CN102620291B - 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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Publication number
CN102620291B
CN102620291B CN201110033811.8A CN201110033811A CN102620291B CN 102620291 B CN102620291 B CN 102620291B CN 201110033811 A CN201110033811 A CN 201110033811A CN 102620291 B CN102620291 B CN 102620291B
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China
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powder
flame holder
gusset
shunting
duct
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CN102620291A (en
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郝江平
高士秋
李静海
蔡连国
许光文
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Beijing Yuanneng Industry Technology Co ltd
Shanxi Sanhesheng Industry Technology Co ltd
Institute of Process Engineering of CAS
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Beijing Yuanneng Industry Technology Co ltd
Shanxi Sanhesheng Industry Technology Co ltd
Institute of Process Engineering of CAS
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    • 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

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 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 is in the ignition temperature of combustion phases and the raising of oxygen concentration, the content of fly ash combustible material in flue gas (uncompleted burned carbon and CO) reduces, and coal dust is quick, abundant after-flame more easily; Meanwhile, the high-temperature oxygen-enriched NO that generates in combustion process of can making again xsignificantly improve; On the other hand, coal air mixture is in the ignition temperature of combustion phases with oxygen concentration is more low is more conducive to suppress nitrogen oxide NO xgenerate, but coal dust is more difficult for after-flame.Thereby, fly ash combustible material and the NO of releasing coal dust firing xcoupling emission problem be long-standing technological difficulties in combustion technology.
At present, the low NO that is applicable to pulverized coal firing boiler having developed xcombustion technology mainly contains Researched of Air Staging Combustion Burning Pulverized Coal technology, fuel-staged combustion technology, flue gas recirculation combustion technology etc.Due to aforesaid coupling discharge relation, these several 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 Researched of Air Staging Combustion Burning Pulverized Coal Techniques For Reducing NO xefficiency lower, also can make the stage of oxygen-enriched combusting delay simultaneously, cause the increased content of fly ash combustible material, and in burner hearth on a large scale reducing atmosphere also make the high temperature corrosion probability of burner hearth coking and water-cooling wall greatly increase; Fuel-staged combustion technology only, in the time of the secondary fuel that uses combustion gas and light oil etc. taking hydrocarbon compound as master, just has higher NO xreduction efficiency and maintenance are compared with high burning efficiency, but this scheme sharply increases fuel cost, equipment investment and maintenance cost, so domestic application is less.Flue gas recirculation combustion technology reduces NO xlower, the equipment investment of efficiency and operation and maintenance cost higher, also can increase the content of fly ash combustible material in 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 to a certain extent NO xdischarge, but because thickening efficiency is not high, the A/C(air quality of the thick coal culm air-flow after concentrated and the ratio of quality of pc) many between 0.8~1.3, particularly for volatile matter lower than 10%~20% coal, air capacity when this air-flow coal dust firing still higher than or approach the required air capacity of volatile combustion in coal, the gas-phase reaction speed of volatile matter and oxygen, thereby this burning condition will inevitably make a large amount of and combination with oxygen of nitrogen that in coal, pyrolysis goes out, changes into NO x.The NO having generated xalthough can be by controlling the supply process of air, make it to utilize semicoke to burn and carry out partial reduction in reducing atmosphere, the solid reaction rate restriction but this heterogeneous reaction is bullied, this stage taking C, CO etc. as main reducing agent reactivity lower, air-flow enters after furnace cavity expansion, reducing agent diffusion velocity and and NO xcontact probability extremely low, thereby reduction reaction is difficult to fully complete in burner hearth, reduces NO xthe efficiency of discharge is lower.
Burning Technique by Dispelling Coupling can be realized the fly ash combustible material and the NO that remove coal burning xcoupling discharge relation, be to reduce fly ash combustible material and NO simultaneously xthe effective ways of discharge.Its mechanism is: coal burning process is divided into two stages, and the first stage, coal issues heat-dissipating solution, gasification and gas-fired in very high reducing atmosphere, utilizes the pyrolysis of coal self and gasification product by fuel type NO xbe converted into more stable N 2; Second stage is created high-temperature oxygen-enriched but is not produced thermal NO xenvironment, then guarantee the abundant after-flame of coal; This stage is reduced NO xmainly to utilize semicoke self aptitude to burn.
As can be seen here, decoupling burning suppresses NO xthe critical process of discharge, the conversion process of the fugitive constituent nitrogen producing at burning initial stage pyrolytic gasification, this process mainly less spatial dimension before wind inside, a Secondary Air mix is carried out, after one time wind mixes with Secondary Air, start the after-flame stage, the reducing atmosphere of burner hearth on a large scale that does not need aforesaid Researched of Air Staging Combustion Burning Pulverized Coal to produce.This process is also equivalent to the fractional combustion on microcosmic, and just mechanism is different from the Researched of Air Staging Combustion Burning Pulverized Coal in aforesaid macroscopic view, and the reducing agent of decoupling burning is more pyrolytic gasification product, and reactivity is higher.
At present, people reduce NO to decoupling burning xmechanism conduct in-depth research, and there are being applicable to a series of patents of layered decoupling combustion furnace, suppress as a kind of nitrogen oxide smokeless coal-burning method and coal furnace (Chinese invention patent number: ZL95102081.1), realize multi-face solid combustion furnace and the combustion method (Chinese invention patent number: ZL200410098603.6) etc. thereof of Coal Clean burning.But, in above-mentioned these patents, be all only suitable in layer combustion technology, be only applicable to 20 tons/middle-size and small-size decoupling combustion furnace below h, the decoupling combustion furnace that is difficult to realize coal dust firing maximizes.
Summary of the invention
Therefore, the object of the invention is to overcome the defect of prior art, thereby a kind of method that can be used for coal dust decoupling burning is provided.Another object of the present invention is to provide a kind of coal dust decoupling burning device.
The coal dust decoupling burning device of low-nitrogen oxide discharging provided by the invention, as shown in Figures 1 to 7, it is made up of burner body and the burner nozzle that is communicated in described burner body front port;
Described burner nozzle is made up of spout shell body 1, secondary varying cross-section duct 6, one-level varying cross-section duct 7, limit, left side wind coaming plate 8, right edge wind coaming plate 11, left inside gusset 9, right inside gusset 10, upper collection powder shunting flame holder 2 and next part powder shunting flame holder 3;
Described secondary varying cross-section duct 6 and described one-level varying cross-section duct 7 are securely connected in described spout shell body 1 front port successively; Edge is by the airflow direction after forward direction, and described 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 of described secondary varying cross-section duct 6 are relatively outward-dipping; The left and right sides of described one-level varying cross-section duct 7 relatively slope inwardly, and the two sides up and down of described one-level varying cross-section duct 7 are relatively outward-dipping; Described one-level varying cross-section duct 7 is identical with described secondary varying cross-section duct 6 connection sectional dimensions and be fastenedly connected; Limit, described left side wind coaming plate 8 and described right edge wind coaming plate 11 lay respectively at the left and right sides outside described spout shell body 1; Limit, described left side wind coaming plate 8 is connected and surrounds limit, the left side air channel f1 that front and back connect with described spout shell body 1 left surface outside; Described right edge wind coaming plate 11 is connected and surrounds the right edge air channel f2 that front and back connect with described spout shell body 1 right flank outside;
Within the f1 of air channel, limit, described left side with within the f2 of right edge air channel, be respectively equipped with limit, left side wind controllable register 4 and the right edge wind controllable register 5 of vertical placement;
Described left inside gusset 9 and described right inside gusset 10 lay respectively at the left and right sides within described spout shell body 1; Described left inside gusset 9 is connected and surrounds a left side light powder passage g1 that front and back connect with described spout shell body 1 left surface inner side; Described right inside gusset 10 is connected and surrounds the right side light powder passage g2 that front and back connect with described spout shell body 1 right flank inner side; Described left inside gusset 9 rear ends and right inside gusset 10 rear ends are all positioned at described spout shell body 1 rear end face side before;
Described upper 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 described left inside gusset 9 and right inside gusset 10 within described spout shell body 1; The described upper powder shunting flame holder 2 that integrates is as cross section diminishing step-like structure from top to bottom; Described next part powder shunting flame holder 3 be cross section diminishing step-like structure from the bottom to top, and the small bore end face of two step-like structures is relative and leave space;
Described upper collection powder shunting flame holder 2 both sides, upper end are fixedly linked with described left inside gusset 9 upper ends and right inside gusset 10 upper ends respectively; Described next part powder shunting flame holder 3 both sides, lower end are fixedly linked with described left inside gusset 9 lower ends and right inside gusset 10 lower ends respectively; Described upper collection powder shunting flame holder 2 front ends and described next part powder shunting flame holder 3 front ends extend to respectively described secondary varying cross-section duct 6 and one-level varying cross-section duct 7 intersections;
The upper light powder passage a1 connecting before and after described upper collection powder shunting flame holder 2 upper sides and described spout shell body 1 upper side inner side, described spout shell body 1 left surface inner top side side and right flank inner top side side are encircled into; The lower light powder passage a2 connecting before and after described next part powder shunting flame holder 2 downsides and described spout shell body 1 downside inner side, left surface inside lower end side and right flank inside lower end side are encircled into; Described upper collection powder shunting flame holder 2 rear ends and next part powder shunting flame holder 3 rear ends all flush with described left inside gusset 9 rear end faces and right inside gusset 10 rear end faces;
Between the described next part powder shunting flame holder 3 of the described upper collection powder shunting flame holder 2 of step-like structure and step-like structure, leave 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 front b1 of powder-collecting chamber; The remainder of this intermediate space is the rear b2 of powder-collecting chamber; The b2 of powder-collecting chamber left side is separated with left light powder passage g1 by left inside gusset 9, and the b2 of powder-collecting chamber right side is separated with right light powder passage g2 by right inside gusset 10; Described secondary varying cross-section duct 6, described upper powder shunting flame holder 2 left surfaces and the next part powder of integrating are shunted space that flame holder 3 left surfaces surround as the second from left level shunt district h1; The space that described secondary varying cross-section duct 6, described upper collection powder shunting flame holder 2 right flanks and next part powder shunting flame holder 3 right flanks surround is right secondary shunting zone h2; Above the second from left level shunt district h1 He above right secondary shunting zone h2, be all connected with upper light powder passage a1, below the second from left level shunt district h1 and below right secondary shunting zone h2, be all connected with lower light powder passage a2; The second from left level shunt district h1 Right Inboard and the left inside side of right secondary shunting zone h2 are connected with the b1 of powder-collecting chamber respectively; After the second from left level shunt district h1, be connected with a left side light powder passage g1, be connected with the right side light powder passage g2 after right secondary shunting zone h2;
The space that described spout shell body 1 rear portion surrounds upper collection powder shunting flame holder 2 rear ends in space is upper smoke backflow district c1; The space that described spout shell body 1 rear portion surrounds next part powder shunting flame holder 3 rear ends in space is lower smoke backflow district c2; Wei Nongfen flow area, space d between described upper smoke backflow district c1 and described lower smoke backflow district c2; Other space that described spout shell body 1 rear portion surrounds in space is the light powder flow area of the light powder outflow of upper light powder passage a1, lower light powder passage a2, left light powder passage g1 and right light powder passage g2; Described upper smoke backflow district c1 and lower smoke backflow district c2 left side anterior and dense powder flow area d is separated with left light powder passage g1 by left inside gusset 9, and right side is separated with right light powder passage g2 by right inside gusset 10.The upside of c1 front portion, upper smoke backflow district separates with upper light powder passage a1 by upper collection powder shunting flame holder 2; The downside of c2 front portion, lower smoke backflow district separates with lower light powder passage a2 by next part powder shunting flame holder 3.
The coal dust decoupling burning method of low-nitrogen oxide discharging provided by the invention, it is:
First a wind wind powder mixture enters the one-level shunting zone e of decoupling burning device spout, laterally shrink gradually at one-level varying cross-section duct 7 sidewalls, in upper next space of amplifying gradually, flowed up and down by wind wind powder mixture of a guide effect part of one-level varying cross-section duct 7 sidewalls, enter respectively light powder passage a1 and lower light powder passage a2; Because the density ratio air of coal dust is large, effect of inertia makes coal dust major part enter the b1 of powder-collecting chamber, only have small part coal dust to be taken to upper light powder passage a1 and lower light powder passage a2 by the air-flow of upper current downflow, and enter thus burner hearth, thereby realize the deep or light separation of the wind powder mixture first order, the air quality of a wind wind powder mixture being 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;
This wind powder mixture being concentrated enters after the front b1 of powder-collecting chamber, owing to being subject to collecting the extruding impact in space between powder shunting flame holder 2 and 3, portion of air is to two side flow, enter respectively left light powder passage g1 and right light powder passage g2, because making its major part, the effect of inertia of coal dust enters the rear b2 of powder-collecting chamber, only have the air-flow that small part is flowed by left and right to take left light powder passage g1 and right light powder passage g2 to, and enter thus the burner hearth of decoupling burning device, thereby realize the deep or light separation of the second level of wind powder mixture, the air quality of the wind powder mixture being concentrated and the ratio of quality of pc are further reduced to 0.3~1.2,
Under the staged convex edge effect of upper collection powder shunting flame holder 2 and next part powder shunting flame holder 3, enter the middle part of concentrated breeze airflow of the rear b2 of powder-collecting chamber because space is narrower and small, the portion of air at middle part, to two side flow, further increases the coal powder density at air-flow middle part; Owing to flowing to the upper following effect of entrainmenting of dense powder air-flow of burner hearth from the rear b2 of powder-collecting chamber, high-temperature flue gas in burner hearth is constantly flowed to burner nozzle direction, and entrainment into dense powder flow area d from upper smoke backflow district c1 and lower smoke backflow district c2, the temperature of mixed airflow is 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 mixes in time 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 in succession heated to ignition temperature, remain fast the pyrolytic gasification of coal dust, make fugitive constituent in coal fully separate out and burn; Unburnt semicoke mixes and burns away with adjacent Secondary Air in time in burner hearth, and sufficient oxygen mixes in high-temperature region and can guarantee its abundant after-flame in time with coal dust semicoke; By catching fire step by step from inside to outside, the mode that oxygen is supplied with step by step, completes the first burning process of after-flame under high temperature oxidation stability atmosphere again under reducing atmosphere, realizes the decoupling burning that simultaneously reduces NOx and combustible discharge 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, by the compound action of collection powder shunting flame holder and varying cross-section duct, utilized the conversion of air-flow dynamic and static pressure energy, made pulverized coal flow and an air stream in wind wind powder mixed airflow naturally 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, not only separate circumference long, also can make air-flow steering angle little, to reduce turbulent flow and eddy current, the form separating by two-stage or plural serial stage, can meet or exceed the Pulverized Coal Concentration efficiency of cyclone separator, equipment pressure drop and wearing and tearing are much smaller than cyclone separator;
2, burner nozzle design extends to the space of entrainmenting thermal flue gas back stream in burner nozzle from hearth combustor, it is the time of burning under the reducing atmosphere in order to extend the decoupling burning initial stage on the one hand, increase the interval that wind wind powder mixture air-flow mixes with burner hearth inner second air, to reduce the generation of 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 high warm flue gas in burner hearth, keep near higher temperature levels combustion zone, be conducive to carrying out fast of decoupling burning, decoupling burning can improve again near the temperature in combustion zone conversely fast, forms benign cycle.The decoupling burning initial stage is to carry out under very high coal powder density (A/C is 0.2~1.0), and for low-volatite coal such as anthracites, dense powder concentration is more high better, is conducive to steady combustion, is also conducive to suppress 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 easily too strong, coal powder density height can the agent of control combustion initial oxidation content lower than the stoichiometric ratio of volatile combustion reaction, and the exothermic oxidation reaction of burning is also accompanied by the endothermic reaction of pyrolysis and gasification simultaneously, gas flow temperature is also not bery high, thereby this is conducive to be avoided scaling loss and the coking of burner nozzle.
3, two collection powder shunting flame holder positioned opposite, form the upper and lower both sides of concentrated breeze airflow and entrainment heating, and firing rate and the degree of depth significantly improve; Two relative sides of collection powder shunting flame holder are designed to middle ware apart from the staged convex edge little, both sides spacing is large at a distance of nearest position, increased the surface area that entrainments of the upper and lower both sides of concentrated breeze airflow, have greatly increased the ability of entrainmenting; Backflow space maximum is entrainmented in middle part, makes the thermal flue gas back flow maximum of dense powder air-flow mid portion unit breeze airflow amount; Meanwhile, the stroke of middle part pulverized coal air mixed airflow is the longest, and it is maximum that air is squeezed, thereby coal powder density maximum, correspondingly both sides coal powder density 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, Nong Fen 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, entrainment carrying capacity also the highest; Because most of coal dust is washed into collection powder shunting flame holder, absolute velocity reduces, and forms and the larger sliding velocity of air stream, can significantly improve the heat and mass ability of the two; The staged convex edges of two of positioned opposite collection powder shunting flame holders make thick coal culm air flow rate, Pulverized Coal Concentration rate, mean flow rate, the relative sliding velocity of coal dust, entrainment backflow space and be also staged to two sidewind heat and mass speed and distribute, and reach middle part breeze airflow MAF minimum, coal powder density is the highest, mean flow rate is the highest, coal dust sliding velocity maximum, to 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, dispel the heat the slowest, 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, around light powder air-flow is heated to ignition temperature in succession, catches fire step by step from inside to outside subsequently.
4, from middle part to periphery, the concentration of breeze airflow forms by dense thin out certain distribution, can the adaptability of enhanced burning device structure to coal; By central point burning coal powder, then flame is progressively extended laterally, along with the enhancing of burning, coke takes fire, and oxygen amount is just corresponding to be increased gradually, this combustion system, not only favourable to reducing NOx, also can make outside ignition point away from burner, avoid 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 simultaneously to entrainment high-temperature flue gas, can make the burning of breeze airflow quick ignition, the further violent heated air stream of reaction heat after breeze airflow burning, can make dense gas flow temperature be elevated to rapidly 700~1200 DEG C of high temperature, 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 pyrolysis gas dissolves, the overwhelming majority is gas-phase reaction fast, completes major part before can making dense powder air-flow mix with light powder air-flow to have separated out the burning of volatile matter under Hypoxic habitats.Due to 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 2.After the volatile combustion of dense powder air-flow, progressively mix with light powder air-flow, in coal dust, coke burns in succession, the consumption of oxygen is increased, cause light powder air-flow and dense powder air-flow mixing after-combustion still under Hypoxic habitats, until after mixing with Secondary Air, the condition of combustion with meagre oxygen just changes to some extent.But because most of volatile has been burnt, and coke nitrogen while separating out first through carbon grain surface reducing atmosphere layer, be subject to the catalytic reduction effect of coke, thereby coke nitrogen is converted into NO simultaneously xratio very low.Burner combustion completes N earlier 2conversion after, can supplement in time Secondary Air, allow coal dust that high-temperature oxygen-enriched reaction occurs early, extend in the clean-burning time of burner hearth, thereby abundant after-flame reduces the content of fly ash combustible material, CO in flue gas.From the above mentioned, this combustion system has been removed fly ash combustible material, CO and the NO of coal dust firing xcoupling emission problem, realized the decoupling burning that the two discharge reduces simultaneously.
6, dense powder air-flow is in centre, and light powder air-flow is enclosed in outer one week, not only strengthened wind and entrainment the surface area of high-temperature flue gas, is conducive to burner stable combustion, reduces NO xgeneration, the wall membrane type that can form again burner housing is cooling, avoids burner scaling loss and burner coking, is also conducive to again prevent that coal dust segregation from departing from air-flow simultaneously, and increases ash content carbon; Dense powder air-flow and furnace wall are isolated by light powder air-flow at back-fire side, can reduce near the reducing atmosphere of water-cooling wall, be conducive to reduce the generation of furnace water cooling wall high-temperature corrosion and coking.
7, this burner strong adaptability.The project organization, size and the relative spacing that collect powder shunting flame holder by change, can change the design parameters such as breeze airflow concentration, flow velocity, to adapt to boiler and the coal characteristic of different designs.Regulate side air quantity by being adjusted in burner to the side wind controllable register 5 of fiery side (towards high temperature one side at burner hearth center), can be according to the variation of the burning condition such as ature of coal and boiler load, regulate near the environment temperature of burner hearth burner, avoid occurring combustion instability or burner scaling loss, remain that burner is in optimal combustion state; Regulate near the also flue gas oxygen content of adjustable 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 easily lighted, the oxygen demand of the pyrolytic gasification process at decoupling burning initial stage is also high, thereby can increase side air quantity, vice versa.
Regulate side air quantity by the side wind controllable register 4 that is adjusted in burner back-fire side (towards low temperature one side of furnace wall cooling), 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 left side air channel, limit f1 and right edge air channel f2 can be from the Secondary Air of boiler combustion system, and two baffle plates also can be arranged on this Secondary Air special air duct, carries out unified control; The air feed of side wind also can be from wind the light powder pipeline after deep or light separation; with reduce burner nozzle average oxygen content, reduce side wind wind-warm syndrome (less air quantity can be protected not overtemperature of burner wall) and avoid the disturbance of Secondary Air, be conducive to the difficult burning of coal of firing.
The aperture of side windshield plate can be controlled by the wall temperature value of recirculating zone side automatically according to the steady device of collection powder shunting flame.Collection powder shunting flame holder can reflect the height of recirculating zone temperature by the wall temperature of recirculating zone side, the height of recirculating zone temperature can reflect the environment temperature of burner, thereby one of setting makes burning reach optimum state, and (this state can make burner environment temperature optimum, can realize best decoupling burning effect, can avoid again scaling loss or the coking of burner) rational temperature given value, shunt the wall temperature value comparison of flame holder by recirculating zone side with the collection powder of actual measurement, its deviate is through controller processing, output regulates the instruction of side windshield plate aperture, to regulate side air quantity, thereby near control combustion device, environment temperature is all the time in desirable scope.
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 and steady combustion integrated design can reduce manufactures and installation cost.
Brief description of the 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 the structural representation of opening the burner nozzle of burner nozzle epipleural;
Fig. 3 is the structural representation of opening the burner nozzle of burner nozzle right plate;
Fig. 4 is the 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 top view of Fig. 1;
Fig. 7 is the left view of Fig. 1.
Detailed description of the invention
Further describe the present invention below in conjunction with drawings and Examples
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 the structural representation of opening the burner nozzle of burner nozzle epipleural; Fig. 3 is the structural representation of opening the burner nozzle of burner nozzle right plate; Fig. 4 is the 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 top view of Fig. 1; Fig. 7 is the left view of Fig. 1.As seen from the 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 described burner body front port;
Described burner nozzle is made up of spout shell body 1, secondary varying cross-section duct 6, one-level varying cross-section duct 7, limit, left side wind coaming plate 8, right edge wind coaming plate 11, left inside gusset 9, right inside gusset 10, upper collection powder shunting flame holder 2 and next part powder shunting flame holder 3;
Described secondary varying cross-section duct 6 and described one-level varying cross-section duct 7 are securely connected in described spout shell body 1 front port successively; Edge is by the airflow direction after forward direction, and described 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 of described secondary varying cross-section duct 6 are relatively outward-dipping; The left and right sides of described one-level varying cross-section duct 7 relatively slope inwardly, and the two sides up and down of described one-level varying cross-section duct 7 are relatively outward-dipping; Described one-level varying cross-section duct 7 is identical with described secondary varying cross-section duct 6 connection sectional dimensions and be fastenedly connected; Limit, described left side wind coaming plate 8 and described right edge wind coaming plate 11 lay respectively at the left and right sides outside described spout shell body 1; Limit, described left side wind coaming plate 8 is connected and surrounds limit, the left side air channel f1 that front and back connect with described spout shell body 1 left surface outside; Described right edge wind coaming plate 11 is connected and surrounds the right edge air channel f2 that front and back connect with described spout shell body 1 right flank outside;
Within the f1 of air channel, limit, described left side with within the f2 of right edge air channel, be respectively equipped with limit, left side wind controllable register 4 and the right edge wind controllable register 5 of vertical placement;
Described left inside gusset 9 and described right inside gusset 10 lay respectively at the left and right sides within described spout shell body 1; Described left inside gusset 9 is connected and surrounds a left side light powder passage g1 that front and back connect with described spout shell body 1 left surface inner side; Described right inside gusset 10 is connected and surrounds the right side light powder passage g2 that front and back connect with described spout shell body 1 right flank inner side; Described left inside gusset 9 rear ends and right inside gusset 10 rear ends are all positioned at described spout shell body 1 rear end face side before;
Described upper 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 described left inside gusset 9 and right inside gusset 10 within described spout shell body 1; The described upper powder shunting flame holder 2 that integrates is as cross section diminishing step-like structure from top to bottom; Described next part powder shunting flame holder 3 be cross section diminishing step-like structure from the bottom to top, and the small bore end face of two step-like structures is relative and leave space;
Described upper collection powder shunting flame holder 2 both sides, upper end are fixedly linked with described left inside gusset 9 upper ends and right inside gusset 10 upper ends respectively; Described next part powder shunting flame holder 3 both sides, lower end are fixedly linked with described left inside gusset 9 lower ends and right inside gusset 10 lower ends respectively; Described upper collection powder shunting flame holder 2 front ends and described next part powder shunting flame holder 3 front ends extend to respectively described secondary varying cross-section duct 6 and one-level varying cross-section duct 7 intersections;
The upper light powder passage a1 connecting before and after described upper collection powder shunting flame holder 2 upper sides and described spout shell body 1 upper side inner side, described spout shell body 1 left surface inner top side side and right flank inner top side side are encircled into; The lower light powder passage a2 connecting before and after described next part powder shunting flame holder 2 downsides and described spout shell body 1 downside inner side, left surface inside lower end side and right flank inside lower end side are encircled into; Described upper collection powder shunting flame holder 2 rear ends and next part powder shunting flame holder 3 rear ends all flush with described left inside gusset 9 rear end faces and right inside gusset 10 rear end faces;
Between the described next part powder shunting flame holder 3 of the described upper collection powder shunting flame holder 2 of step-like structure and step-like structure, leave 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 front b1 of powder-collecting chamber; The remainder of this intermediate space is the rear b2 of powder-collecting chamber; The b2 of powder-collecting chamber left side is separated with left light powder passage g1 by left inside gusset 9, and the b2 of powder-collecting chamber right side is separated with right light powder passage g2 by right inside gusset 10; Described secondary varying cross-section duct 6, described upper powder shunting flame holder 2 left surfaces and the next part powder of integrating are shunted space that flame holder 3 left surfaces surround as the second from left level shunt district h1; The space that described secondary varying cross-section duct 6, described upper collection powder shunting flame holder 2 right flanks and next part powder shunting flame holder 3 right flanks surround is right secondary shunting zone h2; Above the second from left level shunt district h1 He above right secondary shunting zone h2, be all connected with upper light powder passage a1, below the second from left level shunt district h1 and below right secondary shunting zone h2, be all connected with lower light powder passage a2; The second from left level shunt district h1 Right Inboard and the left inside side of right secondary shunting zone h2 are connected with the b1 of powder-collecting chamber respectively; After the second from left level shunt district h1, be connected with a left side light powder passage g1, be connected with the right side light powder passage g2 after right secondary shunting zone h2;
The space that described spout shell body 1 rear portion surrounds upper collection powder shunting flame holder 2 rear ends in space is upper smoke backflow district c1; The space that described spout shell body 1 rear portion surrounds next part powder shunting flame holder 3 rear ends in space is lower smoke backflow district c2; Wei Nongfen flow area, space d between described upper smoke backflow district c1 and described lower smoke backflow district c2; Other space that described spout shell body 1 rear portion surrounds in space is the light powder flow area of the light powder outflow of upper light powder passage a1, lower light powder passage a2, left light powder passage g1 and right light powder passage g2; Described upper smoke backflow district c1 and lower smoke backflow district c2 left side anterior and dense powder flow area d is separated with left light powder passage g1 by left inside gusset 9, and right side is separated with right light powder passage g2 by right inside gusset 10.The upside of c1 front portion, upper smoke backflow district separates with upper light powder passage a1 by upper collection powder shunting flame holder 2; The downside of c2 front portion, lower smoke backflow district separates with lower light powder passage a2 by next part powder shunting flame holder 3.
The coal dust decoupling burning of low-nitrogen oxide discharging of the present invention is: first a wind wind powder mixture enters the one-level shunting zone e of decoupling burning device spout, laterally shrink gradually at one-level varying cross-section duct 7 sidewalls, in upper next space of amplifying gradually, flowed up and down by wind wind powder mixture of a guide effect part of one-level varying cross-section duct 7 sidewalls, enter respectively light powder passage a1 and lower light powder passage a2; Because the density ratio air of coal dust is large, effect of inertia makes coal dust major part enter the b1 of powder-collecting chamber, only have small part coal dust to be taken to upper light powder passage a1 and lower light powder passage a2 by the air-flow of upper current downflow, and enter thus burner hearth, thereby realize the deep or light separation of the wind powder mixture first order, the air quality of a wind wind powder mixture being 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;
This wind powder mixture being concentrated enters after the front b1 of powder-collecting chamber, owing to being subject to collecting the extruding impact in space between powder shunting flame holder 2 and 3, portion of air is to two side flow, enter respectively left light powder passage g1 and right light powder passage g2, because making its major part, the effect of inertia of coal dust enters the rear b2 of powder-collecting chamber, only have the air-flow that small part is flowed by left and right to take left light powder passage g1 and right light powder passage g2 to, and enter thus the burner hearth of decoupling burning device, thereby realize the deep or light separation of the second level of wind powder mixture, the wind powder mixture being concentrated air quality and the ratio of quality of pc be further reduced to 0.3~1.2,
Under the staged convex edge effect of upper collection powder shunting flame holder 2 and next part powder shunting flame holder 3, enter the middle part of concentrated breeze airflow of the rear b2 of powder-collecting chamber because space is narrower and small, the portion of air at middle part, to two side flow, further increases the coal powder density at air-flow middle part; Owing to flowing to the upper following effect of entrainmenting of dense powder air-flow of burner hearth from the rear b2 of powder-collecting chamber, high-temperature flue gas in burner hearth is constantly flowed to burner nozzle direction, and entrainment into dense powder flow area d from upper smoke backflow district c1 and lower smoke backflow district c2, the temperature of mixed airflow is 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 mixes in time 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 in succession heated to ignition temperature, remain fast the pyrolytic gasification of coal dust, make fugitive constituent in coal fully separate out and burn; Unburnt semicoke mixes and burns away with adjacent Secondary Air in time in burner hearth, and sufficient oxygen mixes in high-temperature region and can guarantee its abundant after-flame in time with coal dust semicoke; By catching fire step by step from inside to outside, the mode that oxygen is supplied with step by step, completes the first burning process of after-flame under high temperature oxidation stability atmosphere again under reducing atmosphere, realizes the decoupling burning that simultaneously reduces NOx and combustible discharge like this.

Claims (2)

1. a coal dust decoupling burning device for low-nitrogen oxide discharging, it is made up of burner body and the burner nozzle that is communicated in described burner body front port;
Described burner nozzle is made up of spout shell body (1), secondary varying cross-section duct (6), one-level varying cross-section duct (7), limit, left side wind coaming plate (8), right edge wind coaming plate (11), left inside gusset (9), right inside gusset (10), upper collection powder shunting flame holder (2) and next part powder shunting flame holder (3);
Described secondary varying cross-section duct (6) and described one-level varying cross-section duct (7) are securely connected in described spout shell body (1) front port successively; Edge is by the airflow direction after forward direction, and described 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 of described secondary varying cross-section duct (6) are relatively outward-dipping; The left and right sides of described one-level varying cross-section duct (7) relatively slope inwardly, and the two sides up and down of described one-level varying cross-section duct (7) are relatively outward-dipping; Described one-level varying cross-section duct (7) is identical with described secondary varying cross-section duct (6) connection sectional dimension and be fastenedly connected; Limit, described left side wind coaming plate (8) and described right edge wind coaming plate (11) lay respectively at the left and right sides outside described spout shell body (1); Limit, described left side wind coaming plate (8) is connected and surrounds the air channel, limit, left side (f1) that front and back connect with described spout shell body (1) left surface outside; Described right edge wind coaming plate (11) is connected and surrounds the right edge air channel (f2) that front and back connect with described spout shell body (1) right flank outside;
Within air channel, limit, described left side (f1) with within right edge air channel (f2), be respectively equipped with limit, left side wind controllable register (4) and the right edge wind controllable register (5) of vertical placement;
Described left inside gusset (9) and described right inside gusset (10) lay respectively at the left and right sides within described spout shell body (1); Described left inside gusset (9) is connected and surrounds the light powder passage in a left side (g1) that front and back connect with described spout shell body (1) left surface inner side; Described right inside gusset (10) is connected and surrounds the light powder passage in the right side (g2) that front and back connect with described spout shell body (1) right flank inner side; Described left inside gusset (9) rear end and right inside gusset (10) rear end are all positioned at described spout shell body (1) rear end face side before;
Described upper 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 described left inside gusset (9) and right inside gusset (10) within described spout shell body (1); The described upper powder shunting flame holder 2 that integrates is as cross section diminishing step-like structure from top to bottom; Described next part powder shunting flame holder (3) be cross section diminishing step-like structure from the bottom to top, and the small bore end face of two step-like structures is relative and leave space;
Described upper collection powder shunting flame holder (2) both sides, upper end are fixedly linked with described left inside gusset (9) upper end and right inside gusset (10) upper end respectively; Described next part powder shunting flame holder (3) both sides, lower end are fixedly linked with described left inside gusset (9) lower end and right inside gusset (10) lower end respectively; Described upper collection powder shunting flame holder (2) front end and described next part powder shunting flame holder (3) front end extend to respectively described secondary varying cross-section duct (6) and one-level varying cross-section duct (7) intersection;
The upper light powder passage (a1) connecting before and after described upper collection powder shunting flame holder (2) upper side and described spout shell body (1) upper side inner side, described spout shell body (1) left surface inner top side side and right flank inner top side side are encircled into; The lower light powder passage (a2) connecting before and after described next part powder shunting flame holder (2) downside and described spout shell body (1) downside inner side, left surface inside lower end side and right flank inside lower end side are encircled into; Described upper collection powder shunting flame holder (2) rear end and next part powder shunting flame holder (3) rear end all flush with described left inside gusset (9) rear end face and right inside gusset (10) rear end face;
Between the described upper collection powder shunting flame holder (2) of step-like structure and the described next part powder shunting flame holder (3) of step-like structure, leave 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 front powder-collecting chamber (b1); The remainder of this intermediate space is rear powder-collecting chamber (b2); Powder-collecting chamber (b2) left side is separated by left inside gusset (9) and left light powder passage (g1), and powder-collecting chamber (b2) right side is separated by right inside gusset (10) and right light powder passage (g2); Described secondary varying cross-section duct (6), described upper powder shunting flame holder (2) left surface and the next part powder of integrating are shunted space that flame holder (3) left surface surrounds as the second from left level shunt district (h1); The space that described secondary varying cross-section duct (6), described upper collection powder shunting flame holder (2) right flank and next part powder shunting flame holder (3) right flank surround is right secondary shunting zone (h2); The second from left level shunt district (h1) is all connected with upper light powder passage (a1) above with right secondary shunting zone (h2) above, and the second from left level shunt district (h1) is all connected with lower light powder passage (a2) below with right secondary shunting zone (h2) below; The left inside side of the second from left level shunt district (h1) Right Inboard and right secondary shunting zone (h2) is connected with powder-collecting chamber (b1) respectively; The second from left level shunt district (h1) is connected with the light powder passage in a left side (g1) below, and right secondary shunting zone (h2) is connected with the light powder passage in the right side (g2) below;
The space that described spout shell body (1) rear portion surrounds upper collection powder shunting flame holder (2) rear end in space is upper smoke backflow district (c1); The space that described spout shell body (1) rear portion surrounds next part powder shunting flame holder (3) rear end in space is lower smoke backflow district (c2); Wei Nongfen flow area, space (d) between described upper smoke backflow district (c1) and described lower smoke backflow district (c2); Other space that described spout shell body (1) rear portion surrounds in space is the light powder flow area of the light powder outflow of upper light powder passage (a1), lower light powder passage (a2), left light powder passage (g1) and right light powder passage (g2); Described upper smoke backflow district (c1) and lower smoke backflow district (c2) left side anterior and dense powder flow area (d) is separated by left inside gusset (9) and left light powder passage (g1), and right side is separated by right inside gusset (10) and right light powder passage (g2); The anterior upside in upper smoke backflow district (c1) separates by upper collection powder shunting flame holder (2) and upper light powder passage (a1); The anterior downside in lower smoke backflow district (c2) separates by next part powder shunting flame holder (3) and lower light powder passage (a2).
2. a coal dust decoupling burning method for 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 described burner body front port;
Described burner nozzle is made up of spout shell body (1), secondary varying cross-section duct (6), one-level varying cross-section duct (7), limit, left side wind coaming plate (8), right edge wind coaming plate (11), left inside gusset (9), right inside right web plate (10), upper collection powder shunting flame holder (2) and next part powder shunting flame holder (3);
Described secondary varying cross-section duct (6) and described one-level varying cross-section duct (7) are securely connected in described spout shell body (1) front port successively; Edge is by the airflow direction after forward direction, and described 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 of described secondary varying cross-section duct (6) are relatively outward-dipping; The left and right sides of described one-level varying cross-section duct (7) relatively slope inwardly, and the two sides up and down of described one-level varying cross-section duct (7) are relatively outward-dipping; Described one-level varying cross-section duct (7) is identical with described secondary varying cross-section duct (6) connection sectional dimension and be fastenedly connected; Limit, described left side wind coaming plate (8) and described right edge wind coaming plate (11) lay respectively at the left and right sides outside described spout shell body (1); Limit, described left side wind coaming plate (8) is connected and surrounds the air channel, limit, left side (f1) that front and back connect with described spout shell body (1) left surface outside; Described right edge wind coaming plate (11) is connected and surrounds the right edge air channel (f2) that front and back connect with described spout shell body (1) right flank outside;
Within air channel, limit, described left side (f1) with within right edge air channel (f2), be respectively equipped with limit, left side wind controllable register (4) and the right edge wind controllable register (5) of vertical placement;
Described left inside gusset (9) and described right inside gusset (10) lay respectively at the left and right sides within described spout shell body (1); Described left inside gusset (9) is connected and surrounds the light powder passage in a left side (g1) that front and back connect with described spout shell body (1) left surface inner side; Described right inside gusset (10) is connected and surrounds the light powder passage in the right side (g2) that front and back connect with described spout shell body (1) right flank inner side; Described left inside gusset (9) rear end and right inside gusset (10) rear end are all positioned at described spout shell body (1) rear end face side before;
Described upper 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 described left inside gusset (9) and right inside gusset (10) within described spout shell body (1); The described upper powder shunting flame holder 2 that integrates is as cross section diminishing step-like structure from top to bottom; Described next part powder shunting flame holder (3) be cross section diminishing step-like structure from the bottom to top, and the small bore end face of two step-like structures is relative and leave space;
Described upper collection powder shunting flame holder (2) both sides, upper end are fixedly linked with described left inside gusset (9) upper end and right inside gusset (10) upper end respectively; Described next part powder shunting flame holder (3) both sides, lower end are fixedly linked with described left inside gusset (9) lower end and right inside gusset (10) lower end respectively; Described upper collection powder shunting flame holder (2) front end and described next part powder shunting flame holder (3) front end extend to respectively described secondary varying cross-section duct (6) and one-level varying cross-section duct (7) intersection;
The upper light powder passage (a1) connecting before and after described upper collection powder shunting flame holder (2) upper side and described spout shell body (1) upper side inner side, described spout shell body (1) left surface inner top side side and right flank inner top side side are encircled into; The lower light powder passage (a2) connecting before and after described next part powder shunting flame holder (2) downside and described spout shell body (1) downside inner side, left surface inside lower end side and right flank inside lower end side are encircled into; Described upper collection powder shunting flame holder (2) rear end and next part powder shunting flame holder (3) rear end all flush with described left inside gusset (9) rear end face and right inside gusset (10) rear end face;
Between the described upper collection powder shunting flame holder (2) of step-like structure and the described next part powder shunting flame holder (3) of step-like structure, leave 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 front powder-collecting chamber (b1); The remainder of this intermediate space is rear powder-collecting chamber (b2); Powder-collecting chamber (b2) left side is separated by left inside gusset (9) and left light powder passage (g1), and powder-collecting chamber (b2) right side is separated by right inside gusset (10) and right light powder passage (g2); Described secondary varying cross-section duct (6), described upper powder shunting flame holder (2) left surface and the next part powder of integrating are shunted space that flame holder (3) left surface surrounds as the second from left level shunt district (h1); The space that described secondary varying cross-section duct (6), described upper collection powder shunting flame holder (2) right flank and next part powder shunting flame holder (3) right flank surround is right secondary shunting zone (h2); The second from left level shunt district (h1) is all connected with upper light powder passage (a1) above with right secondary shunting zone (h2) above, and the second from left level shunt district (h1) is all connected with lower light powder passage (a2) below with right secondary shunting zone (h2) below; Inner side, left and right, the second from left level shunt district (h1) and inner side, left and right, right secondary shunting zone (h2) are connected with powder-collecting chamber (b1) respectively; The second from left level shunt district (h1) is connected with the light powder passage in a left side (g1) below, and right secondary shunting zone (h2) is connected with the light powder passage in the right side (g2) below;
The space that described spout shell body (1) rear portion surrounds upper collection powder shunting flame holder (2) rear end in space is upper smoke backflow district (c1); The space that described spout shell body (1) rear portion surrounds next part powder shunting flame holder (3) rear end in space is lower smoke backflow district (c2); Wei Nongfen flow area, space (d) between described upper smoke backflow district (c1) and described lower smoke backflow district (c2); Other space that described spout shell body (1) rear portion surrounds in space is the light powder flow area of the light powder outflow of upper light powder passage (a1), lower light powder passage (a2), left light powder passage (g1) and right light powder passage (g2); Described upper smoke backflow district (c1) and lower smoke backflow district (c2) left side anterior and dense powder flow area (d) is separated by left inside gusset (9) and left light powder passage (g1), and right side is separated by right inside gusset (10) and right light powder passage (g2); The anterior upside in upper smoke backflow district (c1) separates by upper collection powder shunting flame holder (2) and upper light powder passage (a1); The anterior downside in lower smoke backflow district (c2) separates by next part powder shunting flame holder (3) and lower light powder passage (a2);
The coal dust decoupling burning method of its low-nitrogen oxide discharging is:
First a wind wind powder mixture enters the one-level shunting zone (e) of decoupling burning device spout, laterally shrink gradually at one-level varying cross-section duct (7) sidewall, in upper next space of amplifying gradually, flowed up and down by wind wind powder mixture of a guide effect part of one-level varying cross-section duct (7) sidewall, enter respectively light powder passage (a1) and lower light powder passage (a2); Because the density ratio air of coal dust is large, effect of inertia makes coal dust major part enter powder-collecting chamber (b1), only have small part coal dust to be taken to upper light powder passage (a1) and lower light powder passage (a2) by the air-flow of upper current downflow, and the burner hearth entering thus, thereby realize the deep or light separation of the wind powder mixture first order, the air quality of a wind wind powder mixture being 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;
This wind powder mixture being concentrated enters after front powder-collecting chamber (b1), owing to being subject to the extruding impact in space between upper collection powder shunting flame holder (2) and next part powder shunting flame holder (3), portion of air is to two side flow, enter respectively left light powder passage (g1) and right light powder passage (g2), because making its major part, the effect of inertia of coal dust enters rear powder-collecting chamber (b2), only have the air-flow that small part is flowed by left and right to take left light powder passage (g1) and right light powder passage (g2) to, and enter thus the burner hearth of decoupling burning device, thereby realize the deep or light separation of the second level of wind powder mixture, the air quality of the wind powder mixture being concentrated and the ratio of quality of pc are further reduced to 0.3~1.2,
Under the effect of the staged convex edge of upper collection powder shunting flame holder (2) and next part powder shunting flame holder (3), enter the middle part of concentrated breeze airflow of rear powder-collecting chamber (b2) because space is narrower and small, the portion of air at middle part, to two side flow, further increases the coal powder density at air-flow middle part; Owing to flowing to the upper following effect of entrainmenting of dense powder air-flow of burner stove tank from rear powder-collecting chamber (b2), high-temperature flue gas in burner hearth is constantly flowed to burner nozzle direction, and entrainment into dense powder flow area (d) from upper smoke backflow district (c1) and lower smoke backflow district (c2), the temperature of mixed airflow is 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 mixes in time 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 in succession heated to ignition temperature, remain fast the pyrolytic gasification of coal dust, make fugitive constituent in coal fully separate out and burn;
Unburnt semicoke mixes and burns away with adjacent Secondary Air in time in burner hearth, and sufficient oxygen mixes in high-temperature region and can guarantee its abundant after-flame in time with coal dust semicoke; By catching fire step by step from inside to outside, the mode that oxygen is supplied with step by step, completes the first burning process of after-flame under high temperature oxidation stability atmosphere again under reducing atmosphere, realizes the decoupling burning that simultaneously reduces NOx and combustible discharge 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 Expired - Fee Related CN102620291B (en)

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