CN219160337U - Cooling chamber structure of biomass circulating fluidized bed boiler - Google Patents
Cooling chamber structure of biomass circulating fluidized bed boiler Download PDFInfo
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- CN219160337U CN219160337U CN202320073792.XU CN202320073792U CN219160337U CN 219160337 U CN219160337 U CN 219160337U CN 202320073792 U CN202320073792 U CN 202320073792U CN 219160337 U CN219160337 U CN 219160337U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model relates to a cooling chamber structure of a biomass circulating fluidized bed boiler, which comprises a cooling chamber and a hearth which is connected with one side of the cooling chamber in a penetrating way; the cooling chamber is a rectangular local closed space surrounded by a plurality of water-cooling wall-covering pipes which are arranged side by side; the lower ends of the water-cooling wall covering pipes are connected to the same lower header pipeline in a penetrating way, the two lower header pipeline walls positioned at the short sides are connected with a plurality of dispersed downcomers, and the dispersed downcomers are connected to the steam drum in a penetrating way through the same concentrated downcomers; a plurality of lower communicating pipes are connected between the two lower header pipe walls on the long side in a penetrating way, and a plurality of groups of convection tube bundles are connected at the upper end of each lower communicating pipe in a penetrating way. The utility model has compact and reasonable structure, convenient operation, can effectively control the flow rate of the flue gas and the temperature of the flue gas outlet, and simultaneously improve the problems of ash accumulation and blockage of the superheater.
Description
Technical Field
The utility model relates to the technical field of biomass boiler cooling, in particular to a cooling chamber structure of a biomass circulating fluidized bed boiler.
Background
The biomass circulating fluidized bed boiler has low fuel heat value and ash content, and needs to be provided with more evaporation heating surfaces compared with the traditional coal-fired circulating fluidized bed boiler.
If the traditional hearth, the separator and the tail flue are combined, on one hand, as the required evaporation heating surface is increased, the simple increase of the hearth heating surface often leads the structural size of the hearth to be difficult to meet the normal flue gas flow rate and outlet temperature, and for a fluidized bed boiler, the abrasion is serious, and the flue gas flow rate and the temperature of the hearth outlet need to be strictly controlled in a certain range; on the other hand, the temperature of the flue gas at the inlet of the superheater at the tail flue and the accumulated ash are difficult to control, so that the performance of the boiler is influenced.
For this purpose we propose a cooling chamber structure for a biomass circulating fluidized bed boiler.
Disclosure of Invention
The applicant provides a cooling chamber structure of a biomass circulating fluidized bed boiler aiming at the defects in the prior art, which increases the evaporation heating area of the boiler, reduces the flow rate of flue gas and the temperature of a flue gas outlet, and ensures that the flow rate and the temperature of the flue gas outlet are maintained in a reasonable interval.
The technical scheme adopted by the utility model is as follows:
a cooling chamber structure of a biomass circulating fluidized bed boiler comprises a cooling chamber and a hearth which is connected with one side of the cooling chamber in a penetrating way;
the cooling chamber is a rectangular local closed space surrounded by a plurality of water-cooling wall-covering pipes which are arranged side by side;
the lower ends of the water-cooling wall covering pipes are connected to the same lower header pipeline in a penetrating way, the two lower header pipeline walls positioned at the short sides are connected with a plurality of dispersed downcomers, and the dispersed downcomers are connected to the steam drum in a penetrating way through the same concentrated downcomers;
a plurality of lower communicating pipes are connected between the two lower header pipe walls on the long side in a penetrating way, a plurality of groups of convection tube bundles are connected at the upper end of each lower communicating pipe in a penetrating way, a plurality of convection tube bundles on the same row are connected on the same upper communicating pipe, two ends of the upper communicating pipes are respectively connected on the front and rear upper headers of the same corresponding water-cooling wall, the front and rear upper headers of the two water-cooling wall are respectively connected with the upper ends of the two rows of water-cooling wall pipes on the long side in a penetrating way, the upper ends of the two rows of water-cooling wall pipes on the short side are connected on the corresponding upper headers on the water-cooling wall side in a penetrating way, and the upper ends of the front and rear upper headers of the water-cooling wall and the upper headers on the water-cooling wall side are connected with a steam drum through a plurality of lead-out pipes.
It is further characterized by:
the hearth is connected with the cyclone separator in a penetrating way, the upper end of the cyclone separator is inserted with a connecting flue, and the other end of the connecting flue is connected with the side wall of the cooling chamber in a penetrating way.
The lower end of the cooling chamber is open and connected with a lower ash bucket, and a flue gas outlet is formed in the side wall of the lower ash bucket.
The steam drum is positioned above the hearth.
The plurality of lower communicating pipes are distributed in parallel and equidistantly.
The convection banks are distributed in parallel at equal intervals, each convection bank at least comprises two convection banks, and the convection banks and the water-cooling wall-covering pipes are arranged in parallel.
The upper ends of the upper communicating pipes are connected with the same mounting plate, a heat insulation layer is arranged on the mounting plate, and meanwhile, the water-cooling wall-covering upper header is fixed on the mounting plate.
The beneficial effects of the utility model are as follows:
the utility model has compact and reasonable structure, convenient operation, can effectively control the flow rate of the flue gas and the temperature of the flue gas outlet, and simultaneously improve the problems of ash accumulation and blockage of the superheater.
Meanwhile, the utility model has the following advantages:
(1) The water in the lower header at the side of the water-cooling wall directly enters the water-cooling wall pipe, then enters the upper header at the side of the water-cooling wall, finally is led back to the steam drum through the eduction pipe, and the heat of part of flue gas can be taken away rapidly.
(2) The water in the lower header at the side of the water-cooling package wall enters the lower communicating pipe through the lower header before and after the water-cooling package wall, then enters the convection tube bundles, the dense convection tube bundles and the flue gas flow relatively, the flue gas can be rapidly cooled, meanwhile, the water vapor of the convection tube bundles enters the upper header before and after the water-cooling package wall through the upper communicating pipe, and finally is led back to the steam drum through the eduction tube, and cooling is performed again.
(3) Through natural circulation, water in the steam drum descends through concentrated downcomer and brings potential energy effect, and simultaneously, the convection bank is gasified due to contact with high-temperature flue gas, so that the water gas moves upwards, moves relatively with the flue gas, and improves the cooling effect.
(4) The circulation speed of the smoke can be reduced through the dense convection bank, so that dust in the smoke can conveniently fall into the ash hopper to be collected, and blockage is prevented.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a cross-sectional view of section A-A of fig. 1.
Fig. 3 is a cross-sectional view of section B-B of fig. 1.
Fig. 4 is a schematic diagram of the connection structure of the upper communicating pipe and the upper header before and after the water-cooled package wall in the present utility model.
Wherein: 1. a steam drum; 2. centralizing the downcomers; 3. a dispersion downcomer; 4. water-cooling wall-covering side lower header; 5. front and rear lower headers of the water-cooling wall-covering; 6. a lower communicating pipe; 7. water-cooling wall-covering pipe; 8. a convection bank; 9. an upper communicating pipe; 10. the front and rear of the water-cooling wall are provided with a header; 11. water-cooling wall-covering side upper header; 12. an eduction tube; 13. a furnace; 14. a cyclone separator; 15. connecting the flue; 16. a cooling chamber; 17. an ash hopper; 18. and a flue gas outlet.
Detailed Description
The following describes specific embodiments of the present utility model with reference to the drawings.
As shown in fig. 1-4, this embodiment discloses a cooling chamber structure of a biomass circulating fluidized bed boiler, including a furnace 13 and a cyclone 14 which are connected with each other, and a connecting flue 15 inserted at the upper end of the cyclone 14, the other end of the connecting flue 15 is connected on the side wall of the cooling chamber 16 in a penetrating way, high-temperature dust-containing flue gas in the cyclone 14 is introduced into the cooling chamber 16, the cooling chamber 16 is a local closed space surrounded by a plurality of water-cooling wall-covering pipes 7 arranged side by side, the cross section of the cooling chamber 16 in this embodiment is rectangular, and can be customized into any shape, the lower end of the cooling chamber 16 is open and is connected with a dust hopper 17, so that dust in the flue gas can leave from the lower end of the cooling chamber 16, and a flue gas outlet 18 is formed in the side wall of the dust hopper 17, so that the flue gas can leave conveniently.
The lower ends of the multi-row water-cooling wall-covering pipes 7 are connected on the same lower header pipe in a penetrating way, the lower header pipe comprises two groups of water-cooling wall-covering side lower headers 4 and water-cooling wall front and rear lower headers 5 which are connected in a penetrating way, in order to ensure that the structure of the cooling chamber 16 is more stable, a plurality of dispersion downcomers 3 are connected on the side walls of the two water-cooling wall-covering side lower headers 4 on the short sides, and the dispersion downcomers 3 are connected on the steam drum 1 above the hearth 13 through the same concentrated downcomers 2 and are used for introducing water in the steam drum 1 into the lower header pipe.
On one hand, water in the water-cooling package wall side lower header 4 enters into the water-cooling package wall front and back lower header 5, and meanwhile, a plurality of lower communicating pipes 6 which are distributed in parallel at equal intervals are connected between the two water-cooling package wall front and back lower headers 5 in a penetrating way, and as the lengths of the two water-cooling package wall side lower headers 4 are smaller, the lengths of the lower communicating pipes 6 can be ensured to be smaller, the unstable pressure bearing of a pipeline caused by overlarge span is prevented, and meanwhile, the installation and the maintenance are also not facilitated.
The upper end of each lower communicating pipe 6 is all connected with convection bank 8 of parallel equidistance distribution of multiunit, convection bank 8 and water-cooling package wall pipe 7 parallel arrangement improve with flue gas area of contact, include two at least convection banks 8 on every convection bank 8, upwards draw forth the water that introduces in the water-cooling package wall side lower header 4 from a plurality of convection bank 8, on the one hand through natural circulation, the potential energy effect that water in the steam drum 1 descends through concentrating downcomer 2, convection bank 8 and high temperature flue gas contact gasification for the aqueous vapor upwards moves, with flue gas relative movement, improve the cooling effect.
The convection tube bundles 8 positioned in the same row are connected to the same upper communicating tube 9, two ends of the upper communicating tube 9 are respectively and through-connected to the front and rear upper headers 10 of the same corresponding water-cooling package wall, meanwhile, the front and rear upper headers 10 of the water-cooling package wall are through-connected with the upper ends of the two rows of water-cooling package wall tubes 7 positioned on the long side, and the upper ends of the front and rear upper headers 10 of the water-cooling package wall are connected with the steam drum 1 through a plurality of eduction tubes 12 to educe water vapor into the steam drum 1;
the upper ends of two rows of water-cooling wall-covering pipes 7 positioned at the short sides are connected to the corresponding water-cooling wall-side upper header 11 in a penetrating way, and the upper ends of the water-cooling wall-side upper header 11 are also connected with the steam drum 1 through a plurality of eduction pipes 12 to educe water vapor into the steam drum 1.
The specific working principle is as follows:
the flue gas flow comprises the following steps: sequentially passes through a hearth 13, a cyclone separator 14, a connecting flue 15 and a cooling chamber 16, and finally enters an ash hopper 17.
The steam-water flow process comprises the following steps: water is introduced from the drum 1 through the concentrated downcomer 2 and the dispersed downcomer 3 into the water-cooled drum wall side header 4, and then split into two paths:
the first path directly enters the water-cooling wall-covering pipe 7, then enters the upper header 11 on the water-cooling wall-covering side, and finally is led back to the steam drum 1 through the eduction pipe 12, so that the heat of part of the flue gas can be rapidly taken away;
the other path enters the lower communicating pipe 6 through the water-cooling package wall front and back lower header 5 connected with the water-cooling package wall side lower header 4, then enters the convection bank 8, the dense convection bank 8 and the flue gas flow relatively, the flue gas can be rapidly cooled, meanwhile, the dense convection bank 8 can also reduce the circulation speed of the flue gas, dust in the flue gas conveniently falls into the ash hopper 17 to be collected, meanwhile, the water vapor of the convection bank 8 enters the water-cooling package wall front and back upper header 10 through the upper communicating pipe 9, and finally returns to the steam drum 1 through the eduction tube 12.
Example 2
Unlike embodiment 1, the multi-row water-cooled wall-covering pipe 7 covers only the side wall of the cooling chamber 16, and the plurality of upper communicating pipes 9 are used as supports to set the mounting plate as the top cover of the cooling chamber 16, and meanwhile, the heat insulation layer is arranged on the mounting plate, and meanwhile, the water-cooled wall-covering side upper header 11 is fixed on the top cover, so that the installation and layout are convenient.
The above description is intended to illustrate the utility model and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the utility model.
Claims (7)
1. A cooling chamber structure of biomass circulating fluidized bed boiler, which is characterized in that: comprises a cooling chamber (16) and a hearth (13) which is connected with one side of the cooling chamber (16) in a penetrating way;
the cooling chamber (16) is a rectangular local closed space surrounded by a plurality of water-cooling wall-covering pipes (7) which are arranged side by side;
the lower ends of the water-cooling wall covering pipes (7) are connected to the same lower header pipeline in a penetrating way, a plurality of scattered descending pipes (3) are connected to the two lower header pipeline walls positioned on the short sides, and the scattered descending pipes (3) are connected to the steam drum (1) in a penetrating way through the same concentrated descending pipe (2);
a plurality of lower communicating pipes (6) are connected between the two lower header pipe walls on the long side in a penetrating way, a plurality of groups of convection tube bundles (8) are connected at the upper end of each lower communicating pipe (6) in a penetrating way, a plurality of convection tube bundles (8) on the same row are connected on the same upper communicating pipe (9), two ends of the plurality of upper communicating pipes (9) are respectively connected on the same corresponding upper header (10) around the water-cooling package wall in a penetrating way, the two upper headers (10) around the water-cooling package wall are respectively connected with the upper ends of the two rows of water-cooling package wall pipes (7) on the long side in a penetrating way, the upper ends of the two rows of water-cooling package wall pipes (7) on the short side are connected on the corresponding upper header (11) on the water-cooling package wall side, and the upper ends of the upper header (10) around the water-cooling package wall and the upper header (11) are connected with the steam drum (1) through a plurality of lead-out pipes (12).
2. A cooling chamber structure of a biomass circulating fluidized bed boiler according to claim 1, wherein: the hearth (13) is connected with the cyclone separator (14) in a penetrating way, the upper end of the cyclone separator (14) is connected with the connecting flue (15) in an inserting way, and the other end of the connecting flue (15) is connected with the cooling chamber (16) in a penetrating way.
3. A cooling chamber structure of a biomass circulating fluidized bed boiler according to claim 1, wherein: the lower end of the cooling chamber (16) is open and is connected with a lower ash bucket (17), and a flue gas outlet (18) is formed in the side wall of the lower ash bucket (17).
4. A cooling chamber structure of a biomass circulating fluidized bed boiler according to claim 1, wherein: the steam drum (1) is positioned above the hearth (13).
5. A cooling chamber structure of a biomass circulating fluidized bed boiler according to claim 1, wherein: the plurality of lower communicating pipes (6) are distributed in parallel and equidistantly.
6. A cooling chamber structure of a biomass circulating fluidized bed boiler according to claim 1, wherein: the convection banks (8) are distributed in parallel and equidistantly, each convection bank (8) at least comprises two convection banks (8), and the convection banks (8) and the water-cooling wall-covering pipes (7) are arranged in parallel.
7. A cooling chamber structure of a biomass circulating fluidized bed boiler according to claim 1, wherein: the upper ends of the upper communicating pipes (9) are connected with the same mounting plate, a heat insulation layer is arranged on the mounting plate, and meanwhile, the water-cooling wall-covering side upper header (11) is fixed on the mounting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320073792.XU CN219160337U (en) | 2023-01-10 | 2023-01-10 | Cooling chamber structure of biomass circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320073792.XU CN219160337U (en) | 2023-01-10 | 2023-01-10 | Cooling chamber structure of biomass circulating fluidized bed boiler |
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| Publication Number | Publication Date |
|---|---|
| CN219160337U true CN219160337U (en) | 2023-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320073792.XU Active CN219160337U (en) | 2023-01-10 | 2023-01-10 | Cooling chamber structure of biomass circulating fluidized bed boiler |
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| CN (1) | CN219160337U (en) |
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2023
- 2023-01-10 CN CN202320073792.XU patent/CN219160337U/en active Active
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