CN201944830U - Tapering secondary air duct for fluidized bed boiler hearth - Google Patents
Tapering secondary air duct for fluidized bed boiler hearth Download PDFInfo
- Publication number
- CN201944830U CN201944830U CN2011200428196U CN201120042819U CN201944830U CN 201944830 U CN201944830 U CN 201944830U CN 2011200428196 U CN2011200428196 U CN 2011200428196U CN 201120042819 U CN201120042819 U CN 201120042819U CN 201944830 U CN201944830 U CN 201944830U
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- secondary air
- air inlet
- duct
- bed boiler
- tapering
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Abstract
The utility model discloses a tapering secondary air duct for a fluidized bed boiler hearth, which comprises a secondary air inlet duct connected between a secondary big bellow and an air inlet port of a boiler body. The pipe diameter of the secondary air inlet duct tapers from the secondary big bellow towards the air inlet port of the boiler body. The cross section of the secondary air inlet duct is rectangular, the end portion of the secondary air inlet duct is provided with a nozzle, and the nozzle extends from the air inlet port into the inner cavity of the boiler body. The pipe diameter of the spout portion of the nozzle is adjustable. The tapering secondary air duct for the fluidized bed boiler hearth has the advantages that the pipe diameter of the air inlet duct tapers gradually, resistance force of the secondary air duct is greatly reduced, penetrability of a secondary air jet flow is improved, and oxygen supply to the hearth core area is increased. Furthermore, the tapering secondary air duct for the fluidized bed boiler hearth is simple in structure; during use, big ports of dozens of the secondary air inlet ducts are connected with the secondary big bellow, and local resistance force on the connection portion is greatly reduced; and simultaneously the secondary air inlet duct with a tapering pipe diameter greatly reduces on-way resistance of the air duct, and a fan is enabled to save electricity by above 25%.
Description
Technical field
The utility model relates to the boiler blast pipe, especially relates to a kind of convergent secondary air channel that is used for fluid bed boiler furnace.
Background technology
China uses the maximum country of CFBB (CFB boiler) in power plant at present, and the big or small fluid bed station boiler that has moved reaches more than 2000.For improving coal-fired after-flame degree, CFBB furnace wall before lower furnace portion centrum water-cooling wall in power station has been arranged tens secondary air channels with the back furnace wall, is used for providing oxygen to the burner hearth core space.Because the granule density of boiler hearth of circulating fluidized bed bottom is bigger, penetrability to secondary wind jet is had relatively high expectations, simultaneously water screen tube row surface is being washed away as the adherent grey stream of waterfall in the be in operation water screen tube row surface of being close to of the big flow that produces from top to bottom of boiler, stop secondary wind jet, also can weaken the penetrability of secondary wind jet.Existing secondary air channel connects from the big bellows of secondary, interface at airduct and bellows can produce bigger local resistance, isometrical design of each airduct simultaneously and diameter are less, also there is elbow, make that the resistance of ducting of secondary air channel is very big, cause the overfire air fan outlet pressure very big, the blower fan power consumption is high, and power consumption is far longer than the generating plant pulverized coal boiler blower fan.
Summary of the invention
The purpose of this utility model is to provide a kind of convergent secondary air channel that is used for fluid bed boiler furnace, and this airduct can reduce the secondary air channel resistance, makes the blower fan economize on electricity more than 25% under the required prerequisite satisfied production.
For achieving the above object, the utility model can be taked following technical proposals:
The convergent secondary air channel that is used for fluid bed boiler furnace described in the utility model comprises the secondary wind inleting tube that is connected between big bellows of secondary and the body of heater air inlet, and the caliber of described secondary wind inleting tube dwindles to body of heater air inlet direction gradually from the big bellows of secondary.
The cross section of described secondary wind inleting tube is a rectangle.
The end of described secondary wind inleting tube is provided with nozzle, and described nozzle extends in the body of heater inner chamber from the body of heater air inlet.
The caliber size at described nozzle spout place can be adjusted.
Advantage of the present utility model is that the arrogant bellows of the caliber of secondary wind inleting tube dwindle gradually to body of heater air inlet direction, greatly reduces the secondary air channel resistance, has improved the penetrability of secondary wind jet, has increased the oxygen-supplying amount of burner hearth core space.The utility model is simple in structure, during actual the use, big mouthful of tens secondary wind inleting tubes is connected on the big bellows of secondary, has reduced the local resistance of interface greatly, the secondary wind inleting tube of caliber convergent greatly reduces the on-way resistance of airduct again simultaneously, makes the blower fan economize on electricity more than 25%.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the A portion enlarged drawing of Fig. 1.
The specific embodiment
As Fig. 1, shown in 2, the convergent secondary air channel that is used for fluid bed boiler furnace described in the utility model, comprise the secondary wind inleting tube 3 that is connected between big bellows 1 of secondary and body of heater 2 air inlets, the cross section of described secondary wind inleting tube 3 is a rectangle, its caliber dwindles to body of heater 2 air inlet directions gradually from the big bellows 1 of secondary, not only reduced the local resistance of interface, also greatly reduce the airduct on-way resistance, the penetrability of secondary wind jet is provided, increased the oxygen-supplying amount of burner hearth core space, strengthen the after-flame degree of coal particles, reduced the phosphorus content in the boiler fly ash, reduced the waste of the energy; The end of secondary wind inleting tube 3 is provided with nozzle 4, nozzle 4 extends in body of heater 2 inner chambers from body of heater 2 air inlets, the nozzle 4 of elongation can change direction with the adherent ash stream on body of heater air inlet top, make adherent ash stream no longer wash away secondary wind jet, improve the penetrability of secondary wind jet relatively, increased the oxygen-supplying amount of burner hearth core space; The caliber size at described nozzle 4 spout places can be adjusted (as adjusting the caliber at nozzle spout place with being hinged on adjustment plate 5 on the nozzle), thereby the wind speed air quantity can be adjusted to optimal operational condition.
Claims (4)
1. convergent secondary air channel that is used for fluid bed boiler furnace, comprise the secondary wind inleting tube (3) that is connected between big bellows of secondary (1) and body of heater (2) air inlet, it is characterized in that: the caliber of described secondary wind inleting tube (3) dwindles to body of heater (2) air inlet direction gradually from the big bellows of secondary (1).
2. the convergent secondary air channel that is used for fluid bed boiler furnace according to claim 1 is characterized in that: the cross section of described secondary wind inleting tube (3) is a rectangle.
3. the convergent secondary air channel that is used for fluid bed boiler furnace according to claim 1 and 2, it is characterized in that: the end of described secondary wind inleting tube (3) is provided with nozzle (4), and described nozzle (4) extends in body of heater (2) inner chamber from body of heater (2) air inlet.
4. the convergent secondary air channel that is used for fluid bed boiler furnace according to claim 3 is characterized in that: the caliber size at described nozzle (4) spout place can be adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200428196U CN201944830U (en) | 2011-02-21 | 2011-02-21 | Tapering secondary air duct for fluidized bed boiler hearth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200428196U CN201944830U (en) | 2011-02-21 | 2011-02-21 | Tapering secondary air duct for fluidized bed boiler hearth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201944830U true CN201944830U (en) | 2011-08-24 |
Family
ID=44472172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200428196U Expired - Fee Related CN201944830U (en) | 2011-02-21 | 2011-02-21 | Tapering secondary air duct for fluidized bed boiler hearth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201944830U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566348A (en) * | 2014-11-27 | 2015-04-29 | 江苏太湖锅炉股份有限公司 | Secondary air blast device of biomass fuel boiler |
-
2011
- 2011-02-21 CN CN2011200428196U patent/CN201944830U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566348A (en) * | 2014-11-27 | 2015-04-29 | 江苏太湖锅炉股份有限公司 | Secondary air blast device of biomass fuel boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20130221 |