CN201448827U - Circulating fluidized bed boiler (CFBB) with flow equalization pneumatic heat exchange bed - Google Patents
Circulating fluidized bed boiler (CFBB) with flow equalization pneumatic heat exchange bed Download PDFInfo
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- CN201448827U CN201448827U CN 200920033297 CN200920033297U CN201448827U CN 201448827 U CN201448827 U CN 201448827U CN 200920033297 CN200920033297 CN 200920033297 CN 200920033297 U CN200920033297 U CN 200920033297U CN 201448827 U CN201448827 U CN 201448827U
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Abstract
A circulating fluidized bed boiler (CFBB) with a flow equalization pneumatic heat exchange bed comprises a boiler hearth communicated with a high-temperature storage bin 2 of the heat exchange bed. The heat exchange bed is provided with a feed bin 1, a high-temperature storage bin 2, a flow equalization bin 3, a heat exchange bin 4 and a low-temperature storage bin 5, wherein water cooling partition walls are arranged among the bins, and the low-temperature storage bin 5 is communicated with the boiler hearth via a low-temperature return port 10; each of the bins forms an independent operable entirety with an air room 16, an air distribution plate 15, a wind cap 14, an air pipe 18 and a wind speed control device 19 which are arranged thereunder; and through regulating the wind speed of the bins to control the split ratio of the circulating ash, a portion of the circulating ash is directly returned to the boiler hearth 20 while the other portion is returned to the boiler hearth 20 after being cooled by a heat-exchange surface 6. The CFBB has the characteristics of extensive range of adjustment, uniform heat exchange, no pipe exposure caused by abrasion, and no mechanical failure, thereby being suitable for large-scale CFBBs.
Description
Technical field
The utility model relates to a kind of CFBB, particularly a kind ofly has a current-equalizing pneumatic heat exchanging bed CFBB.
Background technology
CFBB is present widely used a kind of clean coal utilization technology, increase along with the CFBB capacity, technical problems such as the ubiquity furnace inner space is limited, heating surface is arranged deficiency and stove inner screen type heating surface wear is serious, best solution is that the soft circulation circuit between separator and burner hearth is arranged external bed, a part of heat transferred external bed that circulating ash is loaded with, by adjusting the ratio of recycle stock amount between material returning valve and the external bed, control the ignition temperature in the burner hearth, and steam parameter is regulated.The large circulating fluidized bed boiler of existing operational excellence all is furnished with external bed both at home and abroad, for example French ALSTOM company technology adopts the external bed that has cone valve control, the principle of this control mode is that the ash part that high temperature cyclone separator is separated is sent burner hearth back to by material returning valve, a part is sent burner hearth back to after finishing exchange heat by external bed and its internal heating surface again, send into the ash amount of external bed and utilize cone valve control, when adopting this mechanical system to control, need adopt water cooling to the valve rod and the valve body of cone valve, complex structure, involve great expense, because the cone valve long-term work is at high temperature, in the high ash concentration environment, be very easy to wearing and tearing, maintenance workload is big, to be subjected to the general layout of spatial constraints external bed internal heating surface tightr in addition, space for maintenance is little, easy appearance vibration in service, concentrated wear, problems such as booster, this in addition arrangement makes external heat exchange bed need take certain height, be subjected to separator, the restriction of material returning valve version, often make that separator bottom standpipe height is lower, be difficult for forming enough material envelopes, influenced the stable operation in separative efficiency and outer circulation loop.
The existing external bed that does not adopt mechanical system control in the existing patent, compact splitting-type returning ash heat exchanger for example, specifically can from utility model patent specification 00238546.5, obtain understanding, be known that this compact splitting-type returning ash heat exchanger, the high temperature heat exchange bed need be arranged two groups of different heating surfaces with the low-temperature heat exchange bed, be subjected to spatial constraints, cause heat exchanger length bigger, sufficient space for maintenance can't be provided; Air compartment baffle adopts heat insulating construction, and long-term work intensity in hot environment can be affected; Enter the high temperature ash gravity flow easily of heat exchange bed; The air quantity that particularly needs to regulate low temperature feed back chamber, low-temperature heat exchange bed and high temperature heat exchange bed successively could be realized grey flow-dividing control, and the response time is longer, and shunting, the control characteristic of ash are not good enough.
Summary of the invention
The purpose of this utility model is the defective that overcomes above-mentioned prior art, a kind of current-equalizing pneumatic heat exchanging bed CFBB that has is provided, the heat exchange bed of this boiler and material returning device form integral structure, adopt the shunting ratio and the flow direction of pneumatic mode control recycle stock amount, have the advantages that adjustable range is wide, heat exchange even, do not have tube bank wearing and tearing booster and mechanical breakdown.
The technical solution of the utility model is achieved in that
A kind ofly have a current-equalizing pneumatic heat exchanging bed CFBB, comprise boiler furnace, boiler furnace is connected with the high temperature feed bin 2 of heat exchange bed by high temperature returning charge mouth 9, heat exchange bed has feeding warehouse 1, high temperature feed bin 2, current-sharing storehouse 3, heat exchange storehouse 4, low temperature feed bin 5 amounts to five storehouses, be provided with water-cooled partition wall 13 between each storehouse, wherein water-cooled partition wall 13 bottoms between feeding warehouse 1 and the high temperature feed bin 2 are provided with through-flow mouthful 7 of particle, water-cooled partition wall 13 bottoms between feeding warehouse 1 and the current-sharing storehouse 3 are provided with through-flow mouthful 8 of particle, particle is through-flow mouthful 8 water-cooled partition wall 13 bottoms that are located between feeding warehouse 1 and the high temperature feed bin 2, low temperature feed bin 5 is connected with boiler furnace by low temperature returning charge mouth 10.
Dispose heating surface 6 in the heat exchange storehouse 4.
The bottom of feeding warehouse 1, high temperature feed bin 2, current-sharing storehouse 3, heat exchange storehouse 4, low temperature feed bin 5 all is furnished with air distribution plate 14, and blast cap 15 is installed, and each air distribution plate 14 bottom all independently is furnished with airduct 18, disposes wind speed control device 19 on the airduct 18.
The wind speed of feeding warehouse 1, high temperature feed bin 2, current-sharing storehouse 3, heat exchange storehouse 4, low temperature feed bin 5 is by the wind speed control device 19 independent controls in each storehouse, the fluidising air velocity in each storehouse is controlled at 0.1～2m/s, the circulating ash quantity that high temperature returning charge mouth 9 flows out is regulated by the wind speed of high temperature feed bin 2, and the circulating ash quantity that low temperature returning charge mouth 10 flows out is regulated by the wind speed in current-sharing storehouse 3.
The utility model adopts pneumatic low speed current method to realize the shunting and the control of high-temp circulating ash, and adjustable range is wide, heat exchange is even, do not have tube bank wearing and tearing booster and mechanical breakdown, is applicable to large circulating fluidized bed boiler.
The utility model has the advantages that:
1. utilize pneumatic low speed current method, realize the shunting and the control of high-temp circulating ash by regulating wind speed, mechanical breakdown can not take place in the control flexibility and reliability, and manufacturing and maintenance operation cost are little,
2. be furnished with the current-sharing storehouse, circulating ash shunting adjustable range is wide, the operation response time is short, makes Steam Temperature for Boiler parameter, bed temperature parameter and load parameter have good control characteristic;
3. heat exchange bed and material returning device form integral structure, are convenient to arrange;
4. but its working life of water-cooling structure significant prolongation of water-cooled partition wall;
5. flow in the passage of ash particle between each sheet tube panel, can not cause the vibration and the erosive wear of tube panel, the tube bank long service life.
Description of drawings
Fig. 1 is the main cutaway view of the vertical tube panel structure of full suspention of the present utility model.
Fig. 2 is that the A-A of Fig. 1 is to view.
Fig. 3 is the main cutaway view that partly suspends horizontal tube panel structure in midair of the present utility model.
Fig. 4 is an arrangement schematic diagram of the present utility model.
Fig. 5 is that wind speed of the present utility model distributes schematic diagram.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
As Fig. 1,2,3,4, shown in 5, a kind of current-equalizing pneumatic heat exchanging bed CFBB that has described in the utility model, comprise boiler furnace, boiler furnace is connected with the high temperature feed bin 2 of heat exchange bed by high temperature returning charge mouth 9, heat exchange bed has feeding warehouse 1, high temperature feed bin 2, current-sharing storehouse 3, heat exchange storehouse 4, low temperature feed bin 5 amounts to five storehouses, be provided with water-cooled partition wall 13 between each storehouse, water-cooled partition wall 13 is made of the pipe row who is arranged in parallel, logical cooling water in the pipe, outer wall lays the wearing-proof refractory material that is fixed on outer tube surface by pin. and wherein water-cooled partition wall 13 bottoms between feeding warehouse 1 and the high temperature recycling storehouse 2 are provided with through-flow mouthful 7 of particle, water-cooled partition wall 13 bottoms between feeding warehouse 1 and the current-sharing storehouse 3 are provided with through-flow mouthful 8 of particle, particle is through-flow mouthful 8 water-cooled partition wall 13 bottoms that also can be located between feeding warehouse 1 and the high temperature feed bin 2, particle is through-flow mouthfuls 7,8 purpose is to make that ash particle can be from feeding warehouse 1 to high temperature feed bin 2, flow in current-sharing storehouse 3.
The wind speed of feeding warehouse 1, high temperature feed bin 2, current-sharing storehouse 3, heat exchange storehouse 4, low temperature feed bin 5 is used U respectively
1, U
2, U
3, U
4, U
5Expression, wind speed can independently be controlled, and generally the fluidising air velocity in each storehouse is controlled at 0.1～2m/s, and the circulating ash quantity that high temperature returning charge mouth 9 flows out in the running is by the wind velocity U of high temperature feed bin 2
2Regulate, the circulating ash quantity that low temperature returning charge mouth 10 flows out is by the wind velocity U in current-sharing storehouse 3
3Regulate, can control steam temperature and regulate bed temperature by the shunting ratio and the flow direction that change the recycle stock amount.Each storehouse lower disposed has air distribution plate 14, and blast cap 15 is installed, and is used to guarantee that fluidisation is uniform and stable in the heat exchange bed.
As shown in Figure 1, heating surface 6 in the heat exchange storehouse 4 is the vertical tube panel structure of full suspention, the influent header 11 of tube panel and outlet header 12 are all on heat exchange bed top, tube panel can freely expand downwards, flow in the passage of ash particle between each sheet tube panel, the direction that moves horizontally of ash particle is parallel to the interior vapor level flow direction of tube panel.Feeding warehouse 1, high temperature feed bin 2 are supplied with wind regime by independent returning charge blower fan, and current-sharing storehouse 3, heat exchange storehouse 4, low temperature feed bin 5 are supplied with wind regime by independent heat exchange bed blower fan.
As shown in Figure 3, heating surface 6 in the heat exchange storehouse 4 is the horizontal tube panel structure of half suspention, the outlet header 12 of tube panel is on heat exchange bed top, the influent header 11 of tube panel is in the air compartment 16 in heat exchange storehouse 4, pipe passes air distribution plate 14 and links to each other with influent header 11, and the direction that moves horizontally of the ash particle in the heat exchange storehouse 4 is parallel to the interior vapor level flow direction of tube panel.Feeding warehouse 1, high temperature feed bin 2 are supplied with wind regime by independent returning charge blower fan, and current-sharing storehouse 3, heat exchange storehouse 4, low temperature feed bin 5 are supplied with wind regime by independent heat exchange bed blower fan.
As shown in Figure 4, it is the current-equalizing pneumatic heat exchanging bed arrangement of a kind of typical 300MW CFBB, this arrangement is arranged in the boiler left and right sides respectively with four heat exchange beds, be furnished with high temperature reheater and low temperature superheater in the heat exchange bed, low temperature superheater and high temperature reheater are divided into cold section and hot arc again.Heating surface 6 in the heat exchange storehouse 4 of two heat exchange beds that the left and right sides is arranged in parallel is in series, and the high temperature feed bin 2 of every heat exchange bed is connected with burner hearth 20 by high temperature returning charge mouth 9, and the low temperature feed bin 5 of every heat exchange bed is connected with burner hearth 20 by low temperature returning charge mouth 10.
The operation principle of heat exchange bed is: through-flow mouth 7,8 and suitable wind speed that feeding warehouse 1 utilizes mutual lappet to put will split into two parts from the ash particle that is entered by standpipe 17 of whirlwind separator, a part is returned burner hearth 20 from high temperature returning charge mouth 9 as high temperature ash (800～900 ℃), another part is by the grain flow through hole 8 of feeding warehouse 1 bottom, enter current-sharing storehouse 3 and heat exchange storehouse 4 successively, carry out heat exchange in its 4 inside, heat exchange storehouse and heating surface 6, be cooled to the arrival of back below 650 ℃ low temperature feed bin 5, return burner hearth 20 by low temperature returning charge mouth 10 at last.
The requirement difference of each storehouse wind speed, wherein feeding warehouse 1 corresponding air speed U
1The subcritical fluidising air velocity only plays loosening effect; High temperature feed bin 2 and low temperature feed bin 5 corresponding air speed U
2, U
5Should be greater than critical fluidising air velocity, to guarantee that goods fluid well returns burner hearth 20 smoothly; Current-sharing storehouse 3 corresponding air speed U
3Be mainly used in the ash amount that control enters heat exchange storehouse 4, reduction current-sharing wind U in service
3, the ash amount that flows to heat exchange storehouse 4 can reduce, and the low temperature feed back amount reduces, and then the bed temperature of boiler raises; Increase current-sharing wind U in service
3, the ash amount that flows to heat exchange storehouse 4 can increase, and the low temperature feed back amount increases, and then the bed temperature of boiler reduces.Enter the wind velocity U in heat exchange storehouse 4
4Keep material low speed fluidisation, to prevent that heating surface is caused wearing and tearing.
Among the figure: the 1-feeding warehouse; 2-high temperature feed bin; 3-current-sharing storehouse; 4-heat exchange storehouse; 5-low temperature feed bin; The 6-heating surface; 7, the 8-particle is through-flow mouthful; 9-high temperature returning charge mouth; 10-low temperature returning charge mouth; 11-tube panel influent header; 12-tube panel outlet header; 13-water-cooled partition wall; The 14-air distribution plate; The 15-blast cap; The 16-air compartment; The 17-standpipe; The 18-airduct; The 19-air speed control device; The 20-burner hearth; U1-feeding warehouse wind speed; U2-high temperature feed bin wind speed; U3-current-sharing storehouse wind speed; U4-heat exchange storehouse wind speed; U5-low temperature feed bin wind speed.
Claims (6)
1. one kind has current-equalizing pneumatic heat exchanging bed CFBB, comprise boiler furnace, it is characterized in that, boiler furnace is connected with the high temperature feed bin (2) of heat exchange bed by high temperature returning charge mouth (9), heat exchange bed has feeding warehouse (1), high temperature feed bin (2), current-sharing storehouse (3), heat exchange storehouse (4), low temperature feed bin (5) amounts to five storehouses, be provided with water-cooled partition wall (13) between each storehouse, wherein water-cooled partition wall (13) bottom between feeding warehouse (1) and the high temperature feed bin (2) is provided with through-flow mouthful of particle (7), water-cooled partition wall (13) bottom between feeding warehouse (1) and current-sharing storehouse (3) is provided with through-flow mouthful of particle (8), particle is through-flow mouthful (8) is located at water-cooled partition wall (13) bottom between feeding warehouse (1) and the high temperature feed bin (2), and low temperature feed bin (5) is connected with boiler furnace by low temperature returning charge mouth (10).
2. a kind of current-equalizing pneumatic heat exchanging bed CFBB that has according to claim 1 is characterized in that, disposes heating surface (6) in heat exchange storehouse (4).
3. a kind of current-equalizing pneumatic heat exchanging bed CFBB that has according to claim 1, it is characterized in that, the bottom of feeding warehouse (1), high temperature feed bin (2), current-sharing storehouse (3), heat exchange storehouse (4), low temperature feed bin (5) all is furnished with air distribution plate (14), and blast cap (15) is installed, each air distribution plate (14) bottom all independently is furnished with airduct (18), disposes wind speed control device (19) on the airduct (18).
4. a kind of current-equalizing pneumatic heat exchanging bed CFBB that has according to claim 3, it is characterized in that, the wind speed of feeding warehouse (1), high temperature feed bin (2), current-sharing storehouse (3), heat exchange storehouse (4), low temperature feed bin (5) is by the independent control of the wind speed control device (19) in each storehouse, the fluidising air velocity in each storehouse is controlled at 0.1～2m/s, the circulating ash quantity that high temperature returning charge mouth (9) flows out is regulated by the wind speed of high temperature feed bin (2), and the circulating ash quantity that low temperature returning charge mouth (10) flows out is regulated by the wind speed of current-sharing storehouse (3).
5. a kind of current-equalizing pneumatic heat exchanging bed CFBB that has according to claim 2, it is characterized in that, heating surface (6) in the heat exchange storehouse (4) is the vertical tube panel structure of full suspention, influent header of tube panel (11) and outlet header (12) are all on heat exchange bed top, tube panel can freely expand downwards, flow in the passage of ash particle between each sheet tube panel, the direction that moves horizontally of ash particle is parallel to the interior vapor level flow direction of tube panel.
6. a kind of current-equalizing pneumatic heat exchanging bed CFBB that has according to claim 2, it is characterized in that, heating surface (6) in the heat exchange storehouse (4) is the horizontal tube panel structure of half suspention, the outlet header of tube panel (12) is on heat exchange bed top, the influent header of tube panel (11) is in the air compartment (16) of heat exchange storehouse (4), pipe passes air distribution plate (14) and links to each other with influent header (11), and the direction that moves horizontally of ash particle is parallel to the interior vapor level flow direction of tube panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920033297 CN201448827U (en) | 2009-05-26 | 2009-05-26 | Circulating fluidized bed boiler (CFBB) with flow equalization pneumatic heat exchange bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920033297 CN201448827U (en) | 2009-05-26 | 2009-05-26 | Circulating fluidized bed boiler (CFBB) with flow equalization pneumatic heat exchange bed |
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| Publication Number | Publication Date |
|---|---|
| CN201448827U true CN201448827U (en) | 2010-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920033297 Expired - Fee Related CN201448827U (en) | 2009-05-26 | 2009-05-26 | Circulating fluidized bed boiler (CFBB) with flow equalization pneumatic heat exchange bed |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839477A (en) * | 2010-06-10 | 2010-09-22 | 西安热工研究院有限公司 | Compound furnace profile circulating fluidized bed boiler |
| CN103604121A (en) * | 2013-11-29 | 2014-02-26 | 重庆大学 | Oil shale semicoke fluidized bed combustion system adopting triple-channel shunting control refeeder |
| CN111121006A (en) * | 2018-11-01 | 2020-05-08 | 中国科学院工程热物理研究所 | Horizontal pulverized coal boiler and control method thereof |
| CN114939384A (en) * | 2022-04-13 | 2022-08-26 | 东方电气集团东方锅炉股份有限公司 | Fluidized bed with cooling type partition wall |
-
2009
- 2009-05-26 CN CN 200920033297 patent/CN201448827U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839477A (en) * | 2010-06-10 | 2010-09-22 | 西安热工研究院有限公司 | Compound furnace profile circulating fluidized bed boiler |
| CN101839477B (en) * | 2010-06-10 | 2011-07-27 | 西安热工研究院有限公司 | Compound furnace profile circulating fluidized bed boiler |
| CN103604121A (en) * | 2013-11-29 | 2014-02-26 | 重庆大学 | Oil shale semicoke fluidized bed combustion system adopting triple-channel shunting control refeeder |
| CN111121006A (en) * | 2018-11-01 | 2020-05-08 | 中国科学院工程热物理研究所 | Horizontal pulverized coal boiler and control method thereof |
| CN111121006B (en) * | 2018-11-01 | 2021-03-26 | 中国科学院工程热物理研究所 | Horizontal pulverized coal boiler and control method thereof |
| CN114939384A (en) * | 2022-04-13 | 2022-08-26 | 东方电气集团东方锅炉股份有限公司 | Fluidized bed with cooling type partition wall |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100505 Termination date: 20160526 |
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| CF01 | Termination of patent right due to non-payment of annual fee |