CN103062763A - Distributary thickening braize decoupling burner and burning method - Google Patents
Distributary thickening braize decoupling burner and burning method Download PDFInfo
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- CN103062763A CN103062763A CN201210587100XA CN201210587100A CN103062763A CN 103062763 A CN103062763 A CN 103062763A CN 201210587100X A CN201210587100X A CN 201210587100XA CN 201210587100 A CN201210587100 A CN 201210587100A CN 103062763 A CN103062763 A CN 103062763A
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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 the coal-dust combustion device field, be specifically related to a kind of coal dust decoupling burning device and combustion method of shunting enrichment.
Background technology
In the practical application of coal dust firing, along with coal air mixture in the ignition temperature of combustion phases and the raising of oxygen concentration, easier fast, the abundant after-flame of coal dust, the content of fly ash combustible material in the flue gas (uncompleted burned carbon and CO), but simultaneously high-temperature oxygen-enrichedly can make the NO that generates in the combustion process again
xSignificantly improve; On the other hand, coal air mixture more is conducive to suppress nitrogen oxide NO in that the ignition temperature of combustion phases and oxygen concentration are more low
xGenerate, but coal dust more is difficult for after-flame.Thereby, fly ash combustible material and the NO of releasing coal dust firing
xThe coupling emission problem be long-standing technological difficulties on the combustion technology.
Burning Technique by Dispelling Coupling can realize removing fly ash combustible material and the NO of coal burning
xCoupling discharging relation, be to reduce simultaneously fly ash combustible material and NO
xThe effective ways of discharging.Its mechanism is: the coal burning process is divided into two stages, and the phase I, pyrolysis, gasification and burning occur in coal under very high reducing atmosphere, take full advantage of the pyrolysis of coal self and gasification product with fuel type NO
xBe converted into more stable N
2Second stage is created high-temperature oxygen-enriched but is not produced thermal NO
xEnvironment, guarantee again the abundant after-flame of coal.
Decoupling burning suppresses NO
xThe critical process of discharging, the conversion process of the fugitive constituent nitrogen that produces at burning initial stage pyrolytic gasification, this process mainly less spatial dimension before wind inside, a Secondary Air mix is carried out, wind with namely begin the after-flame stage after Secondary Air mixes.This process is the fractional combustion that belongs on the microcosmic, and mechanism is different from the Researched of Air Staging Combustion Burning Pulverized Coal on the macroscopic view, and the reducing agent of decoupling burning takes full advantage of the pyrolytic gasification product, and reactivity is higher.
At present, developed multiple decoupling burning device according to the decoupling burning principle, patent " a kind of coal dust decoupling burning device and combustion method of dense side classification " (Chinese patent application number: 201120569682.X) disclose a kind of coal dust decoupling burning device, this burner structure schematic diagram as shown in Figure 1, it comprises spout 1, split-flow baffles 2 and collection powder flame holder 3; It is integrated in one Pulverized Coal Concentration and steady combustion function, not only can improve the effect of decoupling burning, and structure is also comparatively simple, can dock with any one Pulverized Coal Concentration device, and flexibility is higher, and the adaptability that uses Coal rank is strengthened.But this burner is some deficiency still, such as, dense side breeze airflow is flowed through behind the collection powder flame holder, although so that the wind powder is further separated, 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 the part, both sides, isolated wind is all also concentrated in the inferior thick coal culm air-flow that imports the middle part, so that the coal powder density of inferior thick coal culm air-flow separates front reduction, obviously be unfavorable for suppressing NO
xGenerate; Secondly, super thick coal culm air-flow and time thick coal culm air-flow two parts are not separated mobile, but closely link to each other, and mix faster in flowing must reduce again deep or light separation and suppress NO
xThe effect that generates.In addition, dense powder side and the light powder lateral extent of this burner are also nearer, 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 slowlyer, and the reducing atmosphere time shorten is extremely to be unfavorable for suppressing NO
xGenerate.Also have, when breeze airflow is flowed through collection powder flame holder, mostly concentrated at the surface of powder flame holder by the coal dust of collection powder flame holder collection, along with being squeezed, opens when flowing to side direction and dense powder flow separation in air-flow, can take the coal dust that part is compiled to low concentration region, thereby reduce the effect that collection powder flame holder separates the wind powder.
Summary of the invention
The object of the present invention is to provide a kind of coal dust decoupling burning device of shunting enrichment, this burner is by separating part air-flow in the breeze airflow and the coal dust that compiles mobile, increase the coal powder density of breeze airflow, not only effective, the dense powder air-flow of Pulverized Coal Concentration firing rate is fast, and postponed the mixing of dense powder air-flow and light powder air-flow, structure is also further simplified, and performance is further promoted.
A kind of coal dust decoupling burning device of shunting enrichment provided by the invention to achieve these goals, described burner comprises spout 1, split-flow baffles 2 and is no less than two collection powder flame holder 3.Wherein, split-flow baffles 2 is obliquely installed in the middle part of spout 1, and the shell body that the up and down two ends of split-flow baffles 2 installation end of airflow direction (namely perpendicular to) is connected with spout connects; Spout 1 is separated for distinguishing two gas channels of through-flow light sidewind 5 and dense sidewind 6 by split-flow baffles 2.Along airflow direction, the cross section of collection powder flame holder 3 rear ends be by spout 1 edge to the center diminishing step structure.
Described collection powder flame holder 3 is positioned at passage one side of logical dense sidewind 6; Described split-flow baffles 2 is for being in tilted layout, so that the passage of the dense sidewind 6 that the housing of split-flow baffles 2 and spout 1 surrounds 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, and postpones the mixing of the two.
Preferably, described split-flow baffles 2 leaves distance along the rear end of airflow direction apart from the rear end of spout shell body, to increase the distance of high temperature gases recirculating; Split-flow baffles 2 along the rear end area of section of airflow direction greater than front end, and rear end section is that waveform etc. is irregularly shaped, with the capacity of returns of increase burner hearth high-temperature flue gas, and the contact area that increases breeze airflow and burner hearth high-temperature flue gas, flue gas improved to the firing rate of air-flow.
When breeze airflow is flowed through collection powder flame holder, because the ladder-type structure of collection powder flame holder rear end, the deflection so that air-flow is squeezed, the coal dust shunting larger with inertia, the outer sidewind coal powder density that forms close spout shell body in this passage is higher, flow velocity is faster, distributes near the coal powder density at center in the spout and the staged that flow velocity is corresponding reduction; Because the front end of collection powder flame holder forms larger backflow space in the outside, the hot exhaust gas volumn that refluxes from burner hearth is larger, and the outside easier and hot Gas phase Smoke of super thick coal culm air-flow contacts, thereby the intensity that the super thick coal culm air-flow in the outside is heated is higher, and pulverized coal pyrolysis gasification and burning velocity are higher.
Preferably, the number of described collection powder flame holder 3 is two, and the whole cross section of this collection powder flame holder 3 is flat taper, and along airflow direction, front end section 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 the 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 recirculatings.
Another improvement as such scheme, the rear end distance apart from the spout shell body can be not identical along the rear end of airflow direction for two collection powder flame holders 3, like this can the priority support rear end apart from the smoke backflow ability at larger collection powder flame holder 3 rear portions of the rear end distance of spout shell body, and avoid another collection powder flame holder 3 rear portions to produce coking at spout.
Another improvement as such scheme, the size dimension of two collection powder flame holders 3, shape can be different with rear end cross-sectional sizes along airflow direction, collection powder concentrated effect that like this can larger-size collection powder flame holder 3 prisms of priority support 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 one sides; Described deversoir 4 be long along airflow direction, at airflow direction with the cascaded surface of collection powder flame holder 3 and the strip structure of corresponding inclined-plane bending; A sidewall of described each deversoir 4 is close to cascaded surface and the corresponding inclined-plane that is connected to collection powder flame holder 3 along its length; Described each deversoir 4 can stop that the coal dust on the cascaded surface of being close to collection powder flame holder 3 and corresponding inclined-plane is with air flow direction split-flow baffles 2 one sides.
Another improvement as such scheme, the sidewall of direction one side (away from split-flow baffles 2 one sides) is increased for increasing the direction lopsidedness along airflow direction to the cross section of collection powder flame holder 3 in the cross section near collection powder flame holder 3 of described deversoir 4, to press close to collect the cross section of the air-flow guiding collection powder flame holder 3 on powder flame holder 3 surfaces and increase direction one side (away from split-flow baffles 2 one sides), because deversoir 4 has laterally compiled collection powder flame holder 3 at the vertical coal dust of collecting, and with the part air-flow vertically pressing to the middle part, further the coal powder density of the breeze airflow of sidewall one side of the concentrated inclination that has improved close collection powder flame holder 3 prisms and deversoir 4 makes the concentrated more higher leveled super thick coal culm air-flow of coal powder density that becomes of this air-flow; Be somebody's turn to do simultaneously the external angle that super ultra-concentrating powder air-flow is positioned at the air-flow cross section, in addition deversoir 4 rear formation smoke backflows and increased the air-flow border and entrainment area, so that the easier warm flue gas of more height that entrainments of this air-flow, thereby for the unburnable coal of low-volatile, this air-flow can become the retention flame that catches fire, and greatly improves the steady combustion ability of burner; The guide effect of deversoir 4 also can make the angle of more coal dust and light powder air current flow direction increase, and has postponed the mixing of the two, is conducive to suppress the generation of NOx.Another improvement as such scheme, horizontal compartment of terrain is furnished with a plurality of deversoirs 4 on each cascaded surface of the prism of collection powder flame holder 3 and the corresponding inclined-plane, each deversoir 4 can stop that the coal dust of the prism of being close to collection powder flame holder 3 is with air flow direction split-flow baffles 2 one sides, so that the CONCENTRATION DISTRIBUTION of dense powder air-flow between each cascaded surface presents obvious ladder, the CONCENTRATION DISTRIBUTION in each cascaded surface is more even simultaneously; Because the volatile content of the coal of high-volatile is high, pyrolysis is separated out soon, do not need the breeze airflow of super concentration just can form the strong reducing property combustion atmosphere at the burning initial stage, the simultaneously burning initial stage has an amount of oxidation reaction could realize the effect of the decoupling burning that reduces behind the initial oxidation, thereby this scheme is more suitable for the coal of high-volatile.
It is a kind of based on a kind of combustion method of shunting the coal dust decoupling burning device of enrichment that the present invention also provides, and said method comprising the steps of:
1) after coal dust entered spout 1, during through a pair of collection powder flame holder that is oppositely arranged, because the squeezing action on inclined-plane, in the air deflection spout flowed in the middle part, and coal dust is because effect of inertia, and the concentration of the breeze airflow of craspedodrome improves, and forms the thick coal culm air-flow.
When 2) coal dust through the collection powder flame holder that being oppositely arranged, because the ladder-type structure of this a pair of collection powder flame holder rear end, the air-flow that ladder is high is squeezed greatly, the outer sidewind coal powder density that forms close spout shell body in this passage is higher, flow velocity is faster, distribute near the coal powder density at center in the spout and the staged that flow velocity is corresponding reduction, the front end of this a pair of collection powder flame holder forms larger backflow space in the outside, the hot exhaust gas volumn that refluxes from burner hearth is larger, and 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, thereby realize further concentrating coal dust, obtain the again coal dust decoupling burning device of enrichment of dense side, dense sidewind 6 in the 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 substep:
11) after breeze airflow is flowed through outside Pulverized Coal Concentration device, be divided into dense sidewind and light sidewind; Dense sidewind enters the dense sidewind passage of described spout 1, because the squeezing action on the inclined-plane of the collection powder flame holder that is oppositely arranged, in the part air deflection spout in this dense sidewind flow in the middle part, coal dust is because effect of inertia, the concentration of the thick coal culm air-flow of keeping straight on further improves, and forms super thick coal culm air-flow; Being extruded the air-flow that distributes carries the part coal dust and forms time thick coal culm air-flow.
21) direction one side is increased in the deversoir of the sidewall slope cross section that will press close to collect the air-flow guiding collection powder flame holder on powder flame holder surface, deversoir has laterally compiled collection powder flame holder 3 at the vertical coal dust of collecting, and with the part air-flow vertically pressing to the middle part, further the coal powder density of the breeze airflow of sidewall one side of the concentrated inclination that has improved close collection powder flame holder 3 prisms and deversoir makes the concentrated more higher leveled super thick coal culm air-flow of coal powder density that becomes of this air-flow; It is large that area is entrainmented on border that simultaneously should super thick coal culm air-flow, easily entrainments the warm flue gas of more height, becomes the retention flame that catches fire; The sloped sidewall of deversoir increases the angle of more coal dust and light powder air current flow direction, and then postpones the mixing of the two.
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, reducing substances is many in the volatile matter after coal pyrolytic gasified, thereby volatile matter nitrogen generates stable N mostly in combustion process
2Behind the volatile combustion of ultra-concentrating powder air-flow, in succession with inferior dense powder air-flow and the progressively mixed combustion of light powder air-flow, because the coke in the thick coal culm burns in succession, consumption to oxygen increases, cause light powder air-flow still to be under the Hypoxic habitats with dense powder air-flow mixing after-combustion, be subjected to simultaneously the catalytic reduction effect of coke, thereby coke nitrogen is converted into NO
xRatio very low.
Described method further may further comprise the steps: through burner, the volatile matter nitrogen of dense powder, light powder and coal dust coke nitrogen burning conversion are N
2After, in time replenish Secondary Air, allow coal dust that high-temperature oxygen-enriched reaction occurs, prolong in the clean-burning time of burner hearth, thereby abundant after-flame reduces the content of fly ash combustible material, CO in the flue gas, has realized the decoupling burning of fine coal.
The outstanding feature of coal dust decoupling burning device provided by the invention and combustion method:
1, dense powder air-flow all shunt again concentratedly by collection powder flame holder, can make the more breeze airflow near burner hearth one side reach super dense state.Because being in tilted layout of split-flow baffles so that the air-flow that dense sidewind distributes can be partial to the spatial flow of light powder side, namely increased the effect that dense crosswind powder separates, and also reduced the pressure drop of spout; Simultaneously, because split-flow baffles is extruded air-flow to the yaw motion of light powder side to water conservancy diversion and the dense side of light powder air-flow, can postpones the mixing of light powder air-flow and dense powder air-flow, thereby 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 through inertial separation and go out, be close to the coal dust of collection powder flame holder prism with the light powder side of air flow direction, thereby realize the shunting of wind powder, improved the concentration of the coal dust of the super thick coal culm air-flow of dense side.
Deversoir 4 away from the sidewall of split-flow baffles 2 one sides along airflow direction to the lopsidedness away from split-flow baffles 2, laterally compiled collection powder flame holder 3 at the vertical coal dust of collecting, further improved the coal powder density of the close deversoir 4 that is laterally pushed and the breeze airflow that collects powder flame holder 3 inclined-planes one side, made the concentrated super thick coal culm air-flow of the higher one-level of coal powder density that becomes of this super dense air-flow; This dense powder air-flow is positioned at the external angle of air-flow cross section simultaneously, in addition deversoir 4 rear formation smoke backflows and increased the air-flow border and entrainment area, so that the easier warm flue gas of more height that entrainments of this air-flow, thereby for the unburnable coal of low-volatile, this air-flow can become the retention flame that catches 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 air-flow reverse flow, has postponed the mixing of the two, is conducive to suppress NO
xGeneration.
But on each cascaded surface of collection powder flame holder also the compartment of terrain be furnished with a plurality of deversoirs 4, can be so that the CONCENTRATION DISTRIBUTION of dense powder air-flow between each cascaded surface presents obvious ladder, CONCENTRATION DISTRIBUTION in each cascaded surface is more even simultaneously, coal for high-volatile is more suitable, this also is conducive to improve the coal powder density of the one-level breeze airflow (not having the coal dust of upper level to flow into) of the most close spout housing, the effect of raising decoupling burning.
3, the size dimension of two collection powder flame holders of the present invention, shape with can be not identical apart from the burner hearth distance, can collect the collection powder concentrated effect of powder flame holder and the smoke backflow ability at rear portion by one of priority support 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.Because can dock with any one Pulverized Coal Concentration device, flexibility is higher, the different type of furnaces and the adaptability that uses Coal rank are strengthened.
Description of drawings
Fig. 1 is the existing decoupling burning device structure front view that contains 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 cutaway view is looked on the structure right side of coal dust decoupling burning device of the present invention.
The accompanying drawing sign
1, spout; 2, split-flow baffles; 3, collection powder flame holder; 4, deversoir; 5, light sidewind passage; 6, dense sidewind passage.
The specific embodiment
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 as explanation of the invention rather than restriction.
As shown in Figure 2, a kind of coal dust decoupling burning device of shunting enrichment, this burner comprise spout 1 and two collection powder flame holders 3, along airflow direction, the cross section of collection powder flame holder 3 rear ends be by spout 1 edge to the center diminishing step structure.The middle part of described burner nozzle 1 is provided with thicker split-flow baffles 2, and the up and down two ends of split-flow baffles 2 are connected with the spout shell body.As shown in Figure 3, spout 1 is separated for distinguishing two gas channels of through-flow light sidewind passage 5 and dense sidewind passage 6 by split-flow baffles 2, and described a pair of collection powder flame holder 3 is positioned at passage one side of logical dense sidewind 6; Described split-flow baffles 2 is for being in tilted layout, so that the passage of the dense sidewind 6 that the housing of split-flow baffles 2 and spout 1 surrounds 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, and postpones the mixing of the two.
Split-flow baffles 2 leaves distance along the rear end of airflow direction apart from the rear end of spout shell body, to increase the distance of high temperature gases recirculating; Split-flow baffles 2 along the rear end area of section of airflow direction greater than front end, and rear end section is that waveform etc. is irregularly shaped, with the capacity of returns of increase burner hearth high-temperature flue gas, and the contact area that increases breeze airflow and burner hearth high-temperature flue gas, flue gas improved to the firing rate of air-flow.
As shown in Figure 4, the whole cross section of collection powder flame holder 3 is flat taper, and along airflow direction, front end section 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 the 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 recirculatings.
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 priority support rear end apart from the smoke backflow ability at larger collection powder flame holder 3 rear portions of the rear end distance of spout shell body, and the coking of avoiding another collection powder flame holder 3 rear portions to produce at spout.
The size dimension of two collection powder flame holders 3, shape also can be different with rear end cross-sectional sizes along airflow direction, collection powder concentrated effect that like this can larger-size collection powder flame holder 3 prisms of priority support 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 one sides; Deversoir 4 be long along airflow direction, at airflow direction with the cascaded surface of collection powder flame holder 3 and the strip structure of corresponding inclined-plane bending; A sidewall of each deversoir 4 is close to cascaded surface and the corresponding inclined-plane that is connected to collection powder flame holder 3 along its length; Each deversoir 4 can stop that the coal dust on the cascaded surface of being close to collection powder flame holder 3 and corresponding inclined-plane is with air flow direction split-flow baffles 2 one sides.
As the another improvement of such scheme, the sidewall of direction one side (away from split-flow baffles 2 one sides) is increased for increasing the direction lopsidedness along airflow direction to the cross section of collection powder flame holder 3 in the cross section near collection powder flame holder 3 of deversoir 4.
Another improvement as such scheme, the compartment of terrain is furnished with a plurality of deversoirs 4 on each cascaded surface of the prism of collection powder flame holder 3, each deversoir 4 can stop that the coal dust of the prism of being close to collection powder flame holder 3 is with air flow direction split-flow baffles 2 one sides, so that the CONCENTRATION DISTRIBUTION of dense powder air-flow between each cascaded surface presents obvious ladder, the CONCENTRATION DISTRIBUTION in each cascaded surface is more even simultaneously.
The coal dust decoupling burning method of utilizing said apparatus to carry out may further comprise the steps:
1) after coal dust entered spout 1, during through a pair of collection powder flame holder that is oppositely arranged, because the squeezing action on inclined-plane, in the air deflection spout flowed in the middle part, and coal dust is because effect of inertia, and the concentration of the breeze airflow of craspedodrome improves, and forms the thick coal culm air-flow;
When 2) coal dust through the collection powder flame holder that being oppositely arranged, because the ladder-type structure of this a pair of collection powder flame holder rear end, the air-flow that ladder is high is squeezed greatly, the outer sidewind coal powder density that forms close spout shell body in this passage is higher, flow velocity is faster, distribute near the coal powder density at center in the spout and the staged that flow velocity is corresponding reduction, the front end of this a pair of collection powder flame holder forms larger backflow space in the outside, the hot exhaust gas volumn that refluxes from burner hearth is larger, and 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, thereby realize further concentrating coal dust, obtain the again coal dust decoupling burning device of enrichment of dense side, dense sidewind 6 in the 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 substep:
11) after breeze airflow is flowed through outside Pulverized Coal Concentration device, be divided into dense sidewind and light sidewind; Dense sidewind enters the dense sidewind passage of described spout 1, because the squeezing action on the inclined-plane of the collection powder flame holder that is oppositely arranged, in the part air deflection spout in this dense sidewind flow in the middle part, coal dust is because effect of inertia, the concentration of the thick coal culm air-flow of keeping straight on further improves, and forms super thick coal culm air-flow; Being extruded the air-flow that distributes carries the part coal dust and forms time thick coal culm air-flow.
21) direction one side is increased in the deversoir of the sidewall slope cross section that will press close to collect the air-flow guiding collection powder flame holder on powder flame holder surface, deversoir has laterally compiled collection powder flame holder 3 at the vertical coal dust of collecting, and with the part air-flow vertically pressing to the middle part, further the coal powder density of the breeze airflow of sidewall one side of the concentrated inclination that has improved close collection powder flame holder 3 prisms and deversoir makes the concentrated more higher leveled super thick coal culm air-flow of coal powder density that becomes of this air-flow; It is large that area is entrainmented on border that simultaneously should super thick coal culm air-flow, easily entrainments the warm flue gas of more height, becomes the retention flame that catches fire; The sloped sidewall of deversoir increases the angle of more coal dust and light powder air current flow direction, and then postpones the mixing of the two.
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, reducing substances is many in the volatile matter after coal pyrolytic gasified, thereby volatile matter nitrogen generates stable N mostly in combustion process
2Behind the volatile combustion of ultra-concentrating powder air-flow, in succession with inferior dense powder air-flow and the progressively mixed combustion of light powder air-flow, because the coke in the thick coal culm burns in succession, consumption to oxygen increases, cause light powder air-flow still to be under the Hypoxic habitats with dense powder air-flow mixing after-combustion, be subjected to simultaneously the catalytic reduction effect of coke, thereby 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, fast pyrogenation, gasification occur, under strong reducing property atmosphere, burn, afterwards, in succession progressively mix with inferior dense powder air-flow and light powder air-flow and continue to burn under reducing atmosphere, combustion process is so that most of volatile nitrogen and coke nitrogen generate stable N
2
The method can further include following steps: through burner, the volatile matter nitrogen of dense powder, light powder and coal dust coke nitrogen burning conversion are N
2After, in time replenish Secondary Air, allow coal dust that high-temperature oxygen-enriched reaction occurs, prolong in the clean-burning time of burner hearth, thereby abundant after-flame reduces the content of fly ash combustible material, CO in the flue gas, has realized the decoupling burning of fine coal.
When breeze airflow is flowed through collection powder flame holder, because the ladder-type structure of collection powder flame holder rear end, the deflection so that air-flow is squeezed, the coal dust shunting larger with inertia, the outer sidewind coal powder density that forms close spout shell body in this passage is higher, flow velocity is faster, distributes near the coal powder density at center in the spout and the staged that flow velocity is corresponding reduction; Because the front end of collection powder flame holder forms larger backflow space in the outside, the hot exhaust gas volumn that refluxes from burner hearth is larger, and the outside easier and hot Gas phase Smoke of super thick coal culm air-flow contacts, thereby the intensity that the super thick coal culm air-flow in the outside is heated is higher, and pulverized coal pyrolysis gasification and burning velocity are higher.
In addition, light powder side also can adopt the version identical with dense powder side, to improve the combustibility of light powder side.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although with reference to embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, become 3 or more such as collecting powder flame holder number, these replace the spirit and scope that do not break away from technical solution of the present invention, and it all should be encompassed in the middle of the claim scope of the present invention.
Claims (15)
1. a coal dust decoupling burning device of shunting enrichment 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 up and down two ends of described split-flow baffles be connected the shell body of spout and connect; Described spout is separated by split-flow baffles and is light sidewind passage and dense sidewind passage, and described dense sidewind passage increases gradually along the actual internal area of air flow direction, and described collection powder flame holder is positioned at dense sidewind channel side;
Along airflow direction, the cross section of described collection powder flame holder rear end be by orifice rim to the center diminishing step structure.
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, greater than the front end area of section, and rear end section is irregularly shaped to described split-flow baffles along the rear end area of section of airflow direction.
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 end section 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 the prism; Two collection powder flame holders leave distance along the rear end of airflow direction and the rear end of spout shell body.
5. according to claim 2 or 4 described burners, it 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 incomplete same along the rear end cross-sectional sizes of airflow direction.
7. burner according to claim 4 is characterized in that, each cascaded surface of the prism of described collection powder flame holder and corresponding inclined-plane are provided with deversoir near split-flow baffles one side.
8. burner according to claim 7 is characterized in that, the sidewall that direction one side is increased in the cross section near collection powder flame holder of described deversoir increases the direction lopsidedness along airflow direction to the cross section of collection powder flame holder.
9. burner according to claim 1 is characterized in that, horizontal compartment of terrain is furnished with a plurality of deversoirs on each cascaded surface of the prism of described collection powder flame holder and the corresponding inclined-plane.
10. burner according to claim 1 is characterized in that, described burner be connected the Pulverized Coal Concentration device and connect, the dense sidewind in the described outside Pulverized Coal Concentration device and light sidewind enter respectively described dense sidewind passage and described light sidewind passage.
11. the combustion method based on the coal dust decoupling burning device of the arbitrary described shunting enrichment of claim 1～10 may further comprise the steps:
1) after coal dust entered spout, during through a pair of collection powder flame holder that is oppositely arranged, because the squeezing action on inclined-plane, in the part air deflection spout flowed in the middle part, and coal dust is because effect of inertia, and the concentration of the breeze airflow of craspedodrome improves, and forms the thick coal culm air-flow;
When 2) coal dust through the collection powder flame holder that being oppositely arranged, be subjected to the extruding of the notch cuttype structure of a pair of collection powder flame holder rear end, the air-flow that ladder is high is squeezed greatly, the outer sidewind coal powder density that forms close spout shell body in this passage is higher, flow velocity is faster, distribute near the coal powder density at center in the spout and the staged that flow velocity is corresponding reduction, the front end of this a pair of collection powder flame holder forms larger backflow space in the outside, the hot exhaust gas volumn that refluxes from burner hearth is larger, and the intensity that outside thick coal culm air-flow is heated is higher.
12. method according to claim 11 is characterized in that, described step 1) also comprises submethod:
Breeze airflow is flowed through behind the outside Pulverized Coal Concentration device, is divided into dense sidewind and light sidewind; Dense sidewind enters described dense sidewind passage, because the squeezing action on the inclined-plane of the collection powder flame holder that is oppositely arranged, in the part air deflection spout in this dense sidewind flow in the middle part, and coal dust is because effect of inertia, the concentration of the thick coal culm air-flow of keeping straight on further improves, and forms super thick coal culm air-flow; Being extruded the air-flow that distributes carries the part coal dust and forms time thick coal culm air-flow.
13. method according to claim 12 is characterized in that, described method also comprises submethod:
The deversoir of sidewall slope will be pressed close to collect the cross section of the air-flow guiding collection powder flame holder on powder flame holder surface and increase direction one side, deversoir has laterally compiled collection powder flame holder at the vertical coal dust of collecting, and with the part air-flow vertically pressing to the middle part, further the coal powder density of the breeze airflow of sidewall one side of the concentrated inclination that has improved close collection powder flame holder prism and deversoir makes the concentrated more higher leveled super thick coal culm air-flow of coal powder density that becomes of this air-flow; It is large that area is entrainmented on border that simultaneously should super thick coal culm air-flow, easily entrainments the warm flue gas of more height, becomes the retention flame that catches fire; The sloped sidewall of deversoir increases the angle of more coal dust and light powder air current flow direction, and then postpones the mixing of the two.
14. method according to claim 13 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, fast pyrogenation, gasification occur, under strong reducing property atmosphere, burn, afterwards, in succession progressively mix with inferior dense powder air-flow and light powder air-flow and continue to burn under reducing atmosphere, combustion process is so that most of volatile nitrogen and coke nitrogen generate stable N
2
15. method according to claim 11 is characterized in that, described method also comprises step 3):
3) nitrogen in the coal dust is converted into N in the combustion process major part
2After, in time replenish Secondary Air, allow the semicoke and the coke that produce after the coal dust primary combustion that high-temperature oxygen-enriched reaction occurs, prolong in the clean-burning time of burner hearth, thereby reduce the content of fly ash combustible material, CO in the flue gas, realize the decoupling burning of fine coal.
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| CN201210587100.XA CN103062763B (en) | 2012-12-28 | 2012-12-28 | Distributary thickening coal decoupling burner and burning method |
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| CN201210587100.XA CN103062763B (en) | 2012-12-28 | 2012-12-28 | Distributary thickening coal decoupling burner and burning method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FI953004A (en) * | 1994-06-17 | 1995-12-18 | Mitsubishi Heavy Ind Ltd | Burner for powdered fuel |
| CN201615479U (en) * | 2009-12-15 | 2010-10-27 | 李朝阳 | Combined vertical rich-lean pulverized coal concentration device |
| 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 |
| CN102620291A (en) * | 2011-01-31 | 2012-08-01 | 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 |
| 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 |
| 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 |
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2012
- 2012-12-28 CN CN201210587100.XA patent/CN103062763B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI953004A (en) * | 1994-06-17 | 1995-12-18 | Mitsubishi Heavy Ind Ltd | Burner for powdered fuel |
| CN201615479U (en) * | 2009-12-15 | 2010-10-27 | 李朝阳 | Combined vertical rich-lean pulverized coal concentration device |
| CN102620291A (en) * | 2011-01-31 | 2012-08-01 | 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 |
| 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 |
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