CN215638864U - Aluminum melting protection flue gas purification and recovery system - Google Patents
Aluminum melting protection flue gas purification and recovery system Download PDFInfo
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- CN215638864U CN215638864U CN202121298589.XU CN202121298589U CN215638864U CN 215638864 U CN215638864 U CN 215638864U CN 202121298589 U CN202121298589 U CN 202121298589U CN 215638864 U CN215638864 U CN 215638864U
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Abstract
A system for purifying and recovering aluminum melting protection flue gas comprises an aluminum melting furnace, a flue connected with a hearth and a furnace door of the aluminum melting furnace; a dust remover, a heat exchanger and a variable frequency induced draft fan are connected to the flue in sequence; the pressure sensor is connected with the variable-frequency induced draft fan through the control unit and used for controlling the negative pressure in the flue; and the temperature sensors are arranged at two ends of the heat exchanger and are connected with a circulating pump of the heat exchanger through a control unit for controlling the flow of heat exchange media in the heat exchanger. The utility model can automatically reduce the rotating speed of the circulating pump according to the temperature change of the heat exchanger, and prevent the corrosive gas contained in the protective flue gas from damaging the heat exchanger due to dew point corrosion. The utility model can also automatically realize the stabilization of negative pressure in the flue, solves the problem that the intermittent opening of the furnace door brings pressure fluctuation to the hearth and the heat exchanger, can reduce the heat energy loss of the hearth as much as possible under the condition of not reducing the dust removal effect, and reduces the production cost.
Description
Technical Field
The utility model relates to the technical field of aluminum processing, in particular to an aluminum melting protection flue gas purification and recovery system.
Background
During the production process of aluminum smelting, a large amount of high-temperature protective flue gas is generated in a hearth, the temperature of the protective flue gas reaches 600 ℃, and the particle concentration far exceeds the emission limit value specified by the state. When the furnace door is opened during slag skimming and refining, part of protective flue gas overflows from the furnace door, and the temperature of the protective flue gas is generally not more than 80 ℃ due to mixing with outside air. According to the requirements of energy conservation and environmental protection, dust particles in the flue gas are protected to be removed, and heat energy in the flue gas is protected to be recycled.
The existing protective flue gas dust removal device for the aluminum melting furnace is characterized in that a smoke suction hood is arranged at a furnace door, protective flue gas overflowing from the furnace door is discharged into a flue of a hearth through the smoke suction hood, and then dust removal treatment and heat energy recovery in the later period are carried out together. Generally, a draught fan is installed in a flue, negative pressure generated by the draught fan cannot be too large, and the heat energy loss of a hearth is too large due to the fact that the negative pressure is too large; the negative pressure cannot be too small, and the dust removal effect is poor if the negative pressure is too small. In order to collect the protective smoke overflowing from the oven door completely, a smoke exhaust fan is usually installed in the smoke exhaust hood. The smoke exhaust fan not only can exhaust the protection smoke into the flue, but also can exhaust a large amount of outside air into the flue, thereby greatly reducing the temperature of the protection smoke in the flue. The main problems of the method are as follows:
1. in industrial production, a heat exchanger is often adopted as a heat energy recovery device, corrosive gas is protected from being contained in flue gas, and dew point corrosion is generated on the heat exchanger due to cold and hot changes of the flue gas, so that the heat exchanger is damaged;
2. the furnace door and the smoke exhaust fan are intermittently opened, and pressure fluctuation is brought to the hearth and the heat exchanger when the furnace door and the smoke exhaust fan are opened each time, so that the energy consumption of the smelting furnace is increased, and the heat exchange efficiency of the heat exchanger is reduced;
3. aluminum smelting is generally multi-furnace production, but the number of furnaces opened at each time is changed according to the smelting amount, and the pressure and the temperature of protective flue gas in a flue are influenced.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the background art, the utility model discloses an aluminum melting protection flue gas purification and recovery system.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
a system for purifying and recovering aluminum melting protection flue gas comprises an aluminum melting furnace, a flue connected with a hearth and a furnace door of the aluminum melting furnace; a dust remover, a heat exchanger and a variable frequency induced draft fan are connected to the flue in sequence; the pressure sensor is connected with the variable-frequency induced draft fan through the control unit and used for controlling the negative pressure in the flue; and the temperature sensors are arranged at two ends of the heat exchanger and are connected with a circulating pump of the heat exchanger through a control unit for controlling the flow of heat exchange media in the heat exchanger.
The technical scheme is further improved, and the dust remover is a metal fiber filter bag dust remover.
The technical scheme is further improved, the metal fiber filter bag dust remover is connected with a compressed air dust cleaning device and a pressure difference transmitter, and the pressure difference transmitter is connected with the compressed air dust cleaning device.
The technical scheme is further improved, and the film-coated polyester fiber filter bag dust remover is connected with a timing dust cleaning device.
Further improves the technical scheme that the control unit is connected with the circulating pump through a PID controller.
Further improves the technical proposal that a valve is arranged on the flue.
Compared with the background technology, the utility model has the following beneficial effects:
1. the utility model can automatically reduce the rotating speed of the circulating pump according to the temperature change of the heat exchanger, and can automatically reduce the flow of the heat exchange medium when the temperature of the outlet end of the heat exchanger is close to the dew point, thereby improving the temperature of the outlet end of the heat exchanger and preventing corrosive gas contained in the protective flue gas from damaging the heat exchanger due to dew point corrosion.
2. The utility model can automatically realize the stabilization of negative pressure in the flue, can reduce the heat energy loss of the hearth as much as possible under the condition of not reducing the dust removal effect, and can reduce the production cost.
3. The utility model solves the problems that the intermittent opening of the furnace door and the smoke exhaust fan brings pressure fluctuation to the hearth and the heat exchanger, the pressure and the temperature of the smoke in the flue are protected, and the pressure and the temperature cannot be changed due to the opening condition of each aluminum smelting furnace.
The smoke emission concentration of the utility model is lower than the emission limit specified by the state and the place, thereby greatly reducing the environmental pollution; the utility model has high waste heat recovery efficiency and improves the comprehensive utilization rate of energy. The utility model has higher environmental protection benefit and economic benefit.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. an aluminum melting furnace; 2. a flue; 3. a dust remover; 4. a heat exchanger; 5. a variable-frequency induced draft fan; 6. a chimney; 7. a pressure sensor; 8. an inlet end temperature sensor; 9. an outlet end temperature sensor; 10. a circulation pump; 11. a heat-using device; 12. a valve; 13. a furnace door smoke hood; 14. a compressed air ash removal device; 15. and a differential pressure transmitter.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "front", "rear", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
An aluminum melting protection flue gas purification and recovery system comprises three aluminum melting furnaces 1 connected in parallel and a flue 2 connected with hearths and furnace doors of the three aluminum melting furnaces 1, as shown in figure 1. The flue 2 is connected with a dust remover 3, a heat exchanger 4 and a variable frequency draught fan 5 in sequence, and the protective flue gas enters a chimney 6 for evacuation after passing through the device. The structure and function of which are explained in detail below.
The dust collector 3 is used for dust removal. Because the temperature of the protective flue gas is as high as 600 ℃, the dust remover 3 adopts a high-temperature resistant metal fiber filter bag dust remover which can bear the temperature of more than 800 ℃, the dust removal efficiency is 99.9 percent, and the emission concentration is less than or equal to 10mg/m3. In order to prevent dust from blocking the metal fiber filter bag, a compressed air dust cleaning device 14 and a pressure difference transmitter 15 are installed on the metal fiber filter bag dust remover, when the pressure difference transmitter 15 detects that the pressure difference at the inlet and the outlet of the metal fiber filter bag dust remover exceeds the limit value, the pressure difference transmitter 15 controls the compressed air dust cleaning device 14 to clean the metal fiber filter bag, and the cleaned dust is periodically discharged through a dust discharge valve.
The heat exchanger 4 is used for recovering and protecting heat energy in the flue gas. The protection flue gas enters from the air inlet end of the heat exchanger 4 and then flows out from the air outlet end of the heat exchanger 4. The heat utilization equipment 11 is connected with the heat exchanger 4 through the circulating pump 10 and the heat exchange medium and is used for absorbing and protecting heat energy in the flue gas. After heat exchange is carried out by the heat exchanger 4, the temperature of the air outlet end of the heat exchanger 4 is reduced to about 100 ℃.
In order to overcome the defects in the prior art, independent valves 12 are arranged on each flue 2 and each furnace door smoke hood 13, and when one aluminum smelting furnace 1 does not work, the corresponding valve 12 is closed, so that the pressure and the temperature of the protective smoke in the flue 2 cannot be influenced.
A pressure sensor 7 is installed on the flue 2, and the pressure sensor 7 is connected with a variable-frequency induced draft fan 5 through a control unit and used for controlling negative pressure in the flue 2. When the furnace door is intermittently opened, the negative pressure in the flue 2 changes, and the rotating speed of the variable-frequency induced draft fan 5 correspondingly changes under the control of the control unit, so that the negative pressure in the flue 2 is kept stable. The negative pressure is stable, the heat loss of the hearth can be reduced as much as possible under the condition that the dust removal effect is not reduced, and the production cost is reduced.
An inlet end temperature sensor 8 and an outlet end temperature sensor 9 are installed at two ends of the heat exchanger 4, and the temperature sensors are connected with a circulating pump 10 of the heat exchanger 4 through a control unit and used for controlling the flow of heat exchange media in the heat exchanger 4. When the temperature at the two ends of the heat exchanger 4 changes, especially when the temperature of the temperature sensor 9 at the outlet end is reduced to the dew point, the control unit reduces the rotating speed of the circulating pump 10 through the PID controller, so that the flow of the heat exchange medium is reduced, the temperature of the gas outlet end of the heat exchanger 4 is increased, and the damage to the heat exchanger 4 caused by the corrosion of the dew point of corrosive gas contained in the protective flue gas is prevented.
The details of which are not described in the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an aluminium melting protection gas cleaning recovery system which characterized by: comprises an aluminum smelting furnace and a flue connected with a hearth and a furnace door of the aluminum smelting furnace; a dust remover, a heat exchanger and a variable frequency induced draft fan are connected to the flue in sequence; the pressure sensor is connected with the variable-frequency induced draft fan through the control unit and used for controlling the negative pressure in the flue; and the temperature sensors are arranged at two ends of the heat exchanger and are connected with a circulating pump of the heat exchanger through a control unit for controlling the flow of heat exchange media in the heat exchanger.
2. The aluminum melting protection flue gas purification and recovery system as claimed in claim 1, wherein: the dust remover is a metal fiber filter bag dust remover.
3. The aluminum melting protection flue gas purification and recovery system as claimed in claim 2, wherein: the metal fiber filter bag dust remover is connected with a compressed air dust cleaning device and a pressure difference transmitter, and the pressure difference transmitter is connected with the compressed air dust cleaning device.
4. The aluminum melting protection flue gas purification and recovery system as claimed in claim 2, wherein: the film-coated polyester fiber filter bag dust remover is connected with a timing dust cleaning device.
5. The aluminum melting protection flue gas purification and recovery system as claimed in claim 1, wherein: the control unit is connected with the circulating pump through a PID controller.
6. The aluminum melting protection flue gas purification and recovery system as claimed in claim 1, wherein: a valve is arranged on the flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121298589.XU CN215638864U (en) | 2021-06-10 | 2021-06-10 | Aluminum melting protection flue gas purification and recovery system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121298589.XU CN215638864U (en) | 2021-06-10 | 2021-06-10 | Aluminum melting protection flue gas purification and recovery system |
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| CN215638864U true CN215638864U (en) | 2022-01-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116294645A (en) * | 2023-01-07 | 2023-06-23 | 秦皇岛信能能源设备有限公司 | Aluminum melting furnace flue gas treatment device and process |
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2021
- 2021-06-10 CN CN202121298589.XU patent/CN215638864U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116294645A (en) * | 2023-01-07 | 2023-06-23 | 秦皇岛信能能源设备有限公司 | Aluminum melting furnace flue gas treatment device and process |
| CN116294645B (en) * | 2023-01-07 | 2023-12-22 | 秦皇岛信能能源设备有限公司 | Aluminum melting furnace flue gas treatment device and process |
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