CN110701632A - Anti-coking air device with air volume self-adaptive adjusting function - Google Patents
Anti-coking air device with air volume self-adaptive adjusting function Download PDFInfo
- Publication number
- CN110701632A CN110701632A CN201911053293.9A CN201911053293A CN110701632A CN 110701632 A CN110701632 A CN 110701632A CN 201911053293 A CN201911053293 A CN 201911053293A CN 110701632 A CN110701632 A CN 110701632A
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- Prior art keywords
- air
- coking
- wind
- nozzle
- scorching
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Classifications
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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
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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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
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
Abstract
The invention relates to a scorching air preventing device with an air volume self-adaptive adjusting function, which comprises a scorching air preventing baffle plate, a secondary air nozzle and an air box; one side of the air box is provided with a secondary air nozzle, and the bottom surface or the side surface of the secondary air nozzle is provided with a coke-proof air outlet; the anti-coking wind outlet is provided with an anti-coking wind baffle which is of a double-metal structure, one side of the anti-coking wind baffle close to air is a metal sheet with a smaller thermal expansion coefficient, and one side of the anti-coking wind baffle close to the flame of the boiler is a metal sheet with a larger thermal expansion coefficient. The invention has the beneficial effects that: the anti-coking wind blocking piece is of a bimetal structure with different thermal expansion coefficients, the air quantity is adjusted by depending on the deformation of the bimetal, the air quantity of the anti-coking wind is self-adaptively adjusted along with the temperature change near the nozzle of the burner, and when the temperature near the nozzle is lower, the anti-coking air quantity is very small; when the temperature near the nozzle is higher, the anti-coking air volume is increased; the invention has simple and reliable structure, no need of additional measurement and feedback components, no jamming and other phenomena, and low cost.
Description
Technical Field
The invention relates to the technical field of design and manufacture of boiler combustion equipment, in particular to a coke-preventing air device with an air volume self-adaptive adjusting function.
Background
When the pulverized coal fired boiler operates, the problem of coking of the heating surface of the boiler often occurs due to poor coal quality, operation fluctuation and other various reasons. Coking is caused by the impingement of hot, molten coal dust or ash particles onto a heated surface and therefore often occurs in high temperature regions near the burner ports.
To reduce boiler coking, one method is to feed a stream of air into the coking-prone zone. On the one hand, the combustion problem in the area can be reduced; on the other hand, the oxygen concentration can be increased, the ash melting point is increased, and the adhesiveness is reduced.
In the prior art, a coking-preventing air application means is adopted, for example, a small hole is formed in a water-cooled wall for feeding air, a small air port is additionally arranged near a secondary air nozzle, and the like, so that a certain coking-preventing effect is achieved. However, in these techniques, the air volume cannot be adjusted or the adjustment mechanism is too complicated although the adjustment is possible, and the air volume is likely to be locked in actual use.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a coke-preventing air device with an air volume self-adaptive adjusting function.
The anti-coking air device with the air volume self-adaptive adjusting function comprises an anti-coking air baffle plate, a secondary air nozzle and an air box; one side of the air box is provided with a secondary air nozzle, and the bottom surface or the side surface of the secondary air nozzle is provided with a coke-proof air outlet; the anti-coking wind outlet is provided with an anti-coking wind baffle which is of a double-metal structure, one side of the anti-coking wind baffle close to air is a metal sheet with a smaller thermal expansion coefficient, and one side of the anti-coking wind baffle close to the flame of the boiler is a metal sheet with a larger thermal expansion coefficient.
Preferably, the method comprises the following steps: the metal sheet with the smaller thermal expansion coefficient is carbon steel, and the metal sheet with the larger thermal expansion coefficient is copper.
Preferably, the method comprises the following steps: the area of the anti-coking wind blocking piece in a straight state is 1/4-1/3 of the area of the secondary wind nozzle.
Preferably, the method comprises the following steps: when the boiler is in a cold state or a low-load operation state, the anti-coking wind blocking piece is of a straight structure, and the anti-coking wind blocking piece blocks the anti-coking wind outlet; when the boiler is in a high-load operation state, the anti-coking wind blocking piece is of a bent structure, and a part of the anti-coking wind outlet is exposed.
Preferably, the method comprises the following steps: one end of the anti-scorching wind blocking sheet of the bending structure is fixed at the edge of the anti-scorching wind outlet, and the other end is separated from the anti-scorching wind outlet.
The invention has the beneficial effects that: the anti-coking wind blocking piece is of a bimetal structure with different thermal expansion coefficients, the air quantity is adjusted by depending on the deformation of the bimetal, the air quantity of the anti-coking wind is self-adaptively adjusted along with the temperature change near the nozzle of the burner, and when the temperature near the nozzle is lower, the anti-coking air quantity is very small; when the temperature near the nozzle is higher, the anti-coking air volume is increased. The invention has simple and reliable structure, no need of additional measurement and feedback components, no jamming and other phenomena, and low cost.
Drawings
FIG. 1 is a schematic diagram of a coke-preventing air device with an adaptive air volume adjusting function in a cold state;
FIG. 2 is a schematic cross-sectional view of a scorching wind shield;
FIG. 3 is a schematic diagram of a hot air preventing device with an adaptive air volume adjusting function;
fig. 4 is a schematic view in another direction of fig. 3.
Description of reference numerals: the anti-coking wind baffle plate comprises an anti-coking wind baffle plate 1, a metal sheet 1-1 with a small thermal expansion coefficient, a metal sheet 1-2 with a large thermal expansion coefficient, a secondary wind nozzle 2 and a wind box 3.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The anti-coking wind device with the air volume self-adaptive adjusting function comprises an anti-coking wind blocking piece 1, a secondary wind nozzle 2, a wind box 3, a metal sheet 1-1 with a small thermal expansion coefficient and a metal sheet 1-2 with a large thermal expansion coefficient. One side of the air box 3 is provided with a secondary air nozzle 2, the bottom surface or the side surface of the secondary air nozzle 2 is provided with a coke-proof air outlet, the coke-proof air outlet is provided with a coke-proof air baffle plate 1, the coke-proof air baffle plate 1 adopts a double-metal structure, one side of the coke-proof air baffle plate 1 close to air is a metal sheet 1-1 with a smaller thermal expansion coefficient, such as carbon steel, and one side of the coke-proof air baffle plate close to boiler flame is a metal sheet 1-2 with a larger thermal expansion coefficient, such as copper, as.
The area of the anti-coking wind baffle plate 1 is about 1/4-1/3 of the area of the secondary air nozzle 2.
Under different operation states of the boiler, the anti-coking air baffle plate 1 has different forms, and the self-adaptive adjustment of the anti-coking air quantity is realized. In a cold state or a low load state, the anti-coking wind blocking piece 1 is in a straight state and basically blocks an anti-coking wind outlet, as shown in figure 1; when the load is high, the combustion temperature of the area near the secondary air is high, the anti-coking air baffle plate 1 is bent due to different thermal expansion coefficients of the two metal materials, the exposed area of the anti-coking air outlet is increased, and as shown in fig. 3 and 4, certain anti-coking air is sprayed into the area, so that the risk of coking is reduced.
Claims (5)
1. The utility model provides a prevent burnt wind device with amount of wind self-adaptation regulatory function which characterized in that: comprises a scorching wind prevention baffle plate (1), a secondary wind nozzle (2) and a wind box (3); one side of the air box (3) is provided with a secondary air nozzle (2), and the bottom surface or the side surface of the secondary air nozzle (2) is provided with a coking-proof air outlet; the anti-coking wind outlet is provided with an anti-coking wind baffle (1), the anti-coking wind baffle (1) is of a double-metal structure, one side of the anti-coking wind baffle close to air is a metal sheet (1-1) with a smaller thermal expansion coefficient, and one side of the anti-coking wind baffle close to boiler flame is a metal sheet (1-2) with a larger thermal expansion coefficient.
2. The anti-scorching device with the air volume adaptive adjusting function according to claim 1, characterized in that: the metal sheet (1-1) with the smaller thermal expansion coefficient is carbon steel, and the metal sheet (1-2) with the larger thermal expansion coefficient is copper.
3. The anti-scorching device with the air volume adaptive adjusting function according to claim 1, characterized in that: the area of the anti-scorching wind blocking sheet (1) in a straight state is 1/4-1/3 of the area of the secondary wind nozzle (2).
4. The anti-scorching device with the air volume adaptive adjusting function according to claim 1, characterized in that: when the boiler is in a cold state or a low-load operation state, the anti-coking air blocking piece (1) is in a straight structure, and the anti-coking air blocking piece (1) blocks the anti-coking air outlet; when the boiler is in a high-load operation state, the anti-coking wind blocking piece (1) is of a bent structure, and a part of the anti-coking wind outlet is exposed.
5. The anti-scorching device with adaptive air volume adjusting function according to claim 4, wherein: one end of the anti-scorching wind blocking piece (1) with the bending structure is fixed at the edge of the anti-scorching wind outlet, and the other end is separated from the anti-scorching wind outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911053293.9A CN110701632A (en) | 2019-10-31 | 2019-10-31 | Anti-coking air device with air volume self-adaptive adjusting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911053293.9A CN110701632A (en) | 2019-10-31 | 2019-10-31 | Anti-coking air device with air volume self-adaptive adjusting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110701632A true CN110701632A (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911053293.9A Pending CN110701632A (en) | 2019-10-31 | 2019-10-31 | Anti-coking air device with air volume self-adaptive adjusting function |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734828A (en) * | 2012-06-04 | 2012-10-17 | 哈尔滨润河科技有限公司 | Sector plate regulator of rotary air preheater |
| KR20140106316A (en) * | 2013-02-26 | 2014-09-03 | 두산중공업 주식회사 | Cooling structure of combustor liner for gas turbine |
| CN203980331U (en) * | 2014-07-14 | 2014-12-03 | 东方电气集团东方锅炉股份有限公司 | Prevent the anti-scorch wind system of four jiaos of serious cokings of " W " stove |
| CN107289488A (en) * | 2015-10-28 | 2017-10-24 | 金仁均 | Gas-cooker abat-vent |
| CN210979907U (en) * | 2019-10-31 | 2020-07-10 | 浙江浙能技术研究院有限公司 | Anti-coking air device with air volume self-adaptive adjusting function |
-
2019
- 2019-10-31 CN CN201911053293.9A patent/CN110701632A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734828A (en) * | 2012-06-04 | 2012-10-17 | 哈尔滨润河科技有限公司 | Sector plate regulator of rotary air preheater |
| KR20140106316A (en) * | 2013-02-26 | 2014-09-03 | 두산중공업 주식회사 | Cooling structure of combustor liner for gas turbine |
| CN203980331U (en) * | 2014-07-14 | 2014-12-03 | 东方电气集团东方锅炉股份有限公司 | Prevent the anti-scorch wind system of four jiaos of serious cokings of " W " stove |
| CN107289488A (en) * | 2015-10-28 | 2017-10-24 | 金仁均 | Gas-cooker abat-vent |
| CN210979907U (en) * | 2019-10-31 | 2020-07-10 | 浙江浙能技术研究院有限公司 | Anti-coking air device with air volume self-adaptive adjusting function |
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