therefore operating cost is higher.
In another engineering frequently with gas denitrifying technology be NOx reduction techniques under the conditions of higher flue-gas temperature,
It is referred to as selective non-catalytic reduction technology（SNCR）.It is to put into ammonia agent also close to furnace outlet high-temperature region after burnout degree
Former nitrogen oxides.Since conversion zone temperature is high, catalyst is not needed, operating cost is reduced.But this combustion technology is suitable
Flue-gas temperature Process window is relatively narrow, between 800 DEG C~1100 DEG C.In low- load conditions, the oxygen concentration of furnace outlet
Higher, ammonia is more easy to be oxidized to nitrogen oxides.If fuel sulfur-bearing is higher, NH3It can also be with SO3Reaction generates ammonium salt, at low temperature
It can slagging corrosion.And because being arranged in after burnout degree, if penetrating ammonia amount is excessive, the escaping of ammonia is will also result in, therefore to pot
The working condition requirement of stove is higher, and applicable is limited in scope.
Invention content
The purpose of the present invention is the above-mentioned deficiencies for the prior art, provide a kind of W flame boiler for deeply denitration burning side
Method, it can not only significantly reduce the discharged nitrous oxides value of furnace outlet, realize minimum discharge, and do not need stringent temperature window
Mouth and catalyst, significantly reduce denitration cost, efficiency of combustion also can guarantee, remarkable in economical benefits, and prevent water-cooling wall in stove
There is high temperature corrosion, there is wide applicability.
In order to achieve the above object, a kind of W flame boiler for deeply denitration combustion method of the invention passes through fire coal front and back
First air on wall chimney arch in a wind snout of several main burners is sent into hearth combustion, and passes through the two of several main burners
Secondary wind snout is passed through Secondary Air, the lower Secondary Air of arch is passed through by overfire air port under the arch on front-back wall, by front-back wall
Lack of gas wind snout is passed through lack of gas wind, and one layer or more of burnout degree is passed through by fire air nozzle in burning-out zone, it is characterised in that：Its
The excess air coefficient in middle primary zone ranging from 0.7~1.05, fire coal carry out low oxygen combustion；The excess air coefficient of burning-out zone is
1.05~1.3, carry out oxygen-enriched combusting；Also sprayed into also by the reduction wind snout between main burner and fire air nozzle on furnace wall
The excess air coefficient of former wind, reduction wind is 0.6~0.85；One layer or more is sprayed into top layer's burnout degree burner hearth below
Amino reduction inhibitor agent, the nitrogen oxides in burner hearth under hot environment in reduction flue gas, and inhibit new nitrogen oxides life
At；
The present invention can mix the amino reduction inhibitor agent in a wind snout of several main burners with fire coal leads to
First air is crossed to spray into burner hearth；
The present invention can also be sprayed by being set to independent reduction inhibitor agent spout in wind snout of several main burners
The amino reduction inhibitor agent；
Reduction inhibitor agent spout can also be set on chimney arch by the present invention, and amino reduction inhibitor agent is parallel with First air
Direction sprays into burner hearth；
The present invention between overfire air port or can also be set to by reduction inhibitor agent spout or set on main burner and under encircleing
On the lower overfire air port of arch or set between main burner and fire air nozzle or between several layers of fire air nozzle, lead to
Cross the amino reduction inhibitor agent that reduction inhibitor agent spout sprays into one layer or more in top layer's burnout degree burner hearth below；
The present invention can also be independent also by described one layer or more between reduction wind snout and fire air nozzle
Former inhibitor spout sprays into the amino reduction inhibitor agent；
The present invention can also pass through the reburning fuel spout between main burner and fire air nozzle on front and back furnace wall
Reburning fuel is sprayed into, is sprayed by described one layer or more of the reduction inhibitor agent between reburning fuel spout and fire air nozzle
Mouth sprays into amino reduction inhibitor agent；
The present invention controls excess air system by being passed through amino reduction inhibitor agent in top layer's burnout degree burner hearth below
Number is depleted substantially in lower range, the herein oxygen in flue gas, in reducing atmosphere, very due to conversion zone temperature
Height does not need catalyst, and the nitrogen oxides in flue gas is strengthened reduction by amino reduction inhibitor agent, and inhibits nitrogen oxygen in the atmosphere
The generation of compound so that the nitrous oxides concentration into burning-out zone substantially reduces, and uncombusted fuel obtains fully in burning-out zone
Burning, it is ensured that efficiency of combustion, newly generated nitrogen oxides is limited plus the nitrogen oxides into burning-out zone, this regional temperature is still
It is higher, it can continue to restore by the amino reduction inhibitor agent in flue gas so that the discharged nitrous oxides value of furnace outlet significantly reduces,
Realize minimum discharge characteristic；This method is compared to existing selective non-catalytic reduction technology（SNCR）And selective catalytic reduction
Technology（SCR）, stringent temperature window and catalyst are not needed, denitration cost is significantly reduced, even if the highest combustion in stove
It burns under the flue-gas temperature of region, will not still lead to a large amount of oxidations of ammonia, remarkable in economical benefits, and there is wide applicability.
The reduction inhibitor agent spout is preferably set on burner hearth quadrangle and front-back wall, passes through by one kind as the present invention
Several reduction inhibitor agent spouts spray into the amino reduction inhibitor agent, and the amino reduction inhibitor agent of same layer in burner hearth to form one
The mode of a above imaginary circle sprays into；Not only the good burning situation of burner hearth had been kept, but also has ensured amino reduction inhibitor agent and flue gas
Be sufficiently mixed；
The reduction inhibitor agent spout is preferably set on burner hearth front-back wall and side wall, passes through by one kind as the present invention
Several reduction inhibitor agent spouts spray into the amino reduction inhibitor agent, and the amino reduction inhibitor agent of same layer in burner hearth to form one
The mode of a above imaginary circle sprays into；Equally not only kept the good burning situation of burner hearth, but ensure amino reduction inhibitor agent with
Flue gas is sufficiently mixed；
One kind as the present invention preferably, will be set to positioned at the reduction inhibitor agent spout of front-back wall height before and after burner hearth
On wall, reduction inhibitor agent spout central line is conllinear on front-back wall, by same layer with respect to the amino reduction inhibitor agent on front-back wall with right
The mode of punching sprays into；It can reach preferable mixed effect；
Preferably reducing agent delivery pipe is arranged in one kind as the present invention at least one side front-back wall or side wall, will be described
Reduction inhibitor agent spout is set in corresponding reducing agent delivery pipe, and amino reduction inhibitor agent is sprayed by reduction inhibitor agent spout；
Preferable mixed effect is can reach, different operating modes is suitable for.
One kind as the present invention preferably passing through wind turbine extraction section cigarette from back-end ductwork after or before boiler air preheater
Pumped (conveying) medium of the gas as amino reduction inhibitor agent mixes latter with from reduction inhibitor agent spout with the amino reduction inhibitor agent
Spray into burner hearth；It more conducively realizes the reducing atmosphere of burner hearth and improves conversion zone temperature；
One kind as the present invention is preferred, in the front-back wall both sides of the edge of the close both walls of burner hearth reducing zone and primary zone
It is respectively provided with purging wind snout, purging wind is sprayed into the close side wall region of burner hearth by purging wind snout, purges the excess air of wind
Coefficient is 0.85~0.95；Air is supplemented close to side wall region by purging wind direction burner hearth, avoids the stream of neighbouring side water wall
The poor flue gas of dynamic property forms strongly reducing atmosphere, prevents the coking in this atmosphere of the flying dust of low-volatite coal from forming height to water-cooling wall
Temperature corrosion.
One kind as the present invention preferably, by two chimney arch close to the main burner of both walls with to 5 ° of burner hearth center-biased
~45 ° of direction sprays into coal-fired, First air and Secondary Air；Side wall caused by Involving velocity to alleviate this edge main burner is attached
The phenomenon that nearly atmosphere is in strong reducing property, mitigates the high temperature corrosion of water-cooling wall.
In conclusion the present invention can not only significantly reduce the discharged nitrous oxides value of furnace outlet, minimum discharge is realized, and
Stringent temperature window and catalyst are not needed, denitration cost is significantly reduced, efficiency of combustion also can guarantee, economic benefit is aobvious
It writes, and prevents water-cooling wall in stove from high temperature corrosion occur, and there is wide applicability.
Description of the drawings
Fig. 1 is the W flame boiler schematic diagram using the embodiment of the present invention one.
Fig. 2 is the end view of main burner in Fig. 1.
Fig. 3 is the front view of burner hearth front wall in Fig. 1.
Fig. 4 is the W flame boiler schematic diagram using the embodiment of the present invention two.
Fig. 5 is the end view of main burner in Fig. 4.
Fig. 6 is the W flame boiler schematic diagram using the embodiment of the present invention three.
Fig. 7 is the W flame boiler schematic diagram using the embodiment of the present invention four.
Fig. 8 is that one layer of reduction inhibitor agent spout arranges schematic diagram in Fig. 7.
Fig. 9 is the W flame boiler schematic diagram using the embodiment of the present invention five.
Figure 10 is the W flame boiler schematic diagram using the embodiment of the present invention six.
Figure 11 is the W flame boiler schematic diagram using the embodiment of the present invention seven.
Figure 12 is the end view of reburning fuel spout in Figure 11.
Figure 13 is the W flame boiler schematic diagram using the embodiment of the present invention eight.
Figure 14 is the structure diagram of reduction inhibitor agent delivery pipe on rear wall in Figure 13.
Figure 15 is the front view of burner hearth front wall in Figure 13.
Figure 16 is the W flame boiler schematic diagram using the embodiment of the present invention nine.
Figure 17 is that one layer of reduction inhibitor agent spout arranges schematic diagram in Figure 16.
Figure 18 is a kind of one layer of reduction inhibitor agent spout arrangement schematic diagram.
Specific implementation mode
Below in conjunction with the accompanying drawings, the present invention is described in further detail.
Embodiment one
As shown in Figure 1, Figure 2, Figure 3 shows, the W flame boiler, burner hearth front wall 7,8 top of rear wall are equipped with several burnout degree sprays
Mouthfuls 4, several main burners 1 are equipped on its two chimney arch, its burner hearth front wall 7,8 lower part of rear wall are equipped with two under more than one arch
Secondary wind snout 5 and lack of gas wind snout 6, main burner 1 is interior to be equipped with a wind snout 2 and overfire air port 3, and main burner 1 can be adopted
With DC burner or turbulent burner, per chimney arch on several main burners 1 be arranged in a linear, close to both walls on two chimney arch
9 main burner 1 is to 5 °~45 ° of burner hearth center-biased；Reduction wind between main burner 1 and fire air nozzle 4 on furnace wall
Spout；Burner hearth is divided into primary zone 14, reducing zone 12 and burning-out zone 13 from bottom to up, in leaning on for burner hearth reducing zone 12 and primary zone 14
The front-back wall both sides of the edge of nearly both walls 9 are respectively provided with purging wind snout 10 and 11；A kind of W flame boiler for deeply of the present embodiment is de-
Nitre combustion method, the First air in the wind snout 2 that fire coal is passed through several main burners 1 on front-back wall chimney arch are sent into burner hearth
Burning sprays into amino reduction inhibitor agent after a wind snout 2 of several main burners 1 is mixed with fire coal also by First air
In burner hearth, and Secondary Air is passed through by the overfire air port of several main burners 13, wherein close to the master of both walls 9 on two chimney arch
Burner 1 is logical to spray into fire coal, First air, Secondary Air and amino reduction inhibitor agent to the direction of 5 °~45 ° of burner hearth center-biased
Over-blowing swing flap spout 10 sprays into purging wind to the close side wall region of burner hearth, and the excess air coefficient for purging wind is 0.85~0.95,
It is passed through the lower Secondary Air of arch by overfire air port 5 under the arch on front-back wall, lack of gas wind is passed through by lack of gas wind snout 6, in after-flame
Area is passed through several floor burnout degrees, the wherein excess air coefficient in primary zone ranging from 0.7~1.05 by fire air nozzle 4, coal-fired
Carry out low oxygen combustion；The excess air coefficient of burning-out zone is 1.05~1.3, carries out oxygen-enriched combusting；Pass through main burner and after-flame
Reduction wind snout between wind snout on furnace wall sprays into reduction wind, and the excess air coefficient of reduction wind is 0.6~0.85；Amino is also
Former inhibitor restores the nitrogen oxides in flue gas in burner hearth under hot environment；
The present embodiment in the main burner 1 in primary zone 14 by being passed through amino reduction inhibitor agent（The method of being mixed into can be
It is mixed, can also be blended with fire coal in advance by air duct）, and excess air coefficient is controlled in lower range, herein in flue gas
Oxygen is depleted substantially, in reducing atmosphere, since conversion zone temperature is very high, does not need catalyst, amino reduction suppression
Nitrogen oxides in flue gas is strengthened reduction by preparation, and inhibits the generation of nitrogen oxides in this atmosphere so that enters burning-out zone
Nitrous oxides concentration substantially reduce, uncombusted fuel is fully burned in burning-out zone, it is ensured that efficiency of combustion, it is new to generate
Nitrogen oxides add into burning-out zone nitrogen oxides it is limited, this regional temperature is still higher, can be restored by the amino in flue gas
Inhibitor continues to restore so that the discharged nitrous oxides value of furnace outlet significantly reduces, and realizes minimum discharge characteristic；Pass through excess
Air coefficient is that 0.85~0.95 purging wind direction burner hearth supplements air close to side wall region, avoids the flowing of neighbouring side water wall
Property poor flue gas form strongly reducing atmosphere, prevent the coking in this atmosphere of the flying dust of low-volatite coal from forming high temperature to water-cooling wall
Corrosion, plus on two chimney arch close to the main burner 1 of both walls 9 with to the direction of 5 °~45 ° of burner hearth center-biased spray into fire coal,
First air, Secondary Air and amino reduction inhibitor agent, gas near side wall caused by the Involving velocity to alleviate this edge main burner
The phenomenon that atmosphere is in strong reducing property further mitigates the high temperature corrosion of water-cooling wall；This method is compared to existing selective non-catalytic
Reduction technique（SNCR）And SCR technology（SCR）, stringent temperature window and catalyst are not needed, is greatly reduced
Denitration cost, even if in stove under highest combustion zone flue-gas temperature, will not still lead to a large amount of oxidations of ammonia, economic benefit
Significantly, and there is wide applicability.
Embodiment two
As shown in Figure 4, Figure 5, the present embodiment and embodiment one differ only in：In the First air of several main burners 1
The independent reduction inhibitor agent spout 15 of setting in spout 2, reduction inhibitor agent spout 15 by air hose and wind turbine 16 and air preheater it
Back-end ductwork afterwards is connected, and reduction inhibitor agent feed pipe 17 is connected on air hose；When burning, from tail portion cigarette after boiler air preheater
The pumped (conveying) medium of amino reduction inhibitor agent is used as in road by 16 extraction section flue gas of wind turbine, is mixed with the amino reduction inhibitor agent
It is latter to spray into burner hearth with from reduction inhibitor agent spout 15；Since the flue gas of extraction is micro- oxygen, the present embodiment is more conducive to realize burner hearth
Reducing atmosphere and improve conversion zone temperature；
Embodiment three
As shown in fig. 6, the present embodiment and embodiment two differ only in：Several reduction inhibitor agent spouts 18 are set to stove
On arch；When burning, it is used as amino reduction inhibitor agent from back-end ductwork before boiler air preheater by 16 extraction section flue gas of wind turbine
Pumped (conveying) medium, mixed with the amino reduction inhibitor agent latter with from the direction parallel with First air of reduction inhibitor agent spout 18
Spray into burner hearth；Technique effect identical with embodiment two can be achieved.
Example IV
As shown in Figure 7, Figure 8, the present embodiment and embodiment three differ only in：Several reduction inhibitor agent spouts 19 are set
On burner hearth quadrangle and front wall 7, rear wall 8 under main burner 1 and arch between overfire air port 5, it is located at eight reduction of same layer
Four are located at burner hearth quadrangle in inhibitor spout 19, and other four is located at front wall 7, on rear wall 8；When burning, from boiler air preheater it
Back-end ductwork is used as the pumped (conveying) medium of amino reduction inhibitor agent by 16 extraction section flue gas of wind turbine afterwards, restores and presses down with the amino
Preparation mix it is latter with from reduction inhibitor agent spout 19 by burner hearth formed two imaginary circles in a manner of spray into；Wherein restore
19 aperture of inhibitor spout is 1~10mm, is open as sector, opening angle between 10 °~150 °, amino reduction inhibitor agent
Speed is sprayed between 10m/s~400m/s, it is big that the deflection angle of adjustment reduction inhibitor agent spout 19 can adjust tangential circle diameter
Small and direction of rotation meets the needs of different operating modes；The present embodiment had not only kept the good burning situation of burner hearth, but also ensured reduction suppression
Preparation and flue gas are sufficiently mixed, and are conducive to improve denitration effect；
Embodiment five
As shown in figure 9, the present embodiment and embodiment three differ only in：By lack of gas wind snout 6 be set to main burner 1 with
On front wall 7 and rear wall 8 between fire air nozzle 4, several reduction wind snouts 20 are set to the front wall 7 of 6 lower section of lack of gas wind snout
On rear wall 8；When burning, it is used as amino reduction suppression from back-end ductwork before boiler air preheater by 16 extraction section flue gas of wind turbine
The pumped (conveying) medium of preparation, mixed with the amino reduction inhibitor agent it is latter with from reduction inhibitor agent spout 20 spray into；
The reduction wind that the present embodiment is 0.6~0.85 by spraying into excess air coefficient, can be improved the reducing atmosphere in stove,
The amino reduction inhibitor agent sprayed into a manner of liquidating, reduction inhibitor agent spout aperture are 1~10mm, are open as sector, angular aperture
Degree sprays into speed between 10m/s~400m/s, penetration power and coverage area can reach and flue gas between 10 °~150 °
Well-mixed purpose can meet the needs of different coal-fired types.
Embodiment six
As shown in Figure 10, the present embodiment and embodiment five differ only in：Fire air nozzle 4 is multi-tier arrangement, reduction
Inhibitor spout 21 is set between multilayer fire air nozzle 4；When burning, pass through wind turbine 16 from back-end ductwork after boiler air preheater
Pumped (conveying) medium of the extraction section flue gas as amino reduction inhibitor agent mixes latter with from reduction with the amino reduction inhibitor agent
Agent spout 20 sprays into；
The fire air nozzle 4 of the present embodiment multi-tier arrangement has the effect of preferably reducing discharged nitrous oxides, therefore fires
The air quantity that wind snout 4 can adjust every layer according to fuel characteristic to the greatest extent reduces the production quantity of nitrogen oxides, has as possible to optimal proportion
Conducive to realization minimum discharge characteristic；
Embodiment seven
As shown in Figure 11, Figure 12, the present embodiment is differed only in embodiment two：Before below the fire air nozzle 4
Wall 7 and rear wall 8 are equipped with reburning fuel spout 22, are equipped in reburning fuel spout 22 and fire wind snout 23 and overfire air port again
24, the reduction inhibitor agent spout 25 of the present embodiment can be set to fires wind snout 23 again, can also be set to fire air nozzle 4 and reburning fuel
On front wall 7 and rear wall 8 between spout 22（It is not shown）；When burning, pass through wind turbine 16 from back-end ductwork after boiler air preheater
Pumped (conveying) medium of the extraction section flue gas as amino reduction inhibitor agent mixes latter with from reduction with the amino reduction inhibitor agent
Inhibitor spout 25 sprays into；The present embodiment is suitable for the W flame boiler using reburning technology, equally can reach the out of stock mesh of depth
's.
Embodiment eight
As shown in Figure 13, Figure 14, Figure 15, the present embodiment is differed only in embodiment two：In main burner 1 and after-flame
Front wall 7 and rear wall 8 between wind snout 4 are equipped with reduction wind snout 26, between reduction wind snout 26 and fire air nozzle 4
Reduction inhibitor agent delivery pipe 27 is set on wall 8 afterwards, the reduction inhibitor agent spout 28 is conveyed set on corresponding reduction inhibitor agent
On pipe 27, the main burner 1 on two chimney arch close to both walls 9 is to 5 °~45 ° of burner hearth center-biased, in burner hearth reducing zone and main combustion
The front-back wall both sides of the edge of the close both walls 9 in area are respectively provided with purging wind snout 10 and 11；When burning, by restoring wind snout 26
Reduction wind is sprayed into, the excess air coefficient of reduction wind is 0.6~0.85, passes through wind turbine 16 from back-end ductwork after boiler air preheater
Pumped (conveying) medium of the extraction section flue gas as amino reduction inhibitor agent mixes latter with from reduction with the amino reduction inhibitor agent
The reduction inhibitor agent spout 28 of inhibitor delivery pipe 27 sprays into burner hearth；On wherein two chimney arch close to the main burner 1 of both walls 9 with
Fire coal, First air, Secondary Air are sprayed into 5 °~45 ° of direction of burner hearth center-biased, it is close to burner hearth by purging wind snout 10
Side wall region sprays into purging wind, and the excess air coefficient for purging wind is 0.85~0.95；Going back for burning-out zone can be improved in the present embodiment
Former area's atmosphere, while the flue gas for avoiding the mobility of neighbouring side water wall poor forms strongly reducing atmosphere, prevents low volatile
The coking in this atmosphere of the flying dust of coal forms high temperature corrosion to water-cooling wall, in addition close to the main burner 1 of both walls 9 on two chimney arch
To spray into fire coal, First air, Secondary Air to the direction of 5 °~45 ° of burner hearth center-biased, to alleviate the volume of this edge main burner
The phenomenon that atmosphere is in strong reducing property near side wall caused by suction acts on further mitigates the high temperature corrosion of water-cooling wall.
Embodiment nine
As shown in Figure 16, Figure 17, the present embodiment and example IV differ only in：By several reduction inhibitor agent spouts 29
On the front wall 7 under weary wind snout 6, rear wall 8 and side wall 9 under chimney arch, it is located at 12 reducing agent spouts of same layer
Eight are located on front wall 7 and rear wall 8 in 29, and other four is located in both walls 9；When burning, from tail portion cigarette after boiler air preheater
The pumped (conveying) medium of amino reduction inhibitor agent is used as in road by 16 extraction section flue gas of wind turbine, is mixed with the amino reduction inhibitor agent
It is latter to be sprayed into a manner of forming two imaginary circles in burner hearth with from reduction inhibitor agent spout 29；The present embodiment both keeps stove
The good burning situation of thorax, and ensure being sufficiently mixed for amino reduction inhibitor agent and flue gas, it is conducive to improve denitration effect；This implementation
Example also can be as shown in figure 18, and several reduction inhibitor agent spouts 30 are set in a manner of liquidating on side wall, different operating modes is met.
The present invention is not limited to the above embodiments, such as installation position and the form of penetrating of reduction inhibitor agent spout（It is the circle of contact, right
Punching, delivery pipe spray into）Combining form can also be varied, as reduction inhibitor agent spout be set to arch on main burner and fire again
Between fuel nozzle ports or under the lower overfire air port of arch, the penetrating form of its levels of multilayer reducing agent spout can not
Together, they are all belonged to the scope of protection of the present invention.
Claims (22)
1. a kind of W flame boiler for deeply denitration combustion method, by fire coal by front-back wall chimney arch several main burners it is primary
First air in wind snout is sent into hearth combustion, and is passed through Secondary Air by the overfire air port of several main burners, by preceding
Overfire air port is passed through the lower Secondary Air of arch under the arch on wall afterwards, is passed through lack of gas wind by the lack of gas wind snout on front-back wall, is firing
Area is passed through the burnout degree of a floor or more by fire air nozzle to the greatest extent, it is characterised in that：The wherein excess air coefficient model in primary zone
It is 0.7~1.05 to enclose, and fire coal carries out low oxygen combustion；The excess air coefficient of burning-out zone is 1.05~1.3, carries out oxygen-enriched combusting；
Reduction wind, the excess air system of reduction wind are also sprayed by the reduction wind snout between main burner and fire air nozzle on furnace wall
Number is 0.6~0.85；The amino reduction inhibitor agent that one layer or more is sprayed into top layer's burnout degree burner hearth below, in burner hearth
The nitrogen oxides in flue gas is restored under hot environment.
2. a kind of W flame boiler for deeply denitration combustion method according to claim 1, it is characterised in that：By the amino
Reduction inhibitor agent is mixed with fire coal in a wind snout of several main burners and is sprayed into burner hearth by First air.
3. a kind of W flame boiler for deeply denitration combustion method according to claim 1, it is characterised in that：Pass through top layer
The independent reduction inhibitor agent spout of one layer below of burnout degree or more sprays into the amino reduction inhibitor agent, and same layer spout is located at same
One horizontal plane.
4. a kind of W flame boiler for deeply denitration combustion method according to claim 3, it is characterised in that：By being set to number
Independent reduction inhibitor agent spout sprays into the amino reduction inhibitor agent in wind snout of a main burner.
5. a kind of W flame boiler for deeply denitration combustion method according to claim 3, it is characterised in that：Reduction is inhibited
Agent spout is set on chimney arch, and the amino reduction inhibitor agent direction parallel with First air is sprayed into burner hearth.
6. a kind of W flame boiler for deeply denitration combustion method according to claim 3, it is characterised in that：Reduction is inhibited
Agent spout between overfire air port or is set under the lower overfire air port of arch or set on main combustion set on main burner and under encircleing
Between burner and fire air nozzle or between several layers of fire air nozzle.
7. a kind of W flame boiler for deeply denitration combustion method according to claim 3, it is characterised in that：By being set to also
Described one layer or more independent reduction inhibitor agent spout between former wind snout and fire air nozzle sprays into the amino reduction suppression
Preparation.
8. a kind of W flame boiler for deeply denitration combustion method according to claim 3, it is characterised in that：Also by being set to
Reburning fuel spout between main burner and fire air nozzle on front and back furnace wall sprays into reburning fuel, by being set to reburning fuel
Described one layer or more of reduction inhibitor agent spout between spout and fire air nozzle sprays into amino reduction inhibitor agent.
9. according to a kind of any W flame boiler for deeply denitration combustion method of claim 6 to 8, it is characterised in that：By institute
Reduction inhibitor agent spout is stated on burner hearth quadrangle and front-back wall, spraying into the amino by several reduction inhibitor agent spouts restores
The amino reduction inhibitor agent of inhibitor, same layer is sprayed into a manner of forming more than one imaginary circle in burner hearth.
10. according to a kind of any W flame boiler for deeply denitration combustion method of claim 6 to 8, it is characterised in that：It will
The reduction inhibitor agent spout is set on burner hearth front-back wall and side wall, and the amino is sprayed into also by several reduction inhibitor agent spouts
The amino reduction inhibitor agent of former inhibitor, same layer is sprayed into a manner of forming more than one imaginary circle in burner hearth.
11. according to a kind of any W flame boiler for deeply denitration combustion method of claim 6 to 8, it is characterised in that：It will
The reduction inhibitor agent spout is set on burner hearth front-back wall, and reduction inhibitor agent spout central line is conllinear on front-back wall, by same layer phase
Amino reduction inhibitor agent on front-back wall is sprayed into a manner of liquidating.
12. according to a kind of any W flame boiler for deeply denitration combustion method of claim 6 to 8, it is characterised in that：
Reducing agent delivery pipe is set at least one side front-back wall or side wall, and it is defeated that the reduction inhibitor agent spout is set to corresponding reducing agent
It send on pipe, amino reduction inhibitor agent is sprayed by reduction inhibitor agent spout.
13. a kind of W flame boiler for deeply denitration combustion method according to claim 3, it is characterised in that：Also by being set to
Reburning fuel spout above main burner on two chimney arch sprays into reburning fuel, by being set to main burner and reburning fuel spout
Between described one layer or more of reduction inhibitor agent spout on two chimney arch by the amino reduction inhibitor agent direction parallel with First air
Spray into burner hearth.
14. a kind of W flame boiler for deeply denitration combustion method according to claim 3, it is characterised in that：Also by being set to
Reburning fuel spout between main burner and fire air nozzle between front and back furnace wall sprays into reburning fuel, fires combustion again by being set to
Expect that described one layer or more of reduction inhibitor agent spout in spout sprays into amino reduction inhibitor agent.
15. a kind of W flame boiler for deeply denitration burning side according to claim 3 or 4 or 5 or 6 or 7 or 8 or 13 or 14
Method, it is characterised in that：It is used as amino reduction from back-end ductwork after or before boiler air preheater by wind turbine extraction section flue gas
The pumped (conveying) medium of inhibitor, mixed with the amino reduction inhibitor agent it is latter with from reduction inhibitor agent spout spray into burner hearth.
16. a kind of W flame boiler for deeply denitration combustion method according to claim 9, it is characterised in that：It is empty pre- from boiler
Back-end ductwork is used as the pumped (conveying) medium of amino reduction inhibitor agent by wind turbine extraction section flue gas after or before device, with the ammonia
The mixing of base reduction inhibitor agent is latter to spray into burner hearth with from reduction inhibitor agent spout.
17. a kind of W flame boiler for deeply denitration combustion method according to claim 10, it is characterised in that：From boiler sky
Back-end ductwork is used as the pumped (conveying) medium of amino reduction inhibitor agent by wind turbine extraction section flue gas after or before pre- device, and described
The mixing of amino reduction inhibitor agent is latter to spray into burner hearth with from reduction inhibitor agent spout.
18. a kind of W flame boiler for deeply denitration combustion method according to claim 11, it is characterised in that：From boiler sky
Back-end ductwork is used as the pumped (conveying) medium of amino reduction inhibitor agent by wind turbine extraction section flue gas after or before pre- device, and described
The mixing of amino reduction inhibitor agent is latter to spray into burner hearth with from reduction inhibitor agent spout.
19. a kind of W flame boiler for deeply denitration combustion method according to claim 12, it is characterised in that：From boiler sky
Back-end ductwork is used as the pumped (conveying) medium of amino reduction inhibitor agent by wind turbine extraction section flue gas after or before pre- device, and described
The mixing of amino reduction inhibitor agent is latter to spray into burner hearth with from reduction inhibitor agent spout.
20. a kind of W flame boiler for deeply denitration combustion method according to any one of claims 1 to 8, it is characterised in that：
The front-back wall both sides of the edge of the close both walls of burner hearth reducing zone and primary zone are respectively provided with purging wind snout, by purging wind snout
Purging wind is sprayed into the close side wall region of burner hearth, the excess air coefficient for purging wind is 0.85~0.95.
21. a kind of W flame boiler for deeply denitration combustion method according to claim 9, it is characterised in that：It is restored in burner hearth
The front-back wall both sides of the edge of the close both walls in area and primary zone are respectively provided with purging wind snout, are leaned on to burner hearth by purging wind snout
Nearside wall zone sprays into purging wind, and the excess air coefficient for purging wind is 0.85~0.95.
22. a kind of W flame boiler for deeply denitration combustion method according to any one of claims 1 to 8, it is characterised in that：It will
Close to the main burner of both walls to spray into coal-fired, First air and two to the direction of 5 °~45 ° of burner hearth center-biased on two chimney arch
Secondary wind.
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| CN106871111B (en) * | 2017-03-21 | 2023-08-08 | 中国华能集团公司 | W flame boiler composite denitration system and method |
| CN107559858B (en) * | 2017-09-12 | 2019-03-08 | 哈尔滨工业大学 | Turbulent burner W flame boiler with interior straight outward turning ammonia-gas spraying device |
| CN107543148B (en) * | 2017-09-12 | 2019-01-22 | 哈尔滨工业大学 | Porous ammonia-gas spraying device for W flame boiler high temperature reducing zone |
| CN107715668A (en) * | 2017-10-30 | 2018-02-23 | 东方电气集团东方锅炉股份有限公司 | A kind of flue gas high concentrate NOx realizes the device of minimum discharge |
| CN108916864B (en) * | 2018-07-13 | 2024-01-23 | 西安热工研究院有限公司 | Supercritical carbon dioxide cyclone furnace for reducing nitrogen oxides based on ammonia spraying in high-temperature reduction zone |
| CN109945167B (en) * | 2019-03-11 | 2019-12-03 | 哈尔滨工业大学 | A kind of front wall, the asymmetrical W flame boiler of rear wall Secondary Air |
| CN111457360B (en) * | 2020-03-16 | 2021-05-04 | 哈尔滨工业大学 | W flame boiler with anti-slagging air |
| CN113074376B (en) * | 2021-03-24 | 2022-10-25 | 西安交通大学 | Gasification fly ash low NO x Combustion fusion processing system and method |
| CN114165780B (en) * | 2021-11-01 | 2023-08-22 | 东方电气集团东方锅炉股份有限公司 | W flame boiler combustion device |
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| CN1148527C (en) * | 2001-05-18 | 2004-05-05 | 清华大学 | Method and apparatus for reducing exhaustion of nitrogen oxides from coal-fired boiler |
| US6979430B2 (en) * | 2002-12-18 | 2005-12-27 | Foster Wheeler Energy Corporation | System and method for controlling NOx emissions from boilers combusting carbonaceous fuels without using external reagent |
| CN100464122C (en) * | 2007-02-28 | 2009-02-25 | 哈尔滨工业大学 | Method of decreasing release of nitrogen oxide in the pulverized-coal fired boiler and its used boiler |
| CN100491822C (en) * | 2007-03-14 | 2009-05-27 | 哈尔滨工业大学 | Method of denitration utilizing biomass direct burning and smoke gas recirculating technology |
| CN102679309B (en) * | 2012-06-08 | 2015-11-18 | 哈尔滨锅炉厂有限责任公司 | 350MW MW supercritical W flame anthracite boiler |
| CN103104910B (en) * | 2013-02-18 | 2015-09-23 | 上海锅炉厂有限公司 | A kind of micro-oxygen-enriched combusting W flame boiler and CO 2emission-reducing system |
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