CN110542080B - Built-in pipe rotational flow blowing device in overgrate air furnace directly above CFB boiler - Google Patents
Built-in pipe rotational flow blowing device in overgrate air furnace directly above CFB boiler Download PDFInfo
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- CN110542080B CN110542080B CN201810530328.2A CN201810530328A CN110542080B CN 110542080 B CN110542080 B CN 110542080B CN 201810530328 A CN201810530328 A CN 201810530328A CN 110542080 B CN110542080 B CN 110542080B
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- air
- pipe
- jetting
- main
- main pipe
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- 238000007664 blowing Methods 0.000 title claims description 4
- 239000003245 coal Substances 0.000 claims abstract description 24
- 238000005299 abrasion Methods 0.000 claims abstract description 18
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000002956 ash Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention protects a rotational flow jetting device of an embedded pipe in a secondary air furnace on a CFB boiler, which comprises a plurality of cantilever-shaped air jetting main pipes inserted into a hearth of the CFB boiler, wherein the air jetting main pipes are all arranged right above a coal feeding port, a plurality of openings are arranged on the lower half circumference of the pipe wall of the air jetting main pipe for downwards rotational flow air jetting, the air jetting main pipes are all connected to an air supply main pipe, an anti-abrasion air cavity structure is arranged on the windward side of the air jetting main pipe, the anti-abrasion air cavity structure is an annular film air cavity surrounded by the air cavity wall on the windward side of the air jetting main pipe, the air supply main pipe also supplies secondary air to the annular film air cavity to form anti-abrasion film state air, and the air supply main pipe can adopt an elliptic pipeline with a short axis level or an eccentric variable cross section pipeline with a bottom line level.
Description
Technical Field
The invention relates to a CFB boiler, and belongs to the field of power engineering.
Background
One of the main disadvantages of CFB boilers compared to pulverized coal boilers is the low boiler efficiency, while the disadvantage in which the mechanical incomplete combustion heat loss q4 is greater than in pulverized coal boilers is particularly pronounced.
The existing CFB boiler is provided with an upper layer of secondary air and a lower layer of secondary air at two sides of a coal feeding port, the air-coal mass transfer effect is poor, an oxygen-enriched area and a coal-enriched area exist, the oxygen-enriched area and the fuel-enriched area (comprising gas combustible materials and combustible carbon) cannot be combined optimally due to insufficient transverse movement capability, and the CFB boiler can only go on the way in each area until a hearth outlet, and particularly after the combustion reaction is partially completed in a cyclone separator, namely the aftercombustion phenomenon of the CFB boiler exists. "post-combustion" is a major issue that must be considered in boiler design.
The fine particles which can not be captured by the separator have the opportunity to reenter the furnace to burn and release heat when a fly ash recycling system is arranged, and most of the rest can only be expected to be exclamated by the furnace, be wasted and become the main flow of the carbon content of the fly ash. After the larger particles separated by the separator are returned to the hearth by the material returning device, the larger particles are circularly combusted for a plurality of times and ground, and part of the larger particles can not be returned to the hearth finally, so that the fly ash carbon-containing army is added.
In the prior art, as shown in fig. 1, a plurality of secondary air ports are arranged on the front (rear) wall, but in this way, secondary air and coal dust are easy to cause insufficient mixing combustion, the combustion efficiency is low, and how to reduce heat loss and improve the combustion efficiency caused by incomplete combustion of the part is a problem to be solved urgently.
Disclosure of Invention
The invention solves the technical problem of providing a rotational flow jetting device for buried pipes in a secondary air furnace directly above a CFB boiler.
The technical means adopted by the invention are as follows.
The utility model provides a CFB boiler directly over secondary air stove in-pipe rotational flow jetting device, includes the air-jetting main pipe that a plurality of cantilevers inserted CFB boiler furnace, every air-jetting main pipe sets up directly over the coal feed mouth, the pipe wall lower half of air-jetting main pipe sets up a plurality of trompils, downward air-jetting.
The plurality of air-jetting main pipes are all connected to the air supply main pipe, and the air supply main pipe is introduced with secondary air.
The air injection main pipe is arranged right above the coal feeding port and is arranged on the same side or opposite side with the coal feeding port.
And a cyclone is arranged at the opening.
And a plurality of cyclone blowing branch pipes are arranged in the openings.
The windward side of the air-jetting main pipe is provided with an anti-abrasion air cavity structure.
The anti-abrasion air cavity structure comprises an air cavity wall arranged on the windward side of the air-jetting main pipe, an annular film air cavity is formed between the air cavity wall and the air-jetting main pipe, one side end and the upper end of the air cavity wall are connected and sealed with the air-jetting main pipe through a sealing plate, the other side end of the air cavity wall is not sealed, an annular film air cavity air outlet is formed, the plurality of air-jetting main pipes are all connected to an air supply main pipe, secondary air is introduced into the air supply main pipe, a boundary jet air supply pipe is arranged on the air supply main pipe, and the boundary jet air supply pipe comprises a plurality of branches which are respectively connected with the air inlet pipe.
The air-jetting main pipe adopts an elliptic pipeline, and the short axis of the air-jetting main pipe is horizontally arranged.
The air-jet main pipe adopts an eccentric variable cross-section pipeline with a horizontal bottom line, and the cross section of the air-jet main pipe is gradually reduced from the outer end to the inner end.
The beneficial effects of the invention are as follows.
1. The invention can effectively solve the air supply problem of the anoxic zone of the CFB boiler, and can realize the maximum possible space-time matching of the oxygen quantity and the air required by fuel combustion.
2. The abrasion-proof problem of the pipeline is mainly solved by isolating the pipeline wall from the flushing flow of the flue gas particles by adopting an air film, other conventional abrasion-proof measures can be adopted, abrasion is not worried about, and even if the pipeline is worn out locally, air leakage occurs, only the controlled direction and flow of the air flow are influenced, and no furnace shutdown treatment is needed.
3. The air supply main pipe adopts a cantilever mode, the thermal expansion is not limited, the root temperature is low, the strength is highest, the air supply main pipe is suitable for stress requirements, and the air supply main pipe sprays downwards during operation, so that part of gravity can be counteracted.
4. After the method is implemented, the loss of q3 and q4 can be directly reduced, and the boiler efficiency can be improved by about 1-3% according to different conditions of coal types and the like, so that the service life of limited coal resources of the earth is prolonged.
5. Due to the improvement of the boiler efficiency and the reduction of the coal consumption in unit time, the invention can directly reduce the emission of pollutants and improve the quality of ash (due to the reduction of carbon content).
6. The invention can also reduce the height of the hearth and the pressure head of the secondary air blower, thereby reducing the primary investment of engineering and the power consumption of operation.
7. The invention can break through the limit of the design width-depth ratio of the CFB boiler.
Drawings
FIG. 1 is a schematic diagram of the positions of a coal feed port and an upper secondary air port on a front (rear) wall in the prior art.
FIG. 2 is a schematic top view of the secondary air duct and boundary jet air distribution system in the furnace of the present invention.
FIG. 3 is a schematic view of the structure of the anti-abrasion air cavity of the ring membrane of the air pipe in the invention.
FIG. 4 is a schematic cross-sectional view of a bellows annular membrane anti-abrasion air chamber structure in accordance with the present invention.
FIG. 5 is a schematic diagram of the positions of the A-A surfaces of a coal feeding port on the front (rear) wall and a main pipe of the secondary air injection.
Detailed Description
The invention provides a rotational flow jetting device for buried pipes in a secondary air furnace directly above a CFB boiler.
As shown in fig. 1, a plurality of air-jet main pipes 2 are included. The air-jetting main pipe 2 is inserted into the CFB boiler furnace in a cantilever shape. The plurality of air-jetting main pipes 2 are all connected with the air supply main pipe 1 from the secondary hot air duct.
As shown in fig. 5, the position of the air injection main pipe 2 is set directly above the coal feed port 5. The lower half of the pipe wall of the main pipe 2 is provided with holes, namely, the direction of the holes is the windward side, a cyclone is arranged in each hole and used for secondary air cyclone air spraying, and the hole opening rate, the hole pattern, the hole diameter and the like of the holes are set according to specific practical conditions.
As shown in fig. 2 and 3, the windward side of the main air-jetting pipe 2 is provided with an anti-abrasion air cavity structure 4, which comprises an air cavity wall 41 at the windward side half-turn, an annular air cavity 43 is formed between the air cavity wall 41 and the pipe wall of the main air-jetting pipe 2, one side end and the upper end of the air cavity wall 41 are connected and sealed with the main air-jetting pipe 2 through a sealing plate 42, the other side end of the air cavity wall 41 is not sealed, an annular air cavity air outlet 44 is formed, and an air inlet pipe 45 is arranged on the air cavity wall 41.
The air supply main pipe 1 is also connected with a boundary jet air supply pipe 3, which is provided with a plurality of branches respectively connected with an air inlet pipe 45 of the anti-abrasion air cavity structure 4, and secondary air is provided for forming annular anti-abrasion membranous air on the windward side.
The air-jetting main pipe 2 adopts an elliptic pipeline, the short shaft of the air-jetting main pipe is horizontally arranged, or an eccentric variable cross-section pipeline with a horizontal bottom line can be adopted, and the direction from the outer end cross section to the inner end cross section of the air-jetting main pipe 2 is gradually reduced.
When in actual use, the flow of the secondary air is controlled through the valve on the air supply main pipe 1, the secondary air is downwards cyclone and sprayed after entering each air spraying main pipe 2, and at the moment, the secondary air is directly sent to the coal inlet of the lower part to enter the coal flow of the furnace, so that compared with the conventional side air distribution, the air is easier to mix with the coal flow, and the combustion efficiency is improved. And meanwhile, the flow of the secondary air entering the anti-abrasion air cavity structure is controlled through the valve of the boundary jet flow air supply pipe 3 to form the flow of the film state air, so that the anti-abrasion function is adjusted according to the actual rotational flow state requirement in the hearth.
The invention can effectively solve the air supply problem of an anoxic zone of the CFB boiler, so that the maximum possible space-time matching of the oxygen amount and the air required by the fuel combustion is realized, the self anti-abrasion problem of the pipeline is mainly solved by isolating the pipeline wall from the flushing flow of smoke particles by adopting an air film, other conventional anti-abrasion measures can be adopted, abrasion cannot become worry problem, and even if the pipeline is worn through locally, air leakage only affects the controlled direction and flow of the air flow, and no shutdown treatment is needed. The air supply main pipe adopts a cantilever mode, the thermal expansion is not limited, the root temperature is low, the strength is highest, the air supply main pipe is suitable for stress requirements, and the air supply main pipe sprays downwards during operation, so that part of gravity can be counteracted.
After the method is implemented, the loss of q3 and q4 can be directly reduced, and the boiler efficiency can be improved by about 1-3% according to different conditions of coal types and the like, so that the service life of limited coal resources of the earth is prolonged.
Due to the improvement of the boiler efficiency and the reduction of the coal consumption in unit time, the invention can directly reduce the emission of pollutants and improve the quality of ash (due to the reduction of carbon content).
In addition, the invention can also reduce the height of the hearth and the pressure head of the secondary air blower, thereby reducing the primary investment and the running electricity consumption of the engineering.
Claims (7)
1. The rotational flow jetting device for the buried pipe in the overgrate air furnace of the CFB boiler is characterized by comprising a plurality of air jetting main pipes (2) which are inserted into a hearth of the CFB boiler in a cantilever manner, wherein each air jetting main pipe (2) is arranged right above a coal feeding port, a plurality of holes are arranged on the lower half circumference of the pipe wall of each air jetting main pipe (2), and downwards jets air;
an anti-abrasion air cavity structure (4) is arranged on the windward side of the air-jet main pipe (2);
The anti-abrasion air cavity structure (4) comprises an air cavity wall (41) arranged on the windward side of the air-jet main pipe (2), an annular film air cavity (43) is formed between the air cavity wall (41) and the air-jet main pipe (2), one side end and the upper end of the air cavity wall (41) are connected and sealed with the air-jet main pipe (2) through a sealing plate (42), the other side end of the air cavity wall (41) is not sealed, an annular film air cavity air outlet (44) is formed, and an air inlet pipe (45) is arranged on the air cavity wall (41);
The plurality of air-jetting main pipes (2) are all connected to the air supply main pipe (1), secondary air is introduced into the air supply main pipe (1), the air supply main pipe (1) is also provided with a boundary jet flow air supply pipe (3), and the boundary jet flow air supply pipe (3) comprises a plurality of branches which are respectively connected with the air inlet pipe (45).
2. The rotational flow jetting device for buried pipes in a CFB boiler directly above a secondary air furnace according to claim 1, wherein a plurality of main air jetting pipes (2) are connected to a main air supply pipe (1), and the main air supply pipe (1) is filled with secondary air.
3. The rotational flow jetting device for buried pipes in a CFB boiler directly above a overgrate air furnace according to claim 1, wherein the main air jetting pipe (2) is arranged directly above the coal feeding port (5) and is arranged on the same side as the coal feeding port or on the opposite side.
4. The rotational flow blowing device for buried pipes in a overgrate air furnace of a CFB boiler as recited in claim 1, wherein said openings are provided with cyclones.
5. The apparatus of claim 1, wherein a plurality of swirl injection branches are disposed in the openings.
6. A device for injecting rotational flow into a buried pipe in a overgrate air furnace in a CFB boiler according to any one of claims 1 to 5, wherein said main air injection pipe (2) is an elliptical pipe with its short axis horizontally disposed.
7. The rotational flow jetting device for buried pipes in a CFB boiler directly-upper overgrate air furnace according to any one of claims 1 to 5, wherein the main air jetting pipe (2) adopts an eccentric variable cross-section pipeline with a horizontal bottom line, and the cross section of the main air jetting pipe (2) is gradually reduced from the outer end to the inner end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810530328.2A CN110542080B (en) | 2018-05-29 | 2018-05-29 | Built-in pipe rotational flow blowing device in overgrate air furnace directly above CFB boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810530328.2A CN110542080B (en) | 2018-05-29 | 2018-05-29 | Built-in pipe rotational flow blowing device in overgrate air furnace directly above CFB boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110542080A CN110542080A (en) | 2019-12-06 |
| CN110542080B true CN110542080B (en) | 2024-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810530328.2A Active CN110542080B (en) | 2018-05-29 | 2018-05-29 | Built-in pipe rotational flow blowing device in overgrate air furnace directly above CFB boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110542080B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09126414A (en) * | 1995-10-31 | 1997-05-16 | Mitsubishi Heavy Ind Ltd | Combustion device |
| CN202018035U (en) * | 2011-03-18 | 2011-10-26 | 中国电力企业联合会科技开发服务中心 | Fluidized bed boiler provided with plug-type air pipes |
| CN202024322U (en) * | 2011-03-11 | 2011-11-02 | 中国电力企业联合会科技开发服务中心 | Low wind pressure circulating fluidized bed boiler |
| CN202769643U (en) * | 2012-09-28 | 2013-03-06 | 烟台龙源电力技术股份有限公司 | Wall type pulverized coal combustion tower type furnace |
| CN206803183U (en) * | 2017-05-25 | 2017-12-26 | 宁波众茂姚北热电有限公司 | A kind of CFB circulating fluid bed boiler secondary airs system |
| CN207006215U (en) * | 2017-06-06 | 2018-02-13 | 青县瑞通能源科技有限公司 | Environment-friendly high-efficiency biomass Industrial Boiler |
| CN207350786U (en) * | 2017-09-18 | 2018-05-11 | 陕西山高水远机械制造有限公司 | A kind of new coal powder hot-blast stove |
| CN208253570U (en) * | 2018-05-29 | 2018-12-18 | 中国电力工程顾问集团华北电力设计院有限公司 | Pipe laying eddy flow blowing device in the just upper Quadratic ballistic of CFB boiler |
-
2018
- 2018-05-29 CN CN201810530328.2A patent/CN110542080B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09126414A (en) * | 1995-10-31 | 1997-05-16 | Mitsubishi Heavy Ind Ltd | Combustion device |
| CN202024322U (en) * | 2011-03-11 | 2011-11-02 | 中国电力企业联合会科技开发服务中心 | Low wind pressure circulating fluidized bed boiler |
| CN202018035U (en) * | 2011-03-18 | 2011-10-26 | 中国电力企业联合会科技开发服务中心 | Fluidized bed boiler provided with plug-type air pipes |
| CN202769643U (en) * | 2012-09-28 | 2013-03-06 | 烟台龙源电力技术股份有限公司 | Wall type pulverized coal combustion tower type furnace |
| CN206803183U (en) * | 2017-05-25 | 2017-12-26 | 宁波众茂姚北热电有限公司 | A kind of CFB circulating fluid bed boiler secondary airs system |
| CN207006215U (en) * | 2017-06-06 | 2018-02-13 | 青县瑞通能源科技有限公司 | Environment-friendly high-efficiency biomass Industrial Boiler |
| CN207350786U (en) * | 2017-09-18 | 2018-05-11 | 陕西山高水远机械制造有限公司 | A kind of new coal powder hot-blast stove |
| CN208253570U (en) * | 2018-05-29 | 2018-12-18 | 中国电力工程顾问集团华北电力设计院有限公司 | Pipe laying eddy flow blowing device in the just upper Quadratic ballistic of CFB boiler |
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| Publication number | Publication date |
|---|---|
| CN110542080A (en) | 2019-12-06 |
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