CN109084323B - Dust deposit baffle device is prevented to big bellows - Google Patents
Dust deposit baffle device is prevented to big bellows Download PDFInfo
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- CN109084323B CN109084323B CN201810940349.1A CN201810940349A CN109084323B CN 109084323 B CN109084323 B CN 109084323B CN 201810940349 A CN201810940349 A CN 201810940349A CN 109084323 B CN109084323 B CN 109084323B
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- large bellows
- rear wall
- partition
- wall
- inclined plane
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses an ash deposition preventing baffle plate device of a large bellows. The invention comprises two side wall horizontal partition boards and front and rear wall inclined plane partition boards. The two side wall horizontal partition plates are horizontally paved in the two side wall large bellows at the lower edge of the large bellows air inlet and extend to the edges of the front wall large bellows and the rear wall large bellows, and the elevation is flush with or slightly lower than the lower edge of the large bellows air inlet. The front and rear wall inclined plane partition plates are aligned with the two side wall horizontal partition plates near the two side wall ends, a triangular inclined plane is formed by inclining from the two sides upwards to the center of the front (rear) wall, the inclination angle is 2-5 degrees, and the inclined plane partition plates are specifically required to be determined according to the distance between the two side wall horizontal partition plates and the bottom of the burner. The invention eliminates the low-speed vortex area at the bottom of the large bellows through the large bellows ash deposition preventing baffle device to prevent ash deposition, and realizes self-cleaning of a small amount of ash deposition according to the flow and distribution rules of wind in the front and back wall bellows.
Description
Technical Field
The invention belongs to the field of power equipment systems, and relates to an ash deposition preventing baffle plate device of a large bellows.
Background
With the large-capacity development of the coal-fired generator set, the front and rear wall opposed firing boilers occupy a large proportion. The secondary air of the opposite combustion of the front wall and the rear wall adopts a large bellows structure, the large bellows surrounds the outer side of the water-cooled wall of the hearth, and the secondary air enters the large bellows from the two side walls, flows to the front wall and the rear wall and enters the burner arranged in the large bellows. Long-term operation shows that serious ash accumulation phenomenon exists in large bellows of most boilers, the ash accumulation thickness can reach more than tens of centimeters, even the ash accumulation amount can reach tens of tons to hundreds of tons from the large bellows floor to the bottom of the burner, and the operation safety of the boilers is seriously affected, including bellows bearing deformation, bellows bottom leakage, instantaneous loss of burner fire detection signals and the like. In most cases, the power plant generally adopts a method of regular cleaning to remove ash, so that the workload is high, and the ash removal process also affects the environment and the human health to a certain extent, and even affects the normal operation of the boiler. The bottom plate of the large air box of the boiler is lower than the bottom of the air inlet, so that the effective utilization of heat dissipation of a hearth is theoretically facilitated, the pressure distribution in the air box is balanced, but in practice, the problem of serious dust accumulation is often caused, the corresponding purpose cannot be achieved, and certain potential safety hazard is brought.
Disclosure of Invention
The invention provides an ash accumulation preventing baffle plate device for a large air box of an existing boiler, which aims to solve the problem of serious ash accumulation of the large air box of the existing boiler.
The technical scheme adopted for solving the technical problems is as follows:
the invention comprises two side wall horizontal partition boards and front and rear wall inclined plane partition boards.
The two side wall horizontal partition plates are formed by welding steel plates, are horizontally paved in the two side wall large bellows at the lower edge of the large bellows air inlet, extend to the edges of the front wall large bellows and the rear wall large bellows, and are level with or slightly lower than the lower edge of the large bellows air inlet (less than or equal to 300 mm). When the distance between the lower edge of the air inlet of the large air box and the bottom plate of the large air box is less than or equal to 300mm, two side wall horizontal partition plates are not required to be installed.
The front wall inclined plane partition plate and the rear wall inclined plane partition plate are formed by welding steel plates, the two side wall ends are aligned with the two side wall horizontal partition plates (when the distance between the lower edge of the air inlet of the large bellows and the bottom plate of the large bellows is less than or equal to 300mm and the two side wall horizontal partition plates are not installed, the two side wall horizontal partition plates are directly welded with the bottom plate of the large bellows), the two sides of the front wall inclined plane partition plate and the rear wall inclined plane partition plate are inclined upwards to the center of the front wall (rear wall) to form a triangular inclined plane, and the inclined angle is 2-5 degrees, and is specifically required to be determined according to the distance between the two side wall horizontal partition plates and the bottom of the burner.
The two side wall horizontal partition boards and the front and rear wall inclined plane partition boards are fixed through steel beams in the large bellows.
The thickness of the steel plates is 1-6mm, the specific thickness can be determined according to the support conditions of site installation, and the steel plates can bear the maintenance personnel to stand without obvious deformation.
The installation of the two side wall horizontal partition plates and the front wall inclined plane partition plates and the rear wall inclined plane partition plates needs to have certain tightness so as to prevent dust in secondary air from depositing and falling at a gap.
The invention has the following beneficial effects:
the inventor has conducted numerical simulation research on the flow field of the gas-solid multiphase flow in the large bellows, and obtained that as the bottoms of the air inlets of the two side walls of the large bellows are higher than the bottom plate of the large bellows, the elevation of the burner is basically positioned in the middle of the air inlet, and the total air flow velocity in the large bellows is lower, the air flow velocity in the lower area of the large bellows is very low, and a low-speed vortex area is formed. The secondary air from the air preheater contains a certain amount of dust, and the dust is easy to deposit in a low-speed vortex area at the lower part of the large bellows. The invention aims to prevent dust accumulation by eliminating a low-speed vortex area at the bottom of a large bellows through the dust accumulation prevention baffle device of the large bellows, and realize self-cleaning of a small amount of dust accumulation according to the flow and distribution rules of wind in front and back wall bellows.
Drawings
Fig. 1 is a schematic view of the structural principle of the present invention.
In the figure: 1. two side wall horizontal partition boards; 2. front and rear wall inclined plane partition boards; 3. a large bellows bottom plate; 4. an air inlet of the large bellows; 5. a burner.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, the large bellows ash deposition preventing baffle plate device comprises two side wall horizontal baffle plates 1 and front and rear wall inclined plane baffle plates 2.
The two side wall horizontal partition plates 1 are formed by welding steel plates, are horizontally paved in the two side wall large bellows at the lower edge of the large bellows air inlet 4, extend to the edges of the front wall large bellows and the rear wall large bellows, and are level with or slightly lower than (less than or equal to 300 mm) the lower edge of the large bellows air inlet 4. When the distance between the lower edge of the air inlet 4 of the large air box and the bottom plate 3 of the large air box is less than or equal to 300mm, the two side wall horizontal partition plates 1 are not required to be installed.
The front wall inclined plane partition plate and the rear wall inclined plane partition plate 2 are formed by welding steel plates, two side wall ends are aligned with the two side wall horizontal partition plates 1 (when the distance between the lower edge of the large air box air inlet 4 and the large air box bottom plate 3 is less than or equal to 300mm and the two side wall horizontal partition plates 1 are not installed, the two side wall inclined plane partition plates are directly welded with the large air box bottom plate), two sides are inclined upwards to the center of the front (rear) wall to form a triangular inclined plane, the inclination angle is 2-5 degrees, and the inclined plane is specifically required to be determined according to the distance between the two side wall horizontal partition plates 1 and the bottom of the combustor 5.
The two side wall horizontal partition boards 1 and the front and rear wall inclined plane partition boards 2 are fixed through steel beams in the large bellows.
The two side wall horizontal partition boards 1, the front wall inclined plane partition board 2 and the rear wall inclined plane partition board 2 have the thickness of 1-6mm, the specific thickness can be determined according to the support conditions of on-site installation, and the steel plates can bear the maintenance personnel to stand without obvious deformation.
The two side wall horizontal partition boards 1 and the front wall inclined plane partition board 2 are required to be installed with certain tightness so as to prevent dust in secondary air from depositing and falling at a gap.
Claims (8)
1. The ash deposition preventing baffle plate device of the large bellows is characterized by comprising two side wall horizontal baffle plates and front and rear wall inclined plane baffle plates;
the two side wall horizontal partition plates are formed by welding steel plates and are horizontally paved in the two side wall large bellows at the lower edge of the large bellows air inlet and extend to the edges of the front wall large bellows and the rear wall large bellows, and the elevation is level with or slightly lower than the lower edge of the large bellows air inlet;
the front wall inclined plane partition plate and the rear wall inclined plane partition plate are formed by welding steel plates, and the ends close to the two side walls are aligned with the horizontal partition plates of the two side walls; the two sides of the front wall and the rear wall are inclined upwards to form a triangular inclined plane at the center of the front wall and the rear wall, and the inclination angle is 2-5 degrees;
the slightly lower part is 300mm or less.
2. The ash deposition preventing partition board device for the large bellows according to claim 1, wherein the horizontal partition boards of the two side walls and the inclined partition boards of the front wall and the rear wall are fixed through steel beams in the large bellows.
3. The ash deposition preventing partition plate device for the large bellows according to claim 2, wherein the thickness of the steel plates of the horizontal partition plates of the two side walls and the inclined partition plates of the front wall and the rear wall is 1-6mm, and the large bellows can bear the maintenance personnel without obvious deformation when standing.
4. The ash deposition preventing partition device for large bellows according to claim 3, wherein the horizontal partition plates of the two side walls and the inclined partition plates of the front wall and the rear wall are required to be installed in a sealing manner to prevent dust in the secondary air from falling down in the gaps.
5. The large bellows ash deposition preventing partition plate device is characterized by comprising a front wall inclined surface partition plate and a rear wall inclined surface partition plate, wherein the distance between the lower edge of an air inlet of the large bellows and the large bellows bottom plate is less than or equal to 300mm, the front wall inclined surface partition plate and the rear wall inclined surface partition plate are formed by welding steel plates and are directly welded with the large bellows bottom plate, triangular inclined surfaces are formed from two sides to the centers of a front wall and a rear wall in an inclined mode, and the inclined angle is 2-5 degrees.
6. The ash deposition preventing partition board device for large bellows according to claim 5, wherein the front and rear wall inclined plane partition boards are fixed by steel beams inside the large bellows.
7. The ash deposition preventing partition board device for large bellows according to claim 6, wherein the thickness of the steel plate of the front and rear wall inclined plane partition boards is 1-6mm, and the steel plate can bear the maintenance personnel without obvious deformation when standing.
8. The ash deposition preventing partition device for large bellows according to claim 7, wherein the front and rear wall inclined planes are installed in a sealing manner to prevent dust in the secondary air from falling down at the gaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810940349.1A CN109084323B (en) | 2018-08-17 | 2018-08-17 | Dust deposit baffle device is prevented to big bellows |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810940349.1A CN109084323B (en) | 2018-08-17 | 2018-08-17 | Dust deposit baffle device is prevented to big bellows |
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| Publication Number | Publication Date |
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| CN109084323A CN109084323A (en) | 2018-12-25 |
| CN109084323B true CN109084323B (en) | 2023-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810940349.1A Active CN109084323B (en) | 2018-08-17 | 2018-08-17 | Dust deposit baffle device is prevented to big bellows |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339827A (en) * | 2021-05-31 | 2021-09-03 | 苏州西热节能环保技术有限公司 | Device for preventing dust deposition of secondary layer air box of boiler |
| CN114060844B (en) * | 2021-11-24 | 2023-12-26 | 国能蚌埠发电有限公司 | Prevent bellows structure of overgrate air case deposition |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000304237A (en) * | 1999-04-16 | 2000-11-02 | Ishikawajima Harima Heavy Ind Co Ltd | Device for preventing ash deposition |
| CN203116049U (en) * | 2013-01-23 | 2013-08-07 | 国电科学技术研究院 | Soot blowing system of boiler hot air box |
| CN205640953U (en) * | 2016-05-12 | 2016-10-12 | 山东奥能电力科技有限公司 | Real -time ash removal device of power plant boiler secondary wind box |
| JP2017089911A (en) * | 2015-11-02 | 2017-05-25 | 三菱日立パワーシステムズ株式会社 | Burner unit, boiler and slag removal method |
| CN206831532U (en) * | 2017-05-11 | 2018-01-02 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of boiler bellows accumulatingdust device |
| CN207378807U (en) * | 2017-07-31 | 2018-05-18 | 中国大唐集团科学技术研究院有限公司西北分公司 | A kind of boiler secondary bellows |
| CN108151054A (en) * | 2017-12-01 | 2018-06-12 | 浙江浙能技术研究院有限公司 | A kind of secondary air bellow accumulatingdust device |
| CN208859643U (en) * | 2018-08-17 | 2019-05-14 | 浙江浙能温州发电有限公司 | Big bellows accumulatingdust baffle plate device |
-
2018
- 2018-08-17 CN CN201810940349.1A patent/CN109084323B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000304237A (en) * | 1999-04-16 | 2000-11-02 | Ishikawajima Harima Heavy Ind Co Ltd | Device for preventing ash deposition |
| CN203116049U (en) * | 2013-01-23 | 2013-08-07 | 国电科学技术研究院 | Soot blowing system of boiler hot air box |
| JP2017089911A (en) * | 2015-11-02 | 2017-05-25 | 三菱日立パワーシステムズ株式会社 | Burner unit, boiler and slag removal method |
| CN205640953U (en) * | 2016-05-12 | 2016-10-12 | 山东奥能电力科技有限公司 | Real -time ash removal device of power plant boiler secondary wind box |
| CN206831532U (en) * | 2017-05-11 | 2018-01-02 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of boiler bellows accumulatingdust device |
| CN207378807U (en) * | 2017-07-31 | 2018-05-18 | 中国大唐集团科学技术研究院有限公司西北分公司 | A kind of boiler secondary bellows |
| CN108151054A (en) * | 2017-12-01 | 2018-06-12 | 浙江浙能技术研究院有限公司 | A kind of secondary air bellow accumulatingdust device |
| CN208859643U (en) * | 2018-08-17 | 2019-05-14 | 浙江浙能温州发电有限公司 | Big bellows accumulatingdust baffle plate device |
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| CN109084323A (en) | 2018-12-25 |
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