CN102287814A - Two-stage wind-water joint cooling scraper-type cold slag conveyer - Google Patents
Two-stage wind-water joint cooling scraper-type cold slag conveyer Download PDFInfo
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- CN102287814A CN102287814A CN2011102571564A CN201110257156A CN102287814A CN 102287814 A CN102287814 A CN 102287814A CN 2011102571564 A CN2011102571564 A CN 2011102571564A CN 201110257156 A CN201110257156 A CN 201110257156A CN 102287814 A CN102287814 A CN 102287814A
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Abstract
The invention relates to a two-stage wind-water joint cooling scraper-type cold slag conveyer which comprises a primary slag cooler; an inlet of the primary slag cooler is communicated with an outlet of a circulating fluidized bed boiler slag discharge pipe; a primary slag cooler scraper is arranged at the middle lower part in the primary slag cooler; the cold slag conveyer also comprises a secondary slag cooler; the inlet of the secondary slag cooler is communicated with the outlet of the primary slag cooler; a secondary slag cooler scraper is arranged at the middle lower part in the secondary slag cooler, a cooling water heating surface is arranged below the secondary slag cooler, and a secondary slag cooler discharge pipe is arranged below the rear part of the secondary slag cooler; bottom flag enters a wind-water joint cooling primary slag cooler; when being cooled, the bottom slag is conveyed by the primary slag cooler scraper; hot air after heat exchange returns to a hearth through an air return pipe; the primarily cooled bottom slag enters the secondary slag cooler; a cooling water jacket further cools the bottom slag and sends the bottom slag to follow-up slag conveying equipment; and the cold slag conveyer has a good slag cooling effect, is not restricted by the grain size of the bottom slag, integrates slag cooling and slag conveying, so that the system is simpler and more reliable.
Description
Technical field
Slag cools off the conveying technology field at the bottom of the present invention relates to CFBB, is specifically related to the cold slag slag conveyer of the wind and water combined cooling scraper-type of a kind of two-stage.
Background technology
The emission control of end slag and cooling are the outstanding problems that perplexs CFBB power plant at present, directly have 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 following shortcoming: 1) heat transfer coefficient relatively low, 2) the frame for movement fault is more relatively, 3) for 300MW grade recycle fluidized-bed combustion boiler, when adopting condensate water 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 two phase flow technology of fluidized-bed combustion boiler maturation, the heat transfer efficiency height, its principle is: cold air is transported to the air compartment of slag cooler by 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 height between slag particle and the heating surface, slag cooler are exerted oneself greatly; By 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 object of the present invention is to provide the cold slag slag conveyer of the wind and water combined cooling scraper-type of a kind of two-stage, this cold slag slag conveyer has that cold slag is effective, the restriction that is not subjected to end slag particle degree, the defeated slag of cold slag are integrated, finish conveying in the cooling of end slag, system is more simple and reliable.
In order to achieve the above object, the present invention is by the following technical solutions:
The cold slag slag conveyer of the wind and water combined cooling scraper-type of a kind of two-stage, comprise elementary slag cooler 7, the import of described elementary slag cooler 7 is connected with the outlet of CFBB scum pipe 1, middle and lower part in the described elementary slag cooler 7 is provided with elementary slag cooler scraper plate 20, described cold slag slag conveyer also comprises secondary slag cooler 11, the import of described secondary slag cooler 11 is connected with the outlet of elementary slag cooler 7, middle and lower part in the described secondary slag cooler 11 is provided with secondary slag cooler scraper plate 21, the below of described secondary slag cooler 11 is provided with the cooling water heating surface, and the lower rear of described secondary slag cooler 11 is provided with secondary slag cooler scum pipe 13.
Described 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 is positioned at the cooling air compartment 17 of air-distribution device 16 belows, and elementary slag cooler 7 bottoms, sidepiece or bottom and sidepiece are provided with the cooling water heating surface.
Described 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 described elementary slag cooler 7.
Described sealing device 5 is a sealing plate.
The cooling water heating surface that the cooling water heating surface of described elementary slag cooler 7 bottoms, sidepiece or bottom and sidepiece setting and secondary slag cooler 11 bottoms are provided with is a cooling jacket.
Described backwind tube 6 adopts light pipe or inside to apply the abrasionproof liner, and manual push-pull valve is set.
The outlet of described 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.
Described air-distribution device 16 is porous plate or blast cap.
Described negative pressure pipe 12 adopts light pipe, and manual push-pull valve is set.
Compared with prior art, the present invention has the following advantages:
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, by 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 water, 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 is not subjected to the restriction of end slag particle degree;
5, the defeated slag of cold slag is integrated, finishes conveying in the cooling of end slag, 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 a structural representation of the present invention.
Fig. 2 for Fig. 1 of the present invention along A-A to cutaway view
The specific embodiment
The present invention will be described in more detail below in conjunction with the drawings and specific embodiments.
As Fig. 1, shown in Figure 2, the cold slag slag conveyer of the wind and water combined cooling scraper-type of a kind of two-stage of the present invention, 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 CFBB scum pipe 1, enter elementary slag cooler 7 imports after compensator 2 and the comb formula combination valve 3, passage 4 and sealing plate 5 are set under the import of elementary slag cooler 7, realize the sealing of high-temperature flue gas in the burner hearth, avoid big calorimetric flue gas to enter elementary slag cooler 7, elementary slag cooler 7 bottoms are provided with air distribution plate 16 and are positioned at the cooling air compartment 17 of air distribution plate 16 belows, cold air is transported to the air compartment 17 of slag cooler by high pressure positive blower through blast pipe 8 by the female pipe 15 of cooling air, 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, by elementary slag cooler cooling water inlet pipe 10 condensed water is fed cooling jacket, 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, finish its conveying by the scraper plate 20 that the middle and lower part in the elementary slag cooler 7 is provided with, the light pipe backwind tube 6 of hot blast after the heat exchange through manual push-pull valve is set returns boiler hearth of circulating fluidized bed, 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, enter secondary slag cooler 11 through elementary slag cooler scum pipe 9, secondary slag cooler 11 bottoms are provided with cooling jacket, by secondary slag cooler cooling water inlet pipe 19 condensed water is fed the further cooling that cooling jacket is finished end slag, the scraper plate 21 that is provided with by 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, to avoid flue gas to enter follow-up slag-conveying device, the cooling water of cooling back end slag is discharged and is recycled via secondary slag cooler CWR 18.
The cold slag slag conveyer of the wind and water combined cooling scraper-type of a kind of two-stage of the present invention operation principle is: the CFBB discharge temperature is about 900 ℃ end slag via CFBB scum pipe 1, behind compensator 2 and the comb formula combination valve 3, enter 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, scraper plate 20 by elementary slag cooler 7 is finished its conveying, 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 enters 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, finish it by the scraper plate 21 of secondary slag cooler 11 and carry, guarantee that temperature is not higher than 150 ℃ end slag and sends into follow-up slag-conveying device by scum pipe 13.
Claims (10)
1. cold slag slag conveyer of the wind and water combined cooling scraper-type of two-stage, comprise elementary slag cooler (7), the import of described 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 described elementary slag cooler (7) is provided with elementary slag cooler scraper plate (20), described cold slag slag conveyer also comprises secondary slag cooler (11), the import of described secondary slag cooler (11) is connected with the outlet of elementary slag cooler (7), middle and lower part in the described secondary slag cooler (11) is provided with secondary slag cooler scraper plate (21), the below of described secondary slag cooler (11) is provided with the cooling water heating surface, and the lower rear of described 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: described 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), 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: described 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 described elementary slag cooler (7).
5. cold slag slag conveyer according to claim 4 is characterized in that: described 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 described 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: described 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 described 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: described air-distribution device (16) is porous plate or blast cap.
10. cold slag slag conveyer according to claim 3 is characterized in that: described negative pressure pipe (12) adopts light pipe, and manual push-pull valve is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110257156 CN102287814B (en) | 2011-09-01 | 2011-09-01 | Two-stage wind-water joint cooling scraper-type cold slag conveyer |
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| CN 201110257156 CN102287814B (en) | 2011-09-01 | 2011-09-01 | Two-stage wind-water joint cooling scraper-type cold slag conveyer |
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| CN102287814A true CN102287814A (en) | 2011-12-21 |
| CN102287814B CN102287814B (en) | 2013-06-05 |
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Cited By (3)
| 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 |
| CN103900077A (en) * | 2014-03-24 | 2014-07-02 | 中国华能集团清洁能源技术研究院有限公司 | Integrated modification method for reducing pollutant emission of circulating fluidized bed boiler |
| CN105953222A (en) * | 2016-05-10 | 2016-09-21 | 钱伟 | Solid material energy comprehensive recovery system |
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2011
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Patent Citations (8)
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Cited By (4)
| 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 |
| CN103900077A (en) * | 2014-03-24 | 2014-07-02 | 中国华能集团清洁能源技术研究院有限公司 | Integrated modification method for reducing pollutant emission of circulating fluidized bed boiler |
| CN103900077B (en) * | 2014-03-24 | 2016-01-20 | 中国华能集团清洁能源技术研究院有限公司 | A kind of integrated remodeling method reducing CFBB pollutant emission |
| CN105953222A (en) * | 2016-05-10 | 2016-09-21 | 钱伟 | Solid material energy comprehensive recovery system |
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| CN102287814B (en) | 2013-06-05 |
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