CN203286556U - Circular suspended heat exchange screen of circulating fluidized bed boiler - Google Patents
Circular suspended heat exchange screen of circulating fluidized bed boiler Download PDFInfo
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- CN203286556U CN203286556U CN2013202088003U CN201320208800U CN203286556U CN 203286556 U CN203286556 U CN 203286556U CN 2013202088003 U CN2013202088003 U CN 2013202088003U CN 201320208800 U CN201320208800 U CN 201320208800U CN 203286556 U CN203286556 U CN 203286556U
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Abstract
A circular suspended heat exchange screen of a circulating fluidized bed boiler comprises suspended type platen super-heaters, re-heaters, and a plurality of screen pieces of a water cooling screen, wherein each screen piece comprises a pipe and fins; a heat medium flows in the pipe; the screen pieces form a circular or semi-circular single-group suspended screen in a surrounding manner; the screen pieces are connected with one another fully or partially.
Description
Technical field:
The utility model relates to a kind of novel suspention heat exchange screen structure, is applicable to a kind of suspension type screen formula heat exchanger in the large circulating fluidized bed boiler burner hearth.
Background technology:
Along with the increase of CFBB capacity, need the heating surface area change of arranging at its main circulation loop (burner hearth, separator and revert system loop), wherein in upper furnace, arrange that curtain wall is a kind of conventional design.
CFBB suspension type screen formula heat exchanger structurally is mostly monolithic parallel and arranges formula at present, adopts aerofoil profile (wing wall) mode to be arranged in the upper furnace zone., in overcritical, ultra supercritical parameter evolution, often to arrange that the suspention screen more, that length is longer could meet the requirement of Boiler Steam parameter and load along with the increase of boiler capacity, particularly boiler in large circulating fluidized bed boiler.
At this moment, if these suspention heating surfaces all adopt the mode of furnace roof suspention screen, the one, can cause the distance between sheet and sheet less than normal, affect the heating surface heat absorption; The 2nd, because the height of screen increases, its rigidity is affected, and easily rocks in running, easily produces flexural deformation, causes wearing and tearing; In addition, shield the length increase working medium flow in the monolithic screen is increased, make tube panel be prone to superheating phenomenon, the large difference in height of long screen also is prone to the inhomogeneous phenomenon of being heated, to impacting the service life of suspending screen in midair.
Zhejiang University research shows, for the large circulating fluidized bed boiler burner hearth, it is little that the granule density that is suspended in upper furnace heat exchange screen surfaces and speed are compared with water-cooling wall wall place, and this just makes heat transfer efficiency of the screen that conducts heat lower than the water-cooling wall of same area.If need to absorb same heat, the area of screen is larger.
In CFBB, the granule density of heating surface and speed are the key factors that affects the heat-transfer area heat transfer coefficient.The granule density of heat exchange screen surfaces is relative with speed little, means that its heat transfer coefficient is relatively little, absorbs same caloric requirement more heat-transfer surface is set.Therefore, in limited upper furnace space, need ingehious design to form to coincide large-size circulating fluidized bed burner hearth gas-solid flow bulk properties rule, guarantee certain screen spacing, the heat transfer screen that intensity is high, wearing and tearing are little, the requirement of arranging more heating surfaces at main circulation loop after meeting CFBB and maximizing.Overcome simultaneously large, long heat transfer efficiency, rigidity and the life problems of bringing of monolithic screen.
For even upper furnace air-flow, applicant Zhu Zhenjin proposes to arrange the method (patent No. 99226485.5) of the dividing wall angled with hearth wall in burner hearth in coal-powder boiler, has solved to a certain extent the problem of air-flow heating power inequality.This patent proposes for pulverized-coal fired boiler, and the gas-solid flow field characteristic in pulverized-coal fired boiler and the gas-solid flow field characteristic in the recirculating fluidized bed burner hearth are different.
Therefore, disclose a kind of energy coincide large-size circulating fluidized bed burner hearth gas-solid flow bulk properties rule, guarantee certain screen spacing, the heat transfer screen that intensity is high, wearing and tearing are little, and can reduce to suspend in midair screen length, increase the suspention screen intensity, strengthen suspention screen heat-transfer effect device very necessary.
Summary of the invention:
The utility model will overcome large, long heat transfer efficiency, rigidity and the life problems of bringing of the suspention heat exchange screen monolithic screen of existing large Capacity Circulating Fluidized Bed Boilers, a kind of suspention heat exchange screen that more can adapt at present large Capacity Circulating Fluidized Bed Boilers is provided, make it can arrange more heating surfaces in main circulation loop, can utilize better furnace cavity, meet the requirement of Boiler Steam parameter and load, simultaneously can increase the furnace cavity utilization rate, reduce furnace height, strengthen suspention heat exchange screen intensity, avoid superheating phenomenon to occur, improve its service life.
Boiler hearth of circulating fluidized bed round suspention heat exchange screen described in the utility model, the screen sheet that comprises suspension type pendant superheater, reheater, water-cooling screen, it is characterized in that: described screen sheet consists of pipe and the fin of circulation heating agent, some described screen sheets enclose the single-group type suspention screen of round or half round, and between described screen sheet, full connection or part connect.
Preferably, the single-group type of described half round suspention screen is every 3 and encloses " Contraband " shape, and the single-group type suspention screen of described round is every 4 and encloses " mouth " shape.
Preferably, " Contraband " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, " Contraband " shape opening direction wall after burner hearth, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
Further, " Contraband " shape opening has gas-solid flow outlet 3 on " Contraband " shape heat-transfer surface top when anti-separator direction is arranged, the open height h of gas-solid flow outlet 3 is 0～1 with the scope of the ratio h/H of suspention heat exchange screen height H.
Perhaps, preferably, " mouth " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, and " mouth " heat-transfer surface top has gas-solid flow outlet 3, and open height h is 0～1 with the scope of the ratio h/H of suspention heat exchange screen height H.
Further, opening wall after burner hearth on " mouth " heat-transfer surface top, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
Distance b≤the 1/2W apart from the boiler furnace front wall is shielded in layout in burner hearth " Contraband " shape, the suspention of " mouth " shape, and W represents furnace depth or width.
Further again, the arrangement of single-group type suspention screen in burner hearth is that one chip is arranged with the staggered interval of " Contraband " shape, or one chip and the staggered interval of " mouth " shape layout, or the staggered interval of " Contraband " shape and " mouth " shape arranges, or one chip, " Contraband " shape, three kinds of staggered intervals layouts of " Contraband " shape.
The utility model has the advantages that: the suspention heat exchange screen that adapts at present large Capacity Circulating Fluidized Bed Boilers, make it can arrange more heating surfaces in main circulation loop, can utilize better furnace cavity, meet the requirement of Boiler Steam parameter and load, energy, increase the furnace cavity utilization rate simultaneously, reduce furnace height, strengthen suspention heat exchange screen intensity, avoid superheating phenomenon to occur, improve its service life.
Description of drawings
Fig. 1 is partial 3 d schematic diagram of the present utility model
Fig. 2 is that screen sheet of the present utility model encloses the mode schematic diagram
Fig. 3 a, 3b, 3c and 3d are respectively one of the utility model basic arrangement forms in burner hearth
Fig. 4 a and 4b are the schematic diagrames that has around the round suspention heat exchange screen of window of tube
Fig. 5 a and 5b are conventional one-piece formula suspention heat exchange screen arrangement schematic diagrames
Fig. 6 a and 6b are the connected mode schematic diagrames between the screen sheet
Fig. 7 a and 7b are the annular header schematic diagrames.
The specific embodiment
With reference to accompanying drawing 1-7b:
Boiler hearth of circulating fluidized bed round suspention heat exchange screen described in the utility model, the screen sheet that comprises suspension type pendant superheater, reheater, water-cooling screen, it is characterized in that: described screen sheet consists of pipe and the fin of circulation heating agent, some described screen sheets enclose the single-group type suspention screen of round or half round, and between described screen sheet, full connection or part connect.
Preferably, the single-group type of described half round suspention screen is every 3 and encloses " Contraband " shape, and the single-group type suspention screen of described round is every 4 and encloses " mouth " shape.
Preferably, " Contraband " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, " Contraband " shape opening direction wall after burner hearth, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
Further, " Contraband " shape opening has gas-solid flow outlet 3 on " Contraband " shape heat-transfer surface top when anti-separator direction is arranged, the open height h of gas-solid flow outlet 3 is 0～1 with the scope of the ratio h/H of suspention heat exchange screen height H.
Perhaps, preferably, " mouth " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, and " mouth " heat-transfer surface top has gas-solid flow outlet 3, and open height h is 0～1 with the scope of the ratio h/H of suspention heat exchange screen height H.
Further, opening wall after burner hearth on " mouth " heat-transfer surface top, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
Distance b≤the 1/2W apart from the boiler furnace front wall is shielded in layout in burner hearth " Contraband " shape, the suspention of " mouth " shape, and W represents furnace depth or width.
Further again, the arrangement of single-group type suspention screen in burner hearth is that one chip is arranged with the staggered interval of " Contraband " shape, or one chip and the staggered interval of " mouth " shape layout, or the staggered interval of " Contraband " shape and " mouth " shape arranges, or one chip, " Contraband " shape, three kinds of staggered intervals layouts of " Contraband " shape.
Suspention heat exchange screen basic structure of the present utility model is " Contraband " shape or " mouth " shape, as shown in Figure 2, suspension type pendant superheater by 3 or 4 one chips shields around forming the single-group type suspention, suspention screen sheet 1 is comprised of pipe and fin, connect to form the round suspention heat exchange screen of " Contraband " shape or " mouth " shape between screen sheet and screen sheet by fin, top and bottom can be connected with header or annular header 5.Connected mode between screen sheet and screen sheet can all link together by fin as shown in Figure 6 b, also can as shown in Figure 6 a, with fin, adjacent two be coupled together at a certain distance.Compare with former " Shu " shape suspention screen commonly used, both can increase screen sheet intensity, it is in operation is difficult for producing distortion.
In " Contraband " shape of the present utility model or " mouth " shape suspention heat exchange screen structure, can be on its heat-transfer surface top to offer the gas-solid flow window of suitable size around pipe group form, as shown in Figs. 4a and 4b, the gas-solid flow in flow through " Contraband " shape or " mouth " shape suspention heat exchange screen is flowed out from this window.The height h of window is 0～1 with the scope of the ratio h/H of suspention heat exchange screen height H.Window towards generally towards the separator inlet direction, also can be after burner hearth wall, or front wall, or left and right side wall.
The utility model at the arrangement form in the recirculating fluidized bed burner hearth as shown in Fig. 3 a to 3d, " Contraband " shape, " mouth " shape with " Shu " but the shape interval be arranged in burner hearth.Namely can all be arranged as a kind of structure in front two kinds of structures, also can two kinds of structures replace layout, or with in monolithic/interspersed layout of group suspention screen and front two schemes.Distance b≤the 1/2W apart from the boiler furnace front wall is shielded in " Contraband " shape, the suspention of " mouth " shape, and W represents furnace depth or width (Fig. 3 a to 3d).
Can find out from Fig. 5 a and 5b, compare with non-round suspention heating screen, " Contraband " shape or " mouth " shape suspention heating screen can be arranged more heating surface in the same space of boiler hearth of circulating fluidized bed, can utilize better the space in burner hearth, and the average effective between screen and screen, apart from increase, has been eliminated because of the screen too small subsides screen-wall particle aggregation that causes of spacing and the too small phenomenon of speed.The increase of the particle decrease speed of the cold wall of agio 2 and suspention screen-wall face 1 before can be like this, eliminate heating surface absorbed the disadvantageous negative factor of heat, makes its large-size circulating fluidized bed burner hearth gas-solid flow bulk properties rule of more coincideing, and improves heat transfer efficiency.
Can find out from basic structure of the present utility model, " Contraband " shape or " mouth " shape suspention heating screen can increase to some extent at width, and namely short transverse can reduce to some extent.Can reduce like this difference in height of monolithic screen, shorten the working medium flow in single pipe, can avoid thus the generation of superheating phenomenon, extend the service life of screen.
The described content of this specification embodiment is only enumerating the way of realization of utility model design; protection domain of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection domain of the present utility model also reaches the equivalent technologies means that design can be expected according to the utility model in those skilled in the art.
Claims (8)
1. boiler hearth of circulating fluidized bed round suspention heat exchange is shielded, the screen sheet that comprises suspension type pendant superheater, reheater, water-cooling screen, it is characterized in that: described screen sheet consists of pipe and the fin of circulation heating agent, some described screen sheets enclose the single-group type suspention screen of round or half round, and between described screen sheet, full connection or part connect.
2. heat exchange as claimed in claim 1 screen is characterized in that: the single-group type suspention screen of described half round is every 3 and encloses " Contraband " shape, and the single-group type suspention screen of described round is every 4 and encloses " mouth " shape.
3. heat exchange as claimed in claim 2 is shielded, and it is characterized in that: " Contraband " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, " Contraband " shape opening direction wall after burner hearth, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
4. heat exchange as claimed in claim 3 is shielded, it is characterized in that: " Contraband " shape opening has gas-solid flow outlet 3 on " Contraband " shape heat-transfer surface top when anti-separator direction is arranged, the open height h of gas-solid flow outlet 3 is 0～1 with the scope of the ratio h/H of suspention heat exchange screen height H.
5. heat exchange as claimed in claim 2 is shielded, it is characterized in that: " mouth " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, " mouth " heat-transfer surface top has gas-solid flow outlet 3, and open height h is 0～1 with the scope of the ratio h/H of suspention heat exchange screen height H.
6. heat exchange screen as claimed in claim 5, is characterized in that: opening wall after burner hearth on " mouth " heat-transfer surface top, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
7. heat exchange as described in one of claim 1-6 is shielded, and it is characterized in that: the distance b≤1/2W apart from the boiler furnace front wall is shielded in the layout in burner hearth " Contraband " shape, the suspention of " mouth " shape, and W represents furnace depth or width.
8. heat exchange as claimed in claim 7 is shielded, it is characterized in that: the arrangement of single-group type suspention screen in burner hearth is that one chip is arranged with the staggered interval of " Contraband " shape, or one chip and the staggered interval of " mouth " shape layout, or the staggered interval of " Contraband " shape and " mouth " shape arranges, or one chip, " Contraband " shape, three kinds of staggered intervals layouts of " Contraband " shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202088003U CN203286556U (en) | 2013-04-22 | 2013-04-22 | Circular suspended heat exchange screen of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202088003U CN203286556U (en) | 2013-04-22 | 2013-04-22 | Circular suspended heat exchange screen of circulating fluidized bed boiler |
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| CN203286556U true CN203286556U (en) | 2013-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013202088003U Expired - Fee Related CN203286556U (en) | 2013-04-22 | 2013-04-22 | Circular suspended heat exchange screen of circulating fluidized bed boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175197A (en) * | 2013-04-22 | 2013-06-26 | 浙江大学 | Ring-shaped hanging heat transfer screen of circulating fluidized bed boiler furnace |
| CN108150992A (en) * | 2017-12-22 | 2018-06-12 | 河南金土商贸有限公司 | A kind of boiler of adjustable heating surface area |
-
2013
- 2013-04-22 CN CN2013202088003U patent/CN203286556U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175197A (en) * | 2013-04-22 | 2013-06-26 | 浙江大学 | Ring-shaped hanging heat transfer screen of circulating fluidized bed boiler furnace |
| CN103175197B (en) * | 2013-04-22 | 2015-11-18 | 浙江大学 | Boiler hearth of circulating fluidized bed round suspention heat exchange screen |
| CN108150992A (en) * | 2017-12-22 | 2018-06-12 | 河南金土商贸有限公司 | A kind of boiler of adjustable heating surface area |
| CN108150992B (en) * | 2017-12-22 | 2019-11-12 | 东阳市天杨建筑工程设计有限公司 | A kind of boiler of adjustable heating surface area |
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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: 20131113 |
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| CF01 | Termination of patent right due to non-payment of annual fee |