CN216114136U - Heat reflux device for changing air environment of air preheater - Google Patents
Heat reflux device for changing air environment of air preheater Download PDFInfo
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- CN216114136U CN216114136U CN202122669464.XU CN202122669464U CN216114136U CN 216114136 U CN216114136 U CN 216114136U CN 202122669464 U CN202122669464 U CN 202122669464U CN 216114136 U CN216114136 U CN 216114136U
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- hot air
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- preheater
- air preheater
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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
- Y02E20/34—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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Abstract
A hot reflux unit for changing the air environment of air preheater features that a hot air bypass is arranged between hot air outlet and the hood of suction tube; cold air enters the air blower from the outside after entering the air suction barrel through the grid net, enters the air preheater after being pressurized by the fan, exchanges heat with flue gas in the air preheater to heat, and the hot air after heat exchange and temperature rise exits the air preheater. The device can improve the air inlet temperature of the air preheater, prevent the low-temperature area of the air preheater from generating dew point corrosion, protect the air preheater, prolong the service life of the air preheater and reduce the manufacturing cost of the air preheater.
Description
Technical Field
The utility model belongs to the technical field of air preheaters, and relates to a hot reflux device for changing the air environment of an air preheater.
Background
The heating furnace is the main energy consumption equipment of oil refining enterprises, reduces the consumption of fuel, improves the heat efficiency of the heating furnace, can reduce energy consumption and reduce carbon emission. At present, an air preheater is mainly adopted to recover the heat of flue gas and preheat combustion air so as to improve the heat efficiency of the heating furnace. In northern areas, the air temperature is low in winter, when cold air just enters the air preheater, the temperature of an inlet heat exchange surface of the air preheater is reduced to the dew point corrosion temperature, so that the air preheater is corroded, a plurality of similar corrosion cases occur in actual engineering practice, and other parts of the air preheater are intact. There are two solutions in the current project:
the first is that the cold air is heated by a heat source before entering the air preheater;
the second way is to use a relatively corrosion-resistant material as the heat exchange surface in the low temperature region.
The first mode increases energy consumption, and is contrary to the existing energy conservation, emission reduction and carbon emission reduction; the second mode does not fundamentally solve the corrosion problem, also improves the manufacturing cost of equipment, has potential safety hazard and is poor in economy.
SUMMERY OF THE UTILITY MODEL
The present invention has been made to overcome the above problems, and provides a hot return apparatus for changing an air environment of an air preheater.
The technical scheme of the utility model is as follows:
a hot reflux device for changing the air environment of an air preheater comprises an air preheater 1, a hot air bypass 2, a hot air bypass valve 3, a fan 5, a hot air nozzle 6, a grid net 8 and an air suction cylinder 9; a hot air bypass 2 is arranged between the hot air outlet and the wind cap of the air suction barrel, and a hot air bypass valve 3 is arranged on the hot air bypass 2 and used for adjusting the amount of hot air.
Cold air enters the air suction barrel 9 from the outside through the grid net and then enters the fan 5, the cold air enters the air preheater 1 after being pressurized by the fan 5, the cold air and flue gas exchange heat in the air preheater 1 to be heated, and hot air after heat exchange and heating is discharged out of the air preheater 1.
The end of the air suction barrel 9 is provided with a hot air nozzle 6, hot air is diffused to the periphery through the hot air nozzle 6, and therefore the grid net 8 is heated, and the grid net is not frozen in winter.
Further characterized in that the hot air bypass 2 is provided with a metal corrugated expansion joint 4 for absorbing expansion and contraction caused by temperature change of the hot air bypass 2.
Further characterized in that the hot air bypass 2 and the suction cylinder 9 are provided with heat preservation facilities.
The novel hot air blower is further characterized by further comprising a hood 7, wherein the hood 7 is hollow, and hot air from the hot air blower 5 enters the hood 7 and passes through the interior of the hood 7 to hot air nozzles 6 around the hood 7.
The beneficial effect of this device is: the device can improve the air inlet temperature of the air preheater, prevent the low-temperature area of the air preheater from generating dew point corrosion, protect the air preheater, prolong the service life of the air preheater and reduce the manufacturing cost of the air preheater.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a side view of the present invention.
Fig. 3 is a partial view of the hood.
In the figure: 1. an air preheater; 2. a hot air bypass; 3. a hot air bypass valve; 4. a corrugated expansion joint; 5. a fan; 6. a hot air nozzle; 7. a hood; 8. a grid net; 9. an air suction cylinder.
Detailed Description
The following is further described with reference to the accompanying drawings.
As shown in fig. 1 and 2, a hot return apparatus for changing an air environment of an air preheater mainly comprises: the air preheater 1, hot-air bypass 2, hot-air bypass valve 3, ripple expansion joint 4, fan 5, hot-air spout 6, hood 7, grid net 8, aspiration channel 9 constitute. Cold air enters the air suction barrel 9 from the outside through the grille net 7 and then enters the fan 5, enters the air preheater 1 after being pressurized by the fan, and exchanges heat with flue gas in the air preheater 1 to be heated, and hot air after heat exchange and heating is discharged from the air preheater. A hot air bypass 2 is arranged between a hot air outlet and an air suction barrel hood, a hot air bypass valve 3 is arranged on the hot air bypass to adjust the amount of hot air, a metal corrugated expansion joint 4 is arranged on the hot air bypass, and a hot air nozzle 6 is arranged at the end of the hot air bypass air suction barrel. When the temperature of the air preheater is low, in order to prevent the air preheater from being corroded, the hot air bypass valve 3 is gradually opened, hot air flows to the air suction cylinder through the hot air bypass, the hot air heats the grid net 8 through the hot air nozzle 6, the grid net is not frozen, cold air and hot backflow air are mixed in the air suction cylinder 9 to be at an appropriate temperature, and the mixed air is sent to the air preheater through the fan 5, so that dew point corrosion of a low-temperature area of the air preheater is prevented. The hot air bypass and the blast cap are both provided with heat preservation.
Claims (5)
1. A hot reflux device for changing the air environment of an air preheater is characterized by comprising an air preheater (1), a hot air bypass (2), a hot air bypass valve (3), a fan (5), a hot air nozzle (6), a grid net (8) and an air suction cylinder (9);
a hot air bypass (2) is arranged between the hot air outlet and the wind cap of the suction barrel, and a hot air bypass valve (3) is arranged on the hot air bypass (2) and used for adjusting the amount of hot air;
cold air enters an air suction barrel (9) from the outside through a grid net and then enters a fan (5), the cold air enters an air preheater (1) after being pressurized by the fan (5), the cold air exchanges heat with flue gas in the air preheater (1) to be heated, and hot air after heat exchange and temperature rise is discharged out of the air preheater (1);
the hot air nozzle (6) is arranged at the end of the air suction barrel (9), and hot air is diffused to the periphery through the hot air nozzle (6), so that the grid net (8) is heated, and the grid net is not frozen in winter.
2. A heat recovery apparatus for changing air environment of an air preheater according to claim 1, wherein the hot air bypass (2) is provided with a metal bellows expansion joint (4) for absorbing an expansion and contraction amount generated by a temperature change of the hot air bypass (2).
3. A hot return arrangement for changing the air environment of an air preheater according to claim 1 or 2, characterized in that both the hot air bypass (2) and the suction funnel (9) are provided with insulation.
4. A hot air return device for changing the air environment of an air preheater according to claim 1 or 2, characterized in that a wind cap (7) is further provided, the wind cap (7) is hollow, and hot air from the fan (5) enters the interior of the wind cap (7) and passes through the interior of the wind cap (7) to the hot air nozzles (6) around the wind cap (7).
5. A hot air return device for changing the air environment of an air preheater according to claim 3, characterized in that a wind cap (7) is further provided, the wind cap (7) is hollow, and hot air from the fan (5) enters the interior of the wind cap (7) and passes through the interior of the wind cap (7) to the hot air nozzles (6) around the wind cap (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122669464.XU CN216114136U (en) | 2021-11-03 | 2021-11-03 | Heat reflux device for changing air environment of air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122669464.XU CN216114136U (en) | 2021-11-03 | 2021-11-03 | Heat reflux device for changing air environment of air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216114136U true CN216114136U (en) | 2022-03-22 |
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ID=80712603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122669464.XU Active CN216114136U (en) | 2021-11-03 | 2021-11-03 | Heat reflux device for changing air environment of air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216114136U (en) |
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2021
- 2021-11-03 CN CN202122669464.XU patent/CN216114136U/en active Active
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