CN202581296U - Powder concentrator and combustor comprising same - Google Patents
Powder concentrator and combustor comprising same Download PDFInfo
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- CN202581296U CN202581296U CN 201220140916 CN201220140916U CN202581296U CN 202581296 U CN202581296 U CN 202581296U CN 201220140916 CN201220140916 CN 201220140916 CN 201220140916 U CN201220140916 U CN 201220140916U CN 202581296 U CN202581296 U CN 202581296U
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- elbow
- burner
- powder
- exit face
- air duct
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- 239000000843 powder Substances 0.000 title claims abstract description 47
- 238000002485 combustion reaction Methods 0.000 claims description 17
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 7
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000002817 coal dust Substances 0.000 description 7
- 230000008719 thickening Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
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Abstract
The utility model relates to a powder concentrator and a combustor comprising the same. The powder concentrator comprises an arc elbow and an extension cylinder which is connected with the end of the elbow, wherein the extension cylinder integrally extend toward the outer side of the elbow; and the vertical distance L between the axial line of an outlet surface of the elbow and the axial line of an outlet surface of the extension cylinder and the longitudinal length D of the section of the outlet surface of the elbow satisfy a formula as follows: L=(1/2+/-1/3)D. The powder concentrator is suitable for central powder feeding concentrated and diluted combustors, has a reasonable structure, has the effect of forming favorable coal powder density fields with concentrated center and diluted periphery inside hearths in the combustors and outside nozzles of the combustors, has a simple structure and has higher concentration efficiency and lower resistance when being compared with the prior art.
Description
Technical field
The utility model relates to a kind of powder and concentrates structure and combustion mechanism, particularly relates to a kind of powder inspissator and comprises the burner of this powder inspissator.
Background technology
Coal burner often uses the powder inspissator, and the particle of powder feeding pipes is carried out enrichment, and this process can produce following beneficial technical effects: improve the boiler low load stable combustion ability; Reduce NO
xDischarging; Reduce burner hearth slagging scorification and high temperature corrosion.Can also be applied to realize multistep ignition in plasma igniting or the tiny-oil ignition technology, reduce the fuel consume of boiler startup.
The center gives the powder shading technique when being applied to turbulent burner, can realize efficient, the low NO of coal dust
xBurning (like Chinese patent ZL03111101.7, a kind of center powder-feeding cyclone burner for pulverized coal; Chinese patent ZL200810137200.6, a kind of large speed ratio center powder-feeding cyclone burner for pulverized coal); When being applied to little oil burner (like Chinese patent ZL200810064783.4 small oil mass gasification combustion side direction multilevel open type igniting center powder-feeding swirling burner) and plasma ignition burner (like Chinese patent ZL200710137008.2 plasma ignition burner), can reducing Oil Gun or reduce plasma generator power.
Chinese patent ZL03111101.7; ZL200810137200.6; Center powder-feeding cyclone burner for pulverized coal among the ZL200810064783.4, employing be the taper eseparation ring as the powder inspissator, this inspissator produces the axially Pulverized Coal Concentration effect of symmetry; And all coal dusts can obtain effectively concentrated, but resistance is bigger; The elbow that adopts the band deflector among the ZL200710137008.2 is as the powder inspissator, and resistance is less, but a large amount of coal dusts in the elbow outside do not get into the plasma generator ignition zone, and thickening efficiency is not very desirable.
The utility model content
The purpose of the utility model is to propose a kind of simple in structure, powder inspissator with higher thickening efficiency and lower drag and the burner that comprises this powder inspissator.
A purpose of the utility model is to provide a kind of powder inspissator; Comprise the elbow of arc and the exntension tubs that are connected with said elbow ends; Said exntension tubs extend displacement to the outside of said elbow on the whole, satisfy L=(1/2 ± 1/3) D between the vertical range L between elbow exit face axis and the exntension tubs exit face axis and the longitudinal length D in elbow exit face cross section.
Preferably, when the cross section of elbow was circle, D was an elbow exit face diameter of section; When the cross section of elbow was rectangle, D was the length of outer side edges in the connecting bend of elbow exit face cross section.
More preferably, the length of said exntension tubs is less than 3.3De, and De is the equivalent diameter (De=4A/M, A are area of section, and M is a length around the cross section) of elbow outlet.
Further, said exntension tubs exit face is parallel with said elbow exit face.
Preferably, the bend angles alpha of said elbow satisfies: 60 °＜α＜90 °.
Another purpose of the utility model is to provide a kind of internal combustion ignition burner; It comprises above-mentioned powder inspissator; And burner urceolus, burner inner core and igniter; The exntension tubs exit face of the inlet of said burner urceolus and said powder inspissator is connected, and the burner inner core is positioned at the inside of burner urceolus, and the front end of igniter stretches into burner inner core arrival end.
Preferably, the quantity n of said burner inner core satisfies: 1≤n≤5.
More preferably, said igniter is plasma generator or little oil mass oil gun.
Further, said burner inner core and burner urceolus coaxial arrangement.
The another purpose of the utility model is also providing a kind of center powder-feeding swirling burner; It comprises above-mentioned powder inspissator; And wind assorting cylinder, air duct, interior secondary wind cyclone, interior secondary air duct, outer secondary wind cyclone, the outer secondary air duct of burner; The exntension tubs exit face of said powder inspissator is connected with an air duct inlet; Wherein, a described wind assorting cylinder, air duct, interior secondary wind cyclone, interior secondary air duct, outer secondary wind cyclone, the outer secondary air duct of burner coaxial arrangement from inside to outside.
Based on technique scheme, the utility model has the advantages that:
The powder inspissator of the utility model; The powder shade burner is given at the center of being applicable to; This inspissator has rational structure, can in the burner hearth outside burner inside and the burner nozzle, form the dense thin powdered coal concentration field all around in good center, and simple in structure; Compared with prior art, have higher thickening efficiency and lower resistance.
The internal combustion ignition burner of the utility model, the burner resistance is less, and thickening efficiency is high, and light pulverized coal concentration field around the formation center is dense has good igniting effect, and NO
xDischarge capacity reduces.
The center powder-feeding swirling burner of the utility model, the burner resistance is less, and thickening efficiency is high, and makes coal dust have efficient low NO
xThe combustion efficiency of discharging.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the utility model powder inspissator embodiment;
Fig. 2 is the structural representation of the utility model internal combustion ignition burner embodiment;
Fig. 3 is the structural representation of the utility model center powder-feeding swirling burner embodiment.
The specific embodiment
Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.
Embodiment 1:
Referring to Fig. 1; The preferred embodiment of a kind of powder inspissator of the utility model shown in it; The utility model comprises the two-part structure, promptly comprises arc elbow 1 that links to each other along the airflow direction order and the exntension tubs 2 that are connected with said elbow 1 end, and said exntension tubs 2 extend displacement to the outside of said elbow 1 on the whole; The utility model described " outside " refers to the outwardly-bent outstanding side of arc elbow, and the utility model described " inboard " refers to the arc elbow recessed side that curves inwardly; In Fig. 1, the upper left quarter direction of elbow 1 is " outside ", and the right lower quadrant direction of elbow 1 is " inboard ".Satisfy L=(1/2 ± 1/3) D between the vertical range L between the axis of elbow exit face 11 and exntension tubs exit face 21 axis and the longitudinal length D in elbow exit face 11 cross sections.Preferably, exntension tubs 2 are bend pipe structure, and are as shown in Figure 1.
Further, the length of said exntension tubs 2 is less than 3.3De.De is the equivalent diameter (De=4A/M, A are area of section, and M is a length around the cross section) of elbow outlet.Preferably, the described exntension tubs exit face 21 of present embodiment is parallel with said elbow exit face 11.The bend angles alpha of said elbow 1 satisfies: 60 °＜α＜90 °.
Particularly, the operation principle of present embodiment and the course of work are:
Breeze airflow is after the inlet of elbow 1 bottom gets into elbow 1, and under the effect of centrifugal inertial force, coal dust can flow to the outside of elbow 1.According to research (Xu Tongmo, Hui Shien, " Combustion ", China Machine Press 2011:258), when elbow 1 angle of bend during greater than 60 °, has 90% coal dust to concentrate on the elbow outside approximately, and keeps certain distance.Like this, breeze airflow forms the dense and inboard light pulverized coal concentration field in the elbow outside in the outlet (being elbow exit face 11 places) of elbow, and then flows into exntension tubs 2.According to research; This concentrated effect just can disappear later on greater than 3.3 times of pipeline equivalent diameters at duct length; Because the utility model exntension tubs length is less than 3.3De (De is the equivalent diameter of elbow outlet); And, make the outlet axis of exntension tubs 2 be positioned near the outer point of elbow outlet, therefore owing to satisfy L=(1/2 ± 1/3) D between the longitudinal length D in the axis of the utility model elbow exit face 11 and vertical range L between exntension tubs exit face 21 axis and elbow exit face 11 cross sections; After breeze airflow flows out exntension tubs 2, can go out the dense light breeze airflow concentration field all around in interruption-forming center at exntension tubs 2.
Embodiment 2:
Referring to Fig. 2; The preferred embodiment of a kind of internal combustion ignition burner of the utility model shown in it, this internal combustion ignition burner comprises above-mentioned powder inspissator, and burner urceolus 4, burner inner core 3 and igniter 5; The exntension tubs exit face 21 of the inlet of said burner urceolus 4 and said powder inspissator is connected; Burner inner core 3 is positioned at the inside of burner urceolus 4, and the front end of igniter 5 stretches into burner inner core 3 arrival ends, and is as shown in Figure 2.
Preferably, the quantity n of said burner inner core 3 satisfies: 1≤n≤5.And said igniter 5 can be plasma generator or little oil mass oil gun, and igniter 5 can axially insert also can oblique insertion burner inner core 3.Further, said burner inner core 3 and burner urceolus 4 coaxial arrangement.
Particularly, the operation principle of present embodiment and the course of work are:
Of above-mentioned embodiment 1; Breeze airflow is flowed through behind the powder inspissator; Can be in burner dense, the light breeze airflow concentration field all around in formation center, make burner inner core 3 be the breeze airflow of high concentration thus, burner inner core 3 zone in addition is the low concentration breeze airflow; Under the effect of igniter 5, will form the condition that helps coal powder ignition of high temperature, high coal powder density in the burner inner core 3.And the breeze airflow back flame expansion of catching fire, flow out behind the burner inner core 3 also can ignition burner urceolus 4 in other unlit coal dusts, finally form the coal dust torch.
Because present embodiment has formed the dense light breeze airflow concentration field all around in center in burner, not only can reduce igniter power, but also has formed low inside and high outside approximate axisymmetric temperature field, helps protecting coal burner not by scaling loss.Because the burner central area is a fuel-rich regions, help controlling NOx and generate, therefore, the internal combustion ignition burner of the utility model is a kind of low-NOx combustor.
Embodiment 3:
Referring to Fig. 3; The preferred embodiment of a kind of center of the utility model shown in it powder-feeding swirling burner; This center powder-feeding swirling burner comprises above-mentioned powder inspissator; And wind assorting cylinder 31, air duct 41, interior secondary wind cyclone 51, interior secondary air duct 6, outer secondary wind cyclone 7, the outer secondary air duct 8 of burner; The exntension tubs exit face 21 of said powder inspissator is connected with air duct 41 inlets, and wherein, a described wind assorting cylinder 31, air duct 41, interior secondary wind cyclone 51, interior secondary air duct 6, outer secondary wind cyclone 7, the outer secondary air duct 8 of burner be coaxial arrangement from inside to outside.
Preferably, the quantity m of the utility model wind assorting cylinder 3 satisfies: 1≤m≤5.
Particularly, the operation principle of present embodiment and the course of work are:
Of above-mentioned embodiment 1, breeze airflow is flowed through behind the powder inspissator, can be in burner dense, the light breeze airflow concentration field all around in formation center, make a wind assorting cylinder 3 can be used in the homogenising of avoiding breeze airflow thus.And outside burner nozzle, form approximate axisymmetric breeze airflow concentration field, and the part that breeze airflow concentration is high is positioned at the center, recirculating zone, and coal dust burns under this regional reducing atmosphere, helps controlling NO
xGeneration.In addition, the secondary air separating of present embodiment is inside and outside two strands, form fractional combustion, has postponed mixing of secondary wind and a wind, also helps controlling NO
xGeneration.Further, because the burner of present embodiment has been realized the coincidence in high-temperature and high coal powder density district, help the after-flame of coal dust.Therefore, the center powder-feeding swirling burner of the utility model is also a kind of low NO
xBurner.
Obviously, those of ordinary skill in the art can and comprise the burner of this powder inspissator with a kind of powder inspissator of the utility model, constitutes various types of concentrated mechanisms and combustion mechanism.
Should be noted that at last: above embodiment only in order to the explanation the utility model technical scheme but not to its restriction; Although with reference to preferred embodiment the utility model has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can make amendment to the specific embodiment of the utility model perhaps is equal to replacement to the part technical characterictic; And not breaking away from the spirit of the utility model technical scheme, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (10)
1. powder inspissator; Comprise the elbow (1) of arc and the exntension tubs (2) that are connected with said elbow (1) end; It is characterized in that: said exntension tubs (2) extend displacement to the outside of said elbow (1) on the whole, satisfy L=(1/2 ± 1/3) D between the vertical range L between elbow exit face (11) axis and exntension tubs exit face (21) axis and the longitudinal length D in elbow exit face (11) cross section.
2. powder inspissator according to claim 1 is characterized in that: when the cross section of elbow (1) was circle, D was elbow exit face (a 11) diameter of section; When the cross section of elbow (1) was rectangle, D was the length of outer side edges in the connecting bend of elbow exit face (11) cross section.
3. powder inspissator according to claim 2 is characterized in that: the length of said exntension tubs (2) is less than 3.3De, and De is the equivalent diameter of elbow (1) outlet.
4. according to claim 2 or 3 described powder inspissators, it is characterized in that: said exntension tubs exit face (21) is parallel with said elbow exit face (11).
5. according to claim 2 or 3 described powder inspissators, it is characterized in that: the bend angles alpha of said elbow (1) satisfies: 60 °＜α＜90 °.
6. internal combustion ignition burner; It is characterized in that: comprise the described powder inspissator of above-mentioned any claim; And burner urceolus (4), burner inner core (3) and igniter (5); The exntension tubs exit face (21) of the inlet of said burner urceolus (4) and said powder inspissator is connected, and burner inner core (3) is positioned at the inside of burner urceolus (4), and the front end of igniter (5) stretches into burner inner core (3) arrival end.
7. internal combustion ignition burner according to claim 6 is characterized in that: the quantity n of said burner inner core (3) satisfies: 1≤n≤5.
8. according to claim 6 or 7 described internal combustion ignition burners, it is characterized in that: said igniter (5) is plasma generator or little oil mass oil gun.
9. internal combustion ignition burner according to claim 8 is characterized in that: said burner inner core (3) and burner urceolus (4) coaxial arrangement.
10. center powder-feeding swirling burner; It is characterized in that: comprise the described powder inspissator of above-mentioned any claim; And the outer secondary air duct (8) of a wind assorting cylinder (31), an air duct (41), interior secondary wind cyclone (51), interior secondary air duct (6), outer secondary wind cyclone (7), burner; The exntension tubs exit face (21) of said powder inspissator is connected with an air duct (41) inlet; Wherein, the outer secondary air duct (8) of a described wind assorting cylinder (31), an air duct (41), interior secondary wind cyclone (51), interior secondary air duct (6), outer secondary wind cyclone (7), burner coaxial arrangement from inside to outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220140916 CN202581296U (en) | 2012-04-06 | 2012-04-06 | Powder concentrator and combustor comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220140916 CN202581296U (en) | 2012-04-06 | 2012-04-06 | Powder concentrator and combustor comprising same |
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| Publication Number | Publication Date |
|---|---|
| CN202581296U true CN202581296U (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220140916 Expired - Fee Related CN202581296U (en) | 2012-04-06 | 2012-04-06 | Powder concentrator and combustor comprising same |
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| Country | Link |
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| CN (1) | CN202581296U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836619A (en) * | 2014-02-26 | 2014-06-04 | 上海发电设备成套设计研究院 | Pulverized coal bias flame combustor with adjustable primary wind speed |
-
2012
- 2012-04-06 CN CN 201220140916 patent/CN202581296U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836619A (en) * | 2014-02-26 | 2014-06-04 | 上海发电设备成套设计研究院 | Pulverized coal bias flame combustor with adjustable primary wind speed |
| CN103836619B (en) * | 2014-02-26 | 2016-07-06 | 上海发电设备成套设计研究院 | A kind of primary air velocity scalable pulverized coal bias combustion device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20210406 |