CN202884909U - Material returning device for improving distribution uniformity of materials in large-sized circulating fluidized bed boiler - Google Patents
Material returning device for improving distribution uniformity of materials in large-sized circulating fluidized bed boiler Download PDFInfo
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- CN202884909U CN202884909U CN 201220520429 CN201220520429U CN202884909U CN 202884909 U CN202884909 U CN 202884909U CN 201220520429 CN201220520429 CN 201220520429 CN 201220520429 U CN201220520429 U CN 201220520429U CN 202884909 U CN202884909 U CN 202884909U
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- bed
- feed back
- returning charge
- burner hearth
- battered leg
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Abstract
The utility model provides a material returning device for improving the distribution uniformity of materials in a large-sized circulating fluidized bed boiler. The material returning device comprises a stand pipe, a loosened bed and a loosened bed air chamber, wherein the stand pipe is connected with the lower end of a cyclone separator; the loosened bed is connected with the lower end of the stand pipe; the loosened bed air chamber is communicated with the bottom of the loosened bed; a material returning system further comprises at least two groups of material returning beds which are arranged on the periphery of the loosened bed and are communicated with the loosened bed, at least two groups of material returning bed air chambers which are respectively communicated with the bottoms of the at least two groups of material returning beds, at least two groups of material returning inclined legs which are respectively communicated with the tops of the at least two groups of material returning beds, and hearth connectors which are respectively connected with the at least two groups of material returning inclined legs; and the material returning system is in an asymmetrical structure. The large-sized circulating fluidized bed boiler which is arranged in an M-shaped form and the like adopts the material returning system so as to change and adjust a material returning amount of each material returning inclined leg and solve the problems that solid grains in the large-sized circulating fluidized bed boiler are not uniform so that the temperature is not uniform and the safe, stable and efficient operation of the boiler is influenced.
Description
Technical field
The utility model large circulating fluidized bed boiler technical field is specifically related to a kind of feeding back device that improves material distributing homogeneity in the large circulating fluidized bed boiler stove.
Background technology
Recirculating fluidized bed (CFB) boiler technology, a high-efficiency low-pollution clean burning branch art that develops rapidly in recent ten years, the advantage such as have that combustion with reduced pollutants, fuel tolerance are wide, Load Regulation is good, efficiency of combustion is high, investment and operating cost are relatively low.At present, this technology has obtained widely commercial the application in fields such as station boiler, Industrial Boiler and offal treatment utilizations, and develops to the large circulating fluidized bed boiler of hundreds of thousands multikilowatt scale.At present, 300,000 kilowatts of recirculating fluidized beds have become in the main flow of building the CFB boiler, and putting into operation of 600,000 kilowatts of CFB boilers also entered countdown.
The characteristics of CFBB are: various solid particles show the phenomenon of similar fluid state under the effect of updraft.These solid particles are on the one hand in the inner constantly circulation of burner hearth; The solid particle that leaves from roof of the furnace on the other hand enters cyclone separator, and the solid particle of separating from gas-solid phase is again sent back to burner hearth by material returning valve and participated in burning.By above-mentioned circulation, strong disturbance and mixing between the gas-solid have been guaranteed, and guaranteed time of staying that solid particle is long, so that uniformity of temperature profile in the boiler, thereby for burning with conduct heat good external condition is provided, and provide guarantee for high-efficiency desulfurization, low NOx combustion, prevention boiler coke in the stove.
Yet, in the process that CFBB maximizes, in order to guarantee the higher separative efficiency of separator and to simplify the integrated pot furnace structure and arrange that boiler has adopted the mode of 3 separator arrangement between boiler furnace and back-end ductwork, i.e. M type layout of boiler mode (as shown in Figure 1).A large amount of on-the-spot service datas show, this arrangement exists both sides closed circuit feed back amount large, and the little problem of middle closed circuit feed back amount, cause boiler bed temperature skewness, side grinding in the stove, the desulfuration in furnace decrease in efficiency, the NOx concentration of emission increases, also can affect into the degree that burns of stove coal when serious even cause boiler coke, thereby the safety and stability of harm boiler unit is efficiently moved.
The utility model people studies rear discovery, and the along continuous straight runs solid particle is inhomogeneous in the Large CFB Boiler, may be the main cause that causes this problem.In the inner cyclic process of CFB boiler, can form limit wall stream, and solid particle is when colliding inboard wall of burner hearth, can form and reunite and flow downward, therefore, the circulated material quantity of CFB boiler both sides often is higher than the circulated material quantity at middle part.And when employing has the M type layout of boiler mode of three separators, because the circulated material quantity at middle part is few, therefore the inventory that enters the middle part separator is few, and the inventory of getting back to burner hearth by the material returning valve under the separator of middle part is few, thereby makes the phenomenon of recycle stock skewness more obvious.
In addition, because Large CFB Boiler adopts cooling cyclone separator more, to increase heat-transfer surface, and because the adding of hp fluid air, thereby so that the temperature of the circulating ash of material returning valve outlet is lower than fire box temperature, therefore when the circulating ash quantity at middle part was less, the bed temperature at burner hearth middle part was also just significantly higher, caused the interior emulsion zone temperature deviation of burner hearth larger.And when burner hearth middle part temperature serious when higher, in order to guarantee the unit safety stable and high effective operation, will reduce the coal-supplying amount at burner hearth middle part, the coal-supplying amount of increase burner hearth both sides, thereby further reduced circulated material quantity in the middle part of the burner hearth, make this problem more serious.
Therefore, how improving the uniformity of along continuous straight runs solid particle in the Large CFB Boiler, is CFB boiler problem needing to overcome in the maximization process.This just need to be to existing material returning valve again optimal design.
At present conventional material returning valve comprises L-type material returning valve, U-shaped material returning valve, V-type material returning valve etc., wherein again take U-shaped material returning valve as main, is widely used, but can't solves the problem of recycle stock inequality.
The utility model content
For solving above-mentioned problems of the prior art, the purpose of this utility model is to provide a kind of feeding back device that improves material distributing homogeneity in the large circulating fluidized bed boiler stove, solved solid particle inequality in the large circulating fluidized bed boiler stove, cause non-uniform temperature, affect the problem of boiler safety stable and high effective operation.
For achieving the above object, the utility model adopts following technical scheme to be achieved:
A kind of feeding back device that improves material distributing homogeneity in the large circulating fluidized bed boiler stove, comprise the standpipe 1 that is connected with cyclone separator 7 lower ends, is connected with standpipe loosening bed 10 that the lower end connects and and the loosening bed air compartment 6 that is connected of loosening bed 10 bottoms, described material return system also comprises and is arranged on around the loosening bed 10 and at least two group feed back beds of its connection, the at least two group feed back bed air compartments that at least two group feed back beds bottom is connected respectively, the at least two group returning charge battered legs that at least two group feed back bed tops are connected respectively, the burner hearth interface that is connected respectively with at least two group returning charge battered legs.
Described feeding back device is dissymmetrical structure.
Described feed back bed, feed back bed air compartment, returning charge battered leg and burner hearth interface are two groups.
The both sides of described loosening bed 10 are connected with #1 feed back bed 3 and #2 feed back bed 11, the bottom of #1 feed back bed 3 and #2 feed back bed 11 is connected with #1 feed back bed air compartment 4 and #2 feed back bed air compartment 12 respectively, its top is connected with #1 returning charge battered leg 2 and #2 returning charge battered leg 9 respectively, be air compartment baffle 14 between loosening bed air compartment 6 and #1 feed back bed air compartment 4 and the #2 feed back bed air compartment 12, the end of #1 returning charge battered leg 2 is connected with #1 burner hearth interface 5, and the end of #2 returning charge battered leg 9 is connected with #2 burner hearth interface 13; Be attached with expansion joint 8 at standpipe 1 and cyclone separator 7 junctions, the end of #1 returning charge battered leg 2 and end and #2 burner hearth interface 13 junctions of #1 burner hearth interface 5 junctions and #2 returning charge battered leg 9.
The length of the #2 returning charge battered leg 9 at close burner hearth middle part is greater than the length of the #1 returning charge battered leg 2 of close burner hearth both sides.
The diameter of the #2 returning charge battered leg 9 at close burner hearth middle part is greater than the diameter of the #1 returning charge battered leg 2 of close burner hearth both sides.
Near the channel height between the #2 feed back bed 11 at burner hearth middle part and the loosening bed 10 greater than near the #1 feed back bed 3 of burner hearth both sides and a channel height that becomes flexible between beds 10.
Near the #1 feed back bed 3 height of weir plate H1s of the #2 feed back bed 11 height of weir plate H2 in the middle part of the burner hearth less than close burner hearth both sides.
Described #1 returning charge battered leg 2 and #2 returning charge battered leg 9 are provided with returning charge battered leg control valve 15.
Passage between described #1 feed back bed 3 and #2 feed back bed 11 and the loosening bed 10 is provided with passages regulate valve 16.
Described #1 feed back bed air compartment 4 and #2 feed back bed air compartment 12 are provided with air compartment control valve 17 with loosening bed air compartment 6 porch.
For the M type large circulating fluidized bed boiler with three cyclone separators, below the cyclone separator in both sides, adopt this asymmetric feeding back device, make the returning charge amount near the returning charge battered leg at burner hearth middle part, when suitably surpassing the returning charge amount near the returning charge battered leg of burner hearth both sides, can make the recirculating fluidized bed solid particles inside more even.
Material return system described in the utility model is on the basis of the U-shaped material returning valve of routine, structure for two of standpipe connections and above returning charge battered leg, optionally take multiple asymmetrical design method, as adopt channel height between different returning charge battered leg diameters, returning charge battered leg length, loosening bed and the feed back bed, feed back bed height of weir plate etc. so that certain returning charge battered leg near the returning charge amount at burner hearth middle part greater than the close burner hearth both sides of another returning charge battered leg.In addition, also by between returning charge battered leg, loosening bed and feed back bed, feed back bed air compartment entrance etc. locates to set up control valve, to realize the controllability of returning charge amount.By adopting this material return system at large circulating fluidized bed boilers such as M type arrangement forms, with the returning charge amount that changes and regulate each returning charge battered leg, thereby improve the uniformity that material distributes in the M type large circulating fluidized bed boiler stove, and then the uniformity of the interior Temperature Distribution of assurance stove, for high-efficiency desulfurization, low NOx combustion, prevention boiler coke in efficient burning, efficient heat transfer, the stove provide guarantee.
Outstanding advantages of the present utility model is:
1. by adopting this feeding back device, comprise so that: the length near the #2 returning charge battered leg at burner hearth middle part surpasses the length near the #1 returning charge battered leg of burner hearth both sides; Near the diameter of the #2 returning charge battered leg in the middle part of the burner hearth, surpass the diameter of #1 returning charge battered leg; Near the #2 feed back bed at burner hearth middle part and the channel height between the loosening bed, greater than the channel height between #1 feed back bed and the loosening bed; #2 feed back bed height of weir plate H2 near the burner hearth middle part, less than #1 feed back bed height of weir plate H1, thereby make more recycle stock enter the burner hearth central region, overcome when adopting conventional material returning valve, the circulated material quantity of CFB boiler both sides is higher than the shortcoming of the circulated material quantity at middle part.
2. by returning charge battered leg control valve is set at the returning charge battered leg, passage between feed back bed and loosening bed arranges the passages regulate valve, at feed back air compartment and loosening air compartment porch the air compartment control valve is set, so that the returning charge amount to each returning charge battered leg of material returning valve is carried out independent adjusting, make the concentration of solid particles of CFB boiler horizontal direction more even.
3. in case of necessity can be by three or more returning charge battered legs be set, and corresponding feed back bed and air compartment thereof are set, thus make the concentration of solid particles of CFB boiler horizontal direction more even.
Description of drawings
Fig. 1 is a kind of embodiment of the present utility model, for typical feeding back device, without control valve.
Fig. 2 is a kind of embodiment of the present utility model, for typical feeding back device, with control valve.
Fig. 3 is the schematic diagram that the utility model is applied to M type CFBB; Wherein Fig. 3 a is top view, and Fig. 3 b is upward view.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Embodiment one:
As shown in Figure 1, a kind of feeding back device that is suitable for large circulating fluidized bed boiler of present embodiment, the lower end of standpipe 1 is loosening bed 10, the bottom of loosening bed 10 is connected with loosening bed air compartment 6, the both sides of loosening bed 10 are connected with #1 feed back bed 3 and #2 feed back bed 11, the bottom of #1 feed back bed 3 and #2 feed back bed 11 is connected with #1 feed back bed air compartment 4 and #2 feed back bed air compartment 12 respectively, its top is connected with #1 returning charge battered leg 2 and #2 returning charge battered leg 9 respectively, be air compartment baffle 14 between loosening bed air compartment 6 and #1 feed back bed air compartment 4 and the #2 feed back bed air compartment 12, make between each air compartment separate, thereby can independently regulate.The end of #1 returning charge battered leg 2 is connected with #1 burner hearth interface 5, and the end of #2 returning charge battered leg 9 is connected with #2 burner hearth interface 13; Be attached with expansion joint 8 at standpipe 1 and cyclone separator 7 junctions, the end of #1 returning charge battered leg 2 and end and #2 burner hearth interface 13 junctions of #1 burner hearth interface 5 junctions and #2 returning charge battered leg 9, junction good seal still when guaranteeing variations in temperature.
The length of the #2 returning charge battered leg 9 at close burner hearth middle part is greater than the length of the #1 returning charge battered leg 2 of close burner hearth both sides, so that the end of #2 returning charge battered leg 9 is more near the burner hearth middle part; The diameter of the #2 returning charge battered leg 9 at close burner hearth middle part is greater than the diameter of the #1 returning charge battered leg 2 of close burner hearth both sides; Near the channel height between the #2 feed back bed 11 at burner hearth middle part and the loosening bed 10 greater than near the #1 feed back bed 3 of burner hearth both sides and a channel height that becomes flexible between beds 10; Near the #1 feed back bed 3 height of weir plate H1s of the #2 feed back bed 11 height of weir plate H2 in the middle part of the burner hearth less than close burner hearth both sides; Thereby increase the returning charge amount near the #2 returning charge battered leg at burner hearth middle part.
Embodiment two
As shown in Figure 2, a kind of feeding back device that is suitable for large circulating fluidized bed boiler of present embodiment is provided with returning charge battered leg control valve 15 at #1 returning charge battered leg 2 and #2 returning charge battered leg 9; Passage between #1 feed back bed 3 and #2 feed back bed 11 and loosening bed 10 is provided with passages regulate valve 16; #1 feed back bed air compartment 4 and #2 feed back bed air compartment 12 are provided with air compartment control valve 17 with loosening bed air compartment 6 porch; In order to carry out the adjusting of air quantity and returning charge amount.Other structures are with embodiment one.
As shown in Figure 3, below M type large circulating fluidized bed boiler close the #1 separator and #3 separator of both sides, adopt this asymmetric material return system, so that the returning charge amount of the #2 returning charge battered leg of #1 separator and #3 separator surpasses the returning charge amount of #1 returning charge battered leg, and the returning charge amount that makes each returning charge battered leg is convenient to regulate by each control valve, the final interior solid particle along continuous straight runs of Large CFB Boiler of realizing evenly distributes, and then the uniformity of the interior Temperature Distribution of assurance stove, be efficient burning, efficient heat transfer, high-efficiency desulfurization in the stove, low NOx combustion, the prevention boiler coke provides guarantee.
Claims (10)
1. feeding back device that improves material distributing homogeneity in the large circulating fluidized bed boiler stove, comprise the standpipe (1) that is connected with cyclone separator (7) lower end, be connected 1 with standpipe) the loosening bed (10) that connects of lower end and and the loosening bed air compartment (6) that is connected of loosening bed (10) bottom, it is characterized in that: described material return system also comprise be arranged on loosening bed (10) on every side with at least two group feed back beds of its connection, the at least two group feed back bed air compartments that at least two group feed back beds bottom is connected respectively, the at least two group returning charge battered legs that at least two group feed back bed tops are connected respectively, the burner hearth interface that is connected respectively with at least two group returning charge battered legs.
2. feeding back device according to claim 1, it is characterized in that: described feeding back device is dissymmetrical structure.
3. feeding back device according to claim 2, it is characterized in that: described feed back bed, feed back bed air compartment, returning charge battered leg and burner hearth interface are two groups.
4. feeding back device according to claim 3, it is characterized in that: the both sides of described loosening bed (10) are connected with #1 feed back bed (3) and #2 feed back bed (11), the bottom of #1 feed back bed (3) and #2 feed back bed (11) is connected with #1 feed back bed air compartment (4) and #2 feed back bed air compartment (12) respectively, its top is connected with #1 returning charge battered leg (2) and #2 returning charge battered leg (9) respectively, be air compartment baffle (14) between loosening bed air compartment (6) and #1 feed back bed air compartment (4) and the #2 feed back bed air compartment (12), the end of #1 returning charge battered leg (2) is connected with #1 burner hearth interface (5), and the end of #2 returning charge battered leg (9) is connected with #2 burner hearth interface (13); Be attached with expansion joint (8) at standpipe (1) and cyclone separator (7) junction, the end of #1 returning charge battered leg (2) and end and #2 burner hearth interface (13) junction of #1 burner hearth interface (5) junction and #2 returning charge battered leg (9).
5. feeding back device according to claim 4 is characterized in that: near the length of the #2 returning charge battered leg (9) at burner hearth middle part greater than the length near the #1 returning charge battered leg (2) of burner hearth both sides.
6. feeding back device according to claim 4 is characterized in that: near the diameter of the #2 returning charge battered leg (9) at burner hearth middle part greater than the diameter near the #1 returning charge battered leg (2) of burner hearth both sides.
7. feeding back device according to claim 4 is characterized in that: near the channel height between the #2 feed back bed (11) at burner hearth middle part and the loosening bed (10) greater than #1 feed back bed (3) and a channel height that becomes flexible between bed (10) near the burner hearth both sides.
8. feeding back device according to claim 4 is characterized in that: near #1 feed back bed (3) the height of weir plate H1 of #2 feed back bed (11) the height of weir plate H2 in the middle part of the burner hearth less than close burner hearth both sides.
9. feeding back device according to claim 4 is characterized in that: be provided with returning charge battered leg control valve (15) at described #1 returning charge battered leg (2) and #2 returning charge battered leg (9); Passage between described #1 feed back bed (3) and #2 feed back bed (11) and loosening bed (10) is provided with passages regulate valve (16); Be provided with air compartment control valve (17) at described #1 feed back bed air compartment (4) and #2 feed back bed air compartment (12) with loosening bed air compartment (6) porch.
10. each described feeding back device of claim 1 to 9 is for the cyclone separator below of the M type large circulating fluidized bed boiler both sides with three cyclone separators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220520429 CN202884909U (en) | 2012-10-11 | 2012-10-11 | Material returning device for improving distribution uniformity of materials in large-sized circulating fluidized bed boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220520429 CN202884909U (en) | 2012-10-11 | 2012-10-11 | Material returning device for improving distribution uniformity of materials in large-sized circulating fluidized bed boiler |
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| CN202884909U true CN202884909U (en) | 2013-04-17 |
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| CN 201220520429 Withdrawn - After Issue CN202884909U (en) | 2012-10-11 | 2012-10-11 | Material returning device for improving distribution uniformity of materials in large-sized circulating fluidized bed boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865574A (en) * | 2012-10-11 | 2013-01-09 | 中国华能集团清洁能源技术研究院有限公司 | Material returning system capable of improving distribution uniformity of materials inside large circulating fluidized bed boiler |
-
2012
- 2012-10-11 CN CN 201220520429 patent/CN202884909U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865574A (en) * | 2012-10-11 | 2013-01-09 | 中国华能集团清洁能源技术研究院有限公司 | Material returning system capable of improving distribution uniformity of materials inside large circulating fluidized bed boiler |
| CN102865574B (en) * | 2012-10-11 | 2015-01-07 | 中国华能集团清洁能源技术研究院有限公司 | Material returning system capable of improving distribution uniformity of materials inside large circulating fluidized bed boiler |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130417 Effective date of abandoning: 20150107 |
|
| RGAV | Abandon patent right to avoid regrant |