CN202947127U - Double-outlet material return device for circulating fluidized bed boiler - Google Patents
Double-outlet material return device for circulating fluidized bed boiler Download PDFInfo
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- CN202947127U CN202947127U CN 201220426323 CN201220426323U CN202947127U CN 202947127 U CN202947127 U CN 202947127U CN 201220426323 CN201220426323 CN 201220426323 CN 201220426323 U CN201220426323 U CN 201220426323U CN 202947127 U CN202947127 U CN 202947127U
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- 239000000463 material Substances 0.000 title abstract description 29
- 230000007547 defect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
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- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model relates to a double-outlet material return device for a circulating fluidized bed boiler and belongs to circulating fluidized bed boiler equipment. The double-outlet material return device comprises a vertical dipleg, two moving packed beds, two returning beds and two material returning pipes; each moving packed bed is obliquely arranged and forms an angle being 30-60 degrees with the vertical direction; a moving packed bed air box is arranged at the bottom of each moving packed bed, and a material returning bed air box is arranged at the bottom of each material returning bed; and the two moving packed beds, the two material returning beds and the two material returning pipes form two groups of inverted N-shaped structures. The double-outlet material return device can be used for feeding materials separated by a separator back to a hearth by using fluidized air of the moving packed beds and the material returning beds. The double-outlet material return device has the characteristics of realizing the purpose of adjusting the returned material amount by adopting a structural design of the inclined moving packed beds, effectively overcoming the defect that a supercritical circulating fluidized bed once-through boiler is instable in material return, realizing multi-point material return by adopting a double-outlet structural form and effectively solving the problem that a hearth of a large-scale circulating fluidized bed boiler is uneven in material return.
Description
Technical field
The utility model relates to a kind of feeding back device of CFBB, belongs to the Circulating Fluidized Bed Boiler Equipment technical field.
Background technology
The material circulating system of CFBB is the key of CFB Performance design, material circulating system comprises that mainly raising section, separator and feeding back device consist of, and wherein the service behaviour of feeding back device directly has influence on the safe and stable operation of CFBB.Feeding back device mainly plays two aspects.The solid particle that on the one hand separator is separated is returned the burner hearth of higher pressure by the separator foldback of low pressure, realize reciprocation cycle burning and the reaction of boiler oil and lime stone; On the other hand, form material envelope by recycle stock in the material returning valve dipleg, prevent from that malleation flue gas anti-channeling in stove from entering in the separator of negative pressure to cause the flue gas short circuit, destroy normal combustion and heat transfer in normal Gas-solid Two-phase Flow in separator and stove.
The present domestic and international large-size circulating fluidized bed U-shaped material returning valve that generally adopts.The U valve loop seal that is otherwise known as is made of dipleg, descending standpipe moving bed, horizontal channel, up bubbling bed and refeed line and cloth wind bellows.Practical operation situation shows, U-shaped valve arrangement is simple, reliable, can satisfy well the requirement of stablizing returning charge and sealing, is fit to the layout of CFBB.
U-shaped valve is also referred to as self balance valve, and valve and standpipe are adjusted the flow of solid particle automatically according to the pressure balance relation of self.When recycle stock was many, in down-comer, material level was high, and loosening blast head is corresponding increasing also, can push more material to tedge, adapts to the requirement of high circulating ratio; When recycle stock was few, in down-comer, material level was low, and loosening blast head is also low, and the loopback inventory reduces, and adapts to the requirement of low circulating ratio.This self balance valve is very little to the Flow-rate adjustment effect of solid material, is applicable to the relatively simple subcritical cycle fluid bed natural circulation boiler of inter-boiler process.
Increasingly mature along with Technology of Circulating Fluidized Bed Boiler, supercritical steam circulation and Combustion technology of circulating fluidized combine and show outstanding advantage.Super (super-) critical by CFBB maximizes, and can further improve power supplying efficiency and generate output and reduce pollutant emission, be the important development direction of Combustion technology of circulating fluidized.Practical operation situation shows, due to the complexity of supercritical circulating fluidized bed direct current cooker inter-boiler process, causes furnace pressure fluctuation comparatively frequently to occur.Due to can not active adjustment returning charge uninterrupted, adopt the material returning device of the U-shaped valve of self-balancing the unsettled situation of returning charge to occur because of the furnace pressure fluctuation, cause local fluidization bad and cause coking, even occurring can't returning charge and be forced to blowing out.In addition, along with the increase of recirculating fluidized bed capacity, the boiler breadth depth ratio further increases, and the form of traditional U-shaped valve list outlet makes furnace chamber width returning charge point too concentrated, the returning charge inequality causes width bed press temperature inhomogeneous, and the safe and stable operation of boiler is brought hidden trouble.
The utility model content
The purpose of this utility model is to provide the two outlet of a kind of CFBB feeding back devices, to solve the unstable and returning charge of returning charge that the U-shaped valve of traditional self-balancing occurs along the problem of furnace width inequality under large and super-critical recirculating fluidized bed condition.
The technical solution of the utility model is as follows:
The two outlet of a kind of CFBB feeding back device, this feeding back device comprises vertical dipleg, moving packed bed, returning charge bed and refeed line, it is characterized in that: described moving packed bed, returning charge bed and refeed line are arranged respectively two; Described each moving packed bed is and is in tilted layout, and is 30 °～60 ° angles with vertical direction; Be furnished with the moving packed bed bellows bottom moving packed bed, be furnished with returning charge bed bellows bottom the returning charge bed; Two moving packed beds, two returning charge beds and two refeed lines form two groups of " shape of falling N " structures.
Two groups of symmetrical configuration of falling the N-type described in the utility model are arranged in vertical dipleg both sides.
The utlity model has following outstanding advantages and effect: 1. adopt the moving packed bed that is in tilted layout, the fluidized wind that coordinates the moving packed bed bellows, make the returning charge flow in regulated in wider range, effectively to have overcome the returning charge instability problem that supercritical circulating fluidized bed direct current cooker causes due to the furnace pressure fluctuation; 2. adopt the structural design of double-movement packed bed, two returning charge bed and double back material pipe, realize single-point charging, multiple spot returning charge, effectively improved the problem of large circulating fluidized bed boiler returning charge inequality.
Description of drawings
Fig. 1 is the structural representation of existing U-shaped material returning valve.
The two outlet of a kind of CFBB feeding back device that Fig. 2 provides for the utility model.
The moving packed bed inclination angle of inclined plane schematic diagram of Fig. 3 for tilting.
Fig. 4 is moving packed bed and returning charge bed arrangement schematic diagram.
The vertical standpipe of mark in figure: 1-; The 2-moving packed bed; 3-returning charge bed; The 4-refeed line; 5-moving packed bed bellows; 6-returning charge bed bellows; The 7-horizontal channel.
The specific embodiment
Further illustrate principle of the present utility model, structure and embodiment below in conjunction with accompanying drawing.
As shown in Figure 2, the two outlet of a kind of CFBB that the utility model provides feeding back device comprises vertical dipleg 1, moving packed bed 2, horizontal returning charge bed 3 and refeed line 4.Described moving packed bed 2, returning charge bed 3 and refeed line 4 are arranged respectively two.Be furnished with moving packed bed bellows 5 in moving packed bed 2 bottoms, be furnished with returning charge bed bellows 6 in returning charge bed 3 bottoms; Two moving packed beds 2, two returning charge beds 3 and two refeed lines 4 form the two groups of shape of falling N structures.As shown in Figure 3, described each moving packed bed 2 is and is in tilted layout, and the angle α of its inclined-plane and vertical direction is 30 °～60 °, as shown in Figure 4.Two groups of symmetrical configuration of falling the N-type described in the utility model are arranged in vertical dipleg both sides.
Vertically dipleg 1 is connected with the cyclone separator of CFBB, vertically be connected to the moving packed bed 2 of two inclinations after dipleg 1, moving packed bed fluidized wind and bed at tilting are expected under the acting in conjunction of gravity, material is transported in the returning charge bed 3 that is connected to separately after each moving packed bed, be transported at the returning charge bed fluidisation wind action material of leaving the bed the refeed line 4 that is connected to thereafter, return to burner hearth by refeed line.
The moving packed bed that tilts by reasonable disposition and returning charge bed the fluidisation air quantity, the returning charge flow can be regulated in wider scope, and then the unstable problem that even can't returning charge of returning charge that supercritical circulating fluidized bed direct current cooker causes due to furnace pressure fluctuation can be effectively overcome.By the double outlet structure design of two horizontal returning charge beds in conjunction with the feed back pipe, realized single-point charging, multiple spot returning charge, effectively improved the problem of the U-shaped valve returning charge inequality of large circulating fluidized bed boiler list outlet.
Claims (2)
1. the two outlet of CFBB feeding back devices, this feeding back device comprises vertical dipleg (1), moving packed bed (2), returning charge bed (3) and refeed line (4), it is characterized in that: described moving packed bed (2), returning charge bed (3) and refeed line (4) are arranged respectively two; Described each moving packed bed (2) is and is in tilted layout, and is 30 °～60 ° angles with vertical direction; Be furnished with moving packed bed bellows (5) bottom moving packed bed, be furnished with returning charge bed bellows (6) bottom the returning charge bed; Two moving packed beds (2), two returning charge beds (3) and two refeed lines (4) form two groups of " shape of falling N " structures.
2. according to the two outlet of a kind of CFBB claimed in claim 1 feeding back devices, it is characterized in that: two groups of " shape of falling N " symmetrical configuration are arranged in vertical dipleg (1) both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220426323 CN202947127U (en) | 2012-08-24 | 2012-08-24 | Double-outlet material return device for circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220426323 CN202947127U (en) | 2012-08-24 | 2012-08-24 | Double-outlet material return device for circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202947127U true CN202947127U (en) | 2013-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220426323 Expired - Lifetime CN202947127U (en) | 2012-08-24 | 2012-08-24 | Double-outlet material return device for circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202947127U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818262A (en) * | 2012-08-24 | 2012-12-12 | 上海锅炉厂有限公司 | Double-outlet material return device of circulating fluidized bed boiler |
| CN105299637A (en) * | 2015-11-15 | 2016-02-03 | 国网山西省电力公司电力科学研究院 | Efficient separation return feeder of circulating fluidized boiler |
-
2012
- 2012-08-24 CN CN 201220426323 patent/CN202947127U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818262A (en) * | 2012-08-24 | 2012-12-12 | 上海锅炉厂有限公司 | Double-outlet material return device of circulating fluidized bed boiler |
| CN102818262B (en) * | 2012-08-24 | 2015-06-17 | 上海锅炉厂有限公司 | Double-outlet material return device of circulating fluidized bed boiler |
| CN105299637A (en) * | 2015-11-15 | 2016-02-03 | 国网山西省电力公司电力科学研究院 | Efficient separation return feeder of circulating fluidized 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: 20130522 Effective date of abandoning: 20150617 |
|
| RGAV | Abandon patent right to avoid regrant |