CN202253616U - Two-stage scraper type slag air-water joint cooling and conveying machine for fluidized bed boiler - Google Patents
Two-stage scraper type slag air-water joint cooling and conveying machine for fluidized bed boiler Download PDFInfo
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- CN202253616U CN202253616U CN2011203263693U CN201120326369U CN202253616U CN 202253616 U CN202253616 U CN 202253616U CN 2011203263693 U CN2011203263693 U CN 2011203263693U CN 201120326369 U CN201120326369 U CN 201120326369U CN 202253616 U CN202253616 U CN 202253616U
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Abstract
The utility model discloses a two-stage scraper type slag air-water joint cooling and conveying machine for a fluidized bed boiler. The machine comprises a primary slag cooler of which an inlet is communicated with an outlet of a slag discharging tube of the circulating fluidized bed boiler. A primary slag cooler scraper is arranged on a middle lower part in the primary slag cooler. The slag cooling and conveying machine further comprises a secondary slag cooler of which an inlet is communicated with an outlet of the primary slag cooler. A secondary slag cooler scraper is arranged on a middle lower part in the secondary slag cooler. A cooling water heating surface is formed below the secondary slag cooler. A slag discharging tube of the secondary slag cooler is arranged below the rear part of the secondary slag cooler. Bottom slag enters the primary slag air-water joint cooler, and is cooled and conveyed by the primary slag cooler scraper at the same time; heat-exchanged hot water returns to the hearth through a return duct; and the primarily cooled bottom slag enters the secondary slag cooler, and is further cooled by a cooling water jacket and then conveyed to subsequent slag conveying equipment. The slag cooling and conveying machine is good in slag cooling effect, free from the limitation of a particle size of the bottom slag, simpler and more reliable, and integrates slag cooling and conveying.
Description
Technical field
Slag cooled off the conveying technology field at the bottom of the utility model related to CFBB, was specifically related to a kind of fluidized-bed combustion boiler with the cold slag slag conveyer of the wind and water combined cooling scraper-type of two-stage.
Background technology
The emission control of end slag is the outstanding problem that perplexs CFBB power plant at present with cooling, directly has influence on the safe and stable operation of whole unit.Because exist slagging scorification, wearing and tearing, deslagging control to lose efficacy, do not reach the expection cooling effect and the problem such as little of exerting oneself, the slag cooler fault has caused very big economic loss to power plant.At present, the CFBB slag cooler that range of application is wider mainly contains two kinds of water cold drum formula and wind and water combined fluidized bed formulas.
Though water cold drum formula slag cooler have control simple relatively, to advantages such as granularity adaptability are strong; But have drawback: 1) heat transfer coefficient relatively low, 2) the frame for movement fault is more relatively, 3) as far as 300MW grade recycle fluidized-bed combustion boiler; When adopting condensate as cooling medium; Its pressure is higher to be 3.0-3.5MPa; Double-layer seal sleeve and Inlet and outlet water swivel joint are had higher requirement the problem, 4 that causes swivel joint to be prone to leaking) whole recovery of heat are had difficulties.
Wind and water combined cooling bed formula slag cooler has effectively utilized the ripe two phase flow technology of fluidized-bed combustion boiler, and heat transfer efficiency is high, and its principle is: cold air is transported to the air compartment of slag cooler through high pressure positive blower; Pass air distribution plate then equably; Contact with the slag on the air distribution plate, under fluidised state, cold air and slag carry out heat exchange; Cold air is heated, and slag is cooled.In addition, arrange wall-cooling surface in the slag cooler, can more effectively absorb heat of slags, reduce the slag temperature, improve boiler efficiency.This slag cooler adopts fluid bed principle and corresponding construction, and the heat transfer coefficient between slag particle and the heating surface is high, and slag cooler is exerted oneself greatly; Through empty G&W two media the heat of lime-ash is recycled, improved boiler efficiency.But this slag cooler exists slag input control difficulty, granularity bad adaptability, complicated, the more high relatively shortcoming of fault rate of operation control, is difficult to satisfy the needs of boiler unit reliability service.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists; The purpose of the utility model is to provide a kind of fluidized-bed combustion boiler with the cold slag slag conveyer of the wind and water combined cooling scraper-type of two-stage; This cold slag slag conveyer has that cold slag is effective, the restriction that does not receive end slag particle degree, the defeated slag of cold slag are integrated; In the cooling of end slag, accomplish and carry, system is more simple and reliable.
In order to achieve the above object, the utility model adopts following technical scheme:
A kind of fluidized-bed combustion boiler is with the cold slag slag conveyer of the wind and water combined cooling scraper-type of two-stage; Comprise elementary slag cooler 7; The import of said elementary slag cooler 7 is connected with the outlet of CFBB scum pipe 1, and the middle and lower part in the said elementary slag cooler 7 is provided with elementary slag cooler scraper plate 20, and said cold slag slag conveyer also comprises secondary slag cooler 11; The import of said secondary slag cooler 11 is connected with the outlet of elementary slag cooler 7; Middle and lower part in the said secondary slag cooler 11 is provided with secondary slag cooler scraper plate 21, and the below of said secondary slag cooler 11 is provided with the cooling water heating surface, and the lower rear of said secondary slag cooler 11 is provided with secondary slag cooler scum pipe 13.
Said elementary slag cooler 7 front upper are provided with import; Lower rear is provided with outlet; The postmedian top is provided with backwind tube 6; The below is provided with air-distribution device 16 and the cooling air compartment 17 that is positioned at air-distribution device 16 belows, and elementary slag cooler 7 bottoms, sidepiece or bottom and sidepiece are provided with the cooling water heating surface.
Said secondary slag cooler 11 front upper are provided with import, and the top, rear portion is provided with negative pressure pipe 12.
Passage 4 and sealing device 5 are set under the import of said elementary slag cooler 7.
Said sealing device 5 is a sealing plate.
The cooling water heating surface that the cooling water heating surface of said elementary slag cooler 7 bottoms, sidepiece or bottom and sidepiece setting and secondary slag cooler 11 bottoms are provided with is a cooling jacket.
Said backwind tube 6 adopts light pipe or inside to apply the abrasionproof liner, and manual push-pull valve is set.
The outlet of said elementary slag cooler 7 is provided with elementary slag cooler scum pipe 9, and elementary slag cooler scum pipe 9 is connected with the import of secondary slag cooler 11 front upper.
Said air-distribution device 16 is porous plate or blast cap.
Said negative pressure pipe 12 adopts light pipe, and manual push-pull valve is set.
Compared with prior art, the utlity model has following advantage:
1, elementary slag cooler adopts wind and water combined cooling principle and corresponding construction, and cooling air and cooling water and end slag heat exchange are strong, good cooling results, and cooling capacity is strong;
2, adopt the two-stage slag cooler, cooling effect is better;
3, through empty G&W two media the heat of lime-ash is recycled, cooling air returns burner hearth after heating, participates in burning, and cooling water adopts condensate, and the heat of end slag is fully recycled, and improves the unit economic benefit;
4, adopt scraper plate to carry out the conveying of end slag, guarantee that this slag cooler does not receive the restriction of end slag particle degree;
5, the defeated slag of cold slag is integrated, in the cooling of end slag, accomplishes and carries, and conventional at present configuration is equivalent to reduce the slag cooler system, and system is more simple and reliable.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 be the utility model Fig. 1 along A-A to cutaway view
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the utility model is done more detailed explanation.
Like Fig. 1, shown in Figure 2; A kind of fluidized-bed combustion boiler of the utility model is with the cold slag slag conveyer of the wind and water combined cooling scraper-type of two-stage; Comprise that upper front end has the elementary slag cooler 7 that import and rear end lower have outlet; The CFBB discharge temperature is about 900 ℃ end slag via getting into elementary slag cooler 7 imports after CFBB scum pipe 1, compensator 2 and the comb formula combination valve 3, and passage 4 and sealing plate 5 are set under the import of elementary slag cooler 7, realizes the sealing of high-temperature flue gas in the burner hearth; Avoid big calorimetric flue gas to get into elementary slag cooler 7; Elementary slag cooler 7 bottoms are provided with air distribution plate 16 and the cooling air compartment 17 that is positioned at air distribution plate 16 belows, through high pressure positive blower cold air are transported to the air compartment 17 of slag cooler through the female pipe 15 of cooling air through blast pipe 8, then cold air equably the form of passing be the air distribution plate 16 of porous plate; Contact with the slag on the air distribution plate 16; Elementary slag cooler 7 bottoms, sidepiece or bottom and sidepiece are provided with cooling jacket, through elementary slag cooler cooling water inlet pipe 10 condensed water are fed cooling jacket, and elementary slag cooler 7 adopts the mode of wind and water combined cooling to carry out the cooling of end slag; In the cooling of end slag; Scraper plate 20 through the middle and lower part in the elementary slag cooler 7 is provided with is accomplished its conveying, and the hot blast after the heat exchange returns boiler hearth of circulating fluidized bed through the light pipe backwind tube 6 that manual push-pull valve is set, and the cooling water of cooling back end slag is discharged and recycled via elementary slag cooler CWR 14;
After tentatively the end slags of cooling are reduced to 300～450 ℃ by elementary slag cooler 7; Get into secondary slag cooler 11 through elementary slag cooler scum pipe 9; Secondary slag cooler 11 bottoms are provided with cooling jacket; Through secondary slag cooler cooling water inlet pipe 19 condensed water is fed the further cooling that cooling jacket is accomplished end slag; The scraper plate 21 that is provided with through the middle and lower parts in the secondary slag cooler 11 will cool off the end slag that back temperature is not higher than 150 ℃ and send into follow-up slag-conveying device through secondary slag cooler scum pipe 13; The tail end top of secondary slag cooler 11 is provided with the light pipe negative pressure pipe 12 of manual push-pull valve, gets into follow-up slag-conveying device to avoid flue gas, and the cooling water of cooling back end slag is discharged and recycled via secondary slag cooler CWR 18.
A kind of fluidized-bed combustion boiler of the utility model uses the cold slag slag conveyer of the wind and water combined cooling scraper-type of two-stage operation principle to be: the CFBB discharge temperature be about 900 ℃ end slag via CFBB scum pipe 1, compensator 2 and comb formula combination valve 3 after; Get into elementary slag cooler 7; Elementary slag cooler 7 adopts the mode of wind and water combined cooling to carry out the cooling of end slag; In the cooling of end slag, to accomplish it through the scraper plate 20 of elementary slag cooler 7 and carry, the hot blast after the heat exchange returns burner hearth via backwind tube 6; End slag temperature after elementary slag cooler 7 coolings is about 400 ℃; The end slag of preliminary cooling gets into secondary slag cooler 11 through elementary slag cooler scum pipe 9, by the further cooling of cooling jacket to end slag, in the cooling of end slag; Scraper plate 21 through secondary slag cooler 11 is accomplished it and is carried, and guarantees that temperature is not higher than 150 ℃ end slag and sends into follow-up slag-conveying device by scum pipe 13.
Claims (10)
1. a fluidized-bed combustion boiler is with the cold slag slag conveyer of the wind and water combined cooling scraper-type of two-stage; Comprise elementary slag cooler (7); The import of said elementary slag cooler (7) is connected with the outlet of CFBB scum pipe (1); It is characterized in that: the middle and lower part in the said elementary slag cooler (7) is provided with elementary slag cooler scraper plate (20); Said cold slag slag conveyer also comprises secondary slag cooler (11), and the import of said secondary slag cooler (11) is connected with the outlet of elementary slag cooler (7), and the middle and lower part in the said secondary slag cooler (11) is provided with secondary slag cooler scraper plate (21); The below of said secondary slag cooler (11) is provided with the cooling water heating surface, and the lower rear of said secondary slag cooler (11) is provided with secondary slag cooler scum pipe (13).
2. cold slag slag conveyer according to claim 1; It is characterized in that: said elementary slag cooler (7) front upper is provided with import; Lower rear is provided with outlet; The postmedian top is provided with backwind tube (6), and the below is provided with air-distribution device (16) and is positioned at the cooling air compartment (17) of air-distribution device (16) below, and elementary slag cooler (7) bottom, sidepiece or bottom and sidepiece are provided with the cooling water heating surface.
3. cold slag slag conveyer according to claim 1 is characterized in that: said secondary slag cooler (11) front upper is provided with import, and the top, rear portion is provided with negative pressure pipe (12).
4. cold slag slag conveyer according to claim 2 is characterized in that: passage (4) and sealing device (5) are set under the import of said elementary slag cooler (7).
5. cold slag slag conveyer according to claim 4 is characterized in that: said sealing device (5) is a sealing plate.
6. according to claim 2 or 3 described cold slag slag conveyers, it is characterized in that: the cooling water heating surface that cooling water heating surface that said elementary slag cooler (7) bottom, sidepiece or bottom and sidepiece are provided with and secondary slag cooler (11) bottom are provided with is a cooling jacket.
7. cold slag slag conveyer according to claim 2 is characterized in that: said backwind tube (6) adopts light pipe or inside to apply the abrasionproof liner, and manual push-pull valve is set.
8. according to claim 2 or 3 described cold slag slag conveyers, it is characterized in that: the outlet of said elementary slag cooler (7) is provided with elementary slag cooler scum pipe (9), and elementary slag cooler scum pipe (9) is connected with the import of secondary slag cooler (11) front upper.
9. cold slag slag conveyer according to claim 2 is characterized in that: said air-distribution device (16) is porous plate or blast cap.
10. cold slag slag conveyer according to claim 3 is characterized in that: said negative pressure pipe (12) adopts light pipe, and manual push-pull valve is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203263693U CN202253616U (en) | 2011-09-01 | 2011-09-01 | Two-stage scraper type slag air-water joint cooling and conveying machine for fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203263693U CN202253616U (en) | 2011-09-01 | 2011-09-01 | Two-stage scraper type slag air-water joint cooling and conveying machine for fluidized bed boiler |
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| Publication Number | Publication Date |
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| CN202253616U true CN202253616U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203263693U Expired - Lifetime CN202253616U (en) | 2011-09-01 | 2011-09-01 | Two-stage scraper type slag air-water joint cooling and conveying machine for fluidized bed boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107642776A (en) * | 2017-10-30 | 2018-01-30 | 贵州新能源开发投资股份有限公司 | A kind of slag storehouse formula slag cooler and its application method suitable for low heat value spoil |
| CN112696666A (en) * | 2019-10-23 | 2021-04-23 | 北京中电长峰节能科技有限公司 | Hot slag energy and fine particle recovery system of circulating fluidized bed boiler |
-
2011
- 2011-09-01 CN CN2011203263693U patent/CN202253616U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107642776A (en) * | 2017-10-30 | 2018-01-30 | 贵州新能源开发投资股份有限公司 | A kind of slag storehouse formula slag cooler and its application method suitable for low heat value spoil |
| CN112696666A (en) * | 2019-10-23 | 2021-04-23 | 北京中电长峰节能科技有限公司 | Hot slag energy and fine particle recovery system of circulating fluidized bed boiler |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120530 |