CN107152678B - A kind of enhancing shunts the pulverized coal decoupling combustor and combustion method of enrichment - Google Patents

A kind of enhancing shunts the pulverized coal decoupling combustor and combustion method of enrichment Download PDF

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CN107152678B
CN107152678B CN201610119466.2A CN201610119466A CN107152678B CN 107152678 B CN107152678 B CN 107152678B CN 201610119466 A CN201610119466 A CN 201610119466A CN 107152678 B CN107152678 B CN 107152678B
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flame holder
powder
flow
powder flame
collection
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CN107152678A (en
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郝江平
王菁
娄慧如
赵康
闫跃文
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Shanxi Sanhesheng Energy Saving Environmental Protection Technology Co Ltd
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Shanxi Sanhesheng Energy Saving Environmental Protection Technology Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D1/00Burners for combustion of pulverulent fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02Pneumatic feeding arrangements, i.e. by air blast

Abstract

The pulverized coal decoupling combustor of enrichment is shunted the invention discloses a kind of enhancing and based on the combustion method of this burner, the burner includes spout, deep or light split-flow baffles, upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder.The present invention collects powder flame holder by setting middle part, it can be in the case where same airflow space compression speed, reduce the collection powder inclination angle of inclined plane of each collection powder flame holder, to reduce the abrasion of collection powder flame holder, improve service life of equipment, it is also beneficial to mitigate the coal dust segregation of burner outlet and coking, improves the effect of decoupling burning.

Description

A kind of enhancing shunts the pulverized coal decoupling combustor and combustion method of enrichment
Technical field
The present invention relates to coal-dust combustion device fields, and in particular to it is a kind of enhancing shunt enrichment pulverized coal decoupling combustor and Combustion method.
Background technique
It is high-temperature oxygen-enriched to be conducive to improve efficiency of combustion in process of coal combustion, but will increase simultaneously raw in combustion process At NOx;Conversely, hypothermia and hypoxia is conducive to inhibit NOxGeneration, but coal dust less easy to burn out.Release Combustion Efficiency of Coal Powder with NOxThe coupled problem of discharge is the long-standing technological difficulties in coal dust firing field.
The coal of coal used in Power Plant in China, colm or low volatile occupies very big specific gravity, is using During such coal, largely there is combustion instability, breeze airflow ignition lag and efficiency of combustion is low the problems such as, give unit The safety of operation and economy bring very big challenge.Such coal is reducing NOxThe coupling emission problem faced when discharge It is even more serious.
Pre-stage test and engineer application are it was demonstrated that Burning Technique by Dispelling Coupling may be implemented to release the fly ash combustible material of coal burning With NOxCoupling discharge relationship, be to reduce fly ash combustible material and NO simultaneouslyxThe effective ways of discharge.The technology is by coal burning mistake Journey is divided into two stages, and the first stage, coal issues heat solution, gasification and burning in very high reducing atmosphere, makes full use of The pyrolysis of coal itself and gasification product are by fuel type NOxIt is converted into more stable N2;Second stage is created high-temperature oxygen-enriched but not Generate thermal NOxEnvironment, then ensure the abundant after-flame of coal.The conversion of fugitive constituent nitrogen is generated in burning initial stage pyrolytic gasification Process is that decoupling burning inhibits NOxThe critical process of discharge, the process mainly inside First air, Secondary Air mixing before compared with Small spatial dimension carries out, which is the fractional combustion belonged on microcosmic, can make full use of the higher pyrolytic gasification of reactivity Product is as reducing agent.
Currently, having developed a variety of decoupling burning devices according to decoupling burning principle and high temperature gases recirculating stable combustion technology.Specially Benefit application " a kind of pulverized coal decoupling combustor and combustion method of thick side staged " (number of patent application: 201120569682.X) is open Pulverized Coal Concentration and steady combustion function are integrated in one by a kind of pulverized coal decoupling combustor and coal dust decoupling burning method, the burner, The effect of decoupling burning not only can be improved, structure is also relatively simple, can dock with any one Pulverized Coal Concentration device, flexibly Property it is higher, to use different types of coal adaptability enhance.But although the burner makes wind powder obtain high separation, obtain super dense coal Powder air-flow and time dense air-flow two parts, but only two sides have locally carried out the separation of wind powder to dense side breeze airflow, and the wind isolated is all It concentrates and imports into time dense air-flow at middle part, so that the coal powder density of secondary dense air-flow reduces before relatively separating, reduce and inhibit NOxIt generates Efficiency;Secondly, super thick coal culm air-flow and time dense air-flow two parts are closely coupled, the mix faster in flowing is necessarily reduced Air-coal separating inhibits NOxThe effect of generation.Especially for meager coal and anthracite, volatile matter concentration is lower, and slower, reduction is precipitated Property the atmosphere time shorten be extremely be unfavorable for inhibit NOxIt generates.
Patent application " a kind of pulverized coal decoupling combustor and combustion method for shunting enrichment " (Authorization Notice No.: CN103062763B a kind of pulverized coal decoupling combustor for shunting enrichment) is disclosed, referring to Fig. 1, in conjunction with Pulverized Coal Concentration, decoupling combustion It burns and steady combustion function, compared with " a kind of pulverized coal decoupling combustor and coal dust decoupling burning method ", the design of deversoir blocks dense side Coal dust is flowed with air-flow to light powder side, has postponed the mixing of light powder air-flow and dense powder air-flow.In order to increase collection powder flame holder to gas The extruding of stream generates higher hyperconcetration effect, and the collection powder flame holder collection powder inclination angle of the burner is larger, and still, collection powder is steady The excessive inclination angle of flame device necessarily causes collection powder abrasion to accelerate, and reduces the service life of burner.In addition, the burner is dense Powder sidewind is squeezed by collection powder flame holder continuously to be turned to light powder lateral deviation, and the dense lateral deviation of burner outlet is caused to turn air-flow for part coal Powder brings light powder side into, to reduce the Pulverized Coal Concentration effect of breeze airflow, influences the efficiency of decoupling burning.
Summary of the invention
The purpose of the present invention is to provide the pulverized coal decoupling combustors that a kind of enhancing shunts enrichment, and the burner is by adding Middle part collection powder flame holder can reduce the collection powder inclination angle of collection powder flame holder, increase the volume energy-absorbing power of super dense air-flow, set to increase Standby service life and raising decoupling burning performance.In addition, passing through dense powder side diaphragm and deversoir leading before spout outlet Stream effect, reduces deflection of the dense sidewind after spout outlet to light powder side.
A kind of enhancing provided by the invention shunts the pulverized coal decoupling combustor of enrichment, the burning to achieve the goals above Device includes spout, deep or light split-flow baffles, upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder;
The deep or light split-flow baffles are set to the middle part of spout, and the shell of the upper and lower ends of deep or light split-flow baffles and spout Body connection;Spout is separated by deep or light split-flow baffles as two airflow channels of through-flow light sidewind and dense sidewind respectively;
The upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder are located at the channel one for leading to dense sidewind Side;The upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder entirety cross section are in flat taper, along air-flow side To front elevational sectional is small, and rear end section is big;The upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder and air-flow The vertical cross section in direction is by the lateral surface of orifice rim to the diminishing step structure in center;
The lateral surface of the upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder is connect with spout, upper collection Powder flame holder, the stepped side of medial surface of next part powder flame holder are opposite, and through-flow space is equipped between opposite medial surface; The through-flow space between upper collection powder flame holder, next part powder flame holder, the steady flame of middle part collection powder is arranged in the middle part collection powder flame holder The upper and lower stepped prism of device respectively with it is upper collection powder flame holder, next part powder flame holder the stepped side phase of medial surface It is right, through-flow space is respectively equipped between middle part collection powder flame holder and upper collection powder flame holder, next part powder flame holder;
Each ladder of the opposite side of the upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder Face is designed with deversoir close to deep or light split-flow baffles side;The deversoir is the rank for collecting powder flame holder compared with personal attendant along airflow direction The curved strip structure of tread and corresponding inclined-plane;One side wall of the deversoir is close to be connected to collection powder along its length The cascaded surface of flame holder and corresponding inclined-plane;Each deversoir stops the cascaded surface and corresponding inclined-plane of being close to collection powder flame holder Coal dust, and make it with the deep or light split-flow baffles side of air flow direction.
As an improvement, the section of the close collection powder flame holder of the deversoir increase direction side (far from it is deep or light shunt every Plate side) side wall be along airflow direction to collection powder flame holder section increase direction side tilt, will close to collection powder flame holder Direction side (far from deep or light split-flow baffles side) is increased in the section of the air-flow guiding collection powder flame holder on surface, due to deversoir cross To collection powder flame holder is summarized in the coal dust vertically collected, and by fraction in the middle part of vertically pressing to, further concentration is improved Close to the coal powder density of the breeze airflow of the inclined side wall side of collection powder flame holder prism and deversoir, keep the air-flow dense It shortens into as the more higher leveled super thick coal culm air-flow of coal powder density;The super ultra-concentrating powder air-flow is located at the exterior angle of flow cross-sectional simultaneously Portion forms smoke backflow in addition and increases air-flow boundary volume and inhales area after deversoir so that the air-flow be easier to volume inhale it is more High warm flue gas, thus for the unburnable coal of low-volatile, which can become the stabilization flame of kindling, substantially improve burning The steady combustion ability of device;The guiding role of deversoir can also be such that more coal dusts and the angle of light powder air current flow direction increase, and push away The late mixing of the two is conducive to the generation for inhibiting NOx.
Preferably, the deversoir of opposite collection powder flame holder is connected along the spout outlet side of airflow direction.The design Mode can reduce outlet end of the dense survey air-flow in spout and turn to light powder lateral deviation.
Preferably, collect and be disposed with to lateral separation on each cascaded surface and corresponding inclined-plane of the prism of powder flame holder Multiple deversoirs, the deversoir height collected on the same cascaded surface of the prism of powder flame holder are inconsistent, wherein close to light powder The deversoir height highest of side.Collect ground cloth in lateral separation on each cascaded surface and corresponding inclined-plane of the prism of powder flame holder Multiple deversoirs are equipped with, each deversoir can stop the coal dust for being close to the prism of collection powder flame holder with the deep or light shunting of air flow direction Partition side, so that concentration distribution presentation of the dense powder air-flow between each cascaded surface is apparent steps, while in each cascaded surface Concentration distribution it is more uniform.
Preferably, dense powder side diaphragm is provided in the airflow channel of the dense sidewind;The dense powder side water conservancy diversion every Spout of the plate in the side close to deep or light split-flow baffles of upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder goes out Mouth one end, the upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder are connected.
Preferably, the connection of the dense powder side diaphragm and middle part collection powder flame holder is tight;The dense powder side water conservancy diversion every Plate is only closely connect in spout outlet one end with upper collection powder flame holder, next part powder flame holder, close to spout entrance one end there are Gap.Be only capable of as a result, from spout entrance one end front of dense powder side diaphragm by the breeze airflow that collection powder flame holder squeezes and The top and the bottom of the spout entrance side of dense powder side diaphragm are deflected to light powder side;Change the shape of dense powder side diaphragm and to dense The dense assignment of traffic and flow direction for surveying breeze airflow can be changed in the guiding inclination angle of powder side.
Preferably, the nozzle shape uses the horn mouth of flaring.The nozzle shape uses the bell-mouth structure of air of flaring It is spread using air-flow to orifice rim and coal dust inertia makes to collect the breeze airflow enrichment between powder flame holder, so as to smaller Collection powder flame holder inclination angle under improve collection powder concentrated effect and reduce air-flow flow resistance.
Preferably, the middle part collection powder flame holder and upper and lower collection powder flame holder are in the end face close to spout outlet side Compare, middle part collection powder flame holder close to spout outlet side end face further from spout outlet side.The design method can make Volume smoking gas of the middle part collection powder flame holder in spout outlet side can protrude into spout, improve warm-up ability.
Preferably, pulverized coal ignition device can pass through middle part collection powder flame holder, close to spout outlet side end face into Row pulverized coal ignition.
As a further improvement, respectively collecting size dimension, shape and the rear end cross-sectional sizes along airflow direction of powder flame holder Can be different, it in this way can be steady with the collection powder concentrated effect of the opposite side of priority support a pair of collection powder flame holder and a pair of collection powder The smoke backflow ability at flame device rear portion.
As a further improvement, the deep or light split-flow baffles are to be in tilted layout, so that the shell of deep or light split-flow baffles and spout The channel for the dense sidewind that body surrounds is gradually increased along the actual internal area of air flow direction;Deep or light split-flow baffles can be to light sidewind It is oriented to, light sidewind is made to deviate dense sidewind flowing;
As a further improvement, the device of the invention can also be docked with other external Pulverized Coal Concentration devices, to realize Further concentration to the dense sidewind that external Pulverized Coal Concentration device generates, obtains the pulverized coal decoupling combustor of dense side enrichment again, Dense sidewind and light sidewind in the external Pulverized Coal Concentration the device dense side gas flow path through spout and described respectively Light side gas flow path, into hearth combustion.
It is described the present invention also provides a kind of a kind of combustion method of pulverized coal decoupling combustor for shunting enrichment based on enhancing Method the following steps are included:
1) after coal dust enters spout, when by upper, middle and lower collection powder flame holder positioned opposite to each other, due to collecting the steady flame of powder The concentration of the squeezing action on device inclined-plane, the breeze airflow of straight trip improves, and forms thick coal culm air-flow;The portion squeezed by collection powder flame holder Point air-flow is upper from spout entrance one end front of dense powder side diaphragm and the close spout entrance side of dense powder side diaphragm Lower part is deflected to light powder side;
Due to the squeezing action on collection powder flame holder inclined-plane in step 1), partial air is biased to middle part flowing, coal dust in spout Due to effect of inertia, the concentration of the breeze airflow of straight trip is improved, and forms thick coal culm air-flow.Due to setting for dense powder side diaphragm It sets, is only capable of leading from spout entrance one end front of dense powder side diaphragm and dense powder side by the fraction that collection powder flame holder squeezes The top and the bottom for flowing the close spout entrance side of partition are deflected to light powder side.
2) coal powder density and stream when the collection powder flame holder that coal dust is set gradually by upper, middle and lower, close to center in spout Speed is distributed in reduced staged.
In the step 2), when the collection powder flame holder that coal dust is set gradually by upper, middle and lower, by three collection powder flame holders The extruding of the forge piece of step type structure of rear end, the high air-flow of ladder are squeezed greatly, and the outer of spout outer housing is formed close in the channel Sidewind coal powder density is higher, flow velocity faster, coal powder density and flow velocity close to center in spout are in the staged accordingly reduced Distribution, the front end of collection powder flame holder make to form bigger reflux space on the outside of spout, and the hot fume amount to flow back from burner hearth is bigger, outside The intensity that side thick coal culm air-flow is heated is higher;The setting of middle part collection powder flame holder increases dense sidewind circumference, and volume inhales burner hearth The ability of high-temperature flue gas heating further increases.
Preferably, the step 1) further comprises following sub-step:
11) after breeze airflow flows through external Pulverized Coal Concentration device, it is divided into dense sidewind and light sidewind;Dense sidewind enters The dense side gas flow path of the spout, the partial air in the dense sidewind are biased to middle part in spout through dense powder side diaphragm Flowing, coal dust form super thick coal culm air-flow since effect of inertia, the concentration of the thick coal culm air-flow of straight trip further increase;It is squeezed It presses the air-flow distributed to carry part coal dust and forms time thick coal culm air-flow.
In above-mentioned steps, dense sidewind enters the dense side gas flow path of the spout, due to the steady flame of collection powder being oppositely arranged The squeezing action on the inclined-plane of device, the partial air in the dense sidewind are biased to middle part flowing in spout through dense powder side diaphragm, Coal dust forms super thick coal culm air-flow since effect of inertia, the concentration of the thick coal culm air-flow of straight trip further increase;It is extruded shunting Air-flow out carries part coal dust and forms time thick coal culm air-flow.
Preferably, the step 2) further comprises following sub-step:
21) deversoir 3 of sidewall slope increases the section of the air-flow guiding collection powder flame holder close to collection powder flame holder surface High direction side, deversoir laterally summarize collection powder flame holder and are vertically squeezing in the coal dust vertically collected, and by fraction To middle part, the coal dust of the breeze airflow close to the inclined side wall side of collection powder flame holder prism and deversoir is further increased Concentration makes air-flow concentration become the more higher leveled super thick coal culm air-flow of coal powder density;Simultaneously the super thick coal culm air-flow at For the stabilization flame of kindling;The sloped sidewall of deversoir increases the angle in spout outlet and light powder air current flow direction, in turn Postpone the mixing of the two.The boundary volume suction area of super thick coal culm air-flow is big in the step, and easily volume inhales more high warm flue gas, Stabilization flame as kindling.
22) super thick coal culm air-flow and super thick coal culm air-flow rapidly heat up, and fast pyrogenation, gasification occurs;Super thick coal culm gas After the volatile combustion of stream, gradually it is mixed and burned with secondary dense air-flow and light powder air-flow in succession.In the step, super thick coal culm air-flow It rapidly heats up with super thick coal culm air-flow, fast pyrogenation, gasification occurs, volatile matter nitrogen ratio greatly improves, super thick coal culm air-flow Oxygen content is extremely low, it is coal pyrolytic gasified after volatile matter in reducing substances it is more, thus volatile matter nitrogen is given birth to mostly in combustion At stable N2;After the volatile combustion of super thick coal culm air-flow, gradually it is mixed and burned with secondary dense air-flow and light powder air-flow in succession, by Coke in thick coal culm burns in succession, increases the consumption of oxygen, causes light powder air-flow and dense powder air-flow mixing after-combustion Still under Hypoxic habitats, while by the catalysis reduction of coke, thus coke nitrogen is converted into NOxRatio reduce.
Preferably, the method further includes following steps: through burner, the volatile matter nitrogen and coal of dense powder, light powder Powder coke nitrogen burning conversion is N2Afterwards, Secondary Air is replenished in time.The step can make coal dust that high-temperature oxygen-enriched reaction occur, and extend The burner hearth clean-burning time, so that abundant after-flame, reduces the content of fly ash combustible material, CO in flue gas, realize the solution of fine coal Coupling burning.
The outstanding feature of pulverized coal decoupling combustor provided by the invention and combustion method:
1, powder flame holder is collected by setting middle part, each collection powder can be reduced in the case where same airflow space compression speed The collection powder inclination angle of inclined plane of flame holder improves service life of equipment to reduce the abrasion of collection powder flame holder;Simultaneously as dense Setting middle part collects powder flame holder in the middle part of sidewind, the circumference area of dense powder air-flow can be greatly increased, to increase dense powder air-flow Volume inhales the heating efficiency of high-temperature flue gas;In addition, reducing the collection powder inclination angle of inclined plane of collection powder flame holder, it is also beneficial to mitigation burner and goes out The coal dust segregation and coking of mouth.
2, dense powder air-flow shunts concentration by collection powder flame holder and dense powder side diaphragm again, can make close burner hearth center More breeze airflows of side (to fiery side) reach super dense state.Since dense powder side diaphragm is to dense side thick coal culm stream Separate guide functions, it can reduce deflection of the dense sidewind in spout outlet to light powder side;Simultaneously as deep or light split-flow baffles pair The dense powder side diaphragm of light powder air-flow separates guide functions, and time dense air-flow is formed between light powder stream and dense powder stream, can To postpone the mixing of dense powder air-flow and light powder air-flow, to improve the effect of decoupling burning;
3, the present invention is by designing the phase that the shape of dense powder side diaphragm can be changed, be oriented to inclination angle and deversoir with air-flow To height dimension, the dense assignment of traffic for surveying breeze airflow can be changed and control deflection of the super thick coal culm air-flow to light powder side;
4, nozzle shape of the present invention uses flaring horn mouth, makes to collect between powder flame holder using Diffusion of gas stream and coal dust inertia Breeze airflow enrichment, be also beneficial to reduce collection powder flame holder inclination angle, reduce burner abrasion and flow resistance;
5, burner itself of the invention has good Pulverized Coal Concentration and warm-up ability, and bituminous coal can be not required to configure External Pulverized Coal Concentration device and be used alone, for direct-firing system, it is bigger than normal to low nitrogen burning that high load capacity primary air ratio can be improved Adverse effect.Coal fire retardant for low volatile, burner of the invention can be docked with external Pulverized Coal Concentration device, with into one Step improves the ability of Pulverized Coal Concentration, generates super thick coal culm air-flow.
Detailed description of the invention
Fig. 1 is the existing pulverized coal decoupling combustor structure front view for shunting enrichment;
Fig. 2 is the structure front view of pulverized coal decoupling combustor of the invention;
Fig. 3 is the structure overhead sectional view of pulverized coal decoupling combustor of the invention;
Fig. 4 is the structure right side view of pulverized coal decoupling combustor of the invention.
Attached drawing mark
1, spout;2, deep or light split-flow baffles;3, deversoir;4, dense powder side diaphragm;5, upper collection powder flame holder;6, middle part Collect powder flame holder;7, light sidewind;8, dense sidewind;9, upper collection powder flame holder;.
Specific embodiment
It the following is the embodiment of the present invention, be only used as explanation of the invention and not limit.
A kind of enhancing provided by the invention shunts the pulverized coal decoupling combustor of enrichment, and the burner includes spout 1, deep or light Split-flow baffles 2, upper collection powder flame holder 9, next part powder flame holder and middle part collection powder flame holder 6;
The deep or light split-flow baffles 2 are set to the middle part of spout 1, and the upper and lower ends of deep or light split-flow baffles 2 and spout 1 Outer housing connection;Spout 1 is separated by deep or light split-flow baffles 2 as two air-flows of through-flow light sidewind 7 and dense sidewind 8 respectively Channel;
The upper collection powder flame holder 9, next part powder flame holder 5 and middle part collection powder flame holder 6 are located at the channel for leading to dense sidewind 8 Side;The whole cross section of the upper collection powder flame holder 9, next part powder flame holder 5 and middle part collection powder flame holder 6 is in flat taper, edge Airflow direction, front elevational sectional is small, and rear end section is big;The upper collection powder flame holder 9, next part powder flame holder 5 and the steady flame of middle part collection powder The cross section vertical with airflow direction of device 6 is by the lateral surface at 1 edge of spout to the diminishing step structure in center;
The lateral surface of the upper collection powder flame holder 9, next part powder flame holder 5 and middle part collection powder flame holder 6 is connect with spout 1, The stepped side of medial surface of upper and lower collection powder flame holder 5 is opposite, and through-flow space is equipped between opposite medial surface;It is described The through-flow space between upper collection powder flame holder 9, next part powder flame holder 5, middle part collection powder flame holder is arranged in middle part collection powder flame holder 6 6 upper and lower stepped prism respectively with it is upper collection powder flame holder 9, next part powder flame holder 5 the stepped side phase of medial surface It is right, through-flow space is respectively equipped between middle part collection powder flame holder 6 and upper collection powder flame holder 9, next part powder flame holder 5;
Each cascaded surface of the opposite side of each collection powder flame holder is designed with shunting close to deep or light 2 side of split-flow baffles Weir 3;The deversoir 3 is longer along airflow direction, curved with the cascaded surface of collection powder flame holder and corresponding inclined-plane in airflow direction Bent strip structure;One side wall of each deversoir 3 is close to be connected to the cascaded surface of collection powder flame holder along its length With corresponding inclined-plane;Each deversoir 3 can stop be close to collection powder flame holder cascaded surface and corresponding inclined-plane coal dust with Deep or light 2 side of split-flow baffles of air flow direction.
As an improvement, the section of the close collection powder flame holder of the deversoir 3 increase direction side (far from it is deep or light shunt every 2 side of plate) side wall be along airflow direction to collection powder flame holder section increase direction side tilt, will close to collection powder flame holder Direction side (far from deep or light 2 side of split-flow baffles) is increased in the section of the air-flow guiding collection powder flame holder on surface, due to deversoir 3 Collection powder flame holder is laterally summarized in the coal dust vertically collected, and fraction is vertically being pressed into middle part, further concentration mentions The coal powder density of the high breeze airflow close to the inclined side wall side of collection powder flame holder prism and deversoir 3, makes the gas Stream concentration becomes the more higher leveled super thick coal culm air-flow of coal powder density;The super ultra-concentrating powder air-flow is located at flow cross-sectional simultaneously External angle forms smoke backflow and increases air-flow boundary volume and inhale area, in addition so that the air-flow is easier to volume and inhales more after deversoir 3 More high warm flue gas, thus for the unburnable coal of low-volatile, which can become the stabilization flame of kindling, substantially improve The steady combustion ability of burner;The guiding role of deversoir 3 can also be such that more coal dusts and the angle of light powder air current flow direction increase Greatly, the mixing for having postponed the two is conducive to the generation for inhibiting NOx;
As an improvement, the deversoir 3 of the opposite collection powder flame holder is connected along the spout outlet side of airflow direction, Turned with reducing outlet end of the dense survey air-flow in spout to light powder lateral deviation;
As an improvement, being arranged to lateral separation on each cascaded surface and corresponding inclined-plane of the prism of collection powder flame holder There are multiple deversoirs 3, each deversoir 3 can stop the coal dust for being close to the prism of collection powder flame holder with the deep or light shunting of air flow direction 2 side of partition, so that concentration distribution presentation of the dense powder air-flow between each cascaded surface is apparent steps, while in each cascaded surface Concentration distribution it is more uniform;3 height of deversoir collected on the same cascaded surface of the prism of powder flame holder is inconsistent, In, the 3 height highest of deversoir close to light powder side;
As an improvement, being provided with dense powder side diaphragm 4 in the airflow channel of the dense sidewind 8;It leads the dense powder side Partition 4 is flowed in the spout outlet of the side close to deep or light split-flow baffles 2 of collection powder flame holder 5 above and below and middle part collection powder flame holder 6 One end connects the upper and lower collection powder flame holder 5 and middle part collection powder flame holder 6;
As an improvement, the connection of the dense powder side diaphragm 4 and middle part collection powder flame holder 6 is tight;It leads the dense powder side Stream partition 4 is only closely connect in spout outlet one end with upper and lower collection powder flame holder 5, and in close spout entrance one end, there are gaps; Spout entrance one end front and dense powder from dense powder side diaphragm 4 are only capable of by the breeze airflow that collection powder flame holder squeezes as a result, The top and the bottom of the spout entrance side of side diaphragm 4 are deflected to light powder side;Change the shape of dense powder side diaphragm 4 and to dense powder The dense assignment of traffic and flow direction for surveying breeze airflow can be changed in the guiding inclination angle of side;
As an improvement, 1 shape of spout use flaring horn mouth, using air-flow to orifice rim spread and coal dust Inertia makes to collect the breeze airflow enrichment between powder flame holder, dense so as to improve collection powder under the inclination angle of lesser collection powder flame holder Contracting effect and reduction air-flow flow resistance;
As an improvement, the middle part collection powder flame holder 6 and upper and lower collection powder flame holder 5 are close to spout outlet side End face is compared, middle part collection powder flame holder 6 close to spout outlet side end face further from spout outlet side so that middle part collection powder Volume smoking gas of the flame holder 6 in spout outlet side can protrude into spout, improve warm-up ability;
As a further improvement, pulverized coal ignition device can pass through middle part collection powder flame holder 6, close to spout outlet side End face carry out pulverized coal ignition;
As a further improvement, respectively collecting size dimension, shape and the rear end cross-sectional sizes along airflow direction of powder flame holder Can be different, it in this way can be steady with the collection powder concentrated effect of the opposite side of priority support a pair of collection powder flame holder and a pair of collection powder The smoke backflow ability at flame device rear portion.
As a further improvement, the deep or light split-flow baffles 2 are to be in tilted layout, so that deep or light split-flow baffles 2 and spout 1 The channel for the dense sidewind 8 that shell surrounds is gradually increased along the actual internal area of air flow direction;Deep or light split-flow baffles 2 can be to light side Air-flow 7 is oriented to, and so that light sidewind 7 is deviateed dense sidewind 8 and is flowed;
As a further improvement, the device of the invention can also be docked with other external Pulverized Coal Concentration devices, to realize Further concentration to the dense sidewind that external Pulverized Coal Concentration device generates, obtains the pulverized coal decoupling combustor of dense side enrichment again, Dense sidewind and light sidewind in the external Pulverized Coal Concentration the device dense side gas flow path through spout 1 and described respectively Light side gas flow path, into hearth combustion.
The present invention also provides a kind of combustion method of pulverized coal decoupling combustor that enrichment is shunted based on above-mentioned enhancing, institutes State method the following steps are included:
1) after coal dust enters spout 1, when by upper, middle and lower collection powder flame holder positioned opposite to each other, due to collecting the steady flame of powder The squeezing action on device inclined-plane, partial air are biased to middle part flowing in spout, coal dust due to effect of inertia, the breeze airflow of straight trip Concentration improves, and forms thick coal culm air-flow.Due to the setting of dense powder side diaphragm 4, the fraction squeezed by collection powder flame holder It is only capable of from the upper of the close spout entrance side of spout entrance one end front and dense powder side diaphragm 4 of dense powder side diaphragm 4 Lower part is deflected to light powder side.
2) when the collection powder flame holder that coal dust is set gradually by upper, middle and lower, the step type of powder flame holder rear end is collected by three The extruding of structure, the high air-flow of ladder are squeezed greatly, and the outer sidewind coal dust that spout outer housing is formed close in the channel is dense Faster, coal powder density and flow velocity close to center in spout are in the staged distribution accordingly reduced for Du Genggao, flow velocity, collect the steady flame of powder The front end of device makes to form bigger reflux space on the outside of spout, and the hot fume amount to flow back from burner hearth is bigger, outside thick coal culm air-flow The intensity heated is higher;The setting of middle part collection powder flame holder increases dense sidewind circumference, and volume inhales the heating of burner hearth high-temperature flue gas Ability further increase.
As a further preference, the step 1) and 2) include following sub-step:
11) after breeze airflow flows through external Pulverized Coal Concentration device, it is divided into dense sidewind and light sidewind;Dense sidewind enters The dense side gas flow path of the spout 1, due to the squeezing action on the inclined-plane for the collection powder flame holder being oppositely arranged, in the dense sidewind Partial air through dense powder side diaphragm, be biased to middle part flowing in spout, coal dust is due to effect of inertia, the thick coal culm gas of straight trip The concentration of stream further increases, and forms super thick coal culm air-flow;It is extruded the air-flow carrying part coal dust distributed and forms time dense coal Powder air-flow.
21) deversoir 3 of sidewall slope increases the section of the air-flow guiding collection powder flame holder close to collection powder flame holder surface High direction side, deversoir laterally summarize collection powder flame holder and are vertically squeezing in the coal dust vertically collected, and by fraction To middle part, further concentration improves the breeze airflow close to the inclined side wall side of collection powder flame holder prism and deversoir Coal powder density, make the air-flow concentration become the more higher leveled super thick coal culm air-flow of coal powder density;The super thick coal culm simultaneously The boundary volume suction area of air-flow is big, and easily volume inhales more high warm flue gas, becomes the stabilization flame of kindling;The inclined side of deversoir Both wall turns more coal dusts to dense lateral deviation, increase the angle in spout outlet and light powder air current flow direction, and then postpone Mixing;
22) super thick coal culm air-flow and super thick coal culm air-flow rapidly heat up, and fast pyrogenation, gasification, volatile matter nitrogen ratio occurs Example greatly improve, the oxygen content of super thick coal culm air-flow is extremely low, it is coal pyrolytic gasified after volatile matter in reducing substances it is more, thus Volatile matter nitrogen generates stable N mostly in combustion process2;After the volatile combustion of super thick coal culm air-flow, in succession with secondary dense air-flow It is gradually mixed and burned with light powder air-flow, since the coke in thick coal culm burns in succession, the consumption of oxygen is increased, light powder is caused Air-flow and dense powder air-flow mixing after-combustion are still under Hypoxic habitats, while by the catalysis reduction of coke, thus coke nitrogen It is converted into NOxRatio reduce.
The method further includes following steps: through burner, the volatile matter nitrogen and coal dust coke nitrogen of dense powder, light powder Burning conversion is N2Afterwards, Secondary Air is replenished in time, allows coal dust that high-temperature oxygen-enriched reaction occurs, extends when burner hearth is clean-burning Between, so that abundant after-flame, reduces the content of fly ash combustible material, CO in flue gas, realizes the decoupling burning of fine coal.

Claims (10)

1. a kind of enhancing shunts the pulverized coal decoupling combustor of enrichment, including spout, deep or light split-flow baffles, upper collection powder flame holder, under Collect powder flame holder and middle part collection powder flame holder, it is characterised in that:
The deep or light split-flow baffles are set to the middle part of spout, and the outer housing of the upper and lower ends of deep or light split-flow baffles and spout connects It connects;Spout is separated by deep or light split-flow baffles as two airflow channels of through-flow light sidewind and dense sidewind respectively;
The upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder are located at the channel side for leading to dense sidewind;Institute The whole cross section for stating collection powder flame holder, next part powder flame holder and middle part collection powder flame holder is in flat taper, preceding along airflow direction End section is small, and rear end section is big;The upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder and airflow direction hang down Straight cross section is by the lateral surface of orifice rim to the diminishing step structure in center;
The lateral surface of the upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder is connect with spout, and upper collection powder is steady Flame device, the stepped side of medial surface of next part powder flame holder are opposite, and through-flow space is equipped between opposite medial surface;It is described The through-flow space between upper collection powder flame holder, next part powder flame holder is arranged in middle part collection powder flame holder, middle part collection powder flame holder Upper and lower stepped prism is opposite with upper collection powder flame holder, the stepped side of medial surface of next part powder flame holder respectively, in Through-flow space is respectively equipped between portion's collection powder flame holder and upper collection powder flame holder, next part powder flame holder;
Each cascaded surface of the opposite side of the upper collection powder flame holder, next part powder flame holder and middle part collection powder flame holder leans on Nearly deep or light split-flow baffles side is designed with deversoir;The deversoir is the cascaded surface for collecting powder flame holder compared with personal attendant along airflow direction With the curved strip structure in corresponding inclined-plane;One side wall of the deversoir is close to be connected to the collection steady flame of powder along its length The cascaded surface of device and corresponding inclined-plane;Each deversoir stops to be close to the cascaded surface of collection powder flame holder and the coal on corresponding inclined-plane Powder, and make it with the deep or light split-flow baffles side of air flow direction.
2. the pulverized coal decoupling combustor that enhancing according to claim 1 shunts enrichment, which is characterized in that opposite collection powder is steady The deversoir of flame device is connected along the spout outlet side of airflow direction.
3. the pulverized coal decoupling combustor that enhancing according to claim 1 shunts enrichment, which is characterized in that collection powder flame holder It is disposed with to lateral separation multiple deversoirs on each cascaded surface and corresponding inclined-plane of prism, collects the oblique side of powder flame holder Deversoir height on the same cascaded surface in face is inconsistent, wherein the deversoir height highest close to light powder side.
4. the pulverized coal decoupling combustor that enhancing according to claim 1 shunts enrichment, which is characterized in that the dense sidewind Airflow channel in be provided with dense powder side diaphragm;The dense powder side diaphragm is in upper collection powder flame holder, the steady flame of next part powder Spout outlet one end of the side close to deep or light split-flow baffles of device and middle part collection powder flame holder, by the upper collection powder flame holder, Next part powder flame holder and middle part collection powder flame holder connect.
5. the pulverized coal decoupling combustor that enhancing according to claim 4 shunts enrichment, which is characterized in that lead the dense powder side The connection for flowing partition and middle part collection powder flame holder is tight;The dense powder side diaphragm and upper collection powder flame holder, the steady flame of next part powder Device is only closely connected in spout outlet one end, and in close spout entrance one end, there are gaps.
6. the pulverized coal decoupling combustor that enhancing according to claim 1 shunts enrichment, which is characterized in that the nozzle shape Using the horn mouth of flaring.
7. the pulverized coal decoupling combustor that enhancing according to claim 1 shunts enrichment, which is characterized in that the middle part collection Powder flame holder is compared with collection powder flame holder above and below is in the end face close to spout outlet side, and middle part collection powder flame holder is close to spout The end face of side is exported further from spout outlet side.
8. shunting the method for the pulverized coal decoupling combustor burning of enrichment based on the described in any item enhancings of claim 1-7, comprising:
1) after coal dust enters spout, when by upper, middle and lower collection powder flame holder positioned opposite to each other, since collection powder flame holder is oblique The concentration of the squeezing action in face, the breeze airflow of straight trip improves, and forms thick coal culm air-flow;The part gas squeezed by collection powder flame holder Flow the top and the bottom from the close spout entrance side of spout entrance one end front and dense powder side diaphragm of dense powder side diaphragm It deflects to light powder side;
2) when the collection powder flame holder that coal dust is set gradually by upper, middle and lower, the forge piece of step type structure of powder flame holder rear end is collected by three Extruding, the high air-flow of ladder is squeezed greatly, and the outer sidewind coal powder density of spout outer housing is formed close in the channel more Faster, coal powder density and flow velocity close to center in spout are in the staged distribution accordingly reduced to high, flow velocity.
9. according to the method described in claim 8, it is characterized in that, the step 1) further comprises following sub-step:
11) after breeze airflow flows through external Pulverized Coal Concentration device, it is divided into dense sidewind and light sidewind;Described in dense sidewind enters The dense side gas flow path of spout, the partial air in the dense sidewind are biased to middle part flowing in spout through dense powder side diaphragm, Coal dust forms super thick coal culm air-flow since effect of inertia, the concentration of the thick coal culm air-flow of straight trip further increase;It is extruded shunting Air-flow out carries part coal dust and forms time thick coal culm air-flow.
10. according to the method described in claim 8, it is characterized in that, the step 2) further comprises following sub-step:
21) direction is increased in the section of the air-flow guiding collection powder flame holder close to collection powder flame holder surface by the deversoir of sidewall slope Side, deversoir laterally summarize collection powder flame holder in the coal dust vertically collected, and fraction are vertically being pressed against middle part, The coal powder density for further increasing the breeze airflow close to the inclined side wall side of collection powder flame holder prism and deversoir, makes Air-flow concentration becomes the more higher leveled super thick coal culm air-flow of coal powder density;The super thick coal culm air-flow becomes kindling simultaneously Stablize flame;Both the sloped sidewall of deversoir increases the angle in spout outlet and light powder air current flow direction, and then postpone Mixing;
22) super thick coal culm air-flow and super thick coal culm air-flow rapidly heat up, and fast pyrogenation, gasification occurs;Super thick coal culm air-flow After volatile combustion, gradually it is mixed and burned with secondary dense air-flow and light powder air-flow in succession;
Preferably, the method further includes following steps: through burner, dense powder, the volatile matter nitrogen of light powder and coal dust are burnt Charcoal nitrogen burning conversion is N2Afterwards, Secondary Air is replenished in time.
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