CN106247320B - A kind of opposed firing boiler depth denitration combustion method - Google Patents

A kind of opposed firing boiler depth denitration combustion method Download PDF

Info

Publication number
CN106247320B
CN106247320B CN201610608059.8A CN201610608059A CN106247320B CN 106247320 B CN106247320 B CN 106247320B CN 201610608059 A CN201610608059 A CN 201610608059A CN 106247320 B CN106247320 B CN 106247320B
Authority
CN
China
Prior art keywords
inhibitor agent
reduction inhibitor
reduction
spout
burner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201610608059.8A
Other languages
Chinese (zh)
Other versions
CN106247320A (en
Inventor
陈灿
王勇
范卫东
胡修奎
周棋
刘泰生
但家瑜
李旭升
刘亚成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Jiaotong University
Dongfang Boiler Group Co Ltd
Original Assignee
Shanghai Jiaotong University
Dongfang Boiler Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Jiaotong University, Dongfang Boiler Group Co Ltd filed Critical Shanghai Jiaotong University
Priority to CN201610608059.8A priority Critical patent/CN106247320B/en
Publication of CN106247320A publication Critical patent/CN106247320A/en
Application granted granted Critical
Publication of CN106247320B publication Critical patent/CN106247320B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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 
    • F23C5/00Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08Disposition of burners
    • F23C5/28Disposition of burners to obtain flames in opposing directions, e.g. impacting flames
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

The invention discloses a kind of opposed firing boiler depth denitration combustion methods, fire coal is sprayed into hearth combustion by the First air in a wind snout of several turbulent burners, it is passed through burnout degree by the fire air nozzle on front-back wall, the excess air coefficient in the primary zone wherein where turbulent burner ranging from 0.5~1.05, fire coal carry out low oxygen combustion;The excess air coefficient of burning-out zone where fire air nozzle is 1.05~1.3, carries out oxygen-enriched combusting;Reduction wind is also sprayed by the reduction wind snout between turbulent 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, and inhibit new NO_x formation.The present invention can not only significantly reduce the discharged nitrous oxides value of furnace outlet, realize minimum discharge, and do not need stringent temperature window and catalyst, significantly reduce denitration cost, remarkable in economical benefits, and prevent water-cooling wall in stove from high temperature corrosion occur, there is wide applicability.

Description

A kind of opposed firing boiler depth denitration combustion method
Technical field
The present invention relates to a kind of denitration combustion methods for opposed firing boiler.
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).
Using the opposed firing boiler of vortex burner compared with the Process In A Tangential Firing for using straight-through pulverized coal burner, Solving stable combustion problem etc. has the advantages that its uniqueness, however compares tangential boiler, and the inner flue gas of the stove of opposed firing boiler mixes situation It is unsatisfactory.Therefore, it is more difficult to generate control by the NOx in combustion process.
Currently, the denitration technology applied in engineering is divided into two kinds of denitration in the stove and tail portion denitration.Denitration in the stove includes using Low-NOx combustor, air classification, fuel fires again, selective non-catalytic reduction(SNCR)Etc. technologies, tail portion denitration include selectivity Catalysis reduction(SCR), the technologies such as activated carbon adsorption.
In order to which the generation discharge of stove combustion process NOx is greatly lowered, opposed firing boiler can use larger air classification journey The after-flame wind system of degree, but the degree of control NOx emission and flue gas temperature of hearth outlet rising cause spray water flux to increase and lead Cause the increased contradiction of unburned carbon in flue dust in flue gas often more prominent compared with quadrangle tangential circle Researched of Air Staging Combustion Burning Pulverized Coal, this can to boiler Influence is brought by economical operation.Meanwhile opposed firing boiler is by the jet direction and side wall of the side wall burner nozzle of side wall arrangement Between being emptied there are stronger volume between wall surface, the breeze airflow for easily leading to the burner injection by side wall is biased to this space, but The combustion equivalent of coal dust and air mismatches, and coal dust is often in anoxycausis state, and side wall is made to be formed about strong reducing property gas Atmosphere, flying dust easily form corrosive bur in this atmosphere, aggravate the high temperature corrosion of the water-cooling wall metal outer pipe wall in this region. In order to reach more preferably NOx emission control effect, air classification degree must be increased, but with the increase of classification degree, 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.Meanwhile it is single The pure denitration technology using by controlling stove combustion process(Such as air classification and reburning technology), NOx reduction efficiency is only 30%~70% or so, it cannot still meet the discharge standard of country.Therefore, it is necessary to further decrease NOx using other technologies simultaneously Discharge.
Currently, joint low NOx combusting technology realizes that effective denitration technology of qualified discharge control is selective catalytic reduction Technology(SCR)Technology, it is a kind of tail portion denitration technology of maturation, and power plant generally uses at home, in burner hearth low NOx combustion base Further depth denitration is carried out on plinth.So with the low NOx combusting technology of air deep-graded and SCR denitration technical tie-up Two-in-one denitration mode is gradually at the standard configuration of power plant.But the core of SCR technology is to spray into ammonia agent in back-end ductwork urging Restore the nitrogen oxides in flue gas under the action of agent, the temperature of running environment needs to control at 300 DEG C~400 DEG C, temperature window Mouth is narrow, and the excessively high ammonia of temperature can be oxidized to NOx instead, in addition, ammonia amount control is improper also to cause the escaping of ammonia.Reaction process needs Expensive catalyst, and the catalyst of failure need to be regularly replaced, therefore, its denitration 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 opposed firing boiler depth 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, remarkable in economical benefits, and prevent water-cooling wall in stove from high temperature corrosion occur, have Wide applicability.
In order to achieve the above object, a kind of opposed firing boiler depth denitration combustion method of the invention passes through number on front-back wall Fire coal is sprayed into hearth combustion by the First air in layer, a wind snout per the number of plies turbulent burner, and passes through swirl flow combustion The overfire air port of device sprays into Secondary Air, burnout degree is passed through by fire air nozzle more than front-back wall last layer, on front-back wall First air and Secondary Air liquidate penetrating, it is characterised in that:The excess air coefficient in the primary zone wherein where turbulent burner Ranging from 0.5~1.05, fire coal carries out low oxygen combustion;The excess air coefficient of burning-out zone where fire air nozzle be 1.05~ 1.3, carry out oxygen-enriched combusting;Reduction is also sprayed by the reduction wind snout between turbulent burner and fire air nozzle on furnace wall The excess air coefficient of wind, reduction wind is 0.6~0.85;One layer or more of ammonia is sprayed into top layer's burnout degree burner hearth below Base reduction inhibitor agent, the nitrogen oxides in burner hearth under hot environment in reduction flue gas;
The present invention can be by the amino reduction inhibitor agent and the First air by several turbulent burners after coal-fired mix First air in spout sprays into burner hearth;
The present invention can also spray into institute by the independent reduction inhibitor agent spout of one layer below of top layer's burnout degree or more Amino reduction inhibitor agent is stated, same layer spout is located at same level;
Specifically, the present invention can be sprayed by being set to independent reduction inhibitor agent in wind snout of several turbulent burners Mouth sprays into the amino reduction inhibitor agent;The reduction inhibitor agent spout end is located at outside the end of a wind snout, can avoid few Measure the oxidation of amino reduction inhibitor agent;
The present invention can by reduction inhibitor agent spout or between two layers turbulent burner or set on turbulent burner with Reducing zone between fire air nozzle or between several layers of fire air nozzle;By above-mentioned reduction inhibitor agent spout most upper One layer or more of amino reduction inhibitor agent is sprayed into layer 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 be sprayed by the reburning fuel between turbulent burner and fire air nozzle on front and back furnace wall Mouth sprays into reburning fuel, passes through described one layer or more of the reduction inhibitor agent between reburning fuel spout and fire air nozzle Spout sprays into the amino reduction inhibitor agent;
The present invention can also be sprayed by the reburning fuel between turbulent burner and fire air nozzle on front and back furnace wall Mouth sprays into reburning fuel, and the reduction inhibitor agent spout passed through in reburning fuel spout sprays into the 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 this 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;
The reduction inhibitor agent spout is preferably set on burner hearth front-back wall by one kind as the present invention, on front-back wall also Former inhibitor spout central line is conllinear, and same layer is sprayed into respect to the amino reduction inhibitor agent on front-back wall in a manner of liquidating;It is reachable To preferable mixed effect;
Preferably reduction inhibitor agent delivery pipe is arranged in one kind as the present invention on the forward and backward wall of at least one side or side wall, will The reduction inhibitor agent spout is set in corresponding reduction inhibitor agent delivery pipe;Preferable mixed effect is can reach, is suitable for not Same operating mode.
One kind as the present invention preferably passing through wind turbine extraction section cigarette from back-end ductwork after or before boiler air preheater Gas mixes primary in a latter wind snout with by several turbulent burners with the amino reduction inhibitor agent and fire coal Wind sprays into burner hearth;It more conducively realizes the reducing atmosphere of burner hearth and improves conversion zone temperature;
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, and a small amount of amino reduction is avoided to inhibit Agent is aoxidized in burning;
One kind as the present invention is preferred, the reducing zone between fire air nozzle and turbulent burner and and swirl flow combustion The corresponding primary zone of device is respectively provided with purging wind snout close to the front-back wall both sides of the edge of both walls, by purging wind snout to burner hearth Purging wind is sprayed into close to side wall region, the excess air coefficient for purging wind is 0.85~0.95;It is close by purging wind direction burner hearth Side wall region supplements air, and the flue gas for avoiding the mobility of neighbouring side water wall poor forms strongly reducing atmosphere, prevents flying dust Coking forms high temperature corrosion to water-cooling wall in this atmosphere.
One kind as the present invention preferably, by each layer close to both walls turbulent burner with to 5 ° of burner hearth center-biased~ 45 ° of direction injection;Atmosphere is in strong reducing property near side wall caused by Involving velocity to alleviate this edge turbulent burner Phenomenon 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, remarkable in economical benefits are significantly reduced, and prevents water-cooling wall in stove There is high temperature corrosion, there is wide applicability.
Description of the drawings
Fig. 1 is the opposed firing boiler schematic diagram using the embodiment of the present invention one.
Fig. 2 is the end view of a turbulent burner in Fig. 1.
Fig. 3 is the front view of burner hearth front wall in Fig. 1.
Fig. 4 is the A-A sectional views of Fig. 3.
Fig. 5 is the opposed firing boiler schematic diagram using the embodiment of the present invention two.
Fig. 6 is the end view of turbulent burner in Fig. 5.
Fig. 7 is the opposed firing boiler schematic diagram using the embodiment of the present invention three.
Fig. 8 is that same layer reduction inhibitor agent spout arranges schematic diagram in Fig. 7.
Fig. 9 is the opposed firing boiler schematic diagram using the embodiment of the present invention four.
Figure 10 is that one layer of reduction inhibitor agent spout arranges schematic diagram in Fig. 9.
Figure 11 is the front view of burner hearth front wall in Fig. 9.
Figure 12 is the opposed firing boiler schematic diagram using the embodiment of the present invention five.
Figure 13 is that one layer of reduction inhibitor agent spout arranges schematic diagram in Figure 12.
Figure 14 is to arrange schematic diagram using reduction inhibitor agent spout in the embodiment of the present invention six.
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, Figure 4, the opposed firing boiler, burner hearth front wall 7,8 top of rear wall are equipped with several layers of after-flame Wind snout 4, its burner hearth front wall 7,8 lower part of rear wall are equipped with several layers, per the number of plies turbulent burner 1, are equipped in turbulent burner 1 Wind snout 2 and overfire air port 3, the center line of every layer of turbulent burner 1 close to both walls 18 is to burner hearth center-biased 5 °~45 °, the reduction wind snout between turbulent burner 1 and fire air nozzle 4 on furnace wall;Burner hearth is divided into from bottom to up and eddy flow It is reducing zone 12 between 1 corresponding primary zone 14 of burner, fire air nozzle 4 and turbulent burner 1, right with fire air nozzle 4 The burning-out zone 13 answered is respectively provided with purging in the front-back wall both sides of the edge of the close both walls 18 of burner hearth reducing zone 12 and primary zone 14 Wind snout 16 and 17, back-end ductwork is connected by wind turbine 9 and pipeline 10 with primary air piping 11 after boiler air preheater, in pipeline 10 are equipped with incorporation pipe 15;
A kind of opposed firing boiler depth denitration combustion method of the present embodiment:Pass through wind from back-end ductwork after boiler air preheater 9 extraction section flue gas of machine with from incorporation pipe 15 mix amino reduction inhibitor agent mix, then with the First air in primary air piping 11 It is sprayed into the latter wind snout 2 with several layers passed through on front wall 7, rear wall 8, the every number of plies turbulent burner 1 of coal-fired mixing Stove chamber inner combustion, and Secondary Air is sprayed by the overfire air port of turbulent burner 13, pass through several layers of after-flame on front wall 7, rear wall 8 Wind snout 4 is passed through burnout degree, and purging wind, front wall 7, rear wall are sprayed into the close side wall region of burner hearth by purging wind snout 16 and 17 First air and Secondary Air on 8 liquidate penetrating, wherein each layer close to both walls 18 turbulent burner 1 with to burner hearth center-biased 5 °~45 ° of direction injection Secondary Air and mixed First air, fire coal, partial fume and amino reduction inhibitor agent, burnout degree It can be the form of liquidating, can be configured as circle of contact form, the excess air coefficient in the primary zone 14 wherein where turbulent burner Ranging from 0.5~1.05, fire coal carries out low oxygen combustion;The excess air coefficient of burning-out zone 13 is 1.05~1.3, carries out oxygen-enriched combustion It burns;Reduction wind, the excess of reduction wind are sprayed by the reduction wind snout between turbulent burner 1 and fire air nozzle 4 on furnace wall Air coefficient is 0.6~0.85;The excess air coefficient for purging wind is 0.85~0.95;Amino reduction inhibitor agent is high in burner hearth The nitrogen oxides in flue gas is restored under warm 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 also It is blended in advance with fire coal, pipe 15 is mixed to cancel), and control excess air coefficient in lower range, herein the oxygen in flue gas It is depleted substantially, in reducing atmosphere, since conversion zone temperature is very high, does not need catalyst, amino reduction inhibits Nitrogen oxides in flue gas is strengthened reduction by agent, and inhibits the generation of nitrogen oxides in this atmosphere so that enters burning-out zone Nitrous oxides concentration substantially reduces, and uncombusted fuel is fully burned in burning-out zone, it is ensured that efficiency of combustion, it is newly generated Nitrogen oxides is limited plus the nitrogen oxides into burning-out zone, this regional temperature is still higher, can be restored and be pressed down by the amino in flue gas Preparation continues to restore so that the discharged nitrous oxides value of furnace outlet significantly reduces, and realizes minimum discharge characteristic;Pass through excessive sky Gas coefficient is that 0.85~0.95 purging wind direction burner hearth supplements air close to side wall region, avoids the mobility of neighbouring side water wall Poor flue gas forms strongly reducing atmosphere, prevents the coking in this atmosphere of the flying dust after burning from forming high temperature corrosion to water-cooling wall, In addition turbulent burner 1 to the direction of 5 °~45 ° of burner hearth center-biased to spray into fire coal, First air, Secondary Air and amino reduction Inhibitor, with alleviate this edge caused by the Involving velocity of burner near side wall atmosphere be in strong reducing property the phenomenon that, into one Step mitigates the high temperature corrosion of water-cooling wall;This method is compared to existing selective non-catalytic reduction technology(SNCR)It is urged with selectivity Change reduction technique(SCR), stringent temperature window and catalyst are not needed, denitration cost is significantly reduced, even if in stove most Under high combustion zone flue-gas temperature, it will not still lead to a large amount of oxidations of ammonia, remarkable in economical benefits, and be applicable in extensive Property.
Embodiment two
As shown in Figure 5, Figure 6, the present embodiment and embodiment one differ only in:In the primary of several turbulent burners 1 The independent reduction inhibitor agent spout 19 of setting in wind snout 2, which is located at the end of a wind snout 2 End is outer, and reduction inhibitor agent spout 19 is connected by pipeline 10 and wind turbine 9 with the back-end ductwork before air preheater, is connected on pipeline 10 There is incorporation pipe 15;When burning, it is used as amino reduction suppression from back-end ductwork after boiler air preheater by 9 extraction section flue gas of wind turbine The pumped (conveying) medium of preparation, with by mix the amino reduction inhibitor agent that pipe 15 mixes mix it is latter with from reduction inhibitor agent spout 19 Spray into burner hearth;The present embodiment is more conducive to realize the reducing atmosphere of burner hearth and improves conversion zone temperature;Compared to embodiment one, The amino reduction inhibitor agent of the present embodiment does not contact in burner with fire coal, can avoid the oxygen of a small amount of amino reduction inhibitor agent Change, denitration effect is more preferably.
Embodiment three
As shown in Figure 7, Figure 8, the present embodiment and embodiment two differ only in:Several reduction inhibitor agent spouts 20 are changed On burner hearth quadrangle and front wall 7, rear wall 8 between two layers of turbulent burner 1;When burning, sprayed by several reduction inhibitor agents Mouth 20 sprays into the amino reduction inhibitor agents, and the amino reduction inhibitor agent of same layer in burner hearth to form the side of two imaginary circles Formula sprays into;Wherein 20 aperture of reduction inhibitor agent spout is 1~10mm, is open as sector, opening angle between 10 °~150 °, For the penetrating speed of amino reduction inhibitor agent between 10m/s~400m/s, the deflection angle of adjustment reduction inhibitor agent spout 20 can To adjust tangential circle diameter size and direction of rotation, meet the needs of different operating modes;The present embodiment had both kept the good burning of burner hearth Environment, and ensure being sufficiently mixed for reducing agent and flue gas, improve denitration effect.
Example IV
As shown in Fig. 9, Figure 10, Figure 11, the present embodiment is differed only in embodiment three:It is equipped with several go back in reducing zone Former wind snout 22, by several reduction inhibitor agent spouts 21 change set on reduction wind snout 22 and fire air nozzle 4 between front wall 7, Afterwards on wall 8 and both walls 18;When burning, reduction wind is sprayed by restoring wind snout 22, the excess air coefficient of reduction wind is 0.6 ~0.85, spray into the amino reduction inhibitor agent by several reduction inhibitor agent spouts 21, the amino reduction inhibitor agent of same layer with The mode that two imaginary circles are formed in burner hearth sprays into;The present embodiment had not only kept the good burning situation of burner hearth, but also ensured ammonia Base reduction inhibitor agent and flue gas are sufficiently mixed, and improve reducing atmosphere, improve denitration effect;The combustion of the present embodiment multi-tier arrangement Wind snout 4 has the effect of preferably reducing discharged nitrous oxides to the greatest extent, therefore fire air nozzle 4 can be adjusted according to fuel characteristic Every layer of air quantity reduces the production quantity of nitrogen oxides, is advantageously implemented minimum discharge characteristic as possible to optimal proportion.
Embodiment five
As shown in Figure 12 and Figure 13, the present embodiment and embodiment three differ only in:It is equipped with several combustions again in reducing zone Expect spout 24, by several reduction inhibitor agent spouts 23 change front wall 7 between reburning fuel spout 24 and fire air nozzle 4, Afterwards on wall 8, the reduction inhibitor agent spout central line on front wall 7, rear wall 8 is conllinear;When burning, sprayed by reburning fuel spout 24 Reburning fuel sprays into the amino reduction inhibitor agent on front wall 7, rear wall 8 in a manner of liquidating;The present embodiment is suitable for using to be fired again The opposed firing boiler of technology can reach flue gas and the preferable mixed effect of amino reduction inhibitor agent;
Embodiment six
As shown in figure 14, the present embodiment and embodiment three differ only in:Setting is gone back on a face side wall of reducing zone Former inhibitor delivery pipe 25 changes the reduction inhibitor agent spout 26 in reduction inhibitor agent delivery pipe 25;When burning, from pot Back-end ductwork is used as the pumped (conveying) medium of amino reduction inhibitor agent by wind turbine extraction section flue gas after stove air preheater, with the ammonia The mixing of base reduction inhibitor agent is latter to be sprayed into from reduction inhibitor agent spout 26;Preferable mixed effect is can reach, difference is suitable for Operating mode;
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, if reduction inhibitor agent spout can also be set to reburning fuel spout in, The penetrating form of its levels of multilayer reduction inhibitor agent spout can be different, they are all belonged to the scope of protection of the present invention.

Claims (21)

1. a kind of opposed firing boiler depth denitration combustion method, by several layers on front-back wall, per the primary of the number of plies turbulent burner Fire coal is sprayed into hearth combustion by the First air in wind snout, and sprays into Secondary Air by the overfire air port of turbulent burner, is led to The fire air nozzle for crossing front-back wall last layer or more is passed through burnout degree, and the First air and Secondary Air on front-back wall liquidate penetrating, It is characterized in that:The excess air coefficient in the primary zone wherein where turbulent burner ranging from 0.5~1.05, fire coal carry out hypoxemia Burning;The excess air coefficient of burning-out zone where fire air nozzle is 1.05~1.3, carries out oxygen-enriched combusting;Also pass through eddy flow Reduction wind snout between burner and fire air nozzle on furnace wall sprays into reduction wind, and the excess air coefficient of reduction wind is 0.6 ~0.85;One layer or more of amino reduction inhibitor agent, the high temperature ring in burner hearth are sprayed into top layer's burnout degree burner hearth below The nitrogen oxides in flue gas is restored under border.
2. a kind of opposed firing boiler depth denitration combustion method according to claim 1, it is characterised in that:Also by the amino Former inhibitor is sprayed by the First air in a wind snout of several turbulent burners in burner hearth after being mixed with fire coal.
3. a kind of opposed firing boiler depth denitration combustion method according to claim 1, it is characterised in that:It is fired by top layer The independent reduction inhibitor agent spout of one layer below of wind or more sprays into the amino reduction inhibitor agent to the greatest extent, and same layer spout is located at same Horizontal plane.
4. a kind of opposed firing boiler depth denitration combustion method according to claim 3, it is characterised in that:It is several by being set to Independent reduction inhibitor agent spout sprays into the amino reduction inhibitor agent in wind snout of turbulent burner.
5. a kind of opposed firing boiler depth denitration combustion method according to claim 3, it is characterised in that:By reduction inhibitor agent Spout or reducing zone between two layers of turbulent burner or between turbulent burner and fire air nozzle are set to Between several layers of fire air nozzle.
6. a kind of opposed firing boiler depth denitration combustion method according to claim 3, it is characterised in that:By being set to reduction Described one layer or more independent reduction inhibitor agent spout between wind snout and fire air nozzle sprays into the amino reduction and inhibits Agent.
7. a kind of opposed firing boiler depth denitration combustion method according to claim 3, it is characterised in that:Also by being set to rotation It flows the reburning fuel spout between burner and fire air nozzle on front and back furnace wall and 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 the amino reduction inhibitor agent.
8. according to a kind of any opposed firing boiler depth denitration combustion method of claim 5 to 7, it is characterised in that:By institute State reduction inhibitor agent spout set on burner hearth quadrangle and it is front and back on, pass through several reduction inhibitor agent spouts and spray into amino reduction suppression The amino reduction inhibitor agent of preparation, same layer is sprayed into a manner of forming more than one imaginary circle in burner hearth.
9. according to a kind of any opposed firing boiler depth denitration combustion method of claim 5 to 7, it is characterised in that:By institute Reduction inhibitor agent spout is stated on burner hearth front-back wall and side 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 opposed firing boiler depth denitration combustion method of claim 5 to 7, it is characterised in that:By institute Reduction inhibitor agent spout is stated on burner hearth front-back wall, reduction inhibitor agent spout central line is conllinear on front-back wall, and same layer is opposite Amino reduction inhibitor agent on front-back wall is sprayed into a manner of liquidating.
11. according to a kind of any opposed firing boiler depth denitration combustion method of claim 5 to 7, it is characterised in that:Extremely Reduction inhibitor agent delivery pipe is set on few wall forward and backward on one side or side wall, the reduction inhibitor agent spout is set to corresponding reduction In inhibitor delivery pipe.
12. a kind of opposed firing boiler depth denitration combustion method according to claim 3, it is characterised in that:Also by being set to Reburning fuel spout between turbulent burner and fire air nozzle on front and back furnace wall sprays into reburning fuel, fires combustion again by being set to Expect that the reduction inhibitor agent spout in spout sprays into the amino reduction inhibitor agent.
13. a kind of opposed firing boiler depth denitration combustion method according to claim 2, it is characterised in that:It is empty pre- from boiler Back-end ductwork is mixed by wind turbine extraction section flue gas with the amino reduction inhibitor agent and fire coal latter same after or before device It is sprayed into burner hearth by the First air in a wind snout of several turbulent burners.
14. a kind of opposed firing boiler depth denitration combustion method according to claim 3 or 4 or 5 or 6 or 7 or 12, feature It is:It is used as the defeated of amino reduction inhibitor agent from back-end ductwork after or before boiler air preheater by wind turbine extraction section flue gas Send medium, mixed with the amino reduction inhibitor agent it is latter with from the reduction inhibitor agent spout spray into burner hearth.
15. a kind of opposed firing boiler depth denitration combustion method according to claim 8, 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.
16. a kind of opposed firing boiler depth 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 opposed firing boiler depth denitration combustion method according to claim 10, 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.
18. a kind of opposed firing boiler depth denitration combustion method according to claim 11, 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.
19. a kind of opposed firing boiler depth denitration combustion method according to any one of claims 1 to 7, it is characterised in that:It is firing The front-back wall of reducing zone between wind snout and turbulent burner and primary zone corresponding with turbulent burner close to both walls to the greatest extent Both sides of the edge are respectively provided with purging wind snout, spray into purging wind to the close side wall region of burner hearth by purging wind snout, purge wind Excess air coefficient is 0.85~0.95.
20. a kind of opposed firing boiler depth denitration combustion method according to claim 8, it is characterised in that:It is sprayed in burnout degree Reducing zone and primary zone corresponding with turbulent burner between mouth and turbulent burner is close to the front-back wall two sides of both walls Edge is respectively provided with purging wind snout, sprays into purging wind to the close side wall region of burner hearth by purging wind snout, purges the excessive empty of wind Gas coefficient is 0.85~0.95.
21. a kind of opposed firing boiler depth denitration combustion method according to any one of claims 1 to 7, it is characterised in that:It will be each Layer is close to the turbulent burner of both walls to be sprayed to the direction of 5 °~45 ° of burner hearth center-biased.
CN201610608059.8A 2016-07-29 2016-07-29 A kind of opposed firing boiler depth denitration combustion method Active CN106247320B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610608059.8A CN106247320B (en) 2016-07-29 2016-07-29 A kind of opposed firing boiler depth denitration combustion method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610608059.8A CN106247320B (en) 2016-07-29 2016-07-29 A kind of opposed firing boiler depth denitration combustion method

Publications (2)

Publication Number Publication Date
CN106247320A CN106247320A (en) 2016-12-21
CN106247320B true CN106247320B (en) 2018-08-24

Family

ID=57603561

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610608059.8A Active CN106247320B (en) 2016-07-29 2016-07-29 A kind of opposed firing boiler depth denitration combustion method

Country Status (1)

Country Link
CN (1) CN106247320B (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109210564A (en) * 2017-07-04 2019-01-15 上海梅山钢铁股份有限公司 Gas boiler variable working condition low oxygen combustion control method
CN107270268A (en) * 2017-07-12 2017-10-20 河南开祥精细化工有限公司 A kind of boiler smoke minimum discharge device
CN107583444A (en) * 2017-09-29 2018-01-16 东方电气集团东方锅炉股份有限公司 A kind of denitrating system and method that reduction inhibitor agent is carried using steam
CN107940446B (en) * 2017-12-08 2024-01-16 东方电气集团东方锅炉股份有限公司 Large entrainment jet flow over-fire air system and jet method
CN108266721A (en) * 2018-01-12 2018-07-10 东方电气集团东方锅炉股份有限公司 Boiler-burner arrangement
CN108679600A (en) * 2018-04-18 2018-10-19 哈尔滨理工大学 Air classification combines out of stock method with SNCR
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
CN109058979B (en) * 2018-08-13 2023-11-03 中国华能集团有限公司 Cyclone furnace denitration system and method
CN108905590B (en) * 2018-08-13 2023-05-12 中国华能集团有限公司 Denitration system and method for low-nitrogen burner of power station boiler in cooperation with high-temperature ammonia injection
CN109114588A (en) * 2018-08-31 2019-01-01 华北水利水电大学 It is pure to fire high-alkali coal wet bottom boiler low NOx combustion system and method for controlling combustion
CN109737387B (en) * 2018-12-07 2023-08-29 华电电力科学研究院有限公司 Device for preventing high-temperature corrosion of side wall water-cooled wall of opposed combustion boiler and working method
CN110274222A (en) * 2019-07-12 2019-09-24 合肥工业大学智能制造技术研究院 Burn method for arranging in a kind of opposite-flushing type oil burning boiler and its furnace
CN111550773A (en) * 2020-04-17 2020-08-18 江联重工集团股份有限公司 Large-capacity high-parameter gas boiler opposed-flushing type low-nitrogen oxide combustion power field
CN111450703B (en) * 2020-05-09 2024-05-07 中国华能集团有限公司 High-temperature ammonia spraying and denitration device for coal-fired boiler
CN113654079B (en) * 2021-08-27 2023-07-28 西安热工研究院有限公司 Combustion method for effectively reducing boiler furnace slagging and high-temperature corrosion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1387006A (en) * 2001-05-18 2002-12-25 清华大学 Method and apparatus for reducing exhaustion of nitrogen oxides from coal-fired boiler
CN101021327A (en) * 2007-02-28 2007-08-22 哈尔滨工业大学 Method of decreasing release of nitrogen oxide in the pulverized-coal fired boiler and its used boiler
CN101021316A (en) * 2007-03-14 2007-08-22 哈尔滨工业大学 Method and device of denitration utilizing biomass direct burning and re-burning as well as smoke gas recirculating technology
CN102679309A (en) * 2012-06-08 2012-09-19 哈尔滨锅炉厂有限责任公司 350MW supercritical W flame anthracite boiler
CN103104910A (en) * 2013-02-18 2013-05-15 上海锅炉厂有限公司 Micro oxygen rich combustion W flame boiler and CO2 emission reduction system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1387006A (en) * 2001-05-18 2002-12-25 清华大学 Method and apparatus for reducing exhaustion of nitrogen oxides from coal-fired boiler
CN101021327A (en) * 2007-02-28 2007-08-22 哈尔滨工业大学 Method of decreasing release of nitrogen oxide in the pulverized-coal fired boiler and its used boiler
CN101021316A (en) * 2007-03-14 2007-08-22 哈尔滨工业大学 Method and device of denitration utilizing biomass direct burning and re-burning as well as smoke gas recirculating technology
CN102679309A (en) * 2012-06-08 2012-09-19 哈尔滨锅炉厂有限责任公司 350MW supercritical W flame anthracite boiler
CN103104910A (en) * 2013-02-18 2013-05-15 上海锅炉厂有限公司 Micro oxygen rich combustion W flame boiler and CO2 emission reduction system

Also Published As

Publication number Publication date
CN106247320A (en) 2016-12-21

Similar Documents

Publication Publication Date Title
CN106247320B (en) A kind of opposed firing boiler depth denitration combustion method
CN106247321B (en) A kind of W flame boiler for deeply denitration combustion method
CN106287674B (en) A kind of tangential boiler depth denitration combustion method
KR970003606B1 (en) A clustered concentric tangential firing system
CN105020700B (en) A kind of grate firing boiler combination denitrification apparatus and method
CN102179171B (en) Multi-stage themolysis coupled denitration method using front flow field uniformizing device and device thereof
CN111450681B (en) Denitration, desulfurization and dust removal integrated system for supercritical carbon dioxide coal-fired boiler
CN107355776B (en) Combustion System of Boiler Burning Fine, method and the application of ultra-low NOx emission
CN107477573B (en) A kind of burner of the spray ammonia of the heart in the burner for industrial coal powder boiler
CN101021327A (en) Method of decreasing release of nitrogen oxide in the pulverized-coal fired boiler and its used boiler
CN107606602B (en) A kind of horizontal boiler of SNCR and OFA interlaced arrangement
WO2014067405A1 (en) Method for reducing nitrogen oxide discharge of biomass circulating fluidized bed boiler
CN106051749A (en) Low-nitrogen combustion technique based on circulating fluidized bed boiler
CN105805729A (en) Low NOx burning method and low NOx burning system
CN108434964A (en) A kind of matrix form injection apparatus for circulating fluidized bed boiler SNCR denitration system
CN103041686A (en) NOx removing device and method by means of exhaust gas recycle and ammonia agent spray
JP2004190981A (en) Combustion device and wind box
CN107559823B (en) A kind of low nitrogen combustion apparatus of denitration in the stove and two-stage over-fire wind arrangement
CN204042867U (en) A kind of low-NO_x burner system
CN106322416B (en) A kind of π moulded coals powder boiler back end ductwork NOxWith CO catalytic eliminating devices
CN205782865U (en) Realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging
CN202938291U (en) Re-combustion type double-channel low-nitrogen oxide compound pulverized coal burner
CN212005648U (en) Supercritical carbon dioxide coal-fired boiler with ammonia injection combustor
TWI435036B (en) Combustion system with low nitrogen oxides emission
CN105805730A (en) Circulating fluidized bed boiler system for achieving low nitrogen oxide discharge

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant