CN201539858U - Slag cooler of circulating fluidized bed - Google Patents
Slag cooler of circulating fluidized bed Download PDFInfo
- Publication number
- CN201539858U CN201539858U CN2009200775940U CN200920077594U CN201539858U CN 201539858 U CN201539858 U CN 201539858U CN 2009200775940 U CN2009200775940 U CN 2009200775940U CN 200920077594 U CN200920077594 U CN 200920077594U CN 201539858 U CN201539858 U CN 201539858U
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- CN
- China
- Prior art keywords
- slag cooler
- slag
- cavity
- burner hearth
- fluidized bed
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model provides a slag cooler of a circulating fluidized bed. The utility model is characterized in that the slag cooler comprises a slag cooler cavity which is arranged at the lower part of a boiler furnace and consists of a water cooled wall of the slag cooler and part of water cooled wall of the boiler furnace; the water cooled wall of the slag cooler is communicated with the water cooled wall of the boiler furnace; the top of the slag cooler cavity is provided with a return vent pipe; the return vent pipe is connected with the boiler furnace; the upper part of the slag cooler cavity and the part of water cooled wall of the boiler furnace are provided with slag inlets; the middle part of the slag cooler cavity is provided with a S-shaped heat-exchanger pipe; the lower part of the slag cooler cavity is provided with a slag outlet; and the bottom of the slag cooler cavity is sequentially connected with a slag cooler air distribution plate and a fluidizing air chamber. The utility model uses the high-pressure feeding water or boiler water of the boiler to cool the slags, which realizes the heat recovery of the slags, improves the heat efficiency of the boiler and reduces the floor area.
Description
Technical field
The utility model relates to a kind of slag cooler of recirculating fluidized bed, is used for the cooling of slag at the bottom of the CFBB, belongs to CFBB fluidization technique field.
Background technology
The end slag of fluidized-bed combustion boiler discharging be a kind of wide-size distribution (0～30mm), the solid particle of high-temperature (～900 ℃), belong to the material of difficult operation and control, especially big capacity (or big quantity of slag) CFB boiler does not all have good solution both at home and abroad.Therefore, slag cooler belongs to one of the most thorny technological difficulties in the fluidized-bed combustion boiler accessory system.The spent-bed cooler of domestic introduction has caused very big economic loss owing to exist factors such as slagging scorification, boiler slag removal control inefficacy and slag cooler cooling heating surface wear to cause this slag cooler not reach problems such as expection cooling effect to power plant.And some mechanical type slag coolers, as water-cooled auger, water cold drum etc., owing to exist problems such as poorly sealed, that cooling capacity is poor, the repair and maintenance workload is big, application prospect is very unoptimistic at home.
More about the method and apparatus of recirculating fluidized bed bottom slag cooling in the market, the cooling principle of rolling-cylinder type slag-cooler is to be incorporated into slag at the bottom of the fluid bed in the cylinder of rotation by pipeline, arrange in the interlayer of cylinder or the cylindrical shell that heating surface has WATER AS FLOW MEDIUM to cool off, because there is mechanical rotation in this device, make that the pressure of cooling medium water can not be too high, generally require less than 4.0MPa, in addition owing to there are rotatable parts, the sealing of slag inlet also is very difficult to handle, commercial operation shows that slag often appears leaking, leaking in this equipment, and end slag heat can not effectively reclaim.
The slag cooler of wind and water combined recirculating fluidized bed, its design principle is additional slag cooler that is similar to bubbling bed formula outside CFBB, usually form by several chambers that separate by the weir wall, the end slag of fluidized-bed combustion boiler is guided to the empty chamber part of this device by pipeline, by slag at the bottom of coming fluidisation at the slag cooler bottom of recirculating fluidized bed air distribution plate bubbling air medium, realize end slag flowing and conveying between each chamber,, arrange the coil heating surface in the slag cooler according to the cooling needs.Be in operation mobile not smooth between each chamber that shows end slag of the slag cooler of this form found problems such as stifled slag through regular meeting.
Summary of the invention
The purpose of this utility model is to be not easy problems such as replacing at the stifled slag of existing wind and water combined recirculating fluidized bed slag cooler, wearing and tearing, heating surface, proposes a kind of end slag cooler that is suitable for fuel such as the high ash content of fluidized bed combustion, low heat value.
In order to achieve the above object, the technical solution of the utility model provides a kind of slag cooler of recirculating fluidized bed, it is characterized in that, comprise the slag cooler cavity that is arranged on the burner hearth downside tapering part outside, the side that the slag cooler cavity is connected with burner hearth is all or part of to be made of furnace wall cooling;
Wherein, the top of slag cooler cavity is provided with backwind tube, and backwind tube connects burner hearth; The side that the top of slag cooler cavity, above-mentioned slag cooler cavity are connected with burner hearth is provided with slag inlet; The middle part of slag cooler cavity is provided with snakelike heat-exchange tube; The bottom of slag cooler cavity is provided with slag notch; The bottom of slag cooler cavity connects slag cooler air distribution plate and fluidisation air compartment successively.
Further, an end of described snakelike heat-exchange tube is located in the burner hearth, and the other end is located at outside the slag cooler cavity.
Described slag inlet is provided with end slag control valve.
The side that described slag cooler cavity is connected with burner hearth all is made of furnace wall cooling, the slag cooler cavity is made of the slag cooler water-cooling wall with the side that burner hearth is not connected, and the junction of furnace wall cooling and slag cooler water-cooling wall and the both sides up and down of slag cooler water-cooling wall all are provided with high-abrasive material.
Described slag cooler air distribution plate is higher than the side of slag cooler air distribution plate near slag-drip opening away from a side of slag-drip opening, and the angle beta of its inclination is the 0-15 degree.
The cooling medium of described serpentine heat exchanger is boiler feedwater or stove water.
The utility model utilizes the furnace wall cooling surface pipe to form the cavity of slag cooler, arranges heating surface in this cavity, utilizes the high-pressure feed water of boiler or stove water to cool off end slag, realizes the heat recovery of end slag, reduces the floor space of slag cooler.
The utility model has the advantages that:
1. end slag accumulation of heat can directly be reclaimed by boiler, improves boiler thermal output;
2. directly utilize water wall surface to form around the slag cooler, make slag cooler safe and reliable, be convenient to INSULATION DESIGN;
3. slag cooler is arranged in the bottom of water-cooling wall awl section, and arrangement convenience is saved the space.
4. slag cooler is directly with boiler feedwater or stove water cooling, reduces or without other water source, saves power plant water;
5. fine grained and unreacted desulfurizing agent return burner hearth, improve the consumption of boiler combustion efficiency and minimizing desulfurizing agent.
Description of drawings
Fig. 1 is circulating fluidized bed device figure;
The side view that Fig. 2 is connected with burner hearth for the slag cooler cavity.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described.
Embodiment
As shown in Figure 1, be circulating fluidized bed device figure, described recirculating fluidized bed is made up of slag cooler cavity 10, snakelike heat-exchange tube 11, end slag control valve 12, backwind tube 13, slag cooler air compartment 14, slag notch 15, high-abrasive material 16, slag cooler air distribution plate 17, burner hearth 20, air compartment 21, airduct 22, slag inlet 23, furnace wall cooling 25, burner hearth air distribution plate 26, slag cooler water-cooling wall 27, cyclone separator 30 and a material returning device 40.
The slag cooler of recirculating fluidized bed comprises the slag cooler cavity 10 that is arranged on the burner hearth 20 downside tapering parts outside, as shown in Figure 2, the side view that is connected with burner hearth for the slag cooler cavity, the side that slag cooler cavity 10 is connected with burner hearth 20 all is made of furnace wall cooling 25, slag cooler cavity 10 is made of slag cooler water-cooling wall 27 with the side that burner hearth 20 is not connected, and furnace wall cooling 25 all is provided with high-abrasive material 16 with the junction of slag cooler water-cooling wall 27 and the both sides up and down of slag cooler water-cooling wall 27.
The side that the top of slag cooler cavity 10, slag cooler cavity 10 are connected with burner hearth 20 is provided with slag inlet 23, slag inlet 23 is provided with end slag control valve 12, the end slag that burner hearth 20 internal combustion produce enters slag cooler cavity 10 via slag inlet 23, and its inlet is regulated by end slag control valve 12.
The middle part of slag cooler cavity 10 is provided with snakelike heat-exchange tube 11, is used to cool off end slag, and an end of snakelike heat-exchange tube 11 is located in the burner hearth 20, and the other end is located at outside the slag cooler cavity 10, decreases to prevent end sizing; The cooling medium of serpentine heat exchanger 11 is boiler feedwater or stove water.
The bottom of slag cooler cavity 10 connects slag cooler air distribution plate 17 and fluidisation air compartment 14 successively, and the fluidized wind in the fluidisation air compartment 14 enters slag cooler cavity 10 via slag cooler air distribution plate 17, in order to end slag fluidisation, improves end slag cooling effect.
The bottom of slag cooler cavity 10 is provided with slag notch 15, and in order to discharge slag of the cooled end, slag cooler air distribution plate 17 is higher than the side of slag cooler air distribution plate 17 near slag-drip opening 15 away from a side of slag-drip opening 15, and the angle beta of its inclination is 8 degree, helps end slag and discharges.
The top of slag cooler cavity 10 is provided with backwind tube 13, and backwind tube 13 connects burner hearth 20, in order to fine grained and unreacted desulfurizing agent are returned burner hearth.
Claims (6)
1. the slag cooler of a recirculating fluidized bed, it is characterized in that, comprise the slag cooler cavity (10) that is arranged on burner hearth (20) the downside tapering part outside, the side that slag cooler cavity (10) is connected with burner hearth (20) is all or part of to be made of furnace wall cooling (25);
Wherein, the top of slag cooler cavity (10) is provided with backwind tube (13), and backwind tube (13) connects burner hearth (20); The side that the top of slag cooler cavity (10), slag cooler cavity (10) are connected with burner hearth (20) is provided with slag inlet (23); The middle part of slag cooler cavity (10) is provided with snakelike heat-exchange tube (11); The bottom of slag cooler cavity (10) is provided with slag notch (15); The bottom of slag cooler cavity (10) connects slag cooler air distribution plate (17) and fluidisation air compartment (14) successively.
2. the slag cooler of recirculating fluidized bed as claimed in claim 1 is characterized in that, an end of described snakelike heat-exchange tube (11) is located in the burner hearth (20), and the other end is located at outside the slag cooler cavity (10).
3. the slag cooler of recirculating fluidized bed as claimed in claim 1 is characterized in that, described slag inlet (23) is provided with end slag control valve (12).
4. the slag cooler of recirculating fluidized bed as claimed in claim 1, it is characterized in that, the side that described slag cooler cavity (10) is connected with burner hearth (20) all is made of furnace wall cooling (25), slag cooler cavity (10) is made of the slag cooler water-cooling wall with the side that burner hearth (20) is not connected, and furnace wall cooling (25) all is provided with high-abrasive material (16) with the junction of slag cooler water-cooling wall (27) and the both sides up and down of slag cooler water-cooling wall (27).
5. the slag cooler of recirculating fluidized bed as claimed in claim 1 is characterized in that, described slag cooler air distribution plate (17) is higher than the side of slag cooler air distribution plate (17) near slag-drip opening (15) away from a side of slag-drip opening (15), and the angle beta of its inclination is the 0-15 degree.
6. the slag cooler of recirculating fluidized bed as claimed in claim 1 is characterized in that, the cooling medium of described serpentine heat exchanger (11) is boiler feedwater or stove water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200775940U CN201539858U (en) | 2009-06-30 | 2009-06-30 | Slag cooler of circulating fluidized bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200775940U CN201539858U (en) | 2009-06-30 | 2009-06-30 | Slag cooler of circulating fluidized bed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201539858U true CN201539858U (en) | 2010-08-04 |
Family
ID=42591311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200775940U Expired - Lifetime CN201539858U (en) | 2009-06-30 | 2009-06-30 | Slag cooler of circulating fluidized bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201539858U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102927565A (en) * | 2012-11-28 | 2013-02-13 | 瓮福（集团）有限责任公司 | Ash discharge cooling device of circulating fluidized bed boiler |
-
2009
- 2009-06-30 CN CN2009200775940U patent/CN201539858U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102927565A (en) * | 2012-11-28 | 2013-02-13 | 瓮福（集团）有限责任公司 | Ash discharge cooling device of circulating fluidized bed boiler |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100804 |