CN207527575U - The material-returning device of CFB boiler - Google Patents
The material-returning device of CFB boiler Download PDFInfo
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- CN207527575U CN207527575U CN201721569856.6U CN201721569856U CN207527575U CN 207527575 U CN207527575 U CN 207527575U CN 201721569856 U CN201721569856 U CN 201721569856U CN 207527575 U CN207527575 U CN 207527575U
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- blast cap
- wind
- return box
- independent
- cfb boiler
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Abstract
The utility model is related to CFB boiler apparatus fields, specially a kind of material-returning device of CFB boiler, the concentration of circulating ash during it can be reduced into burner hearth, improve ignition temperature and denitration efficiency, it includes return box, the return box upper end connects separator standpipe, lower end connects return box air compartment, the return box includes loosening region and fluidisation area, the fluidisation area is provided with fluidized wind blast cap and conveying wind blast cap, the loosening region, which is provided with, loosens wind blast cap, the fluidisation area is additionally provided with independent blast cap, the blast cap head percent opening of the independent blast cap is more than the blast cap head percent opening for loosening wind blast cap, the independent blast cap bottom connection returning charge air hose.
Description
Technical field
The utility model is related to CFB boiler apparatus field, specially a kind of material-returning device of CFB boiler.
Background technology
The circulation loop of circulating fluidized bed boiler is made of burner hearth, high temperature cyclone separator, material-returning device.With high temperature
The continuous improvement of cyclone separator research level, the separative efficiency of the high temperature cyclone separator in CFB boiler have been increased to 99.6%
Left and right, in addition Secondary Air is arranged, cloth wind is arranged, the optimizations such as returning charge arrangement so that NOx, SO2 original discharge concentration of boiler are significantly
It reduces；The station service of CFB complete auxiliaries also declines therewith.The raising of the separative efficiency of high temperature cyclone separator is also brought new
Problem：When boiler at low load is run, the separative efficiency of separator reduces few with the reduction of load, causes ignition temperature
Relatively low, clinker, the raising of flying dust incendivity object, flue gas temperature of hearth outlet are less than " SNCR " denitration temperature window, spray ammonium hydroxide denitration
Efficiency reduces.
Invention content
To solve the above-mentioned problems, the utility model provides a kind of material-returning device of CFB boiler, can reduce entrance
The concentration of circulating ash in burner hearth improves ignition temperature and denitration efficiency.
Its technical solution is such:A kind of material-returning device of CFB boiler, including return box, the return box upper end
Separator standpipe, lower end connection return box air compartment are connected, the return box includes loosening region and fluidisation area, the fluidization regions
Domain is provided with fluidized wind blast cap and conveying wind blast cap, and the loosening region, which is provided with, loosens wind blast cap, which is characterized in that the stream
Change region and be additionally provided with independent blast cap, the blast cap head percent opening of the independent blast cap is more than the blast cap head for loosening wind blast cap and opens
Porosity, the independent blast cap bottom connection returning charge air hose.
It is further characterized by the centers of separator standpipe described in the independent blast cap face；
Flow control valve is provided on the returning charge air hose；
The fluidized wind blast cap, conveying wind blast cap, loosening wind blast cap bottom are all connected with air hose, and tune is equipped on the air hose
Save valve.
After the device of the utility model, when boiler at low load operation or high ash powder coal is burnt, when ignition temperature is too low,
Open the returning charge wind of independent blast cap, from independent blast cap come out Wind Volume can break through in separator standpipe material envelope, draw into
On air-flow, normal centrifugal force air-flow inside this strand of airflow influence cyclone separator, so as to reducing separator separation effect
Rate；Simultaneously this strand big returning charge air quantity can also by the upward blowback of a part of circulating ash in return box to Membrane Separator Cylinder for CFB Boiler top then
Boiler back end ductwork is taken to by flue gas；The reduction of separator, the reduction of circulating ash quantity, two factor superpositions are reduced
The circulating ash quantity of burner hearth is returned to, so as to improving ignition temperature and denitration efficiency.
Description of the drawings
FIG. 1 is a schematic structural view of the utility model；
Fig. 2 is return box structure diagram；
Fig. 3 is Fig. 2 elevational schematic views.
Specific embodiment
See Fig. 1, Fig. 2, shown in Fig. 3, a kind of material-returning device of CFB boiler, including return box 1, the connection of 1 upper end of return box
Separator standpipe 2, lower end connection return box air compartment 3, return box 1 includes loosening region 1-1 and fluidisation area 1-2, fluidisation area
1-2 is provided with fluidized wind blast cap 4 and conveying wind blast cap 5, loosens region 1-1 and is provided with loosening wind blast cap 6, fluidisation area 1-2 is also
Independent blast cap 7 is provided with, the blast cap head percent opening of independent blast cap 7 is more than the blast cap head percent opening for loosening wind blast cap 6, independent blast cap
7 bottoms connection returning charge air hose 8, the center of independent 7 face separator standpipe 2 of blast cap can be preferably influenced in cyclone separator
The normal centrifugal force air-flow in portion, so as to reduce separator；Flow control valve 9, flow are provided on returning charge air hose 8
The control of regulating valve 9 enters the returning charge air quantity of independent blast cap 7, and the returning charge air quantity given is bigger, to separator centrifugal force airflow influence just
Bigger, the circulating ash quantity of upward blowback is also bigger, returns to the circulating ash quantity of burner hearth with regard to smaller, ignition temperature is higher, therefore can
To enter the returning charge air volume of independent blast cap 7 by adjusting, to control the size returned to burner hearth circulating ash quantity, and then control
Ignition temperature.
Fluidized wind blast cap 4, conveying wind blast cap 5,6 bottom of loosening wind blast cap are all connected with air hose 10, and tune is equipped on air hose 10
Save valve 11.
Claims (4)
1. a kind of material-returning device of CFB boiler, including return box, the return box upper end connection separator standpipe, lower end connect
Connect return box air compartment, the return box includes loosening region and fluidisation area, the fluidisation area be provided with fluidized wind blast cap and
Wind blast cap is conveyed, the loosening region, which is provided with, loosens wind blast cap, which is characterized in that the fluidisation area is additionally provided with independent wind
Cap, the blast cap head percent opening of the independent blast cap are more than the blast cap head percent opening for loosening wind blast cap, the independent blast cap bottom
Portion connects returning charge air hose.
A kind of 2. material-returning device of CFB boiler according to claim 1, which is characterized in that the independent blast cap face institute
State the center of separator standpipe.
3. the material-returning device of a kind of CFB boiler according to claim 1, which is characterized in that set on the returning charge air hose
There is flow control valve.
4. the material-returning device of a kind of CFB boiler according to claim 1, which is characterized in that the fluidized wind blast cap, conveying
Wind blast cap, loosening wind blast cap bottom are all connected with air hose, and regulating valve is equipped on the air hose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721569856.6U CN207527575U (en) | 2017-11-22 | 2017-11-22 | The material-returning device of CFB boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721569856.6U CN207527575U (en) | 2017-11-22 | 2017-11-22 | The material-returning device of CFB boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207527575U true CN207527575U (en) | 2018-06-22 |
Family
ID=62579332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721569856.6U Active CN207527575U (en) | 2017-11-22 | 2017-11-22 | The material-returning device of CFB boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207527575U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741011A (en) * | 2017-11-22 | 2018-02-27 | 无锡华光锅炉股份有限公司 | A kind of material-returning device of CFB boiler |
| CN113265272A (en) * | 2021-05-11 | 2021-08-17 | 新奥科技发展有限公司 | Return riser structure, coal gasification system and method for returning materials |
-
2017
- 2017-11-22 CN CN201721569856.6U patent/CN207527575U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741011A (en) * | 2017-11-22 | 2018-02-27 | 无锡华光锅炉股份有限公司 | A kind of material-returning device of CFB boiler |
| CN107741011B (en) * | 2017-11-22 | 2023-05-05 | 无锡华光环保能源集团股份有限公司 | Material returning device of CFB boiler |
| CN113265272A (en) * | 2021-05-11 | 2021-08-17 | 新奥科技发展有限公司 | Return riser structure, coal gasification system and method for returning materials |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 214028 No. 3 Chengnan Road, new Wu District, Jiangsu, Wuxi Patentee after: Wuxi Huaguang Environmental Protection Energy Group Co., Ltd Address before: 214028 No. 3 Chengnan Road, new Wu District, Jiangsu, Wuxi Patentee before: WUXI HUAGUANG BOILER Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |