CN215765196U - Direct current secondary air chamber pressure stabilizing structure and air door baffle - Google Patents
Direct current secondary air chamber pressure stabilizing structure and air door baffle Download PDFInfo
- Publication number
- CN215765196U CN215765196U CN202122282730.3U CN202122282730U CN215765196U CN 215765196 U CN215765196 U CN 215765196U CN 202122282730 U CN202122282730 U CN 202122282730U CN 215765196 U CN215765196 U CN 215765196U
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- Prior art keywords
- secondary air
- air chamber
- air door
- current secondary
- direct
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Links
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 12
- 238000005192 partition Methods 0.000 claims abstract description 21
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- 239000003245 coal Substances 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000010304 firing Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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Abstract
A direct current secondary air chamber pressure stabilizing structure and an air door baffle. In the prior art, the coal quality of the coal at the entrance is scattered, the span of the coal type is large, the heat load of a burner area is too high, potential safety hazards exist, and the air pressure in an air chamber is low due to the large arrangement distance of the burners, and when the combustion in a furnace is unstable, the design size of an air door baffle is large and the adjustment is not flexible. The utility model comprises the following components: the air door structure comprises a direct-current secondary air chamber (1), the direct-current secondary air chamber is of a Venturi-shaped necking structure, one end of the direct-current secondary air chamber is connected with a secondary air nozzle (3) through a pin shaft, a partition plate (5) is installed inside the direct-current secondary air chamber, the partition plate (4) of the secondary air chamber is fixedly connected with the partition plate through a blocking plate (6), an air door baffle plate (7) is arranged in a secondary air door (2), the air door baffle plate is connected with two ends of the secondary air door through a pin shaft (9), 2 limiting blocks (8) are respectively arranged on the partition plate, and a conical block (10) is installed inside the direct-current secondary air chamber. The utility model is used for the direct-current secondary air chamber pressure stabilizing structure and the air door baffle.
Description
Technical Field
The utility model relates to the technical field of combustion equipment, in particular to a direct-current secondary air chamber pressure stabilizing structure and an air door baffle.
Background
The large-scale thermal power plant boiler is classified according to the arrangement form of a combustion system and mainly comprises three forms of tangential firing, opposed firing and W flame firing, wherein a main burner pulverized coal nozzle and a secondary air nozzle of the tangential firing boiler are arranged in a crossed manner; meanwhile, the arrangement distance of the burners is large, so that the height of the secondary air chamber is high, the air pressure in the air chamber is low, when the combustion in the furnace is unstable, the negative pressure fluctuation of a hearth is easy to cause nozzle backfire, and the air box is burnt.
Disclosure of Invention
The utility model aims to provide a novel direct-current secondary air chamber pressure stabilizing structure and an air door baffle arrangement form, the structure is used for solving the problems that the negative pressure fluctuation of a hearth is easy to cause nozzle tempering, an air box is burnt, the baffle is not flexible to adjust, the air leakage amount of a low-load baffle is large and the like in the conventional secondary air chamber structure, and a reference scheme is provided for other similar situations.
The above purpose is realized by the following technical scheme:
a direct current secondary air chamber pressure stabilizing structure and an air door baffle comprise: the direct-current secondary air chamber is of a Venturi-shaped necking structure, one end of the direct-current secondary air chamber is connected with a secondary air nozzle through a pin shaft, a partition plate is arranged inside the direct-current secondary air chamber, the partition plate of the secondary air chamber and the partition plate are fixedly connected through a blocking plate, an air door baffle plate is arranged in the secondary air door, the air door baffle plate is connected with two ends of the secondary air door through the pin shaft, 2 limiting blocks are respectively arranged on the partition plate, a conical block is arranged inside the direct-current secondary air chamber, and the right end of the conical block is respectively connected with 2 pull rods.
The direct current secondary wind chamber pressure stabilizing structure and the air door baffle plate are arranged up and down, 2 the limiting blocks are arranged in a symmetrical mode relative to the vertical center of the pin shaft, the front lower part of the air door baffle plate is attached to the limiting block at the bottom, the back upper part of the air door baffle plate is attached to the limiting block at the upper part, and 2 the pull rods are arranged in parallel and penetrate through the side wall of the wind box wind channel.
Has the advantages that:
1. the utility model relates to a novel direct-current secondary air chamber pressure stabilizing structure and an air door baffle arrangement form, which are used for a secondary air distribution structure of a tangential firing boiler of a large-scale thermal power plant.
2. The utility model solves the problems that the secondary air volume is greatly reduced under the low-load operation condition of the boiler, and the secondary air speed provided by the conventional secondary air chamber structure is lower at the moment, so that the secondary air chamber structure is not beneficial to organizing an aerodynamic field in the boiler.
3. The adjustable conical block provided by the utility model is matched with a Venturi necking structure, the flow area of the secondary air chamber can be flexibly adjusted, the jet rigidity of secondary air is improved, the organization of an air power field in a furnace is facilitated, great benefits are provided for burning-out of pulverized coal or reducing nitrogen, and the risk that high-temperature pulverized coal-carrying flue gas enters the secondary air chamber in a back blowing manner can be eliminated.
4. The utility model reduces the size and the structure of the baffle plate of the secondary air door inlet, so that the baffle plate is more flexibly adjusted, the linear relation between the opening of the baffle plate and the air inlet quantity is better, particularly, when the boiler operates under low load, the opening of the baffle plate is smaller, and the small-size baffle plate can reduce the air leakage quantity, so that the actual air inlet quantity is closer to the design value.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a cross-sectional view a-a of fig. 1.
Wherein: 1. the device comprises a direct-current secondary air chamber, 2, a secondary air door, 3, a secondary air nozzle, 4, a secondary air chamber partition plate, 5, a partition plate, 6, a blocking plate, 7, an air door baffle plate, 8, a limiting block, 9, a rotating shaft, 10, a conical block, 11 and a pull rod.
The specific implementation mode is as follows:
example 1:
a direct current secondary air chamber pressure stabilizing structure and an air door baffle comprise: the air door structure comprises a direct-current secondary air chamber 1, wherein the direct-current secondary air chamber is of a Venturi-shaped necking structure, one end of the direct-current secondary air chamber is connected with a secondary air nozzle 3 through a pin shaft, a partition plate 5 is installed inside the direct-current secondary air chamber, a partition plate 4 of the secondary air chamber is fixedly connected with the partition plate through a blocking plate 6, an air door baffle 7 is arranged in the secondary air door 2, the air door baffle is connected with two ends of the secondary air door through a pin shaft 9, 2 limiting blocks 8 are respectively arranged on the partition plate, a conical block 10 is installed inside the direct-current secondary air chamber, and the right end of the conical block is respectively connected with 2 pull rods 11.
Example 2:
according to embodiment 1, 2 the limiting blocks are arranged up and down and are symmetrically arranged relative to the vertical center of the pin shaft, the lower part of the front surface of the air door baffle is attached to the limiting block at the bottom, the upper part of the back surface of the air door baffle is attached to the limiting block at the upper part, and 2 the pull rods are arranged in parallel and penetrate through the side wall of the air box air duct.
A throat structure similar to a Venturi form is designed in a secondary air chamber at the inlet end of a secondary air nozzle, the height of the inlet of an original secondary air chamber is reduced, a newly-added partition plate extends to the inlet of a secondary air door, and the partition plate of the original secondary air chamber and the newly-added partition plate are connected and fixed through a blocking plate;
the air door baffle is arranged in the secondary air door, is connected with two ends of the secondary air door through a pin shaft, drives the air door baffle to rotate through the pin shaft, controls the air intake of the secondary air, and is provided with a limiting block for limiting the position of the air door baffle when the secondary air door is completely closed;
the conical block can freely slide in the air chamber through the pull rod, the secondary air nozzle is fixed on the secondary air chamber in a pin shaft connection mode, and the nozzle is swung through a conventional swinging connection mechanism;
the required overgrate air of boiler buggy burning is distributed to each overgrate air door baffle entry by the overgrate air duct, flow into the secondary plenum through the air door baffle, and then jet into furnace and buggy through the overgrate air spout and mix, according to boiler operation load demand, adjustment overgrate air door baffle aperture, thereby adjustment overgrate air intake, simultaneously with the toper piece promote to the plenum throat position, further improve pressure head in the plenum, overgrate air efflux rigidity and prevent that the pressure fluctuation in the stove leads to high temperature area powder flue gas blowback to get into the secondary plenum when guaranteeing the low-load, boiler safety and stability moves when guaranteeing the low-load, this application is used for power plant boiler.
Claims (2)
1. A direct current secondary air chamber pressure stabilizing structure and an air door baffle comprise: the direct current secondary air chamber is characterized in that: the direct current secondary air chamber is of a Venturi-shaped necking structure, one end of the direct current secondary air chamber is connected with a secondary air nozzle through a pin shaft, a partition plate is arranged inside the direct current secondary air chamber, the partition plate of the secondary air chamber is fixedly connected with the partition plate through a blocking plate, an air door baffle is arranged in the secondary air door, the air door baffle is connected with two ends of the secondary air door through a pin shaft, 2 limiting blocks are arranged on the partition plate respectively, a conical block is arranged inside the direct current secondary air chamber, and the right end of the conical block is connected with 2 pull rods respectively.
2. The direct current secondary air chamber pressure stabilizing structure and the damper baffle plate of claim 1, wherein: 2 the stopper set up from top to bottom, and relative the perpendicular central symmetrical arrangement of round pin axle, the preceding below of air door baffle laminate with the stopper of bottom, air door baffle back top laminate with the stopper on upper portion, 2 pull rod parallel arrangement and pass the lateral wall in bellows wind channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122282730.3U CN215765196U (en) | 2021-09-22 | 2021-09-22 | Direct current secondary air chamber pressure stabilizing structure and air door baffle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122282730.3U CN215765196U (en) | 2021-09-22 | 2021-09-22 | Direct current secondary air chamber pressure stabilizing structure and air door baffle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215765196U true CN215765196U (en) | 2022-02-08 |
Family
ID=80089425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122282730.3U Expired - Fee Related CN215765196U (en) | 2021-09-22 | 2021-09-22 | Direct current secondary air chamber pressure stabilizing structure and air door baffle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215765196U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024060433A1 (en) * | 2022-09-21 | 2024-03-28 | 西安热工研究院有限公司 | Apparatus and method for optimizing aerodynamic field in furnace in deep adjustment mode |
-
2021
- 2021-09-22 CN CN202122282730.3U patent/CN215765196U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024060433A1 (en) * | 2022-09-21 | 2024-03-28 | 西安热工研究院有限公司 | Apparatus and method for optimizing aerodynamic field in furnace in deep adjustment mode |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220208 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |