CN103062763B - Distributary thickening coal decoupling burner and burning method - Google Patents
Distributary thickening coal decoupling burner and burning method Download PDFInfo
- Publication number
- CN103062763B CN103062763B CN201210587100.XA CN201210587100A CN103062763B CN 103062763 B CN103062763 B CN 103062763B CN 201210587100 A CN201210587100 A CN 201210587100A CN 103062763 B CN103062763 B CN 103062763B
- Authority
- CN
- China
- Prior art keywords
- flow
- air
- flame holder
- coal
- collection powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The invention discloses a distributary thickening braize decoupling burner which comprises a nozzle, a distributary separation plate and more than two powder collecting flame holders. The distributary separation plate is slantly arranged on the middle portion of the nozzle, and two ends of the distributary separation plate are connected with an outer casing of the nozzle. The nozzle is divided into a thin side airflow channel and a thick side airflow channel, circulation section areas of the thick side airflow channel along the airflow direction gradually increase, and the powder collecting flame holders are located on the side of the thick side airflow channel. Back end cross sections of the powder collecting flame holders are of step-shaped structures which are gradually reduced from the edge of the nozzle to the center, and a deversoir is arranged on each step. The distributary thickening braize decoupling burner can delay mixing of thin powder airflow and thick powder airflow, improves decoupling burning effects, and has the advantages of being simple in structure, easy to maintain, capable of jointing with any braize concentration device, high in flexibility and strong in adaptability of different furnace profiles and different burned coal types and the like.
Description
Technical field
The present invention relates to coal-dust combustion device field, be specifically related to a kind of coal dust decoupling burning device and the combustion method of shunting enrichment.
Background technology
In the practical application of coal dust firing, along with the ignition temperature of coal air mixture at combustion phases and the raising of oxygen concentration, coal dust is quick, abundant after-flame more easily, in flue gas, the content of fly ash combustible material (uncompleted burned carbon and CO) reduces, but the simultaneously high-temperature oxygen-enriched NO that can make again to generate in combustion process
xsignificantly improve; On the other hand, coal air mixture suppresses nitrogen oxide NO in the ignition temperature of combustion phases and oxygen concentration more low being more conducive to
xgenerate, but coal dust more not easily after-flame.Thus, fly ash combustible material and the NO of coal dust firing is removed
xcoupling emission problem be long-standing technological difficulties in combustion technology.
Burning Technique by Dispelling Coupling can realize the fly ash combustible material and the NO that remove coal burning
xcoupling discharge relation, be reduce fly ash combustible material and NO simultaneously
xthe effective ways of discharge.Its mechanism is: coal burning process is divided into two stages, the first stage, coal issues heat-dissipating solution, gasification and burning in very high reducing atmosphere, makes full use of 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.
Decoupling burning suppresses NO
xthe critical process of discharge, in the conversion process of the fugitive constituent nitrogen that burning initial stage pyrolytic gasification produces, the less spatial dimension of this process mainly before First air inside, Secondary Air mixing is carried out, and namely starts the after-flame stage after First air mixes with Secondary Air.This process is the fractional combustion belonged on microcosmic, and mechanism is different from Researched of Air Staging Combustion Burning Pulverized Coal macroscopically, and the reducing agent of decoupling burning takes full advantage of pyrolytic gasification product, and reactivity is higher.
At present, multiple decoupling burning device has been developed according to decoupling burning principle, patent " a kind of coal dust decoupling burning device of dense side classification and combustion method " (Chinese Patent Application No.: 201120569682.X) discloses a kind of coal dust decoupling burning device, as shown in Figure 1, it comprises spout 1, split-flow baffles 2 and collection powder flame holder 3 to this burner structure schematic diagram; Its by Pulverized Coal Concentration with surely fire function and is integrated in one, not only can improve the effect of decoupling burning, structure is also comparatively simple, and can dock with any one Pulverized Coal Concentration device, flexibility is higher, to the adaptability enhancing using Coal rank.But this burner is some deficiency still, such as, after dense side breeze airflow flows through collection powder flame holder, although make wind powder be separated further, obtain super thick coal culm air-flow and time thick coal culm air-flow two parts, but dense side breeze airflow has only carried out the separation of wind powder in local, both sides, isolated wind is all also concentrated and is imported in the secondary thick coal culm air-flow at middle part, make the coal powder density of time thick coal culm air-flow comparatively be separated front reduction, be obviously unfavorable for suppressing NO
xgenerate; Secondly, super thick coal culm air-flow and time thick coal culm air-flow two parts do not separate flowing, but are closely connected, mix faster in flowing, must reduce again air-coal separating and suppress NO
xthe effect generated.In addition, the dense powder side of this burner and light powder lateral extent are also comparatively near, and dense powder air-flow mixes also very fast with light powder air-flow.Particularly for meager coal and anthracite, volatile matter concentration is lower, separates out comparatively slow, and reducing atmosphere time shorten is extremely unfavorable for suppressing NO
xgenerate.Also have, when breeze airflow flows through collection powder flame holder, the surface of powder flame holder is mostly concentrated on by the coal dust that collection powder flame holder is collected, along with air-flow be squeezed open flowing to side direction and dense powder flow separation time, can the coal dust that part is collected be taken to low concentration region, thus reduce the effect that collection powder flame holder is separated wind powder.
Summary of the invention
The object of the present invention is to provide a kind of coal dust decoupling burning device shunting enrichment, this burner is by separating flowing by fraction in breeze airflow and the coal dust collected, increase the coal powder density of breeze airflow, not only Pulverized Coal Concentration effective, dense powder air-flow firing rate is fast, and postponed the mixing of dense powder air-flow and light powder air-flow, structure also simplifies further, and performance is promoted further.
A kind of coal dust decoupling burning device shunting enrichment provided by the invention to achieve these goals, described burner comprises spout 1, split-flow baffles 2 and is no less than the collection powder flame holder 3 of two.Wherein, split-flow baffles 2 is obliquely installed the middle part in spout 1, and the two ends up and down of split-flow baffles 2 (namely perpendicular to the installation end of airflow direction) are connected with the shell body of spout 1; Spout 1 separates two gas channels for the through-flow light sidewind 5 of difference and dense sidewind 6 by split-flow baffles 2.Along airflow direction, collection powder flame holder 3 rear end cross section be by spout 1 edge to center diminishing step structure.
Described collection powder flame holder 3 is positioned at the passage side of logical dense sidewind 6; Described split-flow baffles 2 is for being in tilted layout, and the passage of the dense sidewind 6 that split-flow baffles 2 is surrounded with the housing of spout 1 increases gradually along the actual internal area of air flow direction; Split-flow baffles 2 can lead to light sidewind 5, makes light sidewind 5 depart from dense sidewind 6 and flows, the mixing of both postponements.
Preferably, described split-flow baffles 2 leaves distance, to increase the distance of high temperature gases recirculating along the rear end of airflow direction apart from the rear end of spout shell body; Split-flow baffles 2 is greater than front end along the rear end area of section of airflow direction, and after end section be that waveform etc. is irregularly shaped, to increase the capacity of returns of burner hearth high-temperature flue gas, and increase the contact area of breeze airflow and burner hearth high-temperature flue gas, improve flue gas to the firing rate of air-flow.
When breeze airflow flows through collection powder flame holder, owing to collecting the ladder-type structure of powder flame holder rear end, air-flow is squeezed deflection, the coal dust larger with inertia is shunted, formed in this passage higher near the outer sidewind coal powder density of spout shell body, flow velocity is faster, in spout, the coal powder density at center and flow velocity be that the staged of corresponding reduction distributes; Because the front end of collection powder flame holder forms larger backflow space in outside, larger from the heat smoke amount of burner hearth backflow, and outside surpass thick coal culm air-flow more easily and heat smoke contact, thus the intensity that heated of the super thick coal culm air-flow in outside is higher, pulverized coal pyrolysis gasify and burning velocity higher.
Preferably, the number of described collection powder flame holder 3 is two, and the overall cross section of this collection powder flame holder 3 is flat taper, and along airflow direction, front elevational sectional is little, and rear end section is large; The lateral surface of two collection powder flame holders 3 is connected with spout 1, and medial surface is near split-flow baffles 2; The prism of two collection powder flame holders 3 is relative, is provided with through-flow space between prism; Two collection powder flame holders 3 leave distance along the rear end of airflow direction apart from the rear end of spout shell body, to increase the distance of collection powder flame holder 3 rear portion high temperature gases recirculating.
As the another improvement of such scheme, two collection powder flame holders 3 can not be identical along the rear end of airflow direction apart from the rear end distance of spout shell body, like this can the smoke backflow ability at larger collection powder flame holder 3 rear portion of the rear end distance of priority support rear end apart from spout shell body, and avoid another collection powder flame holder 3 rear portion to produce coking at spout.
As the another improvement of such scheme, the size dimension of two collection powder flame holders 3, shape and the rear end cross-sectional sizes along airflow direction can be different, like this can the collection powder concentrated effect of priority support one larger-size collection powder flame holder 3 prism and the smoke backflow ability at its rear portion.
As the another improvement of such scheme, each cascaded surface of the prism of collection powder flame holder 3 is provided with deversoir 4 near split-flow baffles 2 side; Described deversoir 4 is strip structure that is longer along airflow direction, that bend with the cascaded surface and corresponding inclined-plane that collect powder flame holder 3 at airflow direction; A sidewall of described each deversoir 4 is close to the cascaded surface and corresponding inclined-plane that are connected to collection powder flame holder 3 along its length; Described each deversoir 4 can stop that the coal dust of the cascaded surface and corresponding inclined-plane being close to collection powder flame holder 3 is with air flow direction split-flow baffles 2 side.
As the another improvement of such scheme, the sidewall increasing side, direction (away from split-flow baffles 2 side) near the cross section collecting powder flame holder 3 of described deversoir 4 is increase direction lopsidedness along airflow direction to the cross section of collection powder flame holder 3, side, direction (away from split-flow baffles 2 side) is increased in the cross section of the air-flow guiding collection powder flame holder 3 pressing close to collect powder flame holder 3 surface, because deversoir 4 laterally summarizes collection powder flame holder 3 at the vertical coal dust collected, and fraction is vertically being pressed to middle part, the concentrated coal powder density that improve the breeze airflow of the sidewall side of the inclination of close collection powder flame holder 3 prism and deversoir 4 further, this air-flow is concentrated and becomes the more higher leveled super thick coal culm air-flow of coal powder density, this super ultra-concentrating powder air-flow is positioned at the external angle of flow cross-sectional simultaneously, in addition form smoke backflow and increase air-flow border after deversoir 4 and entrainment area, this air-flow is made more easily to entrainment more high-temperature hot flue gas, thus for the unburnable coal of low-volatile, this air-flow can become stabilizing the flame of catching fire, and greatly improves the steady combustion ability of burner, the guide effect of deversoir 4 also can make the angle in more coal dust and light powder air current flow direction increase, and has postponed the mixing of the two, is conducive to the generation suppressing NOx.As the another improvement of such scheme, each cascaded surface of the prism of collection powder flame holder 3 and corresponding inclined-plane are furnished with multiple deversoir 4 to lateral separation, each deversoir 4 can stop that the coal dust of the prism being close to collection powder flame holder 3 is with air flow direction split-flow baffles 2 side, make the CONCENTRATION DISTRIBUTION of dense powder air-flow between each cascaded surface present significantly steps, the CONCENTRATION DISTRIBUTION simultaneously in each cascaded surface is more even; Because the volatile content of the coal of high-volatile is high, pyrolysis is separated out fast, do not need the breeze airflow of super concentration just can form strong reducing property combustion atmosphere at the burning initial stage, initial stage of simultaneously burning have appropriate oxidation reaction could realize initial oxidation after the effect of decoupling burning of reducing, thus the program is more suitable for the coal of high-volatile.
Present invention also offers a kind of based on a kind of combustion method shunting the coal dust decoupling burning device of enrichment, said method comprising the steps of:
1), after coal dust enters spout 1, through a pair collection powder flame holder be oppositely arranged, due to the squeezing action on inclined-plane, middle part flowing in air deflection spout, coal dust is due to effect of inertia, and the concentration of the breeze airflow of craspedodrome improves, and forms thick coal culm air-flow.
2) the collection powder flame holder of coal dust through being oppositely arranged, due to the ladder-type structure of this pair collection powder flame holder rear end, the air-flow that ladder is high is squeezed greatly, in this passage, formation is higher near the outer sidewind coal powder density of spout shell body, flow velocity is faster, the coal powder density at center and flow velocity be that the staged of corresponding reduction distributes in the spout, the front end of this pair collection powder flame holder forms larger backflow space in outside, larger from the heat smoke amount of burner hearth backflow, the intensity that outside thick coal culm air-flow is heated is higher.
As preferably, device of the present invention can also dock with other Pulverized Coal Concentration devices, thus realize concentrating further coal dust, obtain the coal dust decoupling burning device of dense side enrichment again, dense sidewind 6 in described coal dust and light sidewind 5 through dense powder passage and the light powder passage of spout 1, enter hearth combustion respectively.
As further preferred, described step 1) and 2) comprise following sub-step:
11), after breeze airflow flows through outside Pulverized Coal Concentration device, dense sidewind and light sidewind is divided into; Dense sidewind enters the dense side gas flow path of described spout 1, due to the squeezing action on the inclined-plane of collection powder flame holder be oppositely arranged, middle part flowing in partial air deflection spout in this dense sidewind, coal dust is due to effect of inertia, the concentration of the thick coal culm air-flow of keeping straight on improves further, forms super thick coal culm air-flow; Be extruded the air-flow distributed to carry part coal dust and form time thick coal culm air-flow.
21) side, direction is increased in the cross section of the air-flow guiding collection powder flame holder pressing close to collect powder flame holder surface by the deversoir of sidewall slope, deversoir laterally summarizes collection powder flame holder 3 at the vertical coal dust collected, and fraction is vertically being pressed to middle part, the concentrated coal powder density that improve the breeze airflow of the sidewall side of the inclination of close collection powder flame holder 3 prism and deversoir further, this air-flow is concentrated becomes the more higher leveled super thick coal culm air-flow of coal powder density; To entrainment area large on the border of this super thick coal culm air-flow simultaneously, easily entrainments more high-temperature hot flue gas, becomes stabilizing the flame of catching fire; The sloped sidewall of deversoir makes the angle in more coal dust and light powder air current flow direction increase, and then the mixing both postponing.
22) super thick coal culm air-flow and super thick coal culm air-flow heat up rapidly, super thick coal culm generation fast pyrogenation, gasification, volatile matter nitrogen ratio significantly improves, the oxygen content of super thick coal culm air-flow is extremely low, in volatile matter after coal pyrolytic gasified, reducing substances is many, and thus volatile matter nitrogen generates stable N mostly in combustion
2; After the volatile combustion of ultra-concentrating powder air-flow, in succession with secondary dense powder air-flow and the progressively mixed combustion of light powder air-flow, because the coke in thick coal culm burns in succession, the consumption of oxygen is increased, under causing light powder air-flow to be still in Hypoxic habitats with dense powder air-flow mixing after-combustion, simultaneously by the catalytic reduction effect of coke, thus coke nitrogen is converted into NO
xratio very low.
Described method is further comprising the steps: through burner, and volatile matter nitrogen and the coal dust coke nitrogen burning conversion of dense powder, light powder are N
2after, supplement Secondary Air in time, allow coal dust that high-temperature oxygen-enriched reaction occurs, extend in the burner hearth clean-burning time, thus abundant after-flame, reduce the content of fly ash combustible material, CO in flue gas, achieve the decoupling burning of fine coal.
The outstanding feature of coal dust decoupling burning device provided by the invention and combustion method:
1, the collection powder flame holder that all passes through of dense powder air-flow is shunted concentrated again, and the more breeze airflow near burner hearth side can be made to reach super dense state.Due to being in tilted layout of split-flow baffles, the air-flow that dense sidewind is distributed can be partial to the spatial flow of light powder side, namely adds the effect that dense crosswind powder is separated, also reduces the pressure drop of spout; Meanwhile, because split-flow baffles is extruded the yaw motion of air-flow to light powder side to the water conservancy diversion of light powder air-flow and dense side, the mixing of light powder air-flow and dense powder air-flow can be postponed, thus improve the effect of decoupling burning.
2, the deversoir that is provided with of each cascaded surface of collection powder flame holder of the present invention, can stop to go out through inertial separation, be close to the coal dust of collection powder flame holder prism with the light powder side of air flow direction, thus realize the shunting of wind powder, improve the concentration that dense side surpasses the coal dust of thick coal culm air-flow.
Deversoir 4 away from the sidewall of split-flow baffles 2 side along airflow direction to the lopsidedness away from split-flow baffles 2, laterally summarize collection powder flame holder 3 at the vertical coal dust collected, further increase by the coal powder density of the close deversoir 4 of transverse shear stress with the breeze airflow of collection side, powder flame holder 3 inclined-plane, this super dense air-flow is concentrated becomes the super thick coal culm air-flow of the higher one-level of coal powder density; This dense powder air-flow is positioned at the external angle of flow cross-sectional simultaneously, in addition form smoke backflow and increase air-flow border after deversoir 4 and entrainment area, this air-flow is made more easily to entrainment more high-temperature hot flue gas, thus for the unburnable coal of low-volatile, this air-flow can become stabilizing the flame of catching fire, and greatly improves the steady combustion ability of burner; The guide effect of deversoir 4 also can make more coal dust and light powder flow reversal, has postponed the mixing of the two, is conducive to suppressing NO
xgeneration.
Each cascaded surface of collection powder flame holder also can be furnished with multiple deversoir 4 in compartment of terrain, the CONCENTRATION DISTRIBUTION of dense powder air-flow between each cascaded surface can be made to present significantly steps, CONCENTRATION DISTRIBUTION simultaneously in each cascaded surface is more even, coal for high-volatile is more suitable, this is also conducive to improving the coal powder density near the one-level breeze airflow (not having the coal dust of upper level to flow into) of spout housing, improves the effect of decoupling burning.
3, the size dimension of two collection powder flame holders of the present invention, shape with can not be identical apart from burner hearth distance, the collection powder concentrated effect of powder flame holder and the smoke backflow ability at rear portion can be collected by priority support one like this, and avoid another collection powder flame holder rear portion to produce coking at spout.
4, burner structure of the present invention is simple, safeguards easily.Owing to can dock with any one Pulverized Coal Concentration device, flexibility is higher, to the different type of furnace and the adaptability enhancing using Coal rank.
Accompanying drawing explanation
Fig. 1 is the existing decoupling burning device structure front view containing collection powder flame holder;
Fig. 2 is the structure front view of coal dust decoupling burning device of the present invention;
Fig. 3 is the structure vertical view cutaway drawing of coal dust decoupling burning device of the present invention;
Fig. 4 is that sectional view is looked on the structure right side of coal dust decoupling burning device of the present invention.
Accompanying drawing identifies
1, spout; 2, split-flow baffles; 3, powder flame holder is collected; 4, deversoir; 5, light side gas flow path; 6, dense side gas flow path.
Detailed description of the invention
Be further described below in conjunction with the coal dust decoupling burning device of accompanying drawing to dense side classification of the present invention, it is only used as explanation of the invention instead of restriction.
As shown in Figure 2, a kind of coal dust decoupling burning device shunting enrichment, this burner comprises spout 1 and two collection powder flame holders 3, along airflow direction, the cross section of collection powder flame holder 3 rear end be by spout 1 edge to center diminishing step structure.The middle part of described burner nozzle 1 is provided with thicker split-flow baffles 2, and the two ends up and down of split-flow baffles 2 are connected with spout shell body.As shown in Figure 3, spout 1 separates two gas channels for the through-flow light side gas flow path 5 of difference and dense side gas flow path 6 by split-flow baffles 2, and described a pair collection powder flame holder 3 is positioned at the passage side of logical dense sidewind 6; Described split-flow baffles 2 is for being in tilted layout, and the passage of the dense sidewind 6 that split-flow baffles 2 is surrounded with the housing of spout 1 increases gradually along the actual internal area of air flow direction; Split-flow baffles 2 can lead to light sidewind 5, makes light sidewind 5 depart from dense sidewind 6 and flows, the mixing of both postponements.
Split-flow baffles 2 leaves distance, to increase the distance of high temperature gases recirculating along the rear end of airflow direction apart from the rear end of spout shell body; Split-flow baffles 2 is greater than front end along the rear end area of section of airflow direction, and after end section be that waveform etc. is irregularly shaped, to increase the capacity of returns of burner hearth high-temperature flue gas, and increase the contact area of breeze airflow and burner hearth high-temperature flue gas, improve flue gas to the firing rate of air-flow.
As shown in Figure 4, the overall cross section of collection powder flame holder 3 is flat taper, and along airflow direction, front elevational sectional is little, and rear end section is large; The lateral surface of two collection powder flame holders 3 is connected with spout 1, and medial surface is near split-flow baffles 2; The prism of two collection powder flame holders 3 is relative, is provided with through-flow space between prism; Two collection powder flame holders 3 leave distance along the rear end of airflow direction apart from the rear end of spout shell body, to increase the distance of collection powder flame holder 3 rear portion high temperature gases recirculating.
Two collection powder flame holders 3 are not identical apart from the rear end distance of spout shell body along the rear end of airflow direction, like this can the smoke backflow ability at larger collection powder flame holder 3 rear portion of the rear end distance of priority support rear end apart from spout shell body, and avoid the coking that another collection powder flame holder 3 rear portion produces at spout.
The size dimension of two collection powder flame holders 3, shape and the rear end cross-sectional sizes along airflow direction also can be different, like this can the collection powder concentrated effect of priority support one larger-size collection powder flame holder 3 prism and the smoke backflow ability at its rear portion.
As the another improvement of such scheme, each cascaded surface of the prism of collection powder flame holder 3 is provided with deversoir 4 near split-flow baffles 2 side; Deversoir 4 is strip structure that is longer along airflow direction, that bend with the cascaded surface and corresponding inclined-plane that collect powder flame holder 3 at airflow direction; A sidewall of each deversoir 4 is close to the cascaded surface and corresponding inclined-plane that are connected to collection powder flame holder 3 along its length; Each deversoir 4 can stop that the coal dust of the cascaded surface and corresponding inclined-plane being close to collection powder flame holder 3 is with air flow direction split-flow baffles 2 side.
As the another improvement of such scheme, the sidewall increasing side, direction (away from split-flow baffles 2 side) near the cross section collecting powder flame holder 3 of deversoir 4 is increase direction lopsidedness along airflow direction to the cross section of collection powder flame holder 3.
As the another improvement of such scheme, on each cascaded surface of the prism of collection powder flame holder 3, compartment of terrain is furnished with multiple deversoir 4, each deversoir 4 can stop that the coal dust of the prism being close to collection powder flame holder 3 is with air flow direction split-flow baffles 2 side, make the CONCENTRATION DISTRIBUTION of dense powder air-flow between each cascaded surface present significantly steps, the CONCENTRATION DISTRIBUTION simultaneously in each cascaded surface is more even.
The coal dust decoupling burning method utilizing said apparatus to carry out comprises the following steps:
1) after coal dust enters spout 1, through a pair collection powder flame holder be oppositely arranged, due to the squeezing action on inclined-plane, middle part flowing in air deflection spout, coal dust is due to effect of inertia, and the concentration of the breeze airflow of craspedodrome improves, and forms thick coal culm air-flow;
2) the collection powder flame holder of coal dust through being oppositely arranged, due to the ladder-type structure of this pair collection powder flame holder rear end, the air-flow that ladder is high is squeezed greatly, in this passage, formation is higher near the outer sidewind coal powder density of spout shell body, flow velocity is faster, the coal powder density at center and flow velocity be that the staged of corresponding reduction distributes in the spout, the front end of this pair collection powder flame holder forms larger backflow space in outside, larger from the heat smoke amount of burner hearth backflow, the intensity that outside thick coal culm air-flow is heated is higher.
As preferably, device of the present invention can also dock with other Pulverized Coal Concentration devices, thus realize concentrating further coal dust, obtain the coal dust decoupling burning device of dense side enrichment again, dense sidewind 6 in described coal dust and light sidewind 5 through dense powder passage and the light powder passage of spout 1, enter hearth combustion respectively.
As further preferred, step 1) and 2) also comprise following sub-step:
11), after breeze airflow flows through outside Pulverized Coal Concentration device, dense sidewind and light sidewind is divided into; Dense sidewind enters the dense side gas flow path of described spout 1, due to the squeezing action on the inclined-plane of collection powder flame holder be oppositely arranged, middle part flowing in partial air deflection spout in this dense sidewind, coal dust is due to effect of inertia, the concentration of the thick coal culm air-flow of keeping straight on improves further, forms super thick coal culm air-flow; Be extruded the air-flow distributed to carry part coal dust and form time thick coal culm air-flow.
21) side, direction is increased in the cross section of the air-flow guiding collection powder flame holder pressing close to collect powder flame holder surface by the deversoir of sidewall slope, deversoir laterally summarizes collection powder flame holder 3 at the vertical coal dust collected, and fraction is vertically being pressed to middle part, the concentrated coal powder density that improve the breeze airflow of the sidewall side of the inclination of close collection powder flame holder 3 prism and deversoir further, this air-flow is concentrated becomes the more higher leveled super thick coal culm air-flow of coal powder density; To entrainment area large on the border of this super thick coal culm air-flow simultaneously, easily entrainments more high-temperature hot flue gas, becomes stabilizing the flame of catching fire; The sloped sidewall of deversoir makes the angle in more coal dust and light powder air current flow direction increase, and then the mixing both postponing.
22) super thick coal culm air-flow and super thick coal culm air-flow heat up rapidly, super thick coal culm generation fast pyrogenation, gasification, volatile matter nitrogen ratio significantly improves, the oxygen content of super thick coal culm air-flow is extremely low, in volatile matter after coal pyrolytic gasified, reducing substances is many, and thus volatile matter nitrogen generates stable N mostly in combustion
2; After the volatile combustion of ultra-concentrating powder air-flow, in succession with secondary dense powder air-flow and the progressively mixed combustion of light powder air-flow, because the coke in thick coal culm burns in succession, the consumption of oxygen is increased, under causing light powder air-flow to be still in Hypoxic habitats with dense powder air-flow mixing after-combustion, simultaneously by the catalytic reduction effect of coke, thus coke nitrogen is converted into NO
xratio very low.
When device comprises deversoir, super thick coal culm air-flow and super thick coal culm air-flow heat up rapidly, there is fast pyrogenation, gasification, burn under strong reducing property atmosphere, afterwards, in succession progressively mix with secondary dense powder air-flow and light powder air-flow and continue to burn under reducing atmosphere, combustion process makes most of volatile nitrogen and coke nitrogen generate stable N
2.
The method can further include following steps: through burner, and volatile matter nitrogen and the coal dust coke nitrogen burning conversion of dense powder, light powder are N
2after, supplement Secondary Air in time, allow coal dust that high-temperature oxygen-enriched reaction occurs, extend in the burner hearth clean-burning time, thus abundant after-flame, reduce the content of fly ash combustible material, CO in flue gas, achieve the decoupling burning of fine coal.
When breeze airflow flows through collection powder flame holder, owing to collecting the ladder-type structure of powder flame holder rear end, air-flow is squeezed deflection, the coal dust larger with inertia is shunted, formed in this passage higher near the outer sidewind coal powder density of spout shell body, flow velocity is faster, in spout, the coal powder density at center and flow velocity be that the staged of corresponding reduction distributes; Because the front end of collection powder flame holder forms larger backflow space in outside, larger from the heat smoke amount of burner hearth backflow, and outside surpass thick coal culm air-flow more easily and heat smoke contact, thus the intensity that heated of the super thick coal culm air-flow in outside is higher, pulverized coal pyrolysis gasify and burning velocity higher.
In addition, light powder side also can adopt the version identical with dense powder side, to improve the combustibility of light powder side.
Spout 1 of the present invention can be that rectangle also can for circular or oval, and its concrete shape does not affect the enforcement of the present invention program.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is modified or equivalent replacement, such as collection powder flame holder number is become 3 or more, these replace the spirit and scope not departing from technical solution of the present invention, and it all should be encompassed in the middle of right of the present invention.
Claims (12)
1. shunt a coal dust decoupling burning device for enrichment, it is characterized in that, described burner comprises spout, split-flow baffles and plural collection powder flame holder;
Described split-flow baffles is obliquely installed the middle part in described spout, and the two ends up and down of described split-flow baffles are connected with the shell body of described spout; Described spout is separated for light side gas flow path and dense side gas flow path by split-flow baffles, and described dense side gas flow path increases gradually along the actual internal area of air flow direction, and described collection powder flame holder is positioned at dense side gas flow path side;
Along airflow direction, the cross section of described collection powder flame holder rear end be by orifice rim to center diminishing step structure;
Each cascaded surface of the prism of described collection powder flame holder and corresponding inclined-plane are furnished with multiple deversoir to lateral separation.
2. burner according to claim 1, is characterized in that, described split-flow baffles leaves distance along the rear end of airflow direction and the rear end of spout shell body.
3. burner according to claim 1, is characterized in that, described split-flow baffles is greater than front elevational sectional area along the rear end area of section of airflow direction, and rear end section is irregularly shaped.
4. burner according to claim 1, is characterized in that, the number of described collection powder flame holder is two, and the cross section of described collection powder flame holder is flat taper, and along airflow direction, front elevational sectional is little, and rear end section is large; The lateral surface of described collection powder flame holder is connected with spout, and medial surface is near split-flow baffles; The prism of two collection powder flame holders is relative, is provided with through-flow space between prism; Two collection powder flame holders leave distance along the rear end of airflow direction and the rear end of spout shell body.
5. the burner according to claim 2 or 4, is characterized in that, described collection powder flame holder is not identical apart from the rear end distance of spout shell body along the rear end of airflow direction.
6. burner according to claim 4, is characterized in that, the size dimension of described collection powder flame holder, shape and the rear end cross-sectional sizes along airflow direction are incomplete same.
7. burner according to claim 4, is characterized in that, each cascaded surface and the corresponding inclined-plane of the prism of described collection powder flame holder are provided with deversoir near split-flow baffles side.
8. burner according to claim 7, is characterized in that, the sidewall increasing side, direction near the cross section collecting powder flame holder of described deversoir increases direction lopsidedness along airflow direction to the cross section of collection powder flame holder.
9. burner according to claim 1, is characterized in that, described burner is connected with outside Pulverized Coal Concentration device, and the dense sidewind in described outside Pulverized Coal Concentration device and light sidewind enter described dense side gas flow path and described light side gas flow path respectively.
10., based on a combustion method for the coal dust decoupling burning device of the arbitrary described shunting enrichment of claim 1 ~ 9, comprise the following steps:
1) after coal dust enters spout, through a pair collection powder flame holder be oppositely arranged, due to the squeezing action on inclined-plane, middle part flowing in partial air deflection spout, coal dust is due to effect of inertia, and the concentration of the breeze airflow of craspedodrome improves, and forms thick coal culm air-flow;
2) the collection powder flame holder of coal dust through being oppositely arranged, by the extruding of the forge piece of step type structure of a pair collection powder flame holder rear end, the air-flow that ladder is high is squeezed greatly, in this passage, formation is higher near the outer sidewind coal powder density of spout shell body, flow velocity is faster, the coal powder density at center and flow velocity be that the staged of corresponding reduction distributes in the spout, the front end of this pair collection powder flame holder forms larger backflow space in outside, larger from the heat smoke amount of burner hearth backflow, the intensity that outside thick coal culm air-flow is heated is higher;
Described method also comprises submethod:
Side, direction is increased in the cross section of the air-flow guiding collection powder flame holder pressing close to collect powder flame holder surface by the deversoir of sidewall slope, deversoir laterally summarizes collection powder flame holder at the vertical coal dust collected, and fraction is vertically being pressed to middle part, the concentrated coal powder density that improve the breeze airflow of the sidewall side of the inclination of close collection powder flame holder prism and deversoir further, this air-flow is concentrated becomes the more higher leveled super thick coal culm air-flow of coal powder density; To entrainment area large on the border of this super thick coal culm air-flow simultaneously, easily entrainments more high-temperature hot flue gas, becomes stabilizing the flame of catching fire; The sloped sidewall of deversoir makes the angle in more coal dust and light powder air current flow direction increase, and then the mixing both postponing;
Described step 1) also comprise submethod:
After breeze airflow flows through outside Pulverized Coal Concentration device, be divided into dense sidewind and light sidewind; Dense sidewind enters described dense side gas flow path, due to the squeezing action on the inclined-plane of collection powder flame holder be oppositely arranged, middle part flowing in the partial air deflection spout in this dense sidewind, coal dust is due to effect of inertia, the concentration of the thick coal culm air-flow of keeping straight on improves further, forms super thick coal culm air-flow; Be extruded the air-flow distributed to carry part coal dust and form time thick coal culm air-flow.
11. methods according to claim 10, is characterized in that, described method also comprises submethod:
Super thick coal culm air-flow and super thick coal culm air-flow heat up rapidly, there is fast pyrogenation, gasification, burn under strong reducing property atmosphere, afterwards, in succession progressively mix with secondary dense powder air-flow and light powder air-flow and continue to burn under reducing atmosphere, combustion process makes most of volatile nitrogen and coke nitrogen generate stable N
2.
12. methods according to claim 10, is characterized in that, described method also comprises step 3):
3) nitrogen in coal dust is converted into N in combustion process major part
2after, supplement Secondary Air in time, allow the semicoke that produces after coal dust primary combustion and coke that high-temperature oxygen-enriched reaction occurs, extend in the burner hearth clean-burning time, thus reduce the content of fly ash combustible material, CO in flue gas, realize the decoupling burning of fine coal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210587100.XA CN103062763B (en) | 2012-12-28 | 2012-12-28 | Distributary thickening coal decoupling burner and burning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210587100.XA CN103062763B (en) | 2012-12-28 | 2012-12-28 | Distributary thickening coal decoupling burner and burning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103062763A CN103062763A (en) | 2013-04-24 |
| CN103062763B true CN103062763B (en) | 2015-06-03 |
Family
ID=48105518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210587100.XA Expired - Fee Related CN103062763B (en) | 2012-12-28 | 2012-12-28 | Distributary thickening coal decoupling burner and burning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103062763B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203099813U (en) * | 2012-12-28 | 2013-07-31 | 中国科学院过程工程研究所 | Distributary thickening braize decoupling burner |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2151308C (en) * | 1994-06-17 | 1999-06-08 | Hideaki Ohta | Pulverized fuel combustion burner |
| CN201615479U (en) * | 2009-12-15 | 2010-10-27 | 李朝阳 | Combined vertical rich-lean pulverized coal concentration device |
| CN102620291B (en) * | 2011-01-31 | 2014-09-24 | 中国科学院过程工程研究所 | Pulverized coal decoupling combustor with low nitrogen oxide discharge and pulverized coal decoupling combustion method with low nitrogen oxide discharge |
| CN202338901U (en) * | 2011-11-18 | 2012-07-18 | 山西三合盛工业技术有限公司 | Power collecting and concentrating pulverized coal burner |
| CN202452487U (en) * | 2011-12-30 | 2012-09-26 | 中国科学院过程工程研究所 | Concentrated side classification pulverized coal decoupling combustor |
-
2012
- 2012-12-28 CN CN201210587100.XA patent/CN103062763B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203099813U (en) * | 2012-12-28 | 2013-07-31 | 中国科学院过程工程研究所 | Distributary thickening braize decoupling burner |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103062763A (en) | 2013-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102297421B (en) | W-type flame decoupling combustion furnace and decoupling combustion method | |
| CN101368725B (en) | Stable combustion anti-slag gap type W-shaped flame boiler apparatus | |
| CN102620291B (en) | Pulverized coal decoupling combustor with low nitrogen oxide discharge and pulverized coal decoupling combustion method with low nitrogen oxide discharge | |
| CN102297425B (en) | Pulverized coal decoupling combustor and decoupling combustion method thereof | |
| CN103104910B (en) | A kind of micro-oxygen-enriched combusting W flame boiler and CO 2emission-reducing system | |
| CN202546811U (en) | Compound furnace arch and compound secondary air structure | |
| CN101986028A (en) | Low-NOx W-type flame boiler with dry bottom hopper and furnace bottom air supplies distributed in bielliptical shape | |
| CN101358730B (en) | W type flame boiler with over-fired air device arranged at junction of upper and lower of hearth | |
| CN203099813U (en) | Distributary thickening braize decoupling burner | |
| CN201137933Y (en) | Low NOx coal fines thick and thin oil-saving burner | |
| RU2348861C1 (en) | Swirling-type furnace for solid fuel ignition | |
| CN103062763B (en) | Distributary thickening coal decoupling burner and burning method | |
| CN205227306U (en) | Deep or light hierarchical buggy low NOx burner | |
| CN202452487U (en) | Concentrated side classification pulverized coal decoupling combustor | |
| CN103123110B (en) | Pulverized coal burner for pulverized coal collection and concentration, and burning method | |
| CN202338901U (en) | Power collecting and concentrating pulverized coal burner | |
| CN205504972U (en) | Buggy decoupling zero combustor of reinforcing reposition of redundant personnel densification | |
| CN107152678B (en) | A kind of enhancing shunts the pulverized coal decoupling combustor and combustion method of enrichment | |
| CN103185338B (en) | A kind of coal dust decoupling burning device of dense side classification and combustion method | |
| CN201875703U (en) | Pulverized coal burner and pulverized coal boiler | |
| CN101852427B (en) | Petroleum coke direct burner | |
| CN203628634U (en) | Upper and lower rich-lean pulverized coal combustion device | |
| CN101725968A (en) | Coal dust combustion method using oxygen-enriched local combustion supporting | |
| CN2929483Y (en) | Pre-heating type concentration and thin direct flow coal powder burner | |
| CN1202372C (en) | Enriched multiple straight-through coal burners |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20171228 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |