CN102454985A - Pulverized coal burner and pulverized coal boiler - Google Patents
Pulverized coal burner and pulverized coal boiler Download PDFInfo
- Publication number
- CN102454985A CN102454985A CN2010105293782A CN201010529378A CN102454985A CN 102454985 A CN102454985 A CN 102454985A CN 2010105293782 A CN2010105293782 A CN 2010105293782A CN 201010529378 A CN201010529378 A CN 201010529378A CN 102454985 A CN102454985 A CN 102454985A
- Authority
- CN
- China
- Prior art keywords
- pulverized coal
- passage
- coal
- section
- dense phase
- 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.)
- Granted
Links
Images
Abstract
The invention discloses a pulverized coal burner and a pulverized coal boiler, the disclosed pulverized coal burner comprises a pulverized coal concentration segment and a main body segment, which are connected sequentially, the pulverized coal concentration segment is provided with a pulverized coal concentration device, a concentrated phase pulverized coal through-flow part and a light phase pulverized coal through-flow part are formed in the pulverized coal concentration segment, the pulverized coal burner also comprises an ignition heat source; the main segment is internally provided with a baffle plate which extends along the flowing direction of the pulverized coal, the baffle plate at least divides the main segment into a concentrated phase pulverized coal channel and a light phase pulverized coal channel; the back ends of the concentrated phase pulverized coal through-flow part and the light phase pulverized coal through-flow part respectively correspond to the front ends of the concentrated phase pulverized coal channel and the light phase pulverized coal channel; the ignition heat source is located in the concentrated phase pulverized coal through-flow part or the concentrated phase pulverized coal channel. In the invention, most of the nitrogen in the pulverized coal can form N2 by the pulverized coal burner, so as to reduce fuel NOx generated by continuous burning of the pulverized coal in the boiler and reduce the emission of NOx from the pulverized coal boiler.
Description
Technical field
The present invention relates to a kind of pulverized coal combustion, particularly a kind of coal burner also relates to the pulverized-coal fired boiler that comprises this coal burner.
Background technology
Protect under the increasingly serious situation of problem at current environment, the discharge capacity that how to reduce nitrogen oxide in the pulverized-coal fired boiler running (NOx) is one of important topic that will solve.
The NOx that discharges in the pulverized-coal fired boiler operation process generally is meant NO and NO
2Wherein the overwhelming majority is NO, and behind the downstream or discharging of flame zone, the NO of a part can be converted into NO
2The nitrogen oxide that produces in the process of coal combustion (NOx) can be divided into heating power type, quick type and fuel type; Wherein, fuel type NOx refers to the NOx that the nitrogen in the coal dust generates through a series of oxidation-reduction reaction in combustion process, and it is the main source of NOx in the process of coal combustion, accounts for 80%～90% of total NOx discharge capacity.Therefore, the key of the discharge capacity of minimizing NOx is to reduce the discharge capacity of fuel type NOx; And the main mode that reduces fuel type NOx discharge capacity is to make coal dust in the low oxygen concentration zonal combustion, makes the nitrogen in the coal dust form N
2, to reduce the NOx discharge capacity.For this reason, some technical schemes are disclosed in the prior art.
PM (pollution minimum) bias DC burner like MIT (MHI).This PM bias DC burner utilizes the guide functions of elbow to form the Pulverized Coal Concentration device; Breeze airflow is divided into dense phase pulverized coal air-flow and two strands of light breeze airflows mutually; And the dense phase pulverized coal air-flow is burnt in the environment of rich fuel; Form the volatile combustion district, make coal dust carry out the reproducibility reaction, with the growing amount of control NOx.The outlet of PM bias DC burner is provided with bluff body, near the outlet of this burner, to form the backflow of high-temperature flue gas; The effect of this structure is: the one, and through high-temperature flue gas breeze airflow is caught fire in advance; The 2nd, postpone mixing of a wind (wind powder mixture) and secondary wind; Prolong coal dust in the time of staying in volatile combustion district, promptly prolong the reduction reaction time, make more fuel type NOx be reduced into N
2So just near the outlet of this burner, form the local air fractional combustion, to suppress the generation of NOx.
Another kind is the horizontal rich-lean direct current burner of domestic Harbin Institute of Technology.This horizontal rich-lean direct current burner is the Pulverized Coal Concentration device that the leaf grating isolating construction (shutter shape structure) that is utilized in the burner set inside forms; Horizontal direction at burner outlet is divided into dense phase pulverized coal air-flow and two strands of light breeze airflows mutually with breeze airflow; Make the dense phase pulverized coal air-flow carry out fuel-rich combustion; Carry out the reproducibility reaction, with the generation of control NOx.The dense phase pulverized coal air-flow of a wind (wind powder mixture) air-flow is at the counter-fire face; Coal dust catches fire in advance; Light phase breeze airflow is positioned at the fiery face of the back of the body, postpones mixing of a wind (wind powder mixture) and secondary wind, makes combustion product time of staying prolongation in the volatile combustion district of rich fuel; Promptly prolong the reduction reaction time, make more fuel type NOx be reduced into N
2, to suppress the generation of NOx.
In the technical scheme of above-mentioned reduction NOx discharging, coal dust all is near the outlet of burner, burns under the mode of burning in addition; This mode is added the influence of secondary wind to a wind owing to can't keep the rich fuel environment in the combustion process, has limited the air classification burning and has reduced the effect that NOx discharges.
Summary of the invention
To the deficiency of prior art, first purpose of the present invention is, a kind of coal burner is provided, more effectively to reduce the discharge capacity of pulverized-coal fired boiler NOx.
Second purpose of the present invention is to provide a kind of pulverized-coal fired boiler that comprises above-mentioned coal burner.
In order to realize above-mentioned first purpose; The Pulverized Coal Concentration section and the main paragraph that link to each other before and after coal burner provided by the invention comprises; Said Pulverized Coal Concentration section has the Pulverized Coal Concentration device, forms through-flow of dense phase pulverized coal and the through-flow portion of light coal dust mutually in the said Pulverized Coal Concentration section; Coal burner also comprises the igniting thermal source; Have the dividing plate that extends along the coal dust flow direction in the said main paragraph, said dividing plate is divided into dense phase pulverized coal passage and the light passage of coal dust mutually at least with the space in the said main paragraph; The rear end that said dense phase pulverized coal is through-flow and the rear end of through-flow of light phase coal dust are corresponding with the front end of the front end of said dense phase pulverized coal passage and light phase coal dust passage respectively; Said igniting thermal source is arranged in through-flow of dense phase pulverized coal or dense phase pulverized coal passage.
Optional, said coal burner also comprises the quick igniting device, and said quick igniting device comprises that the front end passage section equals straight tube or the front end passage section of the rear end passage section awl tube greater than the rear end passage section; Said igniting thermal source is arranged in said awl tube or straight tube.
Optional; Said coal burner also comprises converging transition and the convergent dividing plate that extends along the coal dust flow direction; Said convergent dividing plate is divided into convergent dense phase pulverized coal passage and the light coal dust mutually of convergent passage with the space in the said converging transition, and the passage section of the front end of said convergent dense phase pulverized coal passage is greater than the passage section of its rear end; The front end of the front end of said convergent dense phase pulverized coal passage and the light coal dust mutually of convergent passage communicates with the rear end of the light passage of coal dust mutually with the rear end of said dense phase pulverized coal passage respectively.
Optional; Said coal burner also comprises stable section and the stable section dividing plate that extends along the coal dust flow direction; Said stable section dividing plate is divided into stable section dense phase pulverized coal passage and the light coal dust mutually of stable section passage with the space in the said stable section, and the passage section of the front end of said stable section dense phase pulverized coal passage equals the passage section of its rear end; The front end of the front end of said stable section dense phase pulverized coal passage and the light coal dust mutually of stable section passage communicates with the rear end of the light coal dust mutually of convergent passage with the rear end of said convergent dense phase pulverized coal passage respectively.
Optional, said Pulverized Coal Concentration device comprises elbow, urceolus and is positioned at the inner core of urceolus, and the front-end and back-end of said urceolus join with the front end of said elbow rear end and main paragraph respectively; Said inner core comprises the conical cylinder section of the passage section of front end less than the passage section of rear end; Said conical cylinder section rear end links to each other with the front end of dense phase pulverized coal passage, and front end communicates with the part of said elbow rear end deflection outer arc.
Optional, said Pulverized Coal Concentration device also comprises the shrinkage cavity section of the passage section of front end greater than the passage section of rear end; The rear end of said shrinkage cavity section and the front end of said inner core join, and the part of the deflection outer arc of the front end of said shrinkage cavity section and the rear end of said elbow is relative.
Optional, said inner core also comprises the polyphone bend pipe, said polyphone bend pipe comprises two bend pipes continuous, that wrap direction is opposite; The part of the deflection outer arc of the front end of said polyphone bend pipe and the rear end of said elbow is relative, and the front end of rear end and said conical cylinder section joins.
Optional, be furnished with deflector in the said polyphone bend pipe; At the flow direction of breeze airflow, the trend of deflector is parallel with the center line of polyphone bend pipe.
Optional, also be provided with flow-disturbing spare in the said dense phase pulverized coal passage; On the breeze airflow flow direction, the passage section of said flow-disturbing spare is variable.
Optional, the internal face of said dense phase pulverized coal passage also is provided with the refractory lining of being processed by ceramic material.
Optional, the internal face of said dense phase pulverized coal passage is provided with pore, and said pore links to each other with predetermined source of the gas.
Optional, said dividing plate forms tubular structure; Said dividing plate inner chamber forms the dense phase pulverized coal passage, the light passage of coal dust mutually of formation between said dividing plate outside wall surface and the main paragraph internal face.
In order to realize above-mentioned second purpose, pulverized-coal fired boiler provided by the invention comprises burner hearth and above-mentioned any coal burner, and said coal burner is installed on the burner hearth.
Compared with prior art; Coal burner provided by the invention comprises Pulverized Coal Concentration section and main paragraph; Be provided with the Pulverized Coal Concentration device in the said Pulverized Coal Concentration section; The Pulverized Coal Concentration device can carry out deep or light separation to the breeze airflow in the wind, makes breeze airflow form dense phase pulverized coal air-flow and light breeze airflow mutually; The flow passage component of dense phase pulverized coal air-flow and light breeze airflow mutually forms through-flow of dense phase pulverized coal and the through-flow portion of light coal dust mutually; In addition; Dividing plate in the main paragraph is divided into two passages of dense phase pulverized coal passage and the light passage of coal dust mutually at least with space in the main paragraph, and the rear end of the rear end of through-flow of dense phase pulverized coal and through-flow of light phase coal dust is corresponding with the front end of the front end of said dense phase pulverized coal passage and light phase coal dust passage respectively; In through-flow of dense phase pulverized coal or dense phase pulverized coal passage, also be provided with the igniting thermal source.Like this; Breeze airflow in wind is through the Pulverized Coal Concentration section time; After forming dense phase pulverized coal air-flow and light breeze airflow mutually, the dense phase pulverized coal air communication is crossed through-flow of dense phase pulverized coal and is got in the dense phase pulverized coal passage, and arrives in the boiler furnace through the outlet that the dense phase pulverized coal channel flow goes out coal burner; When the dense phase pulverized coal air communication is crossed the position at igniting thermal source place, the igniting thermal source will make the burning of dense phase pulverized coal steady air current; Because dividing plate makes dense phase pulverized coal air-flow and light phase breeze airflow keep separating, and so just can guarantee that the dense phase pulverized coal air-flow forms good reducing atmosphere in the dense phase pulverized coal passage, make the nitrogen in the coal dust in combustion process, generate N through a series of reaction
2Compare with the technical scheme that prior art provides; When utilizing coal burner provided by the invention; Most of coal dust in the wind (forming the dense phase pulverized coal air-flow) is before arriving the coal burner outlet; Just under the reducing atmosphere of the dense phase pulverized coal passage of coal burner, carried out reaction comparatively fully, made that more nitrogen forms N in the coal dust
2Simultaneously; Because dividing plate is isolated the dense phase pulverized coal air-flow with light breeze airflow mutually by force; Can avoid light phase breeze airflow that the reducing atmosphere of dense phase pulverized coal air-flow is produced harmful effect; The time of staying of dense phase pulverized coal air-flow under reducing atmosphere prolonged, thus the N that the more nitrogen in the coal dust is formed
2Like this, when utilizing coal burner provided by the invention, more nitrogen can form N in the coal dust
2And then, so just the fuel type NOx that coal dust burns away and produced can be reduced in boiler, and then the discharge capacity of pulverized-coal fired boiler NOx can be more effectively reduced.
In further technical scheme, comprise also and the corresponding quick igniting device of igniting thermal source that the quick igniting device comprises straight or the awl tube that is enclosed within igniting thermal source outside.The quick igniting device can make the igniting thermal source that near breeze airflow is lighted fast, and the stability and the reliability of the burning hot source point fire of guarantee point.
In further technical scheme, the convergent dividing plate that converging transition is set behind main paragraph and extends along the coal dust flow direction forms the convergent dense phase pulverized coal passage of the passage section of front end greater than the passage section of its rear end; Can improve the flowing velocity of the pulverized coal flame of dense phase pulverized coal gas stream burning formation like this, improve the momentum of pulverized coal flame, satisfy the needs of boiler furnace internal combustion tissue.
In further technical scheme, the stable section dividing plate that the converging transition rear end is provided with stable section and extends along the coal dust flow direction, the passage section that forms front end equals the stable section dense phase pulverized coal passage of the passage section of its rear end; Can increase the rigidity of pulverized coal flame like this, satisfy the needs of burning tissue in the boiler furnace, improve the stability of boiler furnace coal dust firing, prevent the slagging scorification of burner region wall.
In further technical scheme, the Pulverized Coal Concentration device comprises elbow, urceolus and is positioned at the inner core of urceolus; And making space in the said inner core form at least a portion of through-flow of said dense phase pulverized coal, inner core and the space between the urceolus form at least a portion of through-flow of light coal dust mutually.This technical scheme can utilize inner core that the dense phase pulverized coal air-flow is isolated with light breeze airflow mutually, avoids the dense phase pulverized coal air-flow to mix in advance with light breeze airflow mutually.
In further technical scheme, the shrinkage cavity section is set between the rear end of inner core front end and elbow; The shrinkage cavity section can produce the current-sharing effect to the dense phase pulverized coal air-flow, make the coal dust more even distribution in the dense phase pulverized coal air-flow, for the reduction of nitrogen oxide provides advantage.
In further technical scheme, in said dense phase pulverized coal passage, also be provided with on the breeze airflow flow direction, passage section has the flow-disturbing spare of predetermined variation; Can form flow-disturbing to pulverized coal flame like this, make the temperature field in the dense phase pulverized coal passage more even; Promote coal dust in enrichment coal dust, hypoxemia and suitable temperature conditions burning down, making in the coal dust more, the nitrogen element transformation is N
2
In further technical scheme, the internal face of dense phase pulverized coal passage is provided with the refractory lining of being processed by ceramic material; On the one hand, can improve the wearability of dense phase pulverized coal vias inner walls like this and prevent high temperature corrosion, thereby improve the service life of coal burner; On the other hand,, can keep the temperature of dense phase pulverized coal passage like this,, make the more nitrogen in the coal dust be converted into N for breeze airflow provides more excellent environment in the burning under the hypoxia condition because the refractory lining that ceramic material is processed has lower heat conductivity
2
In further technical scheme, the internal face of said dense phase pulverized coal passage is provided with pore, and said pore communicates with predetermined source of the gas.Air with predetermined pressure is imported; The air that imports not only can stir the dense phase pulverized coal air-flow, makes the temperature field in the dense phase pulverized coal passage more even, can also cool off the inwall of dense phase pulverized coal passage; Purge the dust stratification on the dense phase pulverized coal vias inner walls, prevent slagging scorification.
Providing on the basis of above-mentioned coal burner, a kind of pulverized-coal fired boiler that comprises this coal burner also is provided,, comprising that the pulverized-coal fired boiler of this coal burner also has corresponding technique effect because coal burner has above-mentioned technique effect.
Description of drawings
Fig. 1 is the structural representation of a kind of coal burner of providing of the embodiment of the invention one;
Fig. 2 is the structural representation of a kind of coal burner of providing of the embodiment of the invention two;
Fig. 3 is the enlarged drawing of the quick igniting device among Fig. 2, and the position relation of quick igniting device and igniting thermal source is shown simultaneously;
Fig. 4 is the structural representation of a kind of coal burner of providing of the embodiment of the invention three;
Fig. 5 is the structural representation of a kind of coal burner of providing of the embodiment of the invention four.
The specific embodiment
Describe the present invention below in conjunction with accompanying drawing, the description of this part only is exemplary and explanatory, should any restriction not arranged to protection scope of the present invention.In the presents, the noun of locality " preceding " and " back " are that the flow direction with breeze airflow is reference, before the position that breeze airflow arrives earlier is, after the position that the back arrives is.
Embodiment one
Please refer to Fig. 1, this figure is the structural representation of a kind of coal burner of providing of the embodiment of the invention one.This coal burner comprises parts such as double-layer barrel 200, Pulverized Coal Concentration section 100 and igniter 300.Pulverized Coal Concentration section 100 can be carried out deep or light separation with the breeze airflow of a wind, forms dense phase pulverized coal air-flow and light breeze airflow mutually, and double-layer barrel 200 can provide the space for the burning of dense phase pulverized coal air-flow, and igniter 300 is used for the dense phase pulverized coal air-flow is lighted.
Double-layer barrel 200 comprises main paragraph 220 and the dividing plate 210 that is positioned at main paragraph 220; Dividing plate 210 extends along the coal dust flow direction, with being divided into dense phase pulverized coal passage 211 and the light passage of coal dust mutually 221 in the main paragraph 220.In this example, main paragraph 220 is that the cross section is circular tubular structure with dividing plate 210, and the two center line roughly overlaps formation double-layer barrel structure; Dividing plate 210 inner chambers form dense phase pulverized coal passage 211, the light passage of coal dust mutually 221 of formation between dividing plate 210 outside wall surface and main paragraph 220 internal faces.
Pulverized Coal Concentration section 100 comprises elbow 110, urceolus 120 and is positioned at the conical cylinder section 130 of urceolus 120.The front-end and back-end of urceolus 120 join with the front end of elbow 110 rear ends and main paragraph 210 respectively.In this example, the passage section of conical cylinder section 130 front ends is less than the passage section of its rear end.Conical cylinder section 130 rear ends and cross section are that dividing plate 220 front ends of tubular structure join, and the part of front end and the deflection outer arc of elbow 110 rear ends relatively and communicate.Elbow 110, urceolus 120 and conical cylinder section 130 form the Pulverized Coal Concentration device of this coal burner; Conical cylinder section 130 forms the inner core of Pulverized Coal Concentration device.
Igniter 300 comprises igniter body 320 and igniting thermal source 310.In this example, igniter 300 is a plasma generator, forms igniting thermal source 310 in the plasma generator rear end; The igniting thermal source is arranged in the correct position of conical cylinder section 130, is preferably placed on conical cylinder section 130 center lines.Igniter 300 can be other ignition mechanism, as long as can produce corresponding heat, dense phase pulverized coal is ignited just can realize the object of the invention.
The operation principle of this embodiment is: the breeze airflow in wind is through elbow 110 time; Elbow 110 utilizes the inertia of pulverized coal particle in the breeze airflow; Realize the deep or light separation of breeze airflow; Forming dense phase pulverized coal air-flow and light breeze airflow mutually near elbow 110 rear ends, the dense phase pulverized coal air-flow is formed at the part of the deflection outer arc of elbow 110 rear ends, and light phase breeze airflow is formed at the part of the deflection inner arc of rear end; Because conical cylinder section 130 front ends communicate with the part of the deflection outer arc of elbow 110 rear ends; The dense phase pulverized coal air-flow gets in the conical cylinder section 130; Light phase breeze airflow gets into the space between urceolus 120 and the conical cylinder section 130; Make dense phase pulverized coal air-flow and light phase breeze airflow keep separating, thus in Pulverized Coal Concentration section 100 through-flow 121 of through-flow 131 of formation dense phase pulverized coal and light coal dust mutually.When the dense phase pulverized coal air communication was crossed conical cylinder section 130, igniting thermal source 310 was lighted the dense phase pulverized coal air-flow, and the dense phase pulverized coal air-flow is taken fire, and gets in the dense phase pulverized coal passage 211 that is formed by dividing plate 210, and burns away; After the burning of dense phase pulverized coal passage, flow out coal burner again and get in the burner hearth of boiler; Simultaneously, light phase breeze airflow also flows out coal burner entering boiler furnace internal combustion through light phase coal dust passage 221.
Description according to its operation principle can be confirmed; Igniting thermal source 310 is not limited to be arranged in conical cylinder section 130; Also can make igniting thermal source 310 be arranged in dense phase pulverized coal passage 211 according to actual needs, preferably be placed in the dense phase pulverized coal passage 211 position near front end.Certainly, can be according to the ignition intensity in the burning hot source 310 of coal dust characteristic selected element, to guarantee the reliability of igniting; In the optimized technical scheme, can make igniter 300 continuous firings, routinely to light the dense phase pulverized coal air-flow.
The principle that above-mentioned coal burner reduces the NOx discharge capacity of pulverized-coal fired boiler is: the oxygen amount in wind can not satisfy the needs of coal dust completing combustion wherein far away; Breeze airflow is through the deep or light after separating of elbow 110, and the oxygen amount of dense phase pulverized coal air-flow further reduces; Lighted a fire after thermal source 310 lights at the dense phase pulverized coal air-flow, got into that burning can produce strong reducing atmosphere in the dense phase pulverized coal passage 211.The formation mechanism of based on fuel type NOx, fuel type NOx is the pyridine (C in the coal dust
5H
5N) and pyrolle (C
4H
5N) separate out to what form after the gas phase, pyridine and pyrolle are converted into N, HCN and NH in gas phase
3, also be converted into NOx simultaneously.The volatile matter that in process of coal combustion, generates, HCN, NH
iWith free radical O, OH, O
2Deng carrying out oxidation reaction, the oxidation reaction of coke nitrogen N generates fuel type NOx (mainly being NO); The burning in, the NO of generation again with volatile matter, HCN, NH
iGenerate N Deng reducing medium generation reduction reaction
2Experiment showed, in the burning situation that the content of oxygen is to existing substantial connection between the finally formation amount of fuel type NOx, the content of oxygen is low more, and the nitrogen in the coal dust is converted into N
2Amount many more, make the nitrogen content in the coal dust that gets in the burner hearth few more, finally reduce the formation amount of fuel type NOx.Dense phase pulverized coal passage 211 is owing to keep isolating with the light passage of coal dust mutually 221, thereby can make the time of staying prolongation of coal dust under hypoxia condition of burning; And along with the minimizing of air capacity, oxygen content reduces, and the reducing atmosphere degree constantly increases, and the nitrogen in the coal dust is converted into N
2Amount many more; This just provides prerequisite for the fuel type NOx discharging that reduces the whole combustion process of coal dust, thereby can reduce the discharge capacity of pulverized-coal fired boiler NOx effectively.
Compared with prior art; In the present embodiment, the dense phase pulverized coal air-flow can be avoided the harmful effect of secondary wind to the dense phase pulverized coal air-flow in dense phase pulverized coal passage 211 internal combustion; Prolong the time of staying of dense phase pulverized coal air-flow under hypoxia condition of fired state, the N that the more nitrogen in the coal dust is formed
2Thereby, for the discharge capacity that more effectively reduces pulverized-coal fired boiler NOx provides condition.
Embodiment two
Please refer to Fig. 2, this figure is the structural representation of a kind of coal burner of providing of the embodiment of the invention two.Different with embodiment one, present embodiment provides coal burner also to comprise double-deck taper 400 and double-deck liptinite 500.
Double-deck taper 400 comprises converging transition 420 and the convergent dividing plate 410 that extends along the coal dust flow direction, and in this example, converging transition 420 and convergent dividing plate 410 are the tubular structure of circular cross-section, and the two center line roughly overlaps the formation double-decker.Convergent dividing plate 410 is divided into the space in the converging transition 420 in the light coal dust mutually of the convergent passage 421 of convergent dense phase pulverized coal passage 411 and ring-type; Wherein, the passage section of convergent dense phase pulverized coal passage 411 front ends is greater than the passage section of its rear end, and the passage section of the light phase coal dust of convergent passage 421 front ends is also greater than the passage section of its rear end.Converging transition 420 front ends and main paragraph 220 rear ends join; Convergent dividing plate 410 front ends and dividing plate 210 rear ends join, and the front end of convergent dense phase pulverized coal passage 411 front ends and the light coal dust mutually of convergent passage 421 is communicated with the rear end of the light passage of coal dust mutually 221 with the rear end of dense phase pulverized coal passage 211 respectively.The dense phase pulverized coal gas stream burning forms pulverized coal flame through convergent dense phase pulverized coal passage 421 time; Because the passage section of convergent dense phase pulverized coal passage 421 front ends is greater than the passage section of its rear end; The flowing velocity that can make the dense phase pulverized coal burning form pulverized coal flame increases; Improve the momentum of pulverized coal flame, to satisfy the needs of boiler furnace internal combustion tissue.
Double-deck liptinite 500 comprises stable section 520 and the stable section dividing plate 510 that extends along the coal dust flow direction, and in this example, stable section 520 and stable section dividing plate 510 are respectively the tubular structure of circular cross-section, and the two center line roughly overlaps the formation double-decker.Stable section dividing plate 510 is divided into stable section dense phase pulverized coal passage 511 and the light coal dust mutually of stable section passage 521 with the space in the stable section 520; And the passage section of stable section dense phase pulverized coal passage 511 front ends is substantially equal to the passage section of its rear end, and the passage section of the light phase coal dust of stable section passage 521 front ends also is substantially equal to the passage section of its rear end.Stable section 520 front ends and converging transition 420 rear ends join; Stable section dividing plate 510 front ends and convergent dividing plate 410 rear ends join, and the front end of stable section dense phase pulverized coal passage 511 front ends and the light coal dust mutually of stable section passage 521 is communicated with the rear end of the light coal dust mutually of convergent passage 421 with the rear end of convergent dense phase pulverized coal passage 411 respectively.Pulverized coal flame is through stable section dense phase pulverized coal passage 511 time; Because the passage section of stable section dense phase pulverized coal passage 511 front ends is substantially equal to the passage section of its rear end; Can make the formation pulverized coal flame more even; And get into boiler furnace in a parallel manner, satisfy the needs of burning tissue in the boiler furnace, and then improve the stability of boiler furnace coal dust firing.
In the present embodiment; Pulverized Coal Concentration device in the Pulverized Coal Concentration section also comprises the shrinkage cavity section 140 of front end passage section greater than the passage section of rear end; And shrinkage cavity section 140 rear ends join with front end as the conical cylinder section 130 of inner core, and front end is relative with the part that outer arc is partial in elbow 110 rear ends.Because shrinkage cavity section 140 front end passage sections are greater than the passage section of rear end, shrinkage cavity section 140 can produce the current-sharing effect to the dense phase pulverized coal air-flow, make the coal dust more even distribution in the dense phase pulverized coal air-flow, for the reduction of nitrogen oxide provides advantage.
In addition, present embodiment also is provided with quick igniting device 600.Like Fig. 3, this figure is the enlarged drawing of the quick igniting device among Fig. 2, and the position relation of quick igniting device and igniting thermal source is shown simultaneously.In this example, quick igniting device 600 comprises the straight tube 620 that the front end passage section joins greater than the awl tube of rear end passage section 610 and front end and awl tube 610 rear ends, and these straight tube 620 front end passage sections and rear end passage section are about equally; And awl tube 610 is enclosed within igniting thermal source 310 outsides.Because the front end passage section of awl tube 610 is greater than the rear end passage section; Bored tube at breeze airflow at 610 o'clock through this; Awl tube 610 can be with further concentrating through near the breeze airflow the igniting thermal source 310; More easily firing coal-dust of thermal source 310 improves the stability and the reliability of igniting so that light a fire; The bus that is appreciated that awl tube 610 is not limited to straight line, also can be curve, to form the awl barrel structure of the curved variation of passage section.Front end passage section and rear end passage section straight 620 adverse effect that can avoid outside breeze airflow facing to the kindling powder about equally is set in awl tube 610 rear ends, improves the combustion stability of the coal dust that catches fire, for follow-up reproducibility burning provides good basis.Under the situation that guarantees igniting back coal dust firing stability, can only realize the purpose of quick igniting with awl tube 610; Front end passage section and rear end passage section straight tube about equally also can only be set, can improve Ignition Stability and reliability equally.Certainly, according to the difference of igniting thermal source 310 positions, quick igniting device 600 also can be arranged on corresponding position.
Embodiment three
Please refer to Fig. 4, this figure is the structural representation of the coal burner that provides of the embodiment of the invention three.Compare with embodiment two; Among the embodiment three; The inner core of its Pulverized Coal Concentration device comprises that also polyphone bend pipe 150. polyphone bend pipes 150 comprise two bend pipes continuous, that wrap direction is opposite, two bend pipe center lines in one plane, thereby form a serpentine tubular structure; The part of the front end of this polyphone bend pipe 150 and the deflection outer arc of elbow 110 rear ends is relative, and rear end and conical cylinder section 130 front ends join; Like this; Conical cylinder section 130 front ends just can communicate with the part of the deflection outer arc of elbow 110 rear ends through the polyphone bend pipe 150 of serpentine tubular structure, get in the Taper Pipe section 130 so that cross polyphone bend pipe 150 through the dense phase pulverized coal air communication in the breeze airflow of deep or light separation.Be furnished with deflector 151 in the polyphone bend pipe 150 of serpentine tubular structure; At the flow direction of breeze airflow, the trend of deflector 151 is parallel with the center line of polyphone bend pipe, and in polyphone bend pipe 150 radial extension; Preferred deflector 151 both sides link to each other with polyphone bend pipe 150 inwalls, and bend pipe 150 inner spaces of will contacting are divided into two parts.Deflector 151 plays the effect to the coal dust water conservancy diversion.Polyphone bend pipe 150 can utilize pulverized coal particle inertia different; Make the dense phase pulverized coal air-flow further carry out deep or light separation; And the higher breeze airflow part of concentration is contacted with igniting thermal source 310; Guarantee the reliability of igniting, the burning hot source 310 of preferred point places the appropriate location near polyphone bend pipe 150 rear ends of serpentine tubular structure.
In addition, in this example, in the dense phase pulverized coal passage, also be provided with from the front end flow-disturbing spare 230 that passage section constantly changes to the rear end.Flow-disturbing spare 230 can have multiple concrete structure; The deflector that forms sharp angle between bearing of trend and the breeze airflow flow direction or back flow plate, platy structures such as current limiting plate that bearing of trend is vertical with the breeze airflow flow direction can be set, and can also be the platy structures of perforate.As long as on the breeze airflow flow direction; Flow-disturbing spare 230 passage sections change, and promptly on the breeze airflow flow direction, flow-disturbing spare 230 passage sections have predetermined variation; Just can make the part breeze airflow change flow direction; Pulverized coal flame is formed flow-disturbing, make the temperature field in the dense phase pulverized coal gas channel more even, and then make that more nitrogen changes N in the coal dust
2Certainly, in other embodiments, also suitable flow-disturbing spare 230 can be set.
Embodiment four
Please refer to Fig. 5, this figure is the structural representation of a kind of coal burner of providing of the embodiment of the invention four.Different with the foregoing description; In this example; Main paragraph 220 is not limited to form the double-layer barrel structure with dividing plate 210, and the center line of the dividing plate 210 of tubular structure can offset from body section 220 center lines, and forms light thick coal culm distribution of air flow in the coal burner exit; Burning institutional framework with in the adjustment burner hearth adapts to actual needs.Wherein, Dividing plate 210 is not limited to circular tubular structure, also can be the platy structure that extends along the coal dust flow direction, as long as the space in the main paragraph 220 is divided into two passages; Make dense phase pulverized coal air-flow and light breeze airflow mutually keep isolating, just can realize the object of the invention.Equally, convergent dividing plate 410 also can change with stable section dividing plate 510 accordingly, forms multiple concrete structure.
Description according to above-mentioned each embodiment; Can find out; Realize that the deep or light separation of breeze airflow can also utilize other Pulverized Coal Concentration devices of the prior art to realize in wind; Such as being the disclosed shutter Pulverized Coal Concentration of sharp document CN2157400 device, the disclosed block Pulverized Coal Concentration of patent documentation CN1477330 device or the like; Can also be the combination of a plurality of or multiple Pulverized Coal Concentration device, to satisfy actual needs.
In addition, compared with prior art, because the dense phase pulverized coal passage 211 of coal burner forms the space of coal supply powder burning; In order to satisfy the needs of burning, in the service life of improving coal burner, the refractory lining that can also be processed by ceramic material in the 211 internal face settings of dense phase pulverized coal passage is to satisfy the needs of coal dust firing.When dividing plate 210 cross sections were loop configuration, the position that refractory lining is set can be the inner surface of dividing plate 210; When dividing plate 210 was platy structure, the position that refractory lining is set can be the surface towards dense phase pulverized coal passage 211 of dividing plate 210 and main paragraph 220.Can improve the wearability of dense phase pulverized coal passage 211 inwalls and prevent high temperature corrosion so on the one hand, thereby prolong the service life of coal burner; On the other hand,, can keep the temperature of dense phase pulverized coal passage 211 like this,, the more nitrogen in the coal dust is converted into N for breeze airflow provides more excellent environment in the burning under the hypoxia condition because the refractory lining that ceramic material is processed has lower heat conductivity
2
Same reason, in order to adapt to the needs of dense phase pulverized coal passage 211 as the combustion space, internal face that can also dense phase pulverized coal passage 211 is provided with pore, and this pore is communicated with predetermined source of the gas.Air with predetermined pressure is imported in the dense phase pulverized coal passage 211, and the air of importing not only can stir the dense phase pulverized coal air-flow, can also cool off the inwall of dense phase pulverized coal passage 211, purges dust stratification on dense phase pulverized coal passage 211 inwalls, prevents slagging scorification.Predetermined source of the gas can be provided with pore with the internal face of dense phase pulverized coal passage 211 through light phase coal dust passage 221 and communicate; When dense phase pulverized coal passage 211 inwalls and main paragraph 220 partially overlap, can make predetermined source of the gas directly with dense phase pulverized coal passage 211 internal faces on pore communicate.
On the basis of the above-mentioned coal burner that provides; A kind of pulverized-coal fired boiler also is provided; This pulverized-coal fired boiler comprises burner hearth and above-mentioned any coal burner, and above-mentioned coal burner is installed on the burner hearth, and dense phase pulverized coal passage 211 is communicated with burner hearth with the light passage 221 of coal dust mutually; So that the dense phase pulverized coal air-flow after the reproducibility burning can arrive in the burner hearth, in burner hearth, proceed burning again.Because coal burner has above-mentioned technique effect, comprises that the pulverized-coal fired boiler of this coal burner also has corresponding technique effect.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (13)
1. coal burner, the Pulverized Coal Concentration section and the main paragraph that link to each other before and after comprising, said Pulverized Coal Concentration section has the Pulverized Coal Concentration device, forms through-flow of dense phase pulverized coal and the through-flow portion of light coal dust mutually in the said Pulverized Coal Concentration section, it is characterized in that, also comprises the igniting thermal source; Have the dividing plate that extends along the coal dust flow direction in the said main paragraph, said dividing plate is divided into dense phase pulverized coal passage and the light passage of coal dust mutually at least with the space in the said main paragraph; The rear end that said dense phase pulverized coal is through-flow and the rear end of through-flow of light phase coal dust are corresponding with the front end of the front end of said dense phase pulverized coal passage and light phase coal dust passage respectively; Said igniting thermal source is arranged in through-flow of dense phase pulverized coal or dense phase pulverized coal passage.
2. coal burner according to claim 1 is characterized in that, also comprises the quick igniting device, and said quick igniting device comprises that the front end passage section equals straight tube or the front end passage section of the rear end passage section awl tube greater than the rear end passage section; Said igniting thermal source is arranged in said awl tube or straight tube.
3. coal burner according to claim 1; It is characterized in that; Also comprise converging transition and the convergent dividing plate that extends along the coal dust flow direction; Said convergent dividing plate is divided into convergent dense phase pulverized coal passage and the light coal dust mutually of convergent passage with the space in the said converging transition, and the passage section of the front end of said convergent dense phase pulverized coal passage is greater than the passage section of its rear end; The front end of the front end of said convergent dense phase pulverized coal passage and the light coal dust mutually of convergent passage communicates with the rear end of the light passage of coal dust mutually with the rear end of said dense phase pulverized coal passage respectively.
4. coal burner according to claim 3; It is characterized in that; Also comprise stable section and the stable section dividing plate that extends along the coal dust flow direction; Said stable section dividing plate is divided into stable section dense phase pulverized coal passage and the light coal dust mutually of stable section passage with the space in the said stable section, and the passage section of the front end of said stable section dense phase pulverized coal passage equals the passage section of its rear end; The front end of the front end of said stable section dense phase pulverized coal passage and the light coal dust mutually of stable section passage communicates with the rear end of the light coal dust mutually of convergent passage with the rear end of said convergent dense phase pulverized coal passage respectively.
5. according to each described coal burner of claim 1-4, it is characterized in that said Pulverized Coal Concentration device comprises elbow, urceolus and be positioned at the inner core of urceolus, the front-end and back-end of said urceolus join with the front end of said elbow rear end and main paragraph respectively; Said inner core comprises the conical cylinder section of the passage section of front end less than the passage section of rear end; Said conical cylinder section rear end links to each other with the front end of dense phase pulverized coal passage, and front end communicates with the part of said elbow rear end deflection outer arc.
6. coal burner according to claim 5 is characterized in that, said Pulverized Coal Concentration device also comprises the shrinkage cavity section of the passage section of front end greater than the passage section of rear end; The rear end of said shrinkage cavity section and the front end of said inner core join, and the part of the deflection outer arc of the front end of said shrinkage cavity section and the rear end of said elbow is relative.
7. according to claim 5 or 6 described coal burners, it is characterized in that said inner core also comprises the polyphone bend pipe, said polyphone bend pipe comprises two bend pipes continuous, that wrap direction is opposite; The part of the deflection outer arc of the front end of said polyphone bend pipe and the rear end of said elbow is relative, and the front end of rear end and said conical cylinder section joins.
8. coal burner according to claim 7 is characterized in that, is furnished with deflector in the said polyphone bend pipe; At the flow direction of breeze airflow, the trend of deflector is parallel with the center line of polyphone bend pipe.
9. according to each described coal burner of claim 1-8, it is characterized in that, also be provided with flow-disturbing spare in the said dense phase pulverized coal passage; On the breeze airflow flow direction, the passage section of said flow-disturbing spare has predetermined variation.
10. according to each described coal burner of claim 1-8, it is characterized in that the internal face of said dense phase pulverized coal passage also is provided with the refractory lining of being processed by ceramic material.
11. according to each described coal burner of claim 1-8, it is characterized in that the internal face of said dense phase pulverized coal passage is provided with pore, said pore links to each other with predetermined source of the gas.
12., it is characterized in that said dividing plate forms tubular structure according to each described coal burner of claim 1-8; Said dividing plate inner chamber forms the dense phase pulverized coal passage, the light passage of coal dust mutually of formation between said dividing plate outside wall surface and the main paragraph internal face.
13. a pulverized-coal fired boiler comprises burner hearth, it is characterized in that, also comprises each described coal burner of claim 1-12, said coal burner is installed on the burner hearth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010529378.2A CN102454985B (en) | 2010-11-01 | 2010-11-01 | Pulverized coal burner and pulverized coal boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010529378.2A CN102454985B (en) | 2010-11-01 | 2010-11-01 | Pulverized coal burner and pulverized coal boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102454985A true CN102454985A (en) | 2012-05-16 |
| CN102454985B CN102454985B (en) | 2015-04-08 |
Family
ID=46038446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010529378.2A Active CN102454985B (en) | 2010-11-01 | 2010-11-01 | Pulverized coal burner and pulverized coal boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102454985B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781035A (en) * | 2021-03-18 | 2021-05-11 | 烟台龙源电力技术股份有限公司 | Offset pulverized coal burner and combustion system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0350408A (en) * | 1989-07-17 | 1991-03-05 | Babcock Hitachi Kk | Pulverized coal burner |
| JPH03110308A (en) * | 1989-09-25 | 1991-05-10 | Babcock Hitachi Kk | Pulverized coal feeder |
| CN2126893Y (en) * | 1992-06-23 | 1993-02-10 | 浙江大学 | Large measurement range, variable load, concentration or dilute phase coal powder burning device |
| CN1155052A (en) * | 1996-11-18 | 1997-07-23 | 浙江大学 | Wide-regulatior-ratio multiple-coal-kind thick-thin-phase coal powder cyclone burner |
| EP2172706A1 (en) * | 2007-07-19 | 2010-04-07 | Yantai Longyuan Power Technology Co., Ltd. | A burner ignited by plasma |
| CN201875703U (en) * | 2010-11-01 | 2011-06-22 | 烟台龙源电力技术股份有限公司 | Pulverized coal burner and pulverized coal boiler |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5514487A (en) * | 1994-12-27 | 1996-05-07 | Ballard Power Systems Inc. | Edge manifold assembly for an electrochemical fuel cell stack |
| JP3110308B2 (en) * | 1996-04-03 | 2000-11-20 | 株式会社ユニックス | Partition structure |
-
2010
- 2010-11-01 CN CN201010529378.2A patent/CN102454985B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0350408A (en) * | 1989-07-17 | 1991-03-05 | Babcock Hitachi Kk | Pulverized coal burner |
| JPH03110308A (en) * | 1989-09-25 | 1991-05-10 | Babcock Hitachi Kk | Pulverized coal feeder |
| CN2126893Y (en) * | 1992-06-23 | 1993-02-10 | 浙江大学 | Large measurement range, variable load, concentration or dilute phase coal powder burning device |
| CN1155052A (en) * | 1996-11-18 | 1997-07-23 | 浙江大学 | Wide-regulatior-ratio multiple-coal-kind thick-thin-phase coal powder cyclone burner |
| EP2172706A1 (en) * | 2007-07-19 | 2010-04-07 | Yantai Longyuan Power Technology Co., Ltd. | A burner ignited by plasma |
| CN201875703U (en) * | 2010-11-01 | 2011-06-22 | 烟台龙源电力技术股份有限公司 | Pulverized coal burner and pulverized coal boiler |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781035A (en) * | 2021-03-18 | 2021-05-11 | 烟台龙源电力技术股份有限公司 | Offset pulverized coal burner and combustion system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102454985B (en) | 2015-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102287819B (en) | Porous medium combustor for low-caloric-value gas fuel | |
| CN102305415B (en) | Plasma oil-free ignition system in oxygen-enriched environments | |
| CN101846315B (en) | Coal dust concentration device and coal dust burner with same | |
| CN104501145A (en) | Self-preheating and sectionalized pulverized coal combustion low-NOx combustion device and method | |
| CN102628589B (en) | High-temperature and low-NOX combustion method and device for pulverized coal | |
| CN204678328U (en) | combustion powder industrial boiler | |
| CN102620291A (en) | Pulverized coal decoupling combustor with low nitrogen oxide discharge and pulverized coal decoupling combustion method with low nitrogen oxide discharge | |
| JP2016191544A (en) | Method for combustion management in firing installations and firing installation | |
| CN101403497B (en) | Micro-oil ignition rotational flow breeze combustion device for preventing slag bonding of primary combustion chamber | |
| CN109931605B (en) | Multistage air distribution radial outer thick and inner thin cyclone burner | |
| CN201137933Y (en) | Low NOx coal fines thick and thin oil-saving burner | |
| CN201875703U (en) | Pulverized coal burner and pulverized coal boiler | |
| CN110173692A (en) | A kind of ultralow nitrogen combustion system for fuel gas with low heat value | |
| CN106090894A (en) | The all-oxygen combustion device of a kind of low NOx and combustion method thereof and application | |
| CN102563635B (en) | Pulverized coal flame preheating combustion device | |
| CN102454984A (en) | Air duct ignition system and under-bed ignition burner | |
| CN208108090U (en) | A kind of ultralow nitrogen metal fiber surface combustor | |
| CN103836620A (en) | Oxygen-enriched micro-oil fractional combustion device | |
| CN100585276C (en) | Side direction multilevel open type igniting center powder feeding vortex combustor of small oil mass gasification combustion | |
| CN106224960A (en) | A kind of heat accumulation type radiant tube gradual combustor and combustion method thereof | |
| CN102454985B (en) | Pulverized coal burner and pulverized coal boiler | |
| CN206055625U (en) | A kind of heat accumulation type radiant tube gradual combustor | |
| CN212456816U (en) | Burner and W flame boiler | |
| CN201145271Y (en) | Third-order coal-powder combustor | |
| CN201875702U (en) | Coal burner and boiler |
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 |