CN202546747U - Coal feeder, coal feeding system and circulating fluidized bed boiler - Google Patents
Coal feeder, coal feeding system and circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN202546747U CN202546747U CN2012200886860U CN201220088686U CN202546747U CN 202546747 U CN202546747 U CN 202546747U CN 2012200886860 U CN2012200886860 U CN 2012200886860U CN 201220088686 U CN201220088686 U CN 201220088686U CN 202546747 U CN202546747 U CN 202546747U
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- coal
- bellows
- feeder
- air outlet
- chute
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- 239000003245 coal Substances 0.000 title claims abstract description 181
- 230000002787 reinforcement Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 7
- 238000003466 welding Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000004939 coking Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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Abstract
The utility model discloses a coal feeder which comprises an air box (1), a first coal conveying pipe (2) and a second coal conveying pipe (3). The air box (1) surrounds the first coal conveying pipe (2). Two ends of the air box are connected with the first coal conveying pipe and the second coal conveying pipe respectively. An air inlet (4) and an air outlet (5) are reserved on the air box. The air outlet is communicated with the second coal conveying pipe. A frustum is formed at the connection of the air box and the air outlet. Cross section area of the frustum decreases from a direction away from the air outlet to a direction close to the air outlet. In addition, the utility model further discloses a coal feeding system with the coal feeder for a circulating fluidized bed boiler and the circulating fluidized bed boiler. By the frustum of the coal feeder, a conical tapering jet type air duct is formed to enable the coal feeding system to operate under a negative pressure condition, and backlash of heat smoke in a hearth into the coal feeding system along material returning legs is effectively prevented.
Description
Technical field
The utility model relates to field of boilers, particularly, and the coal supply system that is used for CFBB and the CFBB that relate to a kind of coal feeder and comprise this coal feeder.
Background technology
Along with Combustion technology of circulating fluidized is constantly ripe and progressive, along with the further raising of human environmental consciousness, CFBB is widely used gradually.The coal supply system of CFBB is mainly taked two kinds of coal-feeding modes: a kind of is back wall material returning device coal-feeding mode, and another kind is the front wall coal-feeding mode.The course of work of back wall material returning device coal-feeding mode is following: the coal that run coal bin gets off is successively through belt coal-feeding machine and scraper plate feeder; And through in the insertion plate door entering coal spout; Coal through coal spout gets into via coal feeder in the returning charge leg of material-returning device then, in the returning charge leg, mixes the back with circulating ash and gets into burner hearth.As shown in Figure 1; Existing coal feeder comprises bellows 1, first coal chute 2 and second coal chute 3; Said bellows 1 are arranged around said first coal chute 2; The two ends of said bellows 1 are connected with second coal chute 3 with said first coal chute 2 respectively, and said bellows 1 are provided with air inlet 4 and air outlet 5, and said air outlet 5 communicates with said second coal chute 3.As shown in Figure 1, coal spread wind gets in the bellows 1 through air inlet 4, and gets in second coal chute 3 through air outlet 5, and is mobile along the tube wall of second coal chute 3.Because coal spread wind can only flow along the tube wall of second coal chute 3; So coal spread wind can not contend with hot flue gas in the burner hearth; Cause easily that hot flue gas recoils into coal supply system along the returning charge leg in the burner hearth; Near coal feeder, mix the back partial combustion takes place, cause the coking of returning charge leg, cause coal spout even scraper plate coal supply machine burning red with fire coal and circulating ash.Because the frequent burning of coal spout is red, thus coal spout local deformation coking caused, and then cause coal breakage not smooth.In addition; Because coal spout and scraper plate coal supply machine burning are red, thus insertion plate door and the distortion of scraper plate feeder caused, thus reduced the tightness of coal supply system; And the imprecision of coal supply system can aggravate the anti-channeling of hot flue gas in the burner hearth; Thereby cause situation further to worsen, formed vicious circle, influenced the safe and stable operation of boiler.
The utility model content
The purpose of the utility model provides and a kind ofly can prevent effectively that hot flue gas recoils into the coal feeder of coal supply system and coal supply system that is used for CFBB and the CFBB that comprises this coal feeder along the returning charge leg in the burner hearth.
To achieve these goals; The utility model provides a kind of coal feeder, and this coal feeder comprises bellows, first coal chute and second coal chute, and said bellows are arranged around said first coal chute; The two ends of said bellows are connected with second coal chute with said first coal chute respectively; Said bellows are provided with air inlet and air outlet, and said air outlet communicates with said second coal chute, wherein; The part of joining with said air outlet of said bellows forms taper type, and the cross-sectional area of this taper type part diminishes to the direction near said air outlet from the direction away from said air outlet gradually.
Preferably, be provided with the awl section between said taper type part and said first coal chute, the bearing of trend of this awl section is consistent with the bearing of trend of said taper type part, and should awl section and the common air channel that forms of said taper type part.
Preferably, said awl section has sloping portion and horizontal component, and an end of said sloping portion is connected with the outside of said horizontal component, and the other end of said sloping portion and the inboard of said horizontal component are connected with said first coal chute respectively.
Preferably, be connected with reinforcement between said awl section and the said bellows.
Preferably, said reinforcement is a plurality of, and these a plurality of reinforcements evenly distribute along the circumferential direction of said bellows.
Preferably, said bellows are circular bellows.
Preferably, a part of sidewall of said air inlet is connected with the outer surface of said bellows and is tangent, the air intake direction of said air inlet and said a part of parallel sidewalls of said air inlet.
Preferably, the angle between the central axis of said taper type part and said taper type part is 15 degree～35 degree.
In addition; The utility model also provides a kind of coal supply system that is used for CFBB; This coal supply system comprises coal spout, coal feeder and material-returning device; Said coal feeder is arranged between said coal spout and the said material-returning device, and wherein, said coal feeder is the coal feeder that the utility model provided.
In addition, the utility model also provides a kind of CFBB, and this CFBB comprises coal supply system, and wherein, said coal supply system is the coal supply system that is used for CFBB that the utility model provided.
The coal feeder that provides according to the utility model; Because the part of joining with said air outlet of bellows forms taper type, the cross-sectional area of this taper type part diminishes to the direction near said air outlet from the direction away from said air outlet gradually, so can partly form conical taper jetting type air channel through taper type; Thereby coal supply system is moved under negative pressure state; Prevent that effectively hot flue gas recoils into coal supply system along the returning charge leg in the burner hearth, and then prevent that coal spout and scraper plate coal supply machine burning are red, solved the problem of coal supply system hot soak condition; And can prevent the coal spout chute blockage effectively, guarantee the safe and stable operation of boiler.
Other feature and advantage of the utility model will partly specify in the specific embodiment subsequently.
Description of drawings
Accompanying drawing is the further understanding that is used to provide the utility model, and constitutes the part of specification, is used to explain the utility model with the following specific embodiment, but does not constitute the restriction to the utility model.In the accompanying drawings:
Fig. 1 is the positive cross-sectional schematic of existing coal feeder;
Fig. 2 is the positive cross-sectional schematic of the coal feeder that provides of the utility model;
Fig. 3 is the schematic top plan view of the coal feeder that provides of the utility model.
Description of reference numerals
1: bellows; 2: the first coal chutes; 3: the second coal chutes; 4: air inlet; 5: air outlet; 6: the taper type part; 7: the awl section; 8: the air channel; 9: sloping portion; 10: horizontal component; 11: reinforcement.
The specific embodiment
Be elaborated below in conjunction with the specific embodiment of accompanying drawing to the utility model.Should be understood that the specific embodiment described herein only is used for explanation and explains the utility model, is not limited to the utility model.
As shown in Figures 2 and 3; The utility model provides a kind of coal feeder, and this coal feeder comprises bellows 1, first coal chute 2 and second coal chute 3, and said bellows 1 are arranged around said first coal chute 2; The two ends of said bellows 1 are connected with second coal chute 3 with said first coal chute 2 respectively; Said bellows 1 are provided with air inlet 4 and air outlet 5, and said air outlet 5 communicates with said second coal chute 3, wherein; The part 6 of joining with said air outlet 5 of said bellows 1 forms taper type, and the cross-sectional area of this taper type part 6 diminishes to the direction near said air outlet 5 from the direction away from said air outlet 5 gradually.
The coal feeder that provides according to the utility model; Because the part 6 of joining with said air outlet 5 of bellows 1 forms taper type, the cross-sectional area of this taper type part 6 diminishes to the direction near said air outlet 5 from the direction away from said air outlet 5 gradually, so can form conical taper jetting type air channels through taper type part 6; Thereby coal supply system is moved under negative pressure state; Prevent that effectively hot flue gas recoils into coal supply system along the returning charge leg in the burner hearth, and then prevent that coal spout and scraper plate coal supply machine burning are red, solved the problem of coal supply system hot soak condition; And can prevent the coal spout chute blockage effectively, guarantee the safe and stable operation of boiler.
A kind of preferred implementation according to the utility model; Be provided with awl section 7 between said taper type part 6 and said first coal chute 2; The bearing of trend of this awl section 7 is consistent with the bearing of trend of said taper type part 6, and should awl section 7 and the said taper type part 6 common air channels 8 that form.Like this, can further improve the wind-force of coal spread wind through awl section 7 and the taper type part 6 common air channels 8 that form.As shown in Figure 2, awl section 7 is extended with taper type part 6 basically in parallel to each other.
Particularly; Said awl section 7 can have sloping portion 9 and horizontal component 10; One end of said sloping portion 9 for example adopts the mode of welding to be connected with the outside of said horizontal component 10, and the inboard of the other end of said sloping portion 9 and said horizontal component 10 for example adopts the mode of welding to be connected with said first coal chute 2 respectively.
In order to improve the intensity of awl section 7, prevent that air channel 8 from deforming, preferably, be connected with reinforcement 11 between said awl section 7 and the said bellows 1.The two ends of reinforcement 11 can be through for example welding mode be connected with bellows 1 with awl section 7 respectively.Reinforcement 11 can be connected the suitable position of awl section 7 and bellows 1, and for example reinforcement 11 can be connected between the taper type part 6 of horizontal component 10 and bellows 1 of awl section 7.
In order to improve the consolidation effect of reinforcement 11, preferably, said reinforcement 11 is a plurality of, and these a plurality of reinforcements 11 evenly distribute along the circumferential direction of said bellows 1.
Said bellows 1 can be taked various suitable shapes, and are for example square or circular.As shown in Figure 3, in order to make coal spread wind evenly to distribute, preferably, said bellows 1 are circular bellows.Further, a part of sidewall of said air inlet 4 is connected with the outer surface of said bellows 1 and is tangent, the air intake direction of said air inlet 4 and said a part of parallel sidewalls of said air inlet 4.Like this; Can be so that coal spread wind gets in the bellows 1 along the tangential direction of bellows 1; In bellows 1, form high-speed rotational coal supply wind; This high-speed rotational coal supply wind carries and protects raw coal, avoids raw coal to contact with high-temp circulating ash in advance, successfully is reduced near the possibility that takes place raw coal because of the partial combustion that is heated of coal feeder.Said air inlet 4 can be one-body molded with bellows 1, also can adopt the mode of for example welding to be fixedly connected with bellows 1.
The angle of inclination of taper type part 6 can suitably be selected, and in order to form negative pressure better, improves the wind-force of coal spread wind, and preferably, the angle between the central axis of said taper type part 6 and said taper type part 6 is 15 degree～35 degree.
The structure of said first coal chute 2 and second coal chute 3 is conventionally known to one of skill in the art, repeats no more at this.The two ends of bellows 1 can take various suitable modes to be connected with second coal chute 3 with said first coal chute 2 respectively, for example the mode of welding.
In addition; The utility model also provides a kind of coal supply system that is used for CFBB; This coal supply system comprises coal spout, coal feeder and material-returning device; Said coal feeder is arranged between said coal spout and the said material-returning device, and wherein, said coal feeder is the coal feeder that the utility model provided.
Annexation between the structure of said coal spout and material-returning device and said coal feeder and said coal spout and the material-returning device is conventionally known to one of skill in the art, repeats no more at this.
In addition, the utility model also provides a kind of CFBB, and this CFBB comprises coal supply system, and wherein, said coal supply system is the coal supply system that is used for CFBB that the utility model provided.
The course of work of the coal feeder that the utility model specific embodiment provides is following: coal spread wind gets into bellows 1 along the tangential direction of bellows 1; In bellows 1, form high-speed rotational coal supply wind, coal supply wind utilizes the principle of ejector to drive raw coal through air channel 8 and gets in the material-returning device.
The coal feeder that provides according to the utility model specific embodiment; Because the part 6 of joining with said air outlet 5 of bellows 1 forms taper type; The cross-sectional area of this taper type part 6 diminishes to the direction near said air outlet 5 from the direction away from said air outlet 5 gradually; So can form conical taper jetting type air channel through taper type part 6, thereby coal supply system is moved under negative pressure state, prevent that effectively hot flue gas recoils into coal supply system along the returning charge leg in the burner hearth; And then prevent that coal spout and scraper plate coal supply machine burning are red; Solve the problem of coal supply system hot soak condition, and can prevent the coal spout chute blockage effectively, guaranteed the safe and stable operation of boiler.In addition; The coal feeder that provides according to the utility model specific embodiment; Can be so that coal spread wind along in the tangential direction entering bellows 1 of bellows 1, form high-speed rotational coal supply wind in bellows 1, this high-speed rotational coal supply wind carries and protects raw coal; Avoid raw coal to contact with high-temp circulating ash in advance, successfully be reduced near the possibility that takes place raw coal because of the partial combustion that is heated of coal feeder.
More than combine accompanying drawing to describe the preferred implementation of the utility model in detail; But; The utility model is not limited to the detail in the above-mentioned embodiment; In the technical conceive scope of the utility model, can carry out multiple simple variant to the technical scheme of the utility model, these simple variant all belong to the protection domain of the utility model.
Need to prove that in addition each the concrete technical characterictic described in the above-mentioned specific embodiment under reconcilable situation, can make up through any suitable manner.For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out combination in any between the various embodiment of the utility model, as long as its thought without prejudice to the utility model, it should be regarded as content disclosed in the utility model equally.
Claims (10)
1. coal feeder; This coal feeder comprises bellows (1), first coal chute (2) and second coal chute (3); Said bellows (1) arrange that around said first coal chute (2) two ends of said bellows (1) are connected with second coal chute (3) with said first coal chute (2) respectively, and said bellows (1) are provided with air inlet (4) and air outlet (5); Said air outlet (5) communicates with said second coal chute (3); It is characterized in that the part (6) of joining with said air outlet (5) of said bellows (1) forms taper type, the cross-sectional area of this taper type part (6) diminishes to the direction near said air outlet (5) from the direction away from said air outlet (5) gradually.
2. coal feeder according to claim 1; It is characterized in that; Be provided with awl section (7) between said taper type part (6) and said first coal chute (2); The bearing of trend of this awl section (7) is consistent with the bearing of trend of said taper type part (6), and this awl section (7) forms air channel (8) jointly with said taper type part (6).
3. coal feeder according to claim 2; It is characterized in that; Said awl section (7) has sloping portion (9) and horizontal component (10); One end of said sloping portion (9) is connected with the outside of said horizontal component (10), and the inboard of the other end of said sloping portion (9) and said horizontal component (10) is connected with said first coal chute (2) respectively.
4. coal feeder according to claim 2 is characterized in that, is connected with reinforcement (11) between said awl section (7) and the said bellows (1).
5. coal feeder according to claim 4 is characterized in that, said reinforcement (11) is a plurality of, and these a plurality of reinforcements (11) evenly distribute along the circumferential direction of said bellows (1).
6. coal feeder according to claim 1 is characterized in that, said bellows (1) are circular bellows.
7. coal feeder according to claim 6 is characterized in that, a part of sidewall of said air inlet (4) is connected with the outer surface of said bellows (1) and is tangent, said a part of parallel sidewalls of the air intake direction of said air inlet (4) and said air inlet (4).
8. according to any described coal feeder in the claim 1 to 7, it is characterized in that the angle between the central axis of said taper type part (6) and said taper type part (6) is 15 degree～35 degree.
9. coal supply system that is used for CFBB; This coal supply system comprises coal spout, coal feeder and material-returning device; Said coal feeder is arranged between said coal spout and the said material-returning device; It is characterized in that said coal feeder is according to any described coal feeder in the claim 1 to 8.
10. CFBB, this CFBB comprises coal supply system, it is characterized in that, said coal supply system is the coal supply system that is used for CFBB according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200886860U CN202546747U (en) | 2012-03-09 | 2012-03-09 | Coal feeder, coal feeding system and circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200886860U CN202546747U (en) | 2012-03-09 | 2012-03-09 | Coal feeder, coal feeding system and circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202546747U true CN202546747U (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200886860U Expired - Lifetime CN202546747U (en) | 2012-03-09 | 2012-03-09 | Coal feeder, coal feeding system and circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
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| CN (1) | CN202546747U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607021A (en) * | 2012-03-09 | 2012-07-25 | 中国神华能源股份有限公司 | Coal feeder, coal feeding system and circulating fluidized bed boiler |
-
2012
- 2012-03-09 CN CN2012200886860U patent/CN202546747U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607021A (en) * | 2012-03-09 | 2012-07-25 | 中国神华能源股份有限公司 | Coal feeder, coal feeding system and circulating fluidized bed boiler |
| CN102607021B (en) * | 2012-03-09 | 2014-09-17 | 中国神华能源股份有限公司 | Coal feeder, coal feeding system and circulating fluidized bed boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121121 Effective date of abandoning: 20140917 |
|
| RGAV | Abandon patent right to avoid regrant |