CN106678785A - Lubricating air device for preventing coking of external bed of CFB boiler at high temperature - Google Patents
Lubricating air device for preventing coking of external bed of CFB boiler at high temperature Download PDFInfo
- Publication number
- CN106678785A CN106678785A CN201710082854.2A CN201710082854A CN106678785A CN 106678785 A CN106678785 A CN 106678785A CN 201710082854 A CN201710082854 A CN 201710082854A CN 106678785 A CN106678785 A CN 106678785A
- Authority
- CN
- China
- Prior art keywords
- lubrication
- external bed
- airduct
- standpipe
- side wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
- F23C2206/103—Cooling recirculating particles
Abstract
The invention discloses a lubricating air device for preventing coking of an external bed of a CFB boiler at the high temperature. The lubricating air device comprises an electric regulating valve, an upper manual regulating valve, a lower manual regulating valve, a vertical pipe lubricating air pipe and a side wall lubricating air pipe; the electric regulating valve, the upper manual regulating valve and the lower manual regulating valve control the flow and a pressure head of lubricating air; the vertical pipe lubricating air pipe is installed around a vertical pipe, and branch pipes are arranged at equal intervals; branch pipes on the side wall lubricating air pipe are arranged in a side wall and a partition wall of an external bed shell; and the structures jointly form the lubricating air device, and the lubricating air device can operate intermittently or continuously. According to the lubricating air device, the material returning amount of circulating ash of the vertical pipe and the external bed is effectively controlled, and the problem of coking of the external bed of the CFB boiler at the high temperature is solved, so that the effect that the external bed operates safely and reliably is ensured.
Description
Technical field
The present invention relates to recirculating fluidized bed (CFB) boiler technical field of power generation, more particularly to one kind prevents CFB boiler external
The lubrication wind apparatus of bed high-temperature coking.
Background technology
With the fast development of CFB boiler the Enlargement Tendency, the problem not enough in order to make up heating surface, external bed turns into big
The essential equipment of type CFB boiler.Generally it is disposed with 4~6 external heat exchangers outside CFB boiler stove, abbreviation external bed, outward
Put bed to be typically made up of 5 air compartments, respectively distributor chamber, high temperature recycling room, equal flow chamber, Heat Room and low temperature feed back room.Distribution
Room, high temperature recycling room, equal flow chamber be high-temperature area, temperature between 800~1000 DEG C, Heat Room be disposed with high temperature reheater or
Person's low temperature superheater, low temperature feed back room temperature is between 400~600 DEG C.Traditional external bed is only arranged in each air compartment bottom
Air distribution plate and blast cap, other are again without air intake.When boiler runs into ash coal kind, circulating ash quantity increases, and causes high temperature recycling room
Grey mobility is deteriorated, so as to trigger coking.Li Kezhang etc. exists《The analysis of 300MW CFBB dipleg cokings》Point out material
Coking is almost blocked leg (standpipe) causes blowing out；What illumination etc. exists《300MW CFBB outer circulation feed back abnormal causes
Analysis》In it has also been found that hardened thing is the reason for causing CFBB outer circulation feed back abnormal in external bed.Currently, it is large-scale
External bed for circulating fluidized bed boiler is only provided with outside air distribution plate in bottom, lubricating facility without other circulating ash, external bed and vertical
There is circulating ash flowing inequality, coking problem occur in pipe.
The content of the invention
In order to overcome the defect of above-mentioned prior art, CFB boiler external bed is prevented it is an object of the invention to provide one kind
The lubrication wind apparatus of high-temperature coking, to solve the not smooth even coking problem of external bed blanking in the prior art.
In order to achieve the above object, the present invention is adopted the following technical scheme that：
It is a kind of to prevent the lubrication wind apparatus of CFB boiler external bed high-temperature coking, including it is arranged on the electricity in lubrication wind main pipe
Dynamic regulating valve 1, be arranged on the upper manual modulation valve 2 that on lubrication wind main pipe branch road is connected and is in parallel with electric control valve 1 and under
Manual modulation valve 5, airduct 4 is lubricated with multi-turn standpipe of the connect setting of upper manual modulation valve 2 on the branch road of lubrication wind main pipe one, with
Side wall of the lower connect setting of manual modulation valve 5 on lubrication another branch road of wind main pipe lubricates airduct 6；The multi-turn standpipe lubricates wind
Pipe 4 arranges there is multiple branch pipes, side wall profit on the multi-turn standpipe lubrication airduct 4 and side wall lubrication airduct 6 around external bed standpipe
The branch pipe of sliding airduct 6 is arranged in the side wall of external bed housing 11 and partition wall 8, and branch pipe shower nozzle is stretched into distributor chamber 7.
It is described lubrication wind apparatus can intermittently operated and continuous operation, by electric control valve 1 and upper manual modulation valve 2
Control the flow and pressure head of lubrication wind respectively with lower manual modulation valve 5.
Branch pipe on standpipe lubrication airduct 4 and side wall lubrication airduct 6 selects ZGCr25Ni20 heat-resisting steels, have 30~
60 ° are angled downward.
The standpipe lubrication airduct 4 is enclosed at least about standpipe arrangement two, is often equally spaced 4~8 branch pipes on circle.
The shower nozzle of the side wall lubrication branch pipe of airduct 6 stretches into the of length no more than 20mm in distributor chamber 7.
It is described lubrication wind apparatus slagging prevention method be：Lubrication wind flow is controlled by electric control valve 1, then by upper
The pressure head of manual modulation valve 2 and lower manual modulation valve 5 control lubrication wind so that the pressure difference of external bed is just and temperature is no more than
900℃；About 900 DEG C of high temperature ash feeds from the ash inlet 3 of separator standpipe, and lubrication wind lubricates airduct 4 and side wall profit from standpipe
Sliding airduct 6 is sprayed into, and airflow layer is formed on the surface of external bed housing 11, and high temperature ash is lubricated prevents high temperature ash coking, is entered
Enter the ash of the high temperature in external bed distributor chamber 7 to climb over partition wall 8 in bubbling state in external bed and transfer heat to heat exchanger 10,
Temperature is reduced to 400~600 DEG C, is discharged from ash hole 9.
Beneficial effects of the present invention：
1) present invention prevents the lubrication wind apparatus of CFB boiler external bed high-temperature coking, can be many according to boiler circulating ash quantity
It is few intermittently or serially to put into.
2) present invention prevents the lubrication wind apparatus of CFB boiler external bed high-temperature coking, wind regime from using hp fluid air, system
Simply, reliable and stable, cost of investment is low.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
Wherein：1- electric control valves, the upper manual modulation valves of 2-, 3- ash inlets, 4- standpipes lubrication airduct is adjusted manually under 5-
Valve, 6- side walls lubrication airduct, 7- external bed distributor chambers, 8- partition walls, 9- ash holes, 10- heat exchangers, 11- external bed housings, 12-
Blast cap.
Specific embodiment
The invention will now be described in detail with reference to the accompanying drawings：
As shown in figure 1, the present invention includes electric control valve 1, upper manual modulation valve 2, ash inlet 3, standpipe lubricates airduct 4,
Lower manual modulation valve 5, side wall lubrication airduct 6, external bed distributor chamber 7, partition wall 8, ash hole 9, heat exchanger 10, external bed housing
11, blast cap 12.Being arranged in external bed housing 11 has partition wall 8, heat exchanger 10, blast cap 12.Lubrication wind is logical through electric control valve 1
Enter, standpipe lubrication airduct 4 and side wall lubrication airduct 6 are each led into by upper manual modulation valve 2 and lower manual modulation valve 5, pass through
The flow and pressure head of electric control valve 1, upper manual modulation valve 2 and lower manual modulation valve 5 control lubrication wind so that the pressure of external bed
Difference is just to be no more than 900 DEG C with temperature.The present embodiment standpipe lubricates standpipe of the airduct 4 around the lower section of ash inlet 3 and is disposed with two circles,
Downward-sloping 45 ° of six branch pipes are often arranged symmetrically on circle.The branch pipe of the side wall lubrication connection of airduct 6 is arranged in the side wall of housing 11
And on partition wall 8, branch tube head is inserted into distributor chamber 7, insertion depth is no more than 20mm, and ZGCr25Ni20 is resistance to for branch pipe material selection
Hot steel.About 900 DEG C of high temperature ash feeds from the ash inlet 3 of separator standpipe, and lubrication wind lubricates airduct 4 and side wall profit from standpipe
Sliding airduct 6 is sprayed into, and airflow layer is formed on the surface of external bed housing 11, and high temperature ash is lubricated prevents high temperature ash coking, is entered
Enter the ash of the high temperature in external bed distributor chamber 7 to climb over partition wall 8 in bubbling state in external bed and transfer heat to heat exchanger 10,
Temperature is reduced to 400~600 DEG C, is discharged from ash hole 9.
Claims (6)
1. a kind of lubrication wind apparatus for preventing CFB boiler external bed high-temperature coking, it is characterised in that：It is female including being arranged on lubrication wind
Electric control valve (1) on pipe, is arranged on be connected and be in parallel with electric control valve (1) on lubrication wind main pipe branch road upper manual
Regulating valve (2) and lower manual modulation valve (5) are more on the branch road of lubrication wind main pipe one with upper manual modulation valve (2) connect setting
Circle standpipe lubricates airduct (4), and wind is lubricated with side wall of lower manual modulation valve (5) connect setting on lubrication another branch road of wind main pipe
Pipe (6)；The multi-turn standpipe lubricates airduct (4) and is arranged around external bed standpipe, and the multi-turn standpipe lubricates airduct (4) and side wall
The branch pipe for having many Heavenly Stems and Earthly Branches pipes, side wall lubrication airduct (6) in lubrication airduct (6) is arranged in the side wall and partition wall of external bed housing (11)
(8) in, branch pipe shower nozzle is stretched into distributor chamber (7).
2. a kind of lubrication wind apparatus for preventing CFB boiler external bed high-temperature coking according to claim 1, its feature exists
In：It is described lubrication wind apparatus can intermittently operated and continuous operation, by electric control valve (1) and upper manual modulation valve (2)
Control the flow and pressure head of pressure-air respectively with lower manual modulation valve (5).
3. a kind of lubrication wind apparatus for preventing CFB boiler external bed high-temperature coking according to claim 1, its feature exists
In：The standpipe lubricates branch pipe that airduct (4) and side wall lubricated on airduct (6) from ZGCr25Ni20 heat-resisting steels, have 30~
60 ° are angled downward.
4. a kind of lubrication wind apparatus for preventing CFB boiler external bed high-temperature coking according to claim 1, its feature exists
In：The standpipe lubricates airduct (4) and is enclosed at least about standpipe arrangement two, is often equally spaced 4~8 branch pipes on circle.
5. a kind of lubrication wind apparatus for preventing CFB boiler external bed high-temperature coking according to claim 1, its feature exists
In：The shower nozzle of described side wall lubrication airduct (6) branch pipe stretches into the of length no more than 20mm in distributor chamber (7).
6. a kind of lubrication wind apparatus for preventing CFB boiler external bed high-temperature coking according to claim 1, its feature exists
In：It is described lubrication wind apparatus slagging prevention method be：Lubrication wind flow is controlled by electric control valve (1), then by left-hand seat
The pressure head of dynamic regulating valve (2) and lower manual modulation valve (5) control lubrication wind so that the pressure difference of external bed is just and temperature is no more than
900℃；About 900 DEG C of high temperature ash feeds from the ash inlet (3) of separator standpipe, and lubrication wind lubricates airduct (4) and side from standpipe
Wall lubricates airduct (6) and sprays into, and airflow layer is formed on external bed housing (11) surface, and high temperature ash is lubricated prevents high temperature grey
Coking, partition wall (8) is climbed over by heat transfer into the high temperature ash in external bed distributor chamber (7) in external bed in bubbling state
Heat exchanger (10) is given, temperature is reduced to 400~600 DEG C, from ash hole (9) discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710082854.2A CN106678785B (en) | 2017-02-16 | 2017-02-16 | Prevent the lubrication wind apparatus of CFB boiler external bed high-temperature coking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710082854.2A CN106678785B (en) | 2017-02-16 | 2017-02-16 | Prevent the lubrication wind apparatus of CFB boiler external bed high-temperature coking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106678785A true CN106678785A (en) | 2017-05-17 |
| CN106678785B CN106678785B (en) | 2019-03-26 |
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ID=58861914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710082854.2A Active CN106678785B (en) | 2017-02-16 | 2017-02-16 | Prevent the lubrication wind apparatus of CFB boiler external bed high-temperature coking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106678785B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294652A (en) * | 2021-12-16 | 2022-04-08 | 合肥工业大学 | Be used for discarded object broken combustion processing apparatus |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0517495A3 (en) * | 1991-06-03 | 1993-03-03 | Foster Wheeler Energy Corporation | Fluidized bed combustion method utilizing fine and coarse absorbent feed |
| CN101629717A (en) * | 2009-05-26 | 2010-01-20 | 西安热工研究院有限公司 | Current-equalizing pneumatic heat exchanging bed |
| CN202613429U (en) * | 2012-03-20 | 2012-12-19 | 广东电网公司电力科学研究院 | Biomass circulating fluidized bed direct-burning device |
| CN103216825A (en) * | 2012-01-20 | 2013-07-24 | 中国科学院工程热物理研究所 | Circular-arc-shaped U valve material returning device for high-density circulating fluidized bed utilizing B-class particle |
| CN203656914U (en) * | 2013-12-17 | 2014-06-18 | 东方电气集团东方锅炉股份有限公司 | External heat exchanger |
| US20160377351A1 (en) * | 2015-06-29 | 2016-12-29 | Korea Electric Power Corporation | Heat exchange apparatus for circulating fluidized bed boilers |
| CN206582837U (en) * | 2017-02-16 | 2017-10-24 | 中国华能集团清洁能源技术研究院有限公司 | It is a kind of to prevent the lubrication wind apparatus of CFB boiler external bed high-temperature coking |
-
2017
- 2017-02-16 CN CN201710082854.2A patent/CN106678785B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0517495A3 (en) * | 1991-06-03 | 1993-03-03 | Foster Wheeler Energy Corporation | Fluidized bed combustion method utilizing fine and coarse absorbent feed |
| CN101629717A (en) * | 2009-05-26 | 2010-01-20 | 西安热工研究院有限公司 | Current-equalizing pneumatic heat exchanging bed |
| CN103216825A (en) * | 2012-01-20 | 2013-07-24 | 中国科学院工程热物理研究所 | Circular-arc-shaped U valve material returning device for high-density circulating fluidized bed utilizing B-class particle |
| CN202613429U (en) * | 2012-03-20 | 2012-12-19 | 广东电网公司电力科学研究院 | Biomass circulating fluidized bed direct-burning device |
| CN203656914U (en) * | 2013-12-17 | 2014-06-18 | 东方电气集团东方锅炉股份有限公司 | External heat exchanger |
| US20160377351A1 (en) * | 2015-06-29 | 2016-12-29 | Korea Electric Power Corporation | Heat exchange apparatus for circulating fluidized bed boilers |
| CN206582837U (en) * | 2017-02-16 | 2017-10-24 | 中国华能集团清洁能源技术研究院有限公司 | It is a kind of to prevent the lubrication wind apparatus of CFB boiler external bed high-temperature coking |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294652A (en) * | 2021-12-16 | 2022-04-08 | 合肥工业大学 | Be used for discarded object broken combustion processing apparatus |
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| Publication number | Publication date |
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| CN106678785B (en) | 2019-03-26 |
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