CN108397767A - A kind of circulating fluidized bed boiler sunken bed forces down air quantity burning operation method - Google Patents
A kind of circulating fluidized bed boiler sunken bed forces down air quantity burning operation method Download PDFInfo
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- CN108397767A CN108397767A CN201810182448.8A CN201810182448A CN108397767A CN 108397767 A CN108397767 A CN 108397767A CN 201810182448 A CN201810182448 A CN 201810182448A CN 108397767 A CN108397767 A CN 108397767A
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- China
- Prior art keywords
- operation method
- circulating fluidized
- fluidized bed
- air quantity
- burning operation
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- 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.)
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Classifications
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- 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
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The present invention provides a kind of circulating fluidized bed boiler sunken beds to force down air quantity burning operation method, includes the following steps：Fuel burns by the first oxygen debt combustion zone, the second reduction combustion zone, third burning-out zone successively from bottom to top；The lower furnace portion of the first oxygen debt combustion zone is provided with a wind pipe, and First air enters air distribution plate by a wind pipe, and the bottom material thickness above the air distribution plate is less than 500mm；The bottom material uses the clinker discharged in boiler operatiopn, and the grain size of the clinker is less than 8mm, and combustible content is no more than 5%；In the operational process that burns, control primary air flow is no more than 1.25 times of critical flowing saturation.The present invention reduces the energy consumption of thermal power plant, while can also reduce the abrasion to burner hearth by reducing bed pressure, reducing air quantity.
Description
Technical field
The present invention relates to coal-fired plant boiler equipment technical fields, and in particular to a kind of circulating fluidized bed boiler sunken bed forces down
Air quantity burning operation method.
Background technology
70% or more electricity of China comes from thermal power plant, wherein coal electricity accounting 92%, pneumoelectric accounting 4%.Coal-burning power plant is with coal
As the energy, it converts the chemical energy of coal to mechanical energy, then electric energy is converted mechanical energy by turbine generators.
In recent years, with economic quick increase, the problem that china natural resources consumption is big, waste is big, resource utilization is low is got over
More protrude, shortage of resources has become the serious problems of China's economic development faces, for this purpose, country energetically advocate at present it is energy saving
Emission reduction.Thermal power generation occupies leading position in the power generation pattern in China, reduces the various aspects energy consumption of thermal power generation, and realize
The important channel of energy-saving and emission-reduction.
Invention content
The present invention provides a kind of circulating fluidized bed boiler sunken bed force down air quantity burn operation method, by reduce bed pressure,
Reduce air quantity, reduces the energy consumption of thermal power plant, while the abrasion to burner hearth can also be reduced.
To achieve the above object, the technical scheme is that：
A kind of circulating fluidized bed boiler sunken bed forces down air quantity burning operation method, includes the following steps：
Fuel burns by the first oxygen debt combustion zone, the second reduction combustion zone, third burning-out zone successively from bottom to top；
The lower furnace portion of the first oxygen debt combustion zone is provided with a wind pipe, and First air enters cloth wind by a wind pipe
Plate, the bottom material thickness above the air distribution plate are less than 500mm, and the lower furnace portion of second reduction combustion zone and top are set respectively
It is equipped with lower secondary air duct and upper secondary air duct；The outer end of a wind pipe is connect with primary air fan, lower secondary air duct and
The outer end of upper secondary air duct is connect with lower overfire air fan and upper overfire air fan respectively；
The bottom material uses the clinker discharged in boiler operatiopn, and the grain size of the clinker is less than 8mm, and combustible content is no more than
5%；
In the operational process that burns, control primary air flow is no more than 1.25 times of critical flowing saturation.
Further, a wind pipe gos deep into the inner end of burner hearth and is provided with mushroom-shaped cap, is tilted in the cap
Downwardly and outwardly be equipped with venthole, the internal diameter in the venthole stage casing is less than the internal diameter of leading portion and back segment, and leading portion and stage casing, in
Section is smoothly connected with back segment in oblique line.
Further, the cap outer surface is coated with wear-resisting anti-stick coating.
Further, a wind pipe, lower secondary air duct and upper secondary air duct stretch into 5 ~ 10cm of burner hearth, once
Wind pipeline, lower secondary air duct and upper secondary air duct are in outside burner hearth and close one end is provided with vibrator.
Further, a wind pipe outlet wind pressure minimum >=bed pressure.
Further, the internal diameter in the venthole stage casing is the 1/4 ~ 1/3 of leading portion/back segment internal diameter.
Further, the bottom material thickness is d, and as 250mm ＜ d ＜ 350mm, the aperture of primary air fan is 55 ~ 62%,
As 350mm≤d ＜ 450mm, the aperture of primary air fan is 63 ~ 65%, as 450mm≤d≤500mm, the aperture of primary air fan
It is 66 ~ 70%.
Further, the aperture of the lower overfire air fan is 90 ~ 95%.
Further, the upper secondary air duct is uniformly arranged in the radial direction with four groups along burner hearth, and upper secondary air duct stretches into stove
One end of thorax and the angle that burner hearth tangent line is in 30 ~ 45 °.
Above-described circulating fluidized bed boiler sunken bed forces down air quantity burning operation method, has the following advantages：
（1）Burner hearth is divided into the first oxygen debt combustion zone, the second reduction combustion zone, third burning-out zone, more fuel is made to concentrate on
Second reduction combustion zone 6 burns, the air quantity of First air can be reduced, and avoid First air air quantity reduction cause temperature increase and
Caused coking phenomenon.
（2）Using clinker as bottom material, clinker quality is lighter, and by control grain size, can improve the mobile performance of fuel,
Reduce bed pressure, controls bed temperature.
（3）Through the invention, it can effectively reduce air quantity, reduce bed pressure, reduce the energy consumption of thermal power plant, while reduce primary
The impact of wind and Secondary Air to inboard wall of burner hearth reduces the wear phenomenon in boiler, has preferable popularizing application prospect.
Description of the drawings
Fig. 1 is the main structure diagram of the present invention.
Fig. 2 is the section enlarged structure schematic diagram of cap.
In figure, a wind pipe 1, the first oxygen debt combustion zone 2, lower secondary air duct 3, upper secondary air duct 4, third after-flame
Area 5, the second reduction combustion zone 6, air distribution plate 7, cap 8, venthole 9.
Specific implementation mode
Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention be not limited to it is following
Embodiment.
A kind of circulating fluidized bed boiler sunken bed forces down air quantity burning operation method, includes the following steps：
Fuel passes through the first oxygen debt combustion zone 2, second reduction combustion zone 6 successively from bottom to top, third burning-out zone 5 burns；
The lower furnace portion of first oxygen debt combustion zone 2 is provided with a wind pipe 1, and First air enters air distribution plate 7 by a wind pipe 1,
Bottom material thickness above air distribution plate 7 is less than 500mm, and the lower furnace portion of the second reduction combustion zone 6 and top are respectively arranged with down two
Secondary wind pipeline 3 and upper secondary air duct 4；The outer end of a wind pipe 1 is connect with primary air fan, lower secondary air duct 3 and upper two
The outer end of secondary wind pipeline 4 is connect with lower overfire air fan and upper overfire air fan respectively；Burner hearth is divided into the first oxygen debt combustion zone 2, the
Two reduction combustion zones 6, third burning-out zone 5, make more fuel concentrate on the second reduction combustion zone 6 and burn, can reduce one
The air quantity of secondary wind, and the reduction of First air air quantity is avoided to lead to coking phenomenon caused by temperature raising.
The bottom material of fluidized-bed combustion boiler uses the clinker discharged in boiler operatiopn, and the grain size of clinker is less than 8mm, and combustible contains
Amount is no more than 5%, and clinker quality is lighter, and by controlling grain size, can improve the mobile performance of fuel, reduce bed pressure, control bed
Temperature；In the operational process that burns, control primary air flow is no more than 1.25 times of critical flowing saturation.
Further, to keep First air cloth wind uniform, improve the overall flow of bed material, reduce bed pressure, a wind pipe 1
The inner end for going deep into burner hearth is provided with mushroom-shaped cap 8, is equipped with venthole 9,9 stage casing of venthole in cap 8 outward diagonally downward
Internal diameter be less than the internal diameter of leading portion and back segment, and leading portion is smoothly connected with stage casing, stage casing and back segment in oblique line, mushroom-shaped cap
8 can make slag be flowed downward along cap without will produce accumulation, also avoid being blocked at venthole, and lead to primary air pressure
Increase.In addition, since gas can form in the stage casing of venthole 9 intensive, causes pressure to increase, can make gas with the pressure difference of bed pressure
Jet stream enters in burner hearth, preferably accelerates the flowing of bed material, to reduce bed pressure, the internal diameter in 9 stage casing of venthole be leading portion/after
1/4 ~ 1/3 comparison of section internal diameter is suitable.As a same reason, slag blocks cap 8 in order to prevent, and 8 outer surface of cap is coated with wear-resisting
Anti-stick coating.
Further, a wind pipe 1, lower secondary air duct 3 and upper secondary air duct 4 stretch into 5 ~ 10cm of burner hearth, once
Wind pipeline 1, lower secondary air duct 3 and upper secondary air duct 4 are in outside burner hearth and close one end is provided with vibrator, this shakes
Clogging caused by dynamic device energy slagging prevention or fuel enrichment, further ensuring fluidized-bed combustion boiler can be the low air quantity the case where
Lower stable operation.
Further, a wind pipe 1 exports wind pressure minimum >=bed pressure, to ensure bed material energy steady flow.Together
Sample, to ensure the proper flow of bed material, prevent the temperature of the first oxygen debt combustion zone 2 excessively high, bottom material thickness is d, as 250mm ＜
When d ＜ 350mm, the aperture of primary air fan is 55 ~ 62%, and as 350mm≤d ＜ 450mm, the aperture of primary air fan is 63 ~ 65%,
As 450mm≤d≤500mm, the aperture of primary air fan is 66 ~ 70%.
Combustion zone 6 is restored second, to accelerate eddy flow formed here, Temperature Distribution is made to be more uniformly distributed, reduced because of high temperature
The possibility of nitrogen oxides is generated, the aperture of lower overfire air fan is 90 ~ 95%, and upper secondary air duct 3 is set along burner hearth is radially uniform
It is equipped with four groups, upper secondary air duct stretches into the angle that one end of burner hearth and burner hearth tangent line are in 30 ~ 45 °.
Claims (9)
1. a kind of circulating fluidized bed boiler sunken bed forces down air quantity burning operation method, it is characterised in that include the following steps：
Fuel burns by the first oxygen debt combustion zone, the second reduction combustion zone, third burning-out zone successively from bottom to top；
The lower furnace portion of the first oxygen debt combustion zone is provided with a wind pipe, and First air enters cloth wind by a wind pipe
Plate, the bottom material thickness above the air distribution plate are less than 500mm, and the lower furnace portion of second reduction combustion zone and top are set respectively
It is equipped with lower secondary air duct and upper secondary air duct；The outer end of a wind pipe is connect with primary air fan, lower secondary air duct and
The outer end of upper secondary air duct is connect with lower overfire air fan and upper overfire air fan respectively；
The bottom material uses the clinker discharged in boiler operatiopn, and the grain size of the clinker is less than 8mm, and combustible content is no more than
5%；
In the operational process that burns, control primary air flow is no more than 1.25 times of critical flowing saturation.
2. circulating fluidized bed boiler sunken bed according to claim 1 forces down air quantity burning operation method, it is characterised in that：
The inner end that a wind pipe gos deep into burner hearth is provided with mushroom-shaped cap, is equipped with outward diagonally downward in the cap
Venthole, the internal diameter in the venthole stage casing is less than the internal diameter of leading portion and back segment, and leading portion and stage casing, stage casing and back segment are in oblique line
It is smoothly connected.
3. circulating fluidized bed boiler sunken bed according to claim 1 forces down air quantity burning operation method, it is characterised in that：Institute
It states cap outer surface and is coated with wear-resisting anti-stick coating.
4. circulating fluidized bed boiler sunken bed according to claim 1 forces down air quantity burning operation method, it is characterised in that：Institute
It states a wind pipe, lower secondary air duct and upper secondary air duct and stretches into 5 ~ 10cm of burner hearth, a wind pipe, lower secondary air duct
It is in outside burner hearth with upper secondary air duct and close one end is provided with vibrator.
5. circulating fluidized bed boiler sunken bed according to claim 1 forces down air quantity burning operation method, it is characterised in that：
A wind pipe outlet wind pressure minimum >=bed pressure.
6. circulating fluidized bed boiler sunken bed according to claim 2 forces down air quantity burning operation method, it is characterised in that：
The internal diameter in the venthole stage casing is the 1/4 ~ 1/3 of leading portion/back segment internal diameter.
7. circulating fluidized bed boiler sunken bed according to claim 1 forces down air quantity burning operation method, it is characterised in that：
The bottom material thickness is d, and as 250mm ＜ d ＜ 350mm, the aperture of primary air fan is 55 ~ 62%, as 350mm≤d ＜
When 450mm, the aperture of primary air fan is 63 ~ 65%, and as 450mm≤d≤500mm, the aperture of primary air fan is 66 ~ 70%.
8. circulating fluidized bed boiler sunken bed according to claim 7 forces down air quantity burning operation method, it is characterised in that：
The aperture of the lower overfire air fan is 90 ~ 95%.
9. circulating fluidized bed boiler sunken bed according to claim 1 forces down air quantity burning operation method, it is characterised in that：
The upper secondary air duct is uniformly arranged in the radial direction with four groups along burner hearth, and upper secondary air duct stretches into one end and the burner hearth of burner hearth
Tangent line is in 30 ~ 45 ° of angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810182448.8A CN108397767B (en) | 2018-03-06 | 2018-03-06 | Low-bed-pressure low-air-volume combustion operation method for circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810182448.8A CN108397767B (en) | 2018-03-06 | 2018-03-06 | Low-bed-pressure low-air-volume combustion operation method for circulating fluidized bed boiler |
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| Publication Number | Publication Date |
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| CN108397767A true CN108397767A (en) | 2018-08-14 |
| CN108397767B CN108397767B (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810182448.8A Active CN108397767B (en) | 2018-03-06 | 2018-03-06 | Low-bed-pressure low-air-volume combustion operation method for circulating fluidized bed boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410775A (en) * | 2019-07-18 | 2019-11-05 | 山东圣坤环保科技有限公司 | Solid fuel combustion apparatus |
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| JPH10103641A (en) * | 1996-10-01 | 1998-04-21 | Takuma Co Ltd | Method for supplying combustion air for fluidized bed combustion equipment |
| CN102003701A (en) * | 2010-11-23 | 2011-04-06 | 浙江大学 | Low NOx coal dust combustion method and device based on underfire air and overfire air |
| CN103216821A (en) * | 2013-04-27 | 2013-07-24 | 东方电气集团东方锅炉股份有限公司 | Multi-stage stratified combustion system and method for primary air and secondary air of boiler |
| CN103604117A (en) * | 2013-11-04 | 2014-02-26 | 武汉和信益科技有限公司 | Multi-grade high-efficiency low-nitrogen combustion method and multi-grade high-efficiency low-nitrogen combustion system for circulating fluidized bed boiler |
| CN103712208A (en) * | 2013-12-25 | 2014-04-09 | 北京兴侨国际工程技术有限公司 | Combustion method of circulating fluidized bed boiler with low nitrogen oxide emission |
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| CN105258113A (en) * | 2015-10-26 | 2016-01-20 | 隋恒睿 | Low-heating-value liquid and solid fluidized bed boiler and combustion technology |
| CN206112913U (en) * | 2016-07-29 | 2017-04-19 | 任浩 | Special pressure boost hood in corner |
-
2018
- 2018-03-06 CN CN201810182448.8A patent/CN108397767B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10103641A (en) * | 1996-10-01 | 1998-04-21 | Takuma Co Ltd | Method for supplying combustion air for fluidized bed combustion equipment |
| CN102003701A (en) * | 2010-11-23 | 2011-04-06 | 浙江大学 | Low NOx coal dust combustion method and device based on underfire air and overfire air |
| CN103216821A (en) * | 2013-04-27 | 2013-07-24 | 东方电气集团东方锅炉股份有限公司 | Multi-stage stratified combustion system and method for primary air and secondary air of boiler |
| CN103604117A (en) * | 2013-11-04 | 2014-02-26 | 武汉和信益科技有限公司 | Multi-grade high-efficiency low-nitrogen combustion method and multi-grade high-efficiency low-nitrogen combustion system for circulating fluidized bed boiler |
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| CN105258113A (en) * | 2015-10-26 | 2016-01-20 | 隋恒睿 | Low-heating-value liquid and solid fluidized bed boiler and combustion technology |
| CN206112913U (en) * | 2016-07-29 | 2017-04-19 | 任浩 | Special pressure boost hood in corner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410775A (en) * | 2019-07-18 | 2019-11-05 | 山东圣坤环保科技有限公司 | Solid fuel combustion apparatus |
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| CN108397767B (en) | 2020-09-01 |
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