CN221076520U - Sealing device for air preheater - Google Patents
Sealing device for air preheater Download PDFInfo
- Publication number
- CN221076520U CN221076520U CN202322734688.3U CN202322734688U CN221076520U CN 221076520 U CN221076520 U CN 221076520U CN 202322734688 U CN202322734688 U CN 202322734688U CN 221076520 U CN221076520 U CN 221076520U
- Authority
- CN
- China
- Prior art keywords
- air
- leakage pipe
- primary
- flue gas
- air leakage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007789 sealing Methods 0.000 title claims abstract description 22
- 239000003546 flue gas Substances 0.000 claims abstract description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical group [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000005192 partition Methods 0.000 claims abstract description 13
- 239000000779 smoke Substances 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Air Supply (AREA)
Abstract
The utility model belongs to the technical field of air pre-heaters, and relates to an air pre-heater sealing device, which comprises a body, an air leakage pipe and a secondary air blower, wherein a first partition plate is arranged in the axial direction of the body and divides the body into adjacent flue gas sides and air sides; the flue gas side, the wind side and the body are the same in axial direction; the two ends of the wind side are respectively provided with an air inlet and an air outlet; one end of the air leakage pipe is positioned at the air outlet end and is communicated with the joint of the air side and the flue gas side; the other end of the air leakage pipe is communicated with the air inlet through a secondary air blower. The air preheater sealing device greatly reduces the air leakage rate, saves energy and reduces consumption, and ensures normal production operation.
Description
Technical Field
The utility model belongs to the technical field of air pre-heaters, and relates to a sealing device of an air pre-heater.
Background
The air preheater (air preheater for short) is a heating surface for preheating air before entering a boiler to a certain temperature by flue gas in a tail flue of the boiler through internal cooling fins, and is equipment for improving the heat exchange performance of the boiler and reducing energy consumption. However, in the operation process of the existing air preheater, due to the pressure difference between the flue gas side and the wind side, air on the wind side leaks air to a certain extent, the leaked air can be dissipated to the flue gas side, the influence is not great in a short time, but as the operation time of the air preheater is prolonged, the air leakage degree of the wind side is prolonged, the air leakage quantity of the wind side is increased, the oxygen quantity required by a boiler is reduced, the heat efficiency of the boiler is seriously reduced, the energy consumption of the boiler is increased, and even when the air leakage is serious, shutdown maintenance is needed, so that the normal operation of production is influenced; in addition, the air leakage leads to the increase of the air flow from the air side to the flue gas side, the flow velocity becomes large, the service life of the parts easy to wear is shortened, and the maintenance cost is high.
Disclosure of utility model
Aiming at the technical problem of large air leakage degree of the existing air preheater, the utility model provides the air preheater sealing device, which greatly reduces the air leakage rate, saves energy and reduces consumption and ensures normal production operation.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
The air preheater sealing device comprises a body, an air leakage pipe and a secondary air blower, wherein a first partition plate is arranged in the axial direction of the body and divides the body into adjacent flue gas sides and air sides; the flue gas side, the wind side and the body are the same in axial direction; the two ends of the wind side are respectively provided with an air inlet and an air outlet; one end of the air leakage pipe is positioned at the air outlet end and is communicated with the junction of the air side and the flue gas side; the other end of the air leakage pipe is communicated with the air inlet through a secondary air blower.
Further defined, a second partition is disposed axially within the wind side, the second partition dividing the wind side into adjacent primary and secondary wind sides; the primary air side, the secondary air side and the flue gas side are axially the same; the two ends of the primary air side are respectively provided with a primary air inlet and a primary air outlet; two ends of the primary air side are respectively provided with a secondary air inlet and a secondary air outlet, and the air leakage pipe comprises a primary air leakage pipe; one end of the primary air leakage pipe is communicated with the joint of the primary air side and the smoke side; the other end of the primary air leakage pipe is communicated with a secondary air inlet.
Further defined, a primary valve is arranged on the primary air leakage pipe.
Further defined, the air leakage pipe further comprises a secondary air leakage pipe; one end of the secondary air leakage pipe is communicated with the joint of the secondary air side and the smoke side; the other end of the secondary air leakage pipe is communicated with a secondary air inlet.
Further defined, a secondary valve is arranged on the secondary air leakage pipe.
Further defined, the air preheater sealing apparatus further comprises a secondary cool air duct in communication with the secondary air inlet; the primary air leakage pipe and the secondary air leakage pipe are communicated with the secondary cold air pipe.
Further defined, a secondary air fan is disposed on the secondary cool air duct.
Further defined, the air preheater sealing device further comprises pressure gauges disposed on the input end of the flue gas side and the output end of the flue gas side, respectively.
The utility model has the beneficial effects that:
1. The air leakage pipe is used for splitting the air at the junction of the air side and the smoke side of the air preheater, and the air at the hot end of the air side is split to the inlet of the secondary air blower, so that the leaked air is returned to the air preheater body again, the air leakage rate is greatly reduced, and the normal operation of production is ensured; the heat efficiency of the boiler is improved, meanwhile, hot air leaked from the wind side is reused, and energy conservation and consumption reduction are realized.
2. According to the utility model, the opening and the closing of the air leakage pipe are respectively controlled through the primary valve and the secondary valve, meanwhile, the pressure gauges are respectively arranged at the input end and the output end of the smoke side, and the opening or the closing of the primary valve and the secondary valve is controlled through the pressure difference of the smoke side, so that the operation is practical and flexible.
Drawings
FIG. 1 is a diagram of a sealing device provided by the present utility model;
Wherein:
1-a body; 2-flue gas side; 3-primary wind side; 4-secondary air side; 5-primary air leakage pipe; 6-a primary valve; 7-a secondary air leakage pipe; 8-a secondary valve; 9-a secondary air blower.
Detailed Description
The present utility model will now be further described with reference to the accompanying drawings and examples, but the present utility model is not limited to the embodiments, and any substitutions or modifications made within the technical spirit of the present utility model are within the scope of the present utility model.
Referring to fig. 1, an air preheater sealing device comprises a body 1 and an air leakage pipe, wherein a first partition plate is arranged in the axial direction of the body 1 and divides the body 1 into adjacent flue gas sides 2 and air sides; the flue gas side 2, the wind side and the body 1 are axially the same; the two ends of the wind side are respectively provided with an air inlet and an air outlet; one end of the air leakage pipe is positioned at the air outlet end and is communicated with the junction of the air side and the smoke side 2; the other end of the air leakage pipe is communicated with the air inlet.
The air preheater sealing device also comprises a secondary air blower 9, and the other end of the air leakage pipe is communicated with an air inlet through the secondary air blower 9.
Specifically, a second partition plate is arranged in the axial direction in the wind side, and divides the wind side into a primary wind side 3 and a secondary wind side 4 which are adjacent; the primary air side 3, the secondary air side 4 and the flue gas side 2 are axially identical.
Specifically, the body 1 of air preheater is cylindrical tube structure, and inside is first through first baffle (big baffle) divide into two adjacent regions with body 1 earlier, and one is flue gas side 2, and another is the wind side, and specifically, first baffle is located body 1 axial direction, and is connected with body 1 lateral wall, and flue gas side 2 and wind side are because first baffle effect, do not communicate each other in body 1. The upper end of the wind side is an air outlet (hot air end), the lower end of the wind side is an air inlet (cold air end), the air flows in the wind side, the upper part of the smoke side 2 is a smoke inlet (hot end), the lower part of the smoke side 2 is a smoke outlet (cold end), and the interior of the smoke side 2 is hot smoke; the hot flue gas flows from top to bottom, and the cold air at the wind side flows from bottom to top, and the cold air is preheated by utilizing the heat of the flue gas.
Further, a second partition (small partition) is provided in the wind side region, and this second partition is located in the axial direction of the body 1, and one end is communicated with the side wall of the body 1, and the other end is connected with the first partition, thereby dividing the wind side into a primary wind side 3 and a secondary wind side 4 adjacent to each other. The two ends of the primary air side 3 are respectively provided with a primary air inlet (cold air end) and a primary air outlet (hot air end); the secondary air side 4 is provided with a secondary air inlet (cold air end) and a secondary air outlet (hot air end) at both ends.
The air preheater sealing device also comprises a cold air main pipe, wherein the cold air main pipe is divided into two paths, namely a primary cold air pipe and a secondary cold air pipe; the primary cold air pipe is communicated with a primary air inlet of the primary air side 3, the secondary cold air pipe is communicated with a secondary air inlet of the secondary air side 4, and in particular, the secondary cold air pipe is communicated with a secondary air inlet of the secondary air side 4 through a secondary air fan 9.
In order to reduce the air leakage rate, the air leakage pipe comprises a primary air leakage pipe 5; one end of the primary air leakage pipe 5 is communicated with the joint of the primary air side 3 and the smoke side 2; the other end of the primary air leakage pipe 5 is communicated with a secondary air inlet.
Further, the air leakage pipe also comprises a secondary air leakage pipe 7, and one end of the secondary air leakage pipe 7 is communicated with the joint of the secondary air side 4 and the flue gas side 2; the other end of the secondary air leakage pipe 7 is communicated with a secondary air inlet.
Preferably, the primary air leakage pipe 5 is arranged in parallel with the secondary air leakage pipe 7.
The air leakage collected by the primary air leakage pipe 5 and the secondary air leakage pipe 7 is collected in the secondary air pipe, and enters the secondary air side 4 from the secondary air inlet through the secondary air pipe and the secondary air fan 9.
In order to facilitate the control of the opening and closing of the air leakage pipe, a primary valve 6 is arranged on the primary air leakage pipe 5. The secondary air leakage pipe 7 is provided with a secondary valve 8.
The air preheater sealing device further comprises pressure gauges arranged on the input end of the flue gas side 2 and the output end of the flue gas side 2, respectively.
When the sealing device is implemented, through the pressure gauge on the input end of the smoke side 2 and the pressure gauge on the output end of the smoke side 2, when the pressure difference of the smoke side 2 in and out fluctuates and the fluctuation value is more than 1200Pa, the primary valve 6 or the secondary valve 8 is opened, the corresponding air leakage pipe is opened, hot air leaked from the air side is converged into the secondary cold air pipe through the air leakage pipe and reenters the secondary air side, and when the pressure difference of the smoke side 2 in and out is stable at 1220Pa, the air leakage pipe is closed; thereby effectively reducing the air leakage rate, improving the thermal efficiency of the boiler and ensuring the normal operation of the air preheater; meanwhile, the flow rate from the air side leakage to the flue gas side is reduced, the flow rate is reduced, the service life of the easily worn part is prolonged, the maintenance cost is low, and the energy conservation and consumption reduction are realized.
Claims (7)
1. The air preheater sealing device is characterized by comprising a body (1), an air leakage pipe and a secondary air blower (9), wherein a first partition plate is arranged in the axial direction of the body (1) and divides the body (1) into adjacent flue gas sides (2) and air sides; the flue gas side (2), the wind side and the body (1) are axially the same; the two ends of the wind side are respectively provided with an air inlet and an air outlet; one end of the air leakage pipe is positioned at the air outlet end and is communicated with the junction of the air side and the flue gas side (2); the other end of the air leakage pipe is communicated with an air inlet through a secondary air blower (9).
2. An air preheater sealing apparatus according to claim 1, wherein a second partition is arranged axially in the wind side, the second partition dividing the wind side into adjacent primary (3) and secondary (4) wind sides; the primary air side (3), the secondary air side (4) and the flue gas side (2) are axially identical; the two ends of the primary air side (3) are respectively provided with a primary air inlet and a primary air outlet; two ends of the secondary air side (4) are respectively provided with a secondary air inlet and a secondary air outlet, and the air leakage pipe comprises a primary air leakage pipe (5); one end of the primary air leakage pipe (5) is communicated with the joint of the primary air side (3) and the smoke side (2); the other end of the primary air leakage pipe (5) is communicated with the secondary air blower (9).
3. The air preheater sealing device according to claim 2, wherein a primary valve (6) is arranged on the primary air leakage pipe (5).
4. An air preheater sealing device according to claim 3, wherein the air leakage duct further comprises a secondary air leakage duct (7); one end of the secondary air leakage pipe (7) is communicated with the joint of the secondary air side (4) and the smoke side (2); the other end of the secondary air leakage pipe (7) is communicated with a secondary air blower (9).
5. The air preheater sealing device according to claim 4, wherein a secondary valve (8) is arranged on the secondary air leakage pipe (7).
6. The air preheater sealing device according to claim 5, further comprising a secondary cool air duct which is in communication with the secondary air blower (9), the primary air leakage duct (5) and the secondary air leakage duct (7).
7. Air preheater sealing device according to any one of claims 1-6, further comprising pressure gauges arranged on the input end of the flue gas side (2) and on the output end of the flue gas side (2), respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322734688.3U CN221076520U (en) | 2023-10-11 | 2023-10-11 | Sealing device for air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322734688.3U CN221076520U (en) | 2023-10-11 | 2023-10-11 | Sealing device for air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221076520U true CN221076520U (en) | 2024-06-04 |
Family
ID=91263890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322734688.3U Active CN221076520U (en) | 2023-10-11 | 2023-10-11 | Sealing device for air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221076520U (en) |
-
2023
- 2023-10-11 CN CN202322734688.3U patent/CN221076520U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |