CN102620291A - Pulverized coal decoupling combustor with low nitrogen oxide discharge and pulverized coal decoupling combustion method with low nitrogen oxide discharge - Google Patents

Pulverized coal decoupling combustor with low nitrogen oxide discharge and pulverized coal decoupling combustion method with low nitrogen oxide discharge Download PDF

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CN102620291A
CN102620291A CN2011100338118A CN201110033811A CN102620291A CN 102620291 A CN102620291 A CN 102620291A CN 2011100338118 A CN2011100338118 A CN 2011100338118A CN 201110033811 A CN201110033811 A CN 201110033811A CN 102620291 A CN102620291 A CN 102620291A
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China
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powder
shunting
flame holder
duct
passage
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CN2011100338118A
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Chinese (zh)
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CN102620291B (en
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郝江平
高士秋
李静海
蔡连国
许光文
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中国科学院过程工程研究所
山西三合盛工业技术有限公司
北京圆能工业技术有限公司
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    • Y02E20/344

Abstract

The invention relates to a pulverized coal decoupling combustor with low nitrogen oxide discharge and a pulverized coal decoupling combustion method with low nitrogen oxide discharge. The method is implemented through the following two stages: a) stage 1, firstly separating mixed airflow of pulverized coal and air into a concentrated part and a dilute part by virtue of the pulverized coal decoupling combustor provided by the invention, igniting the concentrated pulverized coal airflow, then feeding the concentrated pulverized coal airflow into a hearth, and performing combined combustion on the concentrated pulverized coal airflow and the dilute pulverized coal airflow; and b) stage 2, mixing the mixed airflow with secondary air in the hearth, and fully combusting the pulverized coal semicoke generated in the stage 1 under conditions of rich oxygen and high temperature which is insufficient to generate thermal NOx, wherein in the stage 1, the pulverized coal is pyrolyzed, gasified and gas-fired under reducing atmosphere, volatile components are fully separated out, products of pyrolysis and gasification are utilized to convert fuel-type NOx into more stable N2. According to the invention, an integration design of pulverized coal condensation, stable combustion and low nitrogen oxide discharge can be realized, the equipment structure is compact, the pulverized coal condensation effect is good, the stable combustion capability is strong, and the potential of inhibiting NOx from generating is high.

Description

Low-nitrogen oxide discharging coal powder decoupling burning device and coal dust decoupling burning method

Technical field

The invention belongs to the coal-dust combustion device field, particularly a kind of pyrolytic gasification coal dust decoupling burning device of low-nitrogen oxide discharging and coal dust decoupling burning method.

Background technology

In the practical application of coal dust firing, along with coal air mixture in the ignition temperature of combustion phases and the raising of oxygen concentration, the content of fly ash combustible material in the flue gas (uncompleted burned carbon and CO) reduces, coal dust more is prone to fast, abundant after-flame; Simultaneously, high-temperature oxygen-enrichedly can make the NO that generates in the combustion process again xSignificantly improve; On the other hand, coal air mixture helps suppressing nitrogen oxide NO more in that the ignition temperature of combustion phases and oxygen concentration are low more xGenerate, but coal dust more is difficult for after-flame.Thereby, the fly ash combustible material and the NO of releasing coal dust firing xThe coupling emission problem be long-standing technological difficulties on the combustion technology.

At present, the low NO that is applicable to pulverized coal firing boiler that has developed xCombustion technology mainly contains air classification combustion technology, fuel-staged combustion technology, flue gas recirculation combustion technology etc.Because aforesaid coupling discharging relation, these several kinds technology often can only stress the solution of an aspect problem, not only can not deal with problems up hill and dale, also bring many other problems simultaneously.For example the air classification combustion technology reduces NO xEfficient lower, simultaneously delayed in the stage of oxygen-enriched combusting, cause the content of fly ash combustible material to increase, and in the burner hearth on a large scale reducing atmosphere also make the high temperature corrosion probability of burner hearth coking and water-cooling wall increase greatly; The fuel-staged combustion technology only when using combustion gas and light oil etc. with the hydrocarbon compound to be master's secondary fuel, just has higher NO xReduction efficiency and maintenance are than high burning efficiency, but this scheme sharply increases fuel cost, equipment investment and maintenance cost, so domestic application is less.The flue gas recirculation combustion technology reduces NO xLower, equipment investment of efficient and operation and maintenance cost higher, also can increase the content of fly ash combustible material in the flue gas simultaneously, reduce boiler efficiency, this scheme seldom adopts now.

The coal dust low NO of having developed at present adopts the mode of Pulverized Coal Concentration after-combustion more, can reduce NO to a certain extent xDischarging; But because thickening efficiency is not high, the A/C (ratio of air quality and quality of pc) of the thick coal culm air-flow after concentrating is many between 0.8~1.3, particularly is lower than 10%~20% coal for volatile matter; Air capacity during this air-flow coal dust firing still is higher than or near the required air capacity of volatile combustion in the coal; The gas-phase reaction rapid speed of volatile matter and oxygen, thereby this burning condition will inevitably make and a large amount of and combination with oxygen of nitrogen that pyrolysis goes out in the coal changes into NO xThe NO that has generated xThough can be through the supply process of control air; Make it to utilize semicoke in reducing atmosphere, to burn and come partial reduction; The solid reaction rate restriction but this heterogeneous reaction is bullied; This stage is that master's reducing agent reactivity is lower with C, CO etc., after air-flow gets into furnace cavity and enlarges, and reducing agent diffusion velocity and and NO xContact probability extremely low, thereby reduction reaction is difficult to abundant completion in burner hearth, reduces NO xThe efficient of discharging is lower.

The decoupling burning technology can realize removing the fly ash combustible material and the NO of coal burning xCoupling discharging relation, be to reduce fly ash combustible material and NO simultaneously xThe effective ways of discharging.Its mechanism is: the coal burning process is divided into two stages, and the phase I, pyrolysis, gasification and gas-fired take place in coal under very high reducing atmosphere, and the pyrolysis and the gasification product that utilize coal self are with fuel type NO xBe converted into more stable N 2Second stage is created high-temperature oxygen-enriched but is not produced heating power type NO xEnvironment, guarantee the abundant after-flame of coal again; This stage is reduced NO xMainly be to utilize semicoke self aptitude to burn.

This shows that decoupling burning suppresses NO xThe critical process of discharging; The conversion process of the fugitive constituent nitrogen that produces at burning initial stage pyrolytic gasification; This process mainly less spatial dimension before wind inside, a secondary wind are mixed is carried out; Wind with promptly begin the after-flame stage, the reducing atmosphere of burner hearth on a large scale that does not need aforesaid air classification burning to produce after secondary wind is mixed.This process also is equivalent to the fractional combustion on the microcosmic, and just mechanism is different from the air classification burning on the aforesaid macroscopic view, and the reducing agent of decoupling burning more is the pyrolytic gasification product, and reactivity is higher.

At present, people reduce NO to decoupling burning xMechanism further investigate; And a series of patents of layered decoupling combustion furnace have appearred being applicable to, like a kind of smokeless coal-burning method that suppresses nitrogen oxide and coal furnace (Chinese invention patent number: ZL95102081.1), realize multiaspect stereo burning stove and the combustion method thereof (Chinese invention patent number: ZL200410098603.6) etc. of coal clean burning.Yet, in above-mentioned these patents, all only be suitable for the layer combustion technology, be only applicable to the middle-size and small-size decoupling burning stove below the 20 tons/h, be difficult to realize that the decoupling burning stove of coal dust firing maximizes.

Summary of the invention

Therefore, the objective of the invention is to overcome the defective of prior art, thereby a kind of method that can be used for the coal dust decoupling burning is provided.Another object of the present invention provides a kind of coal dust decoupling burning device.

The coal dust decoupling burning device of low-nitrogen oxide discharging provided by the invention, to shown in Figure 7, it is made up of burner body and the burner nozzle that is communicated in said burner body front port like Fig. 1;

Described burner nozzle by spout shell body 1, secondary varying cross-section duct 6, one-level varying cross-section duct 7, left side wind coaming plate 8, right edge wind coaming plate 11, interior left gusset 9, interior right web plate 10, on collect powder shunting flame holder 2 and next part powder shunting flame holder 3 is formed;

Said secondary varying cross-section duct 6 securely is connected in said spout shell body 1 front port successively with said one-level varying cross-section duct 7; The edge is by the airflow direction behind the forward direction, and said one-level varying cross-section duct 7 is cross sectional shape continually varying varying cross-section duct with secondary varying cross-section duct 6; The left and right sides face of said secondary varying cross-section duct 6 is relatively outward-dipping; The left and right sides face of said one-level varying cross-section duct 7 relatively slopes inwardly, and the two sides up and down of said one-level varying cross-section duct 7 are relatively outward-dipping; Said one-level varying cross-section duct 7 is identical with said secondary varying cross-section duct 6 connection sectional dimensions and be fastenedly connected; Said left side wind coaming plate 8 lays respectively at the left and right sides outside the said spout shell body 1 with said right edge wind coaming plate 11; Said left side wind coaming plate 8 links to each other with the said spout shell body 1 left surface outside and surrounds the left side air channel f1 that front and back connect; Said right edge wind coaming plate 11 links to each other with the said spout shell body 1 right flank outside and surrounds the right edge air channel f2 that front and back connect;

Be respectively equipped with the left side wind controllable register 4 and right edge wind controllable register 5 of vertical placement within the said left-external side passage f1 with within the right outer passage f2;

Said left inner reinforced plate 9 lays respectively at the left and right sides within the said spout shell body 1 with said right inner reinforced plate 10; Said left inner reinforced plate 9 and the inboard left light powder passage g1 that links to each other and surround the front and back perforation of said spout shell body 1 left surface; Said right inner reinforced plate 10 and the inboard right light powder passage g2 that links to each other and surround the front and back perforation of said spout shell body 1 right flank; Said left inner reinforced plate 9 rear ends and right inner reinforced plate 10 rear ends all are positioned at said spout shell body 1 rear end face side before;

Described upward collection powder shunting flame holder 2 and described next part powder shunting flame holder 3 lay respectively between the both sides up and down and said left inner reinforced plate 9 and right inner reinforced plate 10 within the said spout shell body 1; Said upward collection powder shunting flame holder 2 is the diminishing from top to bottom step-like structure of cross section; Said next part powder shunting flame holder 3 be the diminishing from the bottom to top step-like structure of cross section, and the small bore end face of two step-like structures is relative and leave the space;

The said collection powder shunting both sides, flame holder 2 upper end of going up are fixedly linked with said left inner reinforced plate 9 upper ends and right inner reinforced plate 10 upper ends respectively; Said next part powder shunting both sides, flame holder 3 lower end are fixedly linked with said left inner reinforced plate 9 lower ends and right inner reinforced plate 10 lower ends respectively; Said upward collection powder shunting flame holder 2 front ends and said next part powder shunting flame holder 3 front ends extend to said secondary varying cross-section duct 6 and one-level varying cross-section duct 7 intersections respectively;

The last light powder passage a1 of perforation before and after said upward collection powder shunting flame holder 2 upper sides and said spout shell body 1 upper side inboard, said spout shell body 1 left surface inner top side side and right flank inner top side side are encircled into; The following light powder passage a2 that connects before and after said next part powder shunting flame holder 2 downsides and said spout shell body 1 downside inboard, left surface inside lower end side and right flank inside lower end side are encircled into; Said upward collection powder shunting flame holder 2 rear ends and next part powder shunting flame holder 3 rear ends all flush with said left inner reinforced plate 9 rear end faces and right inner reinforced plate 10 rear end faces;

The said said next part powder of going up collection powder shunting flame holder 2 and step-like structure of step-like structure is shunted between the flame holder 3 and is left intermediate space; The part that this intermediate space is positioned at one-level varying cross-section duct 7 is one-level shunting zone e; The part that this intermediate space is positioned at secondary varying cross-section duct 6 is the preceding b1 of powder-collecting chamber; The remainder of this intermediate space is the back b2 of powder-collecting chamber; The b2 of powder-collecting chamber left side is separated with left light powder passage g1 by left inner reinforced plate 9, and powder-collecting chamber b2 right side is separated with right light powder passage g2 by right inner reinforced plate 10; Said secondary varying cross-section duct 6, saidly go up collection powder shunting flame holder 2 left surfaces and next part powder to shunt the space that flame holder 3 left surfaces surround be the second from left level shunting zone h1; Said secondary varying cross-section duct 6, saidly go up collection powder shunting flame holder 2 right flanks and next part powder to shunt the space that flame holder 3 right flanks surround be right secondary shunting zone h2; All be connected above the second from left level shunting zone h1 He above the right secondary shunting zone h2 with last light powder passage a1, below the second from left level shunting zone h1 with right secondary shunting zone h2 below all be connected with time light powder passage a2; About the second from left level shunting zone h1 about inboard and right secondary shunting zone h2 the inboard be connected with the b1 of powder-collecting chamber respectively; The second from left level shunting zone h1 back is connected with a left side light powder passage g1, and right secondary shunting zone h2 back is connected with the right side light powder passage g2;

The space of going up collection powder shunting flame holder 2 rear ends that said spout shell body 1 rear portion surrounds in the space is last smoke backflow district c1; The space that said spout shell body 1 rear portion surrounds next part powder shunting flame holder 3 rear ends in the space is following smoke backflow district c2; Said upward smoke backflow district c1 and said space between the smoke backflow district c2 down are dense powder flow area d; Other space that said spout shell body 1 rear portion surrounds in the space is the light powder flow area of the light powder outflow of last light powder passage a1, following light powder passage a2, left light powder passage g1 and right light powder passage g2; The said smoke backflow district c1 left side anterior with following smoke backflow district c2 and dense powder flow area d of going up is separated with left light powder passage g1 by left inner reinforced plate 9, and the right side is separated with right light powder passage g2 by right inner reinforced plate 10.The anterior upside of last smoke backflow district c1 separates with last light powder passage a1 through last collection powder shunting flame holder 2; The anterior downside of following smoke backflow district c2 separates with following light powder passage a2 through next part powder shunting flame holder 3.

The coal dust decoupling burning method of low-nitrogen oxide discharging provided by the invention, it is:

A wind wind powder mixture at first gets into the one-level shunting zone e of decoupling burning device spout; Laterally shrink gradually at one-level varying cross-section duct 7 sidewalls; Go up in the next space of amplifying gradually; Be subjected to wind wind powder mixtures of a guide effect part of one-level varying cross-section duct 7 sidewalls current downflow that makes progress, get into respectively and go up light powder passage a1 and light powder passage a2 down; Because the density of coal dust is bigger than air; Effect of inertia makes the most of b1 of powder-collecting chamber of entering of coal dust; Airflow flowing is taken light powder passage a1 and following light powder passage a2 to about having only few part coal dust quilt, and gets into the burner hearth of decoupling burning device thus, thereby realizes the deep or light separation of the wind powder mixture first order; The air quality of a wind wind powder mixture that is concentrated and the ratio of quality of pc are reduced to 0.6~1.8 by original 1.0~3.0, and coal powder density increases;

After this wind powder mixture that is concentrated gets into the preceding b1 of powder-collecting chamber; Owing to be subjected to collecting the extruding influence in space between the powder shunting flame holder 2 and 3; Portion of air gets into left light powder passage g1 and right light powder passage g2 respectively to two side flow, because the effect of inertia of coal dust makes its most of back b2 of powder-collecting chamber that gets into; Have only few part to be taken to left light powder passage g1 and right light powder passage g2 by left and right sides airflow flowing; And get into the burner hearth of decoupling burning device thus, thereby realize the partial deep or light separation of wind powder mixture, the wind powder mixture that is concentrated air quality and the ratio of quality of pc further be reduced to 0.3~1.2;

Under the staged convex edge effect of last collection powder shunting flame holder 2 and next part powder shunting flame holder 3; The middle part of the concentrated breeze airflow of the b2 of powder-collecting chamber after getting into is because the space is narrower and small; The portion of air at middle part makes the coal powder density at air-flow middle part further increase to two side flow; Because the b2 of powder-collecting chamber flows to the effect of entrainmenting of going up bottom of the dense powder air-flow of burner hearth from the back; Make the high-temperature flue gas in the burner hearth constantly flow to the burner nozzle direction; And entrainment into dense powder flow area d from last smoke backflow district c1 and following smoke backflow district c2; Make the temperature of mixed airflow raise fast, catch fire rapidly, realize the fast pyrogenation gasification of coal dust;

Along with this dense powder air-flow flows in the burner burner hearth; This dense powder air-flow in time mixes with the light powder air-flow of aforementioned light powder flow area; Under the effect of the combustion heat and the hot flue gas of high temperature reflux; Sidepiece is sneaked into air-flow and is heated to ignition temperature in succession, remains the pyrolytic gasification of coal dust fast, makes in the coal fugitive constituent fully separate out and burn; Unburnt semicoke in time mixes with adjacent secondary wind in the burner hearth of decoupling burning device and burns away, and sufficient oxygen in time mixes in the high-temperature region with the coal dust semicoke can guarantee its abundant after-flame; Through catching fire step by step from inside to outside, the mode that oxygen is supplied with is step by step accomplished elder generation in the process of after-flame under high temperature oxidation stability atmosphere again of burning under the low-temperature reduction property atmosphere, realizes reducing simultaneously the decoupling burning of NOx and combustible discharging like this.

The coal dust decoupling burning device of low-nitrogen oxide discharging provided by the invention and the outstanding feature of combustion method:

1, through the compound action of collection powder shunting flame holder and varying cross-section duct, utilized the conversion of airflow static pressure energy, made a pulverized coal flow and the air stream nature in the wind wind powder mixed airflow be split into dense powder air-flow and light powder air-flow; Because deep or light separation is carried out from the periphery gamut of air-flow; It is long not only to separate circumference; Also can make the air-flow steering angle little, to reduce turbulent flow and eddy current, through the form of two-stage or plural serial stage separation; Can meet or exceed the Pulverized Coal Concentration efficient of cyclone separator, equipment pressure drop and wearing and tearing are then much smaller than cyclone separator;

2, the burner nozzle design space that will entrainment thermal flue gas back stream extends in the burner nozzle from hearth combustor; It is the time of burning on the one hand under the reducing atmosphere that prolongs the decoupling burning initial stage; Increase the interval that secondary wind is mixed in wind wind powder mixture air-flow and the burner hearth, with the generation of reduction NOx; On the other hand; The space of entrainmenting of a wind increases and shifts to an earlier date; Can strengthen the backflow campaign of elevated temperature heat flue gas in the burner hearth, keep near the higher temperature levels combustion zone, help carrying out fast of decoupling burning; Decoupling burning can improve near the temperature in combustion zone conversely again fast, forms benign cycle.The decoupling burning initial stage is under very high coal powder density (A/C is 0.2~1.0), to carry out, and for low-volatite coal such as anthracites, dense powder concentration is high more good more, promptly helps steady combustion, also helps suppressing the generation of NOx; For bituminous coal of high volatile etc.; The generation of steady combustion and inhibition NOx is easier to; But initial decoupling burning is too strong easily, and the content that the coal powder density height can be controlled the agent of burning initial oxidation is lower than the stoichiometric ratio that volatile combustion reacts, and the exothermic oxidation reaction of burning also is accompanied by the endothermic reaction of pyrolysis and gasification simultaneously; Gas flow temperature is also not really high, thereby this helps being avoided the scaling loss and the coking of burner nozzle.

3, two collection powder shunting flame holder positioned opposite form concentrated breeze airflow and entrainment heating in both sides up and down, and the firing rate and the degree of depth significantly improve; Two relative sides of collection powder shuntings flame holder are designed to middle ware apart from the staged convex edge little, that the both sides spacing is big at a distance of nearest position, increased concentrated breeze airflow up and down both sides entrainment surface area, increased the ability of entrainmenting greatly; It is maximum that the backflow space is entrainmented in the middle part, makes the thermal flue gas back flow of dense powder air-flow mid portion unit breeze airflow amount maximum; Simultaneously, the stroke of middle part coal dust air Mixture stream is the longest, and it is maximum that air is squeezed, thereby coal powder density is maximum, and correspondingly the both sides coal powder density is minimum; Because channel resistance is different with flow process length; Add fluid and flow through the effect of convergent jet pipe; The flow velocity of the dense powder air-flow of burner is greater than light powder air-flow; Dense powder air-flow unit breeze airflow amount to entrainment carrying capacity higher, and the flow velocity of dense powder air-flow middle part breeze airflow is the highest, it is also the highest to entrainment carrying capacity; Collect powder shunting flame holder because most of coal dust is washed into, absolute velocity reduces, and forms the big sliding velocity that flows with air, can significantly improve the heat and mass ability of the two; The staged convex edge that two collection powder of positioned opposite are shunted flame holders makes thick coal culm air flow rate, Pulverized Coal Concentration rate, mean flow rate, the relative sliding velocity of coal dust, entrainments the backflow space and also is the staged distribution to two sidewind heat and mass speed, and the breeze airflow MAF is minimum in the middle part of reaching, coal powder density is the highest, mean flow rate is the highest, the coal dust sliding velocity is maximum, entrainment backflow space maximum and the slowest to two sidewind heat and mass speed.Because the ignition temperature of middle part breeze airflow is minimum, ignition heat is minimum, flame propagation velocity is the fastest; And the heating efficiency of entrainmenting hot flue gas is the strongest, and it is the slowest to dispel the heat, thereby the mid portion of dense powder air-flow can be easy to be heated to ignition temperature; Stable ignition burning at first; Under the effect of the combustion heat and the hot flue gas of high temperature reflux, light on every side powder air-flow is heated to ignition temperature in succession, catches fire step by step from inside to outside subsequently.

4, from the middle part to the periphery, the concentration of breeze airflow forms by dense thin out certain distribution, can strengthen the adaptability of burner structure to coal; By the center firing coal-dust, flame is progressively extended laterally, along with the enhancing of burning; Coke takes fire, and the oxygen amount is just corresponding to increase this combustion system gradually; Not only favourable to reducing NOx, also can make outside ignition point away from burner, avoid the scaling loss and the interior coking of burner of burner.

5, the mode that adopts high concentration pulverized coal air-flow upper and lower sides to entrainment high-temperature flue gas simultaneously; Can make breeze airflow quick fire burns; The further violent heating air flow of reaction heat after the breeze airflow burning can make dense gas flow temperature be elevated to 700~1200 ℃ of high temperature rapidly, coal dust generation fast pyrogenation, gasification; Volatile matter nitrogen ratio significantly improves, and oxygen concentration reduces rapidly.The combustion reaction of the volatile matter that pyrolytic gasification goes out, the overwhelming majority is a gas-phase reaction fast, accomplishes major part before dense powder air-flow is mixed with light powder air-flow to have separated out the burning of volatile matter under the oxygen deprivation environment.Because NH in the volatile matter after coal pyrolytic gasified 3, NCH, C mH nThe strong reducing property of (hydrocarbon), CO, the NO that this stage volatile matter nitrogen oxidation generates xMajor part has changed into stable N 2Behind the volatile combustion of dense powder air-flow, progressively mix with light powder air-flow, coke burns in succession in the coal dust; Consumption to oxygen increases; Cause light powder air-flow still to be under the oxygen deprivation environment with dense powder air-flow mixing after-combustion, until with after secondary wind is mixed, the condition of combustion with meagre oxygen just changes to some extent.But because most of volatile burnt, and coke nitrogen at first passes carbon grain surface reducing atmosphere layer when separating out, and receive the catalytic reduction effect of coke simultaneously, thereby coke nitrogen is converted into NO xRatio very low.Burner combustion is accomplished N earlier 2Conversion after, can in time replenish secondary wind, let coal dust that high-temperature oxygen-enriched reaction takes place early, prolong in the clean-burning time of burner hearth, thereby abundant after-flame reduces the content of fly ash combustible material, CO in the flue gas.From the above mentioned, this combustion system has been removed fly ash combustible material, CO and the NO of coal dust firing xThe coupling emission problem, realized the decoupling burning that the two discharging reduces simultaneously.

6, dense powder air-flow is in the centre, and light powder air-flow is enclosed in an outer week, not only strengthened the surface area that wind entrainments high-temperature flue gas, helps burner and surely fires, reduces NO xGeneration, can form the wall membrane type cooling of burner housing again, avoid burner scaling loss and burner coking, help again also simultaneously preventing that the coal dust segregation breaks away from air-flow, and the increase ash content carbon; Dense powder air-flow and furnace wall are isolated through light powder air-flow at back-fire side, can reduce near the reducing atmosphere of water-cooling wall, help reducing the generation of furnace water cooling wall high-temperature corrosion and coking.

7, this burner adaptability is strong.Through changing project organization, size and the relative spacing of collection powder shunting flame holder, can change design parameters such as breeze airflow concentration, flow velocity, with boiler and the coal characteristic that adapts to different designs.Regulate the side air quantity through being adjusted in the warm oneself in front of a fire side wind controllable register 5 of side (towards high temperature one side at burner hearth center) of burner; Can be according to the variation of burning conditions such as ature of coal and boiler load; Regulate near the environment temperature of burner hearth burner; Avoid taking place combustion instability or burner scaling loss, remain burner and be in optimal combustion state; Regulate near the also flue gas oxygen content of scalable burner hearth burner of side wind controllable register 5; Thereby regulate and the A/C ratio that entrainments the mixed dense powder air-flow of hot flue gas; The coal that volatile matter is high is prone to light; The oxygen demand of the pyrolytic gasification process at decoupling burning initial stage is also high, thereby can increase the side air quantity, and vice versa.

Side wind controllable register 4 through being adjusted in burner back-fire side (towards low temperature one side of furnace wall cooling) is regulated the side air quantity; Can adapt to the variation of ature of coal; Regulate and reduce near the reducing atmosphere of water-cooling wall, reduce the generation of furnace water cooling wall high-temperature corrosion and coking.

The air feed of side wind air channel f1 and side wind air channel f2 can be from the secondary wind of boiler combustion system, and two baffle plates also can be installed on the special-purpose air channel of this secondary wind, carry out unified control; The air feed of side wind also can be from a wind through the light powder pipeline after the deep or light separation; With average oxygen content, reduction side wind wind-warm syndrome (less air quantity can be protected not overtemperature of burner wall) that reduces burner nozzle and the disturbance of avoiding secondary wind, help difficult coal-fired burning.

The aperture of side windshield plate can lean on the wall temperature value of recirculating zone side to control automatically based on the steady device of collection powder shunting flame.Collection powder shunting flame holder leans on the wall temperature of recirculating zone side can reflect the height of recirculating zone temperature; The height of recirculating zone temperature can reflect the environment temperature of burner, thus set one make burning reach optimum state (this state can make burner environment temperature optimum, can realize best decoupling burning effect; Can avoid the scaling loss or the coking of burner again) the rational temperature set-point; Lean on the wall temperature value of recirculating zone side to compare with the collection powder shunting flame holder of actual measurement, its deviate is handled through controller, and the instruction of side windshield plate aperture is regulated in output; With adjusting side air quantity, thereby environment temperature is all the time in desirable scope near the control burner.

8, burner of the present invention, compact equipment, collection powder shunting flame holder had both played the effect of Pulverized Coal Concentration, also played the effect of smooth combustion, and Pulverized Coal Concentration can reduce with steady combustion integrated design to be made and installation cost.

Description of drawings

Fig. 1 is the structural representation of burner nozzle in the coal dust decoupling burning device of low-nitrogen oxide discharging of the present invention;

Fig. 2 is a structural representation of opening the burner nozzle of burner nozzle epipleural;

Fig. 3 is a structural representation of opening the burner nozzle of burner nozzle right plate;

Fig. 4 is a structural representation of opening the burner nozzle of burner nozzle epipleural and right plate;

Fig. 5 is the front view of Fig. 1;

Fig. 6 is the vertical view of Fig. 1;

Fig. 7 is the left view of Fig. 1.

The specific embodiment

Further describe the present invention below in conjunction with accompanying drawing and embodiment

Fig. 1 is the structural representation of burner nozzle in the coal dust decoupling burning device of low-nitrogen oxide discharging of the present invention; Fig. 2 is a structural representation of opening the burner nozzle of burner nozzle epipleural; Fig. 3 is a structural representation of opening the burner nozzle of burner nozzle right plate; Fig. 4 is a structural representation of opening the burner nozzle of burner nozzle epipleural and right plate; Fig. 5 is the front view of Fig. 1; Fig. 6 is the vertical view of Fig. 1; Fig. 7 is the left view of Fig. 1.Can know by figure, the coal dust decoupling burning device of low-nitrogen oxide discharging of the present invention, it is made up of burner body and the burner nozzle that is communicated in said burner body front port;

Described burner nozzle by spout shell body 1, secondary varying cross-section duct 6, one-level varying cross-section duct 7, left side wind coaming plate 8, right edge wind coaming plate 11, interior left gusset 9, interior right web plate 10, on collect powder shunting flame holder 2 and next part powder shunting flame holder 3 is formed;

Said secondary varying cross-section duct 6 securely is connected in said spout shell body 1 front port successively with said one-level varying cross-section duct 7; The edge is by the airflow direction behind the forward direction, and said one-level varying cross-section duct 7 is cross sectional shape continually varying varying cross-section duct with secondary varying cross-section duct 6; The left and right sides face of said secondary varying cross-section duct 6 is relatively outward-dipping; The left and right sides face of said one-level varying cross-section duct 7 relatively slopes inwardly, and the two sides up and down of said one-level varying cross-section duct 7 are relatively outward-dipping; Said one-level varying cross-section duct 7 is identical with said secondary varying cross-section duct 6 connection sectional dimensions and be fastenedly connected; Said left side wind coaming plate 8 lays respectively at the left and right sides outside the said spout shell body 1 with said right edge wind coaming plate 11; Said left side wind coaming plate 8 links to each other with the said spout shell body 1 left surface outside and surrounds the left side air channel f1 that front and back connect; Said right edge wind coaming plate 11 links to each other with the said spout shell body 1 right flank outside and surrounds the right edge air channel f2 that front and back connect;

Be respectively equipped with the left side wind controllable register 4 and right edge wind controllable register 5 of vertical placement within the said left-external side passage f1 with within the right outer passage f2;

Said left inner reinforced plate 9 lays respectively at the left and right sides within the said spout shell body 1 with said right inner reinforced plate 10; Said left inner reinforced plate 9 and the inboard left light powder passage g1 that links to each other and surround the front and back perforation of said spout shell body 1 left surface; Said right inner reinforced plate 10 and the inboard right light powder passage g2 that links to each other and surround the front and back perforation of said spout shell body 1 right flank; Said left inner reinforced plate 9 rear ends and right inner reinforced plate 10 rear ends all are positioned at said spout shell body 1 rear end face side before;

Described upward collection powder shunting flame holder 2 and described next part powder shunting flame holder 3 lay respectively between the both sides up and down and said left inner reinforced plate 9 and right inner reinforced plate 10 within the said spout shell body 1; Said upward collection powder shunting flame holder 2 is the diminishing from top to bottom step-like structure of cross section; Said next part powder shunting flame holder 3 be the diminishing from the bottom to top step-like structure of cross section, and the small bore end face of two step-like structures is relative and leave the space;

The said collection powder shunting both sides, flame holder 2 upper end of going up are fixedly linked with said left inner reinforced plate 9 upper ends and right inner reinforced plate 10 upper ends respectively; Said next part powder shunting both sides, flame holder 3 lower end are fixedly linked with said left inner reinforced plate 9 lower ends and right inner reinforced plate 10 lower ends respectively; Said upward collection powder shunting flame holder 2 front ends and said next part powder shunting flame holder 3 front ends extend to said secondary varying cross-section duct 6 and one-level varying cross-section duct 7 intersections respectively;

The last light powder passage a1 of perforation before and after said upward collection powder shunting flame holder 2 upper sides and said spout shell body 1 upper side inboard, said spout shell body 1 left surface inner top side side and right flank inner top side side are encircled into; The following light powder passage a2 that connects before and after said next part powder shunting flame holder 2 downsides and said spout shell body 1 downside inboard, left surface inside lower end side and right flank inside lower end side are encircled into; Said upward collection powder shunting flame holder 2 rear ends and next part powder shunting flame holder 3 rear ends all flush with said left inner reinforced plate 9 rear end faces and right inner reinforced plate 10 rear end faces;

The said said next part powder of going up collection powder shunting flame holder 2 and step-like structure of step-like structure is shunted between the flame holder 3 and is left intermediate space; The part that this intermediate space is positioned at one-level varying cross-section duct 7 is one-level shunting zone e; The part that this intermediate space is positioned at secondary varying cross-section duct 6 is the preceding b1 of powder-collecting chamber; The remainder of this intermediate space is the back b2 of powder-collecting chamber; The b2 of powder-collecting chamber left side is separated with left light powder passage g1 by left inner reinforced plate 9, and powder-collecting chamber b2 right side is separated with right light powder passage g2 by right inner reinforced plate 10; Said secondary varying cross-section duct 6, saidly go up collection powder shunting flame holder 2 left surfaces and next part powder to shunt the space that flame holder 3 left surfaces surround be the second from left level shunting zone h1; Said secondary varying cross-section duct 6, saidly go up collection powder shunting flame holder 2 right flanks and next part powder to shunt the space that flame holder 3 right flanks surround be right secondary shunting zone h2; All be connected above the second from left level shunting zone h1 He above the right secondary shunting zone h2 with last light powder passage a1, below the second from left level shunting zone h1 with right secondary shunting zone h2 below all be connected with time light powder passage a2; About the second from left level shunting zone h1 about inboard and right secondary shunting zone h2 the inboard be connected with the b1 of powder-collecting chamber respectively; The second from left level shunting zone h1 back is connected with a left side light powder passage g1, and right secondary shunting zone h2 back is connected with the right side light powder passage g2;

The space of going up collection powder shunting flame holder 2 rear ends that said spout shell body 1 rear portion surrounds in the space is last smoke backflow district c1; The space that said spout shell body 1 rear portion surrounds next part powder shunting flame holder 3 rear ends in the space is following smoke backflow district c2; Said upward smoke backflow district c1 and said space between the smoke backflow district c2 down are dense powder flow area d; Other space that said spout shell body 1 rear portion surrounds in the space is the light powder flow area of the light powder outflow of last light powder passage a1, following light powder passage a2, left light powder passage g1 and right light powder passage g2; The said smoke backflow district c1 left side anterior with following smoke backflow district c2 and dense powder flow area d of going up is separated with left light powder passage g1 by left inner reinforced plate 9, and the right side is separated with right light powder passage g2 by right inner reinforced plate 10.The anterior upside of last smoke backflow district c1 separates with last light powder passage a1 through last collection powder shunting flame holder 2; The anterior downside of following smoke backflow district c2 separates with following light powder passage a2 through next part powder shunting flame holder 3.

The coal dust decoupling burning of low-nitrogen oxide discharging of the present invention is: a wind wind powder mixture at first gets into the one-level shunting zone e of decoupling burning device spout; Laterally shrink gradually at one-level varying cross-section duct 7 sidewalls; Go up in the next space of amplifying gradually; Be subjected to wind wind powder mixtures of a guide effect part of one-level varying cross-section duct 7 sidewalls current downflow that makes progress, get into respectively and go up light powder passage a1 and light powder passage a2 down; Because the density of coal dust is bigger than air; Effect of inertia makes the most of b1 of powder-collecting chamber of entering of coal dust; Airflow flowing is taken light powder passage a1 and following light powder passage a2 to about having only few part coal dust quilt, and gets into the burner hearth of decoupling burning device thus, thereby realizes the deep or light separation of the wind powder mixture first order; The air quality of a wind wind powder mixture that is concentrated and the ratio of quality of pc are reduced to 0.6~1.8 by original 1.0~3.0, and coal powder density increases;

After this wind powder mixture that is concentrated gets into the preceding b1 of powder-collecting chamber; Owing to be subjected to collecting the extruding influence in space between the powder shunting flame holder 2 and 3; Portion of air gets into left light powder passage g1 and right light powder passage g2 respectively to two side flow, because the effect of inertia of coal dust makes its most of back b2 of powder-collecting chamber that gets into; Have only few part to be taken to left light powder passage g1 and right light powder passage g2 by left and right sides airflow flowing; And get into the burner hearth of decoupling burning device thus, thereby realize the partial deep or light separation of wind powder mixture, the wind powder mixture that is concentrated air quality and the ratio of quality of pc further be reduced to 0.3~1.2;

Under the staged convex edge effect of last collection powder shunting flame holder 2 and next part powder shunting flame holder 3; The middle part of the concentrated breeze airflow of the b2 of powder-collecting chamber after getting into is because the space is narrower and small; The portion of air at middle part makes the coal powder density at air-flow middle part further increase to two side flow; Because the b2 of powder-collecting chamber flows to the effect of entrainmenting of going up bottom of the dense powder air-flow of burner hearth from the back; Make the high-temperature flue gas in the burner hearth constantly flow to the burner nozzle direction; And entrainment into dense powder flow area d from last smoke backflow district c1 and following smoke backflow district c2; Make the temperature of mixed airflow raise fast, catch fire rapidly, realize the fast pyrogenation gasification of coal dust;

Along with this dense powder air-flow flows in the burner burner hearth; This dense powder air-flow in time mixes with the light powder air-flow of aforementioned light powder flow area; Under the effect of the combustion heat and the hot flue gas of high temperature reflux; Sidepiece is sneaked into air-flow and is heated to ignition temperature in succession, remains the pyrolytic gasification of coal dust fast, makes in the coal fugitive constituent fully separate out and burn;

Unburnt semicoke in time mixes with adjacent secondary wind in the burner hearth of decoupling burning device and burns away, and sufficient oxygen in time mixes in the high-temperature region with the coal dust semicoke can guarantee its abundant after-flame; Through catching fire step by step from inside to outside, the mode that oxygen is supplied with is step by step accomplished elder generation in the process of after-flame under high temperature oxidation stability atmosphere again of burning under the low-temperature reduction property atmosphere, realizes reducing simultaneously the decoupling burning of NOx and combustible discharging like this.

Claims (2)

1. the coal dust decoupling burning device of a low-nitrogen oxide discharging, it is made up of burner body and the burner nozzle that is communicated in said burner body front port;
Described burner nozzle by spout shell body (1), secondary varying cross-section duct (6), one-level varying cross-section duct (7), left side wind coaming plate (8), right edge wind coaming plate (11), interior left gusset (9), interior right web plate (10), on collect powder shunting flame holder (2) and shunt flame holder (3) with the next part powder and form;
Said secondary varying cross-section duct (6) and said one-level varying cross-section duct (7) securely are connected in said spout shell body (1) front port successively; The edge is by the airflow direction behind the forward direction, and said one-level varying cross-section duct (7) and secondary varying cross-section duct (6) are cross sectional shape continually varying varying cross-section duct; The left and right sides face of said secondary varying cross-section duct (6) is relatively outward-dipping; The left and right sides face of said one-level varying cross-section duct (7) relatively slopes inwardly, and the two sides up and down of said one-level varying cross-section duct (7) are relatively outward-dipping; Said one-level varying cross-section duct (7) is identical with said secondary varying cross-section duct (6) connection sectional dimension and be fastenedly connected; Said left side wind coaming plate (8) and said right edge wind coaming plate (11) lay respectively at the left and right sides outside the said spout shell body (1); Said left side wind coaming plate (8) links to each other with said spout shell body (1) the left surface outside and surrounds the left side air channel (f1) that front and back connect; Said right edge wind coaming plate (11) links to each other with said spout shell body (1) the right flank outside and surrounds the right edge air channel (f2) that front and back connect;
Be respectively equipped with the left side wind controllable register (4) and the right edge wind controllable register (5) of vertical placement within the said left-external side passage (f1) with within the right outer passage (f2);
Said left inner reinforced plate (9) and said right inner reinforced plate (10) lay respectively at the left and right sides within the said spout shell body (1); Said left inner reinforced plate (9) and the inboard left light powder passage (g1) that links to each other and surround the front and back perforation of said spout shell body (1) left surface; Said right inner reinforced plate (10) and the inboard right light powder passage (g2) that links to each other and surround the front and back perforation of said spout shell body (1) right flank; Said left inner reinforced plate (9) rear end and right inner reinforced plate (10) rear end all are positioned at said spout shell body (1) rear end face side before;
Described upward collection powder shunting flame holder (2) and described next part powder shunting flame holder (3) lay respectively between the both sides up and down and said left inner reinforced plate (9) and right inner reinforced plate (10) within the said spout shell body (1); Said upward collection powder shunting flame holder 2 is the diminishing from top to bottom step-like structure of cross section; Said next part powder shunting flame holder (3) be the diminishing from the bottom to top step-like structure of cross section, and the small bore end face of two step-like structures is relative and leave the space;
The said both sides, collection powder shunting flame holder (2) upper end of going up are fixedly linked with said left inner reinforced plate (9) upper end and right inner reinforced plate (10) upper end respectively; Said next part powder shunting flame holder (3) both sides, lower end are fixedly linked with said left inner reinforced plate (9) lower end and right inner reinforced plate (10) lower end respectively; Said upward collection powder shunting flame holder (2) front end and said next part powder shunting flame holder (3) front end extend to said secondary varying cross-section duct (6) and one-level varying cross-section duct (7) intersection respectively;
The last light powder passage (a1) of perforation before and after said upward collection powder shunting flame holder (2) upper side and said spout shell body (1) upper side inboard, said spout shell body (1) left surface inner top side side and right flank inner top side side are encircled into; The following light powder passage (a2) that connects before and after said next part powder shunting flame holder (2) downside and said spout shell body (1) downside inboard, left surface inside lower end side and right flank inside lower end side are encircled into; Said upward collection powder shunting flame holder (2) rear end and next part powder shunting flame holder (3) rear end all flush with said left inner reinforced plate (9) rear end face and right inner reinforced plate (10) rear end face;
The said said next part powder of going up collection powder shunting flame holder (2) and step-like structure of step-like structure is shunted between the flame holder (3) and is left intermediate space; The part that this intermediate space is positioned at one-level varying cross-section duct (7) is one-level shunting zone (e); The part that this intermediate space is positioned at secondary varying cross-section duct (6) is preceding powder-collecting chamber (b1); The remainder of this intermediate space is a back powder-collecting chamber (b2); Powder-collecting chamber (b2) left side is separated by left inner reinforced plate (9) and left light powder passage (g1), and powder-collecting chamber (b2) right side is separated by right inner reinforced plate (10) and right light powder passage (g2); The space that said secondary varying cross-section duct (6), said upward collection powder shunting flame holder (2) left surface and next part powder shunting flame holder (3) left surface surround is the second from left level shunting zone (h1); The space that said secondary varying cross-section duct (6), said upward collection powder shunting flame holder (2) right flank and next part powder shunting flame holder (3) right flank surround is a right secondary shunting zone (h2); The second from left level shunting zone (h1) is top and right secondary shunting zone (h2) is top all is connected with last light powder passage (a1), and the second from left level shunting zone (h1) is following all to be connected with following light powder passage (a2) with right secondary shunting zone (h2) is following; The second from left level shunting zone (h1) Right Inboard and the left inboard of right secondary shunting zone (h2) are connected with powder-collecting chamber (b1) respectively; The second from left level shunting zone (h1) back is connected with the light powder passage in a left side (g1), and right secondary shunting zone (h2) back is connected with the light powder passage in the right side (g2);
The space of going up collection powder shunting flame holder (2) rear end that said spout shell body (1) rear portion surrounds in the space is last smoke backflow district (c1); The space that said spout shell body (1) rear portion surrounds next part powder shunting flame holder (3) rear end in the space is following smoke backflow district (c2); Said upward smoke backflow district (c1) and said space between the smoke backflow district (c2) down are dense powder flow area (d); Other space that said spout shell body (1) rear portion surrounds in the space is the light powder flow area of the light powder outflow of last light powder passage (a1), following light powder passage (a2), left light powder passage (g1) and right light powder passage (g2); Said left side of going up smoke backflow district (c1) and front portion, following smoke backflow district (c2) and dense powder flow area (d) is separated by left inner reinforced plate (9) and left light powder passage (g1), and the right side is separated by right inner reinforced plate (10) and right light powder passage (g2).The anterior upside in last smoke backflow district (c1) separates through last collection powder shunting flame holder (2) and last light powder passage (a1); The anterior downside in following smoke backflow district (c2) separates through next part powder shunting flame holder (3) and following light powder passage (a2).
2. the coal dust decoupling burning method of a low-nitrogen oxide discharging, the coal dust decoupling burning device of its low-nitrogen oxide discharging is made up of burner body and the burner nozzle that is communicated in said burner body front port;
Described burner nozzle by spout shell body (1), secondary varying cross-section duct (6), one-level varying cross-section duct (7), left side wind coaming plate (8), right edge wind coaming plate (11), interior left gusset (9), interior right web plate (10), on collect powder shunting flame holder (2) and shunt flame holder (3) with the next part powder and form;
Said secondary varying cross-section duct (6) and said one-level varying cross-section duct (7) securely are connected in said spout shell body (1) front port successively; The edge is by the airflow direction behind the forward direction, and said one-level varying cross-section duct (7) and secondary varying cross-section duct (6) are cross sectional shape continually varying varying cross-section duct; The left and right sides face of said secondary varying cross-section duct (6) is relatively outward-dipping; The left and right sides face of said one-level varying cross-section duct (7) relatively slopes inwardly, and the two sides up and down of said one-level varying cross-section duct (7) are relatively outward-dipping; Said one-level varying cross-section duct (7) is identical with said secondary varying cross-section duct (6) connection sectional dimension and be fastenedly connected; Said left side wind coaming plate (8) and said right edge wind coaming plate (11) lay respectively at the left and right sides outside the said spout shell body (1); Said left side wind coaming plate (8) links to each other with said spout shell body (1) the left surface outside and surrounds the left side air channel (f1) that front and back connect; Said right edge wind coaming plate (11) links to each other with said spout shell body (1) the right flank outside and surrounds the right edge air channel (f2) that front and back connect;
Be respectively equipped with the left side wind controllable register (4) and the right edge wind controllable register (5) of vertical placement within the said left-external side passage (f1) with within the right outer passage (f2);
Said left inner reinforced plate (9) and said right inner reinforced plate (10) lay respectively at the left and right sides within the said spout shell body (1); Said left inner reinforced plate (9) and the inboard left light powder passage (g1) that links to each other and surround the front and back perforation of said spout shell body (1) left surface; Said right inner reinforced plate (10) and the inboard right light powder passage (g2) that links to each other and surround the front and back perforation of said spout shell body (1) right flank; Said left inner reinforced plate (9) rear end and right inner reinforced plate (10) rear end all are positioned at said spout shell body (1) rear end face side before;
Described upward collection powder shunting flame holder (2) and described next part powder shunting flame holder (3) lay respectively between the both sides up and down and said left inner reinforced plate (9) and right inner reinforced plate (10) within the said spout shell body (1); Said upward collection powder shunting flame holder 2 is the diminishing from top to bottom step-like structure of cross section; Said next part powder shunting flame holder (3) be the diminishing from the bottom to top step-like structure of cross section, and the small bore end face of two step-like structures is relative and leave the space;
The said both sides, collection powder shunting flame holder (2) upper end of going up are fixedly linked with said left inner reinforced plate (9) upper end and right inner reinforced plate (10) upper end respectively; Said next part powder shunting flame holder (3) both sides, lower end are fixedly linked with said left inner reinforced plate (9) lower end and right inner reinforced plate (10) lower end respectively; Said upward collection powder shunting flame holder (2) front end and said next part powder shunting flame holder (3) front end extend to said secondary varying cross-section duct (6) and one-level varying cross-section duct (7) intersection respectively;
The last light powder passage (a1) of perforation before and after said upward collection powder shunting flame holder (2) upper side and said spout shell body (1) upper side inboard, said spout shell body (1) left surface inner top side side and right flank inner top side side are encircled into; The following light powder passage (a2) that connects before and after said next part powder shunting flame holder (2) downside and said spout shell body (1) downside inboard, left surface inside lower end side and right flank inside lower end side are encircled into; All (end face after 90s and right inner reinforced plate (10) rear end face flush with said left inner reinforced plate for said upward collection powder shunting flame holder (2) rear end and next part powder shunting flame holder () 3 rear ends;
The said said next part powder of going up collection powder shunting flame holder (2) and step-like structure of step-like structure is shunted between the flame holder (3) and is left intermediate space; The part that this intermediate space is positioned at one-level varying cross-section duct (7) is one-level shunting zone (e); The part that this intermediate space is positioned at secondary varying cross-section duct (6) is preceding powder-collecting chamber (b1); The remainder of this intermediate space is a back powder-collecting chamber (b2); Powder-collecting chamber (b2) left side is separated by left inner reinforced plate (9) and left light powder passage (g1), and powder-collecting chamber (b2) right side is separated by right inner reinforced plate (10) and right light powder passage (g2); The space that said secondary varying cross-section duct (6), said upward collection powder shunting flame holder (2) left surface and next part powder shunting flame holder (3) left surface surround is the second from left level shunting zone (h1); The space that said secondary varying cross-section duct (6), said upward collection powder shunting flame holder (2) right flank and next part powder shunting flame holder (3) right flank surround is a right secondary shunting zone (h2); The second from left level shunting zone (h1) is top and right secondary shunting zone (h2) is top all is connected with last light powder passage (a1), and the second from left level shunting zone (h1) is following all to be connected with following light powder passage (a2) with right secondary shunting zone (h2) is following; About the second from left level shunting zone (h1) about inboard and right secondary shunting zone (h2) inboard be connected with powder-collecting chamber (b1) respectively; The second from left level shunting zone (h1) back is connected with the light powder passage in a left side (g1), and right secondary shunting zone (h2) back is connected with the light powder passage in the right side (g2);
The space of going up collection powder shunting flame holder (2) rear end that said spout shell body (1) rear portion surrounds in the space is last smoke backflow district (c1); The space that said spout shell body (1) rear portion surrounds next part powder shunting flame holder (3) rear end in the space is following smoke backflow district (c2); Said upward smoke backflow district (c1) and said space between the smoke backflow district (c2) down are dense powder flow area (d); Other space that said spout shell body (1) rear portion surrounds in the space is the light powder flow area of the light powder outflow of last light powder passage (a1), following light powder passage (a2), left light powder passage (g1) and right light powder passage (g2); Said left side of going up smoke backflow district (c1) and front portion, following smoke backflow district (c2) and dense powder flow area (d) is separated by left inner reinforced plate (9) and left light powder passage (g1), and the right side is separated by right inner reinforced plate (10) and right light powder passage (g2).The anterior upside in last smoke backflow district (c1) separates through last collection powder shunting flame holder (2) and last light powder passage (a1); The anterior downside in following smoke backflow district (c2) separates through next part powder shunting flame holder (3) and following light powder passage (a2);
The coal dust decoupling burning method of its low-nitrogen oxide discharging is:
A wind wind powder mixture at first gets into the one-level shunting zone (e) of decoupling burning device spout; Laterally shrink gradually at one-level varying cross-section duct (7) sidewall; Go up in the next space of amplifying gradually; Receive wind wind powder mixture of a guide effect part of one-level varying cross-section duct (7) sidewall current downflow that makes progress, get into respectively and go up light powder passage (a1) and time light powder passage (a2); Because the density of coal dust is bigger than air; Effect of inertia makes the most of powder-collecting chamber (b1) that gets into of coal dust; Airflow flowing is taken light powder passage (a1) and following light powder passage (a2) to about having only few part coal dust quilt, and the burner hearth that gets into thus, thereby realizes the deep or light separation of the wind powder mixture first order; The air quality of a wind wind powder mixture that is concentrated and the ratio of quality of pc are reduced to 0.6~1.8 by original 1.0~3.0, and coal powder density increases;
After this wind powder mixture that is concentrated gets into preceding powder-collecting chamber (b1); Owing to be subjected to the extruding influence in space between collection powder shunting flame holder (2) and the next part powder shunting flame holder (3); Portion of air is to two side flow; Get into left light powder passage (g1) and right light powder passage (g2) respectively; Because the effect of inertia of coal dust makes its most of back powder-collecting chamber (b2) that gets into, and has only few part to be taken to left light powder passage (g1) and right light powder passage (g2) by left and right sides airflow flowing, and gets into the burner hearth of decoupling burning device thus; Thereby realize the partial deep or light separation of wind powder mixture, the air quality of the wind powder mixture that is concentrated and the ratio of quality of pc further are reduced to 0.3~1.2;
Under the staged convex edge effect of last collection powder shunting flame holder (2) and next part powder shunting flame holder (3); The middle part of the concentrated breeze airflow of powder-collecting chamber (b2) after getting into is because the space is narrower and small; The portion of air at middle part makes the coal powder density at air-flow middle part further increase to two side flow; Owing to flow to the effect of entrainmenting of going up bottom of the dense powder air-flow of burner burner hearth from back powder-collecting chamber (b2); Make the high-temperature flue gas in the burner hearth constantly flow to the burner nozzle direction; And entrainment into dense powder flow area (d) from last smoke backflow district (c1) and following smoke backflow district (c2); Make the temperature of mixed airflow raise fast, catch fire rapidly, realize the fast pyrogenation gasification of coal dust;
Along with this dense powder air-flow flows in burner hearth; This dense powder air-flow in time mixes with the light powder air-flow of aforementioned light powder flow area; Under the effect of the combustion heat and the hot flue gas of high temperature reflux; Sidepiece is sneaked into air-flow and is heated to ignition temperature in succession, remains the pyrolytic gasification of coal dust fast, makes in the coal fugitive constituent fully separate out and burn;
Unburnt semicoke in time mixes with adjacent secondary wind in burner hearth and burns away, and sufficient oxygen in time mixes in the high-temperature region with the coal dust semicoke can guarantee its abundant after-flame; Through catching fire step by step from inside to outside, the mode that oxygen is supplied with is step by step accomplished the process of after-flame under high temperature oxidation stability atmosphere again of under reducing atmosphere, burning earlier, realizes reducing simultaneously the decoupling burning of NOx and combustible discharging like this.
CN201110033811.8A 2011-01-31 2011-01-31 Pulverized coal decoupling combustor with low nitrogen oxide discharge and pulverized coal decoupling combustion method with low nitrogen oxide discharge CN102620291B (en)

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