CN1312431C - Sealed fluid back-feeder - Google Patents
Sealed fluid back-feeder Download PDFInfo
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- CN1312431C CN1312431C CNB2004100611001A CN200410061100A CN1312431C CN 1312431 C CN1312431 C CN 1312431C CN B2004100611001 A CNB2004100611001 A CN B2004100611001A CN 200410061100 A CN200410061100 A CN 200410061100A CN 1312431 C CN1312431 C CN 1312431C
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- moving bed
- air distribution
- distribution plate
- bed
- fluid bed
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- Crucibles And Fluidized-Bed Furnaces (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The present invention discloses a fluidized and sealed material return device which has the structural characteristics that the middle part and the lower part of the inner surface of a back wall of a moving bed relative to a baffle plate incline towards the direction of the baffle plate. An angle between the inclined plane of the moving bed and a grid plate is greater than a static angle of circulating materials and is smaller than 90 DEG. The effective area of the moving bed is smaller than the effective area of a fluidized bed; a directional wind cap is installed on the grid plate of the moving bed; the directional wind cap is at least provided with a hole within the range of 90 to 160 DEG for facing the fluidized bed. A single wind chamber is arranged below the grid plate; the periphery of the wind chamber is sealed with the grid plate. The material return device does not generate the phenomena of operation stagnation, slag coagulation during high temperature, furnace gas tamper to a separator, etc. The present invention enhances running stability and reliability, and has the advantages of simple structure and convenient manufacture and installation. The present invention as the material return device of the circulating materials is especially suitable for circulating fluidized bed boilers with small vertical pipe height, gasification furnaces and industrial furnaces.
Description
Technical field
The present invention relates to a kind of material-returning device in the circulating fluidized bed system.
Background technology
Combustion technology of circulating fluidized has become the important content that China's present stage clean coal utilizes technology.CFBC is carried out the low-temperature reinforcement burning, can use the industry and the solid waste etc. of living such as living beings, rubbish such as various coals, straw, shell, forest industry waste material, can in stove, add simultaneously desulfurizing agents such as lime stone, realize efficient, the economic desulfurization of combustion process, thereby have outstanding advantages such as fuel tolerance is wide, efficiency of combustion is high, pollutant emission is low.CFBB mainly is made up of fire box, separator, material returning device and back-end ductwork etc., the main effect of material returning device is the flying dust that separator separates to be sent into burner hearth fire again, to improve the efficiency of combustion of boiler, has sealing function simultaneously, avoid the burner hearth flue gas to return and scurry separator, and provide regulating measure for the boiler variable load operation by the flying dust closed circuit.
At present, using more material-returning device on the CFBB is the fluidisation sealing material returning device of the automatic adjusting type of non-mechanical type, and its moving bed and fluidized bed area are suitable, and air quantity and cloth wind mode are too.Though the fluidisation of this routine sealing material returning device can adapt to the needs of load variations automatically, does not need artificial adjusting, and is also low than another kind of valve type material-returning device to the requirement for height of stock column head.But practice shows, can occur operation during this material returning device is applied on the low capacity CFBB and stagnate, thus when high temperature slagging scorification and burner hearth flue gas anti-channeling separator, cause problems such as fluctuation of service.The structure of this conventional fluidisation sealing material-returning device introduced in " Jilin electric power " the 5th phase in 2000 " L valve and loop seal in the CFBB material return system " literary composition (pp.21-24).
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art part, a kind of fluidisation sealing material-returning device is provided.This material-returning device has improved stability and the reliability of operation, and simple in structure, make easy for installation.
For achieving the above object, the technical solution used in the present invention is: a kind of fluidisation sealing material-returning device, and its bottom surface is an air distribution plate, and dividing plate is housed between two lateral walls, dividing plate and two side and end face joint all seal, and leave the slit between the air distribution plate, have ash discharging hole on air distribution plate, a side of dividing plate is a moving bed, opposite side is a fluid bed, end face at moving bed has material inlet, has material outlet at the sidewall of fluid bed, on the air distribution plate of fluid bed blast cap is installed; The inner surface middle and lower part of the rear wall that moving bed is relative with dividing plate tilts to the dividing plate direction, and the angle between its inclined-plane and the air distribution plate is greater than the angle of repose of recycle stock and less than 90 °; The effective area of moving bed is less than the effective area of fluid bed; On the air distribution plate of moving bed wind cap is installed, wind cap is having a hole at least in 90～160 ° of scopes of fluid bed, and the number of wind cap is less than the number of blast cap; Air compartment is set below air distribution plate, seals with air distribution plate around it.
The present invention compared with prior art has the following advantages:
(1) inner surface of moving bed rear wall is designed to the inclined-plane, and the wind cap of negligible amounts has been installed, the material that assurance falls into from material inlet can not form at moving bed to be piled up and stagnation, can enter fluid bed rapidly, avoid under high-temperature condition, the slagging scorification that material is possible has improved the stability and the reliability of operation.
(2) effective area of moving bed is less than the effective area of fluid bed, makes wind from air compartment reasonably two distribution, realized the little air quantity of moving bed and the big air quantity air feed of fluid bed, thereby it is smooth and easy to guarantee that circulating ash flows in material-returning device.
(3) on the air distribution plate of moving bed, wind cap is installed, is guaranteed that the material moving bed is to fluid bed orientation, smooth and easy flowing.
(4) adopt single air compartment, rather than common double-wind chamber, thereby simple in structure, make easy for installationly, air quantity is regulated and is also become simple.
Description of drawings
Fig. 1 is the structure diagram of an embodiment of the present invention.
Fig. 2 is the A-A profile of Fig. 1.
Fig. 3 is the structure diagram of a kind of embodiment of wind cap among Fig. 1.
Fig. 4 is the B-B profile of Fig. 3.
The specific embodiment
By Fig. 1～shown in Figure 4,1-material inlet 1,2-end face, 3-rear wall, 4-moving bed, 5-dividing plate, the 6-ash discharging hole, 7-air compartment, 8-air distribution plate, 9-material outlet, 10-fluid bed, the 11-wind cap, 12-slit, 13-blast cap, 14, the 15-two lateral walls, the aperture on the 16-wind cap.
By Fig. 1, shown in Figure 2, bottom surface of the present invention is an air distribution plate 8, the weight of bogey itself, heat resisting steel dividing plate 5 is housed between two lateral walls 14 and 15, and dividing plate 5 is welded on two side 14 and 15, and the flame retardant coating of end face 2 can be stretched in the upper end, dividing plate 5 is sealing with two side 14,15 and end face 2 joints, leave slit 12 between lower end and the air distribution plate 8, dividing plate plays sealing function, and the flue gas anti-channeling is to separator when avoiding the furnace pressure fluctuation.On air distribution plate 8, have ash discharging hole 6, ash discharging hole 6 ash pipe that runs in.One side of dividing plate 5 is a moving bed 4, and opposite side is a fluid bed 10.Have material inlet 1 on the end face 2 of moving bed 4, material inlet 1 connects standpipe, has material outlet 9 at the sidewall of fluid bed 10, and material outlet 9 connects refeed line.The inner surface middle and lower part of the rear wall 3 that moving bed 4 and dividing plate 5 are relative tilts to dividing plate 5 directions, the angle [alpha] between inclined-plane and the air distribution plate 8 greater than the angle of repose of recycle stock and in less than 90 ° scope all can, for example, among Fig. 1, angle α can be 60 °.The effective area of moving bed 4 is less than the effective area of fluid bed 10.On the air distribution plate 8 of moving bed 4, three wind caps 11 can be installed, directed with the importing of the material in the moving bed 4 fluid bed 10, the column type blast cap 13 of nine routines can be installed on the air distribution plate 8 of fluid bed 10, be used for even distributing wind, guarantee no fluidisation dead angle, thereby make particle enter refeed line from fluid bed 10 swimmingly.The number of wind cap 11 is less than the number of blast cap 13, can guarantee the big air quantity of fluid bed and the less air quantity air feed of moving bed.Air compartment 7 is set below air distribution plate 8, and air compartment 7 can be welded on the air distribution plate 8, seals with air distribution plate 8 around it.The cross-sectional area of air compartment 7 is equal to or greater than the effective area sum of moving bed 2 and fluid bed 10, thereby guarantees that each blast cap all has the wind supply.
Wind cap 11 is having a hole 16 at least in 90～160 ° of scopes of fluid bed 10.For example, by Fig. 3, shown in Figure 4, wind cap 11 has nine holes 16 in the β towards fluid bed 10 can be 120 ° scope, and such aperture has nine, divides three rows, three of every rows.
On device, also can have hand hole, be used for inspecting wind cap 11 and blast cap 13, and remove the block that falls into device where necessary.
The outer surface of device can be coated by steel plate, and liner heat-barrier material and refractory material are formed.
The recycle stock (flying dust) that is separated by separator is by standpipe, enters moving bed 4 under himself gravity promotes.Simultaneously, loosening wind also enters moving bed 4 through air compartment 7, air distribution plate 8 and wind cap 11, and fluidized wind enters fluid bed 10 through air compartment 7, air distribution plate 8 and blast cap 13.During inflation, material in the standpipe forms the stock column head, in moving bed 4, cause the pressure that is higher than burner hearth, under this pressure effect, material in the moving bed 4 by slit 12, enters fluid bed 10 through the loosening wind water conservancy diversion that wind cap 11 provides, big air quantity in the fluid bed 10 rapidly with mass transport to refeed line, send burner hearth at last back to.When stopping transport, material can be got rid of by ash releasing tube 6.
The present invention is specially adapted to the less CFBB of standpipe height, gasification furnace and Industrial Stoves as the material-returning device of recycle stock.
Claims (2)
1. a fluidisation seals material-returning device, its bottom surface is an air distribution plate 8), dividing plate (5) is housed between two lateral walls (14) (15), dividing plate (5) all seals with two side (14) (15) and end face (2) joint, and leave slit (12) between the air distribution plate (8), on air distribution plate (8), have ash discharging hole (6), one side of dividing plate (5) is moving bed (4), opposite side is fluid bed (10), end face (2) in moving bed (4) has material inlet (1), sidewall at fluid bed (10) has material outlet (9), goes up at the air distribution plate (8) of fluid bed (10) blast cap (13) is installed, and it is characterized in that:
The inner surface middle and lower part of the rear wall (3) that moving bed (4) is relative with dividing plate (5) tilts to dividing plate (5) direction, and the angle between its inclined-plane and the air distribution plate (8) is greater than the angle of repose of recycle stock and less than 90 °;
The effective area of moving bed (4) is less than the effective area of fluid bed (10);
Go up installation wind cap (11) at the air distribution plate (8) of moving bed (4), wind cap (11) is having a hole (16) at least in 90～160 ° of scopes of fluid bed (10), and the number of wind cap (11) is less than the number of blast cap (13);
Air compartment (7) is set below air distribution plate (8), seals with air distribution plate (8) around it.
2. fluidisation sealing material-returning device according to claim 1, it is characterized in that: the cross-sectional area of above-mentioned air compartment (7) is equal to or greater than the effective area sum of moving bed (4) and fluid bed (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100611001A CN1312431C (en) | 2004-11-11 | 2004-11-11 | Sealed fluid back-feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100611001A CN1312431C (en) | 2004-11-11 | 2004-11-11 | Sealed fluid back-feeder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1614306A CN1614306A (en) | 2005-05-11 |
| CN1312431C true CN1312431C (en) | 2007-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100611001A Expired - Fee Related CN1312431C (en) | 2004-11-11 | 2004-11-11 | Sealed fluid back-feeder |
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| Country | Link |
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| CN (1) | CN1312431C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563633B (en) * | 2010-12-31 | 2015-07-01 | 贵州中烟工业有限责任公司 | Material return device for circulating fluidized bed boiler |
| CN103216825B (en) * | 2012-01-20 | 2015-12-16 | 中国科学院工程热物理研究所 | Use the High-density Circulating Fluidized Beds circular arc U valve material returning device of category-B particle |
| CN103591577A (en) * | 2013-11-21 | 2014-02-19 | 江苏中容环保有限公司 | Method for mechanical-non-mechanical coupling control of pressure balance of dual-cycle fluid bed |
| CN105066120A (en) * | 2015-09-17 | 2015-11-18 | 安徽海螺川崎节能设备制造有限公司 | Material returning device of circulating fluidized bed boiler |
| CN105299637A (en) * | 2015-11-15 | 2016-02-03 | 国网山西省电力公司电力科学研究院 | Efficient separation return feeder of circulating fluidized boiler |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2285422Y (en) * | 1996-10-17 | 1998-07-01 | 姜秀民 | U-shaped material-backfeeding valve |
| CN2593064Y (en) * | 2002-12-17 | 2003-12-17 | 重庆市节能技术服务中心 | Boiler primary air pressurized dense-phase zone charge returning apparatus |
| CN2608843Y (en) * | 2003-04-08 | 2004-03-31 | 东南大学 | Back material controller of flying ash bottom feed circulating fluidized bed |
| CN2747467Y (en) * | 2004-11-11 | 2005-12-21 | 华中科技大学 | Fluidised sealed material return device |
-
2004
- 2004-11-11 CN CNB2004100611001A patent/CN1312431C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2285422Y (en) * | 1996-10-17 | 1998-07-01 | 姜秀民 | U-shaped material-backfeeding valve |
| CN2593064Y (en) * | 2002-12-17 | 2003-12-17 | 重庆市节能技术服务中心 | Boiler primary air pressurized dense-phase zone charge returning apparatus |
| CN2608843Y (en) * | 2003-04-08 | 2004-03-31 | 东南大学 | Back material controller of flying ash bottom feed circulating fluidized bed |
| CN2747467Y (en) * | 2004-11-11 | 2005-12-21 | 华中科技大学 | Fluidised sealed material return device |
Non-Patent Citations (1)
| Title |
|---|
| 循环流化床锅炉U型返料器的运行特性分析 王正星，机械管理开发，第2期 2001 * |
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| Publication number | Publication date |
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| CN1614306A (en) | 2005-05-11 |
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