CN103175197B - Boiler hearth of circulating fluidized bed round suspention heat exchange screen - Google Patents
Boiler hearth of circulating fluidized bed round suspention heat exchange screen Download PDFInfo
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- CN103175197B CN103175197B CN201310142880.1A CN201310142880A CN103175197B CN 103175197 B CN103175197 B CN 103175197B CN 201310142880 A CN201310142880 A CN 201310142880A CN 103175197 B CN103175197 B CN 103175197B
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Abstract
Boiler hearth of circulating fluidized bed round suspention heat exchange screen, comprise the screen sheet of suspension type pendant superheater, reheater, water-cooling screen, described screen sheet is made up of the pipe of the heating agent that circulates and fin, 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.
Description
Technical field:
The present invention relates to a kind of novel suspention heat exchange screen structure, be applicable to a kind of suspension type screen formula heat exchanger in large circulating fluidized bed boiler burner hearth.
Background technology:
Along with the increase of CFBB capacity, need the heating surface area arranged to increase at its main circulation loop (burner hearth, separator and revert system loop), wherein arrange that curtain wall is a kind of conventional design in upper furnace.
Current CFBB suspension type screen formula heat exchanger is structurally mostly monolithic and is arranged in parallel formula, adopts aerofoil profile (wingwall) mode to be arranged in upper furnace region.Along with the increase of boiler capacity, particularly boiler are in overcritical, ultra supercritical parameter evolution, in large circulating fluidized bed boiler, often to arrange that suspention screen that more, length is longer could meet the requirement of Boiler Steam parameter and load.
At this moment, if these suspention heating surfaces all adopt furnace roof to suspend the mode of screen in midair, one is to cause the distance between sheet and sheet less than normal, affects heating surface heat absorption; Two is that its rigidity is affected, and easily rocks in running, easily produces flexural deformation, causes wearing and tearing because the height of screen increases; In addition, the working medium flow during the increase of screen length also can make monolithic shield increases, and makes tube panel easily occur superheating phenomenon, and the large difference in height of long screen also easily occurs uneven phenomenon of being heated, and can impact the service life of suspention screen.
Zhejiang University's research shows, for large circulating fluidized bed boiler burner hearth, the granule density being suspended in upper furnace heat exchange screen surfaces is little compared with water-cooling wall wall place with speed, and this just makes the heat transfer efficiency of heat transfer screen 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 affecting 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 and arranges more heat-transfer surface.Therefore, in limited upper furnace space, need ingehious design to form identical large-size circulating fluidized bed burner hearth gas-solid flow bulk properties rule, ensure necessarily to shield spacing, intensity heat transfer that is high, that wear and tear little is shielded, and arranges the requirement of more heating surfaces after meeting CFBB maximization at main circulation loop.Heat transfer efficiency, rigidity and life problems that large, the long band that overcome monolithic screen are come simultaneously.
For even upper furnace air-flow, in coal-powder boiler, applicant Zhu Zhenjin proposes the method (patent No. 99226485.5) of arranging the dividing wall angled with hearth wall in burner hearth, solves the problem of air-flow heating power inequality to a certain extent.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 recirculating fluidized bed burner hearth are different.
Therefore, disclose a kind of large-size circulating fluidized bed burner hearth gas-solid flow bulk properties rule of coincideing, ensure necessarily to shield the heat transfer screen that spacing, intensity are high, wear and tear little, and can reduce to suspend in midair screen length, increase suspention screen intensity, strengthen that to suspend the device shielding heat-transfer effect in midair very necessary.
Summary of the invention:
Heat transfer efficiency, rigidity and life problems that large, long band that the present invention will overcome the suspention heat exchange screen monolithic screen of existing Large Copacity CFBB are come, a kind of suspention heat exchange screen that more can adapt to current Large Copacity CFBB is provided, make it can arrange more heating surfaces in main circulation loop, furnace cavity can be utilized better, meet the requirement of Boiler Steam parameter and load, furnace cavity utilization rate can be increased simultaneously, 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 of the present invention, comprise the screen sheet of suspension type pendant superheater, reheater, water-cooling screen, it is characterized in that: described screen sheet is made up of the pipe of the heating agent that circulates and fin, 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 suspention screen of half described 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.
Preferably, " Contraband " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, and " Contraband " shape opening direction is towards wall after burner hearth, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
Further, have gas-solid flow outlet 3 when " Contraband " shape opening is arranged towards anti-separator direction on " Contraband " shape heat-transfer surface top, the scope that the ratio h/H of height H is shielded in open height h and the suspention heat exchange of gas-solid flow outlet 3 is 0 ~ 1.
Or preferably, " mouth " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, it is 0 ~ 1 that " mouth " heat-transfer surface top has the scope that gas-solid flow outlet 3, open height h and suspention heat exchange shield the ratio h/H of height H.
Further, the opening on " mouth " heat-transfer surface top is towards wall after burner hearth, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
Layout " Contraband " shape in burner hearth, " mouth " shape suspention screen represent furnace depth or width apart from the distance b≤1/2W, W of boiler furnace front wall.
Further again, the arrangement of single-group type suspention screen in burner hearth is that one chip and " Contraband " shape interval that interlocks is arranged, or one chip and " mouth " shape interval that interlocks is arranged, or " Contraband " shape and " mouth " shape interval that interlocks is arranged, or one chip, " Contraband " shape, the staggered interval of " Contraband " shape three kinds are arranged.
Advantage of the present invention is: the suspention heat exchange screen adapting to current Large Copacity CFBB, make it can arrange more heating surfaces in main circulation loop, furnace cavity can be utilized better, meet the requirement of Boiler Steam parameter and load, simultaneously energy, increase furnace cavity utilization rate, reduce furnace height, strengthen suspention heat exchange screen intensity, avoid superheating phenomenon to occur, improve its service life.
Accompanying drawing explanation
Fig. 1 is partial 3 d schematic diagram of the present invention
Fig. 2 is that screen sheet of the present invention encloses mode schematic diagram
Fig. 3 is the basic arrangement form of the present invention in burner hearth
Fig. 4 is the schematic diagram of the round suspention heat exchange screen had around window of tube
Fig. 5 is conventional one-piece formula suspention heat exchange screen arrangement schematic diagram
Fig. 6 a and Fig. 6 b is the connected mode schematic diagram between screen sheet
Fig. 7 is annular header schematic diagram.
Detailed description of the invention
With reference to accompanying drawing 1-7:
Boiler hearth of circulating fluidized bed round suspention heat exchange screen of the present invention, comprise the screen sheet of suspension type pendant superheater, reheater, water-cooling screen, it is characterized in that: described screen sheet is made up of the pipe of the heating agent that circulates and fin, 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 suspention screen of half described 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.
Preferably, " Contraband " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, and " Contraband " shape opening direction is towards wall after burner hearth, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
Further, have gas-solid flow outlet 3 when " Contraband " shape opening is arranged towards anti-separator direction on " Contraband " shape heat-transfer surface top, the scope that the ratio h/H of height H is shielded in open height h and the suspention heat exchange of gas-solid flow outlet 3 is 0 ~ 1.
Or preferably, " mouth " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, it is 0 ~ 1 that " mouth " heat-transfer surface top has the scope that gas-solid flow outlet 3, open height h and suspention heat exchange shield the ratio h/H of height H.
Further, the opening on " mouth " heat-transfer surface top is towards wall after burner hearth, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
Layout " Contraband " shape in burner hearth, " mouth " shape suspention screen represent furnace depth or width apart from the distance b≤1/2W, W of boiler furnace front wall.
Further again, the arrangement of single-group type suspention screen in burner hearth is that one chip and " Contraband " shape interval that interlocks is arranged, or one chip and " mouth " shape interval that interlocks is arranged, or " Contraband " shape and " mouth " shape interval that interlocks is arranged, or one chip, " Contraband " shape, the staggered interval of " Contraband " shape three kinds are arranged.
Suspention heat exchange screen basic structure of the present invention is " Contraband " shape or " mouth " shape, as shown in Figure 2, screen is suspended in midair around forming single-group type by the suspension type pendant superheater of 3 or 4 one chips, suspention screen sheet 1 is made up of pipe and fin, the round connecting to form " Contraband " shape or " mouth " shape by fin between screen sheet and screen sheet suspends heat exchange in midair and shields, and 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, adjacent two panels be coupled together at a certain distance with fin.Compared with suspending screen in midair with former conventional " Shu " shape, the two can increase screen sheet intensity, makes it be in operation and not easily produces distortion.
" Contraband " shape of the present invention or " mouth " shape suspention heat exchange are shielded in structure, can on its heat-transfer surface top to offer the gas-solid flow outlet of suitable size around pipe group form, as shown in Figure 4, the gas-solid flow flowed through in " Contraband " shape or " mouth " shape suspention heat exchange screen is flowed out from this outlet.The scope that the ratio h/H of height H is shielded in height h and the suspention heat exchange of outlet is 0 ~ 1.Outlet towards general towards separator inlet direction, also can towards wall after burner hearth, or front wall, or left and right side wall.
As shown in Figure 3, " Contraband " shape, " mouth " shape and " Shu " shape can be arranged in burner hearth at interval the arrangement form of the present invention in recirculating fluidized bed burner hearth.Namely all can be arranged as a kind of structure in first two structure, also can two kinds of structures alternately arrange, or arrange interspersed for monolithic/group suspention screen with first two scheme." Contraband " shape, " mouth " shape suspention screen represent furnace depth or width (Fig. 3) apart from the distance b≤1/2W, W of boiler furnace front wall.
As can be seen from Figure 5, compared with suspending heating screen in midair with non-round, " Contraband " shape or " mouth " shape suspention heating screen can arrange more heating surface in the same space of boiler hearth of circulating fluidized bed, the space in burner hearth can be utilized better, and the average effective distance of shielding between screen increases, eliminate because shielding the too small and subsides screen-wall particle aggregation that causes of spacing and the too small phenomenon of speed.The particle decrease speed in such subsides wall-cooling surface 2 and suspention screen-wall face 1 can comparatively before increase, eliminate and the disadvantageous negative factor of heat absorbed to heating surface, make its large-size circulating fluidized bed burner hearth gas-solid flow bulk properties rule of more coincideing, improve heat transfer efficiency.
As can be seen from basic structure of the present invention, " Contraband " shape or " mouth " shape suspention heating screen can increase to some extent at width, and namely short transverse can reduce to some extent.Such difference in height that can reduce monolithic screen, shortens the working medium flow in single cell, can avoid the generation of superheating phenomenon thus, extends the service life of screen.
Content described in this description embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention also and conceive the equivalent technologies means that can expect according to the present invention in those skilled in the art.
Claims (8)
1. boiler hearth of circulating fluidized bed round suspention heat exchange screen, comprise the screen sheet of suspension type pendant superheater, reheater, water-cooling screen, it is characterized in that: the screen sheet of described suspension type pendant superheater is made up of the pipe of the heating agent that circulates and fin, the screen sheet of some described suspension type pendant superheaters encloses the single-group type suspention screen of round or half round, and between the screen sheet of described suspension type pendant superheater, full connection or part connect; Described suspention screen is straight-through tube panel from bottom to top, and the top area of suspention screen is open state; Suspention screen is suspended in boiler hearth of circulating fluidized bed top, and the heat-transfer surface top of suspention screen has gas-solid flow outlet; Suspention screen is the two-sided panel that is heated, and all there is Gas-solid Two-phase Flow its panel both sides.
2. heat exchange screen as claimed in claim 1, is characterized in that: the single-group type suspention screen of half described 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 screen as claimed in claim 2, is characterized in that: " Contraband " shape single-group type suspention screen is suspended in boiler hearth of circulating fluidized bed top, and " Contraband " shape opening direction is towards 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 screen as claimed in claim 3, 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 scope that the ratio h/H of height H is shielded in open height h and the suspention heat exchange of gas-solid flow outlet (3) is 0 ~ 1.
5. heat exchange screen as claimed in claim 2, 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 the scope that open height h shields the ratio h/H of height H with suspention heat exchange is 0 ~ 1.
6. heat exchange screen as claimed in claim 5, is characterized in that: the opening on " mouth " heat-transfer surface top is towards wall after burner hearth, or front wall, or left and right side wall, or the peripheral water-cooling wall of burner hearth.
7. the heat exchange screen as described in one of claim 1-6, is characterized in that: layout " Contraband " shape in burner hearth, " mouth " shape suspention screen represent furnace depth or width apart from the distance b≤1/2W, W of boiler furnace front wall.
8. heat exchange screen as claimed in claim 7, it is characterized in that: the arrangement of single-group type suspention screen in burner hearth is that one chip and " Contraband " shape interval that interlocks is arranged, or one chip and " mouth " shape interval that interlocks is arranged, or " Contraband " shape and " mouth " shape interval that interlocks is arranged, or one chip, " Contraband " shape, the staggered interval of " Contraband " shape three kinds are arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310142880.1A CN103175197B (en) | 2013-04-22 | 2013-04-22 | Boiler hearth of circulating fluidized bed round suspention heat exchange screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310142880.1A CN103175197B (en) | 2013-04-22 | 2013-04-22 | Boiler hearth of circulating fluidized bed round suspention heat exchange screen |
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| CN103175197A CN103175197A (en) | 2013-06-26 |
| CN103175197B true CN103175197B (en) | 2015-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310142880.1A Expired - Fee Related CN103175197B (en) | 2013-04-22 | 2013-04-22 | Boiler hearth of circulating fluidized bed round suspention heat exchange screen |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105698165B (en) * | 2016-04-15 | 2018-03-13 | 东方电气集团东方锅炉股份有限公司 | A kind of chamber structure of CFBB |
| CN106122936A (en) * | 2016-08-17 | 2016-11-16 | 华电电力科学研究院 | Curved S type pendant superheater |
| CN106122937A (en) * | 2016-08-17 | 2016-11-16 | 华电电力科学研究院 | CFBB suspension curved S type curtain wall |
| CN106224945A (en) * | 2016-08-30 | 2016-12-14 | 华电电力科学研究院 | Supercritical circulating fluidized bed boiler hearth square waveform mid-board |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101240893A (en) * | 2007-02-07 | 2008-08-13 | 中国科学院工程热物理研究所 | Circulating fluid bed boiler furnace possessing heating screen |
| CN202371705U (en) * | 2011-11-10 | 2012-08-08 | 哈尔滨锅炉厂有限责任公司 | Reinforcing device for heating surface of large circulating fluidized bed boiler |
| CN202484967U (en) * | 2012-02-14 | 2012-10-10 | 清华大学 | Furnace chamber heating surface of supercritical boiler |
| CN203286556U (en) * | 2013-04-22 | 2013-11-13 | 浙江大学 | Circular suspended heat exchange screen of circulating fluidized bed boiler |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009198065A (en) * | 2008-02-20 | 2009-09-03 | Mitsubishi Heavy Ind Ltd | Circulating fluidized bed boiler |
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2013
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101240893A (en) * | 2007-02-07 | 2008-08-13 | 中国科学院工程热物理研究所 | Circulating fluid bed boiler furnace possessing heating screen |
| CN202371705U (en) * | 2011-11-10 | 2012-08-08 | 哈尔滨锅炉厂有限责任公司 | Reinforcing device for heating surface of large circulating fluidized bed boiler |
| CN202484967U (en) * | 2012-02-14 | 2012-10-10 | 清华大学 | Furnace chamber heating surface of supercritical boiler |
| CN203286556U (en) * | 2013-04-22 | 2013-11-13 | 浙江大学 | Circular suspended heat exchange screen of circulating fluidized bed boiler |
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Granted publication date: 20151118 |