Flue gas dust removal device for aluminum melting furnace

Abstract

The utility model relates to the field of flue gas dust removal discloses smelting aluminium furnace flue gas dust removal device, including water tank, water vapor separation filter, cloth bag dust collector, first flue gas pipe dips into the inside of water tank, and the end part is equipped with conical mouth and is immersed in the water of water tank, water tank is connected with inlet pipe, water level sensor, first blowoff pipe with valve, and the outside is connected with heat pump system, and the heat pump system is arranged through hose winding in the inner wall of water tank to realize the cooling of water in water tank, water tank still is connected with second flue gas pipe, and its other end is connected with water vapor separation filter, and the other end of water vapor separation filter is connected with cloth bag dust collector, and the other end of cloth bag dust collector is connected with flue gas exhaust pipe, and the bottom of water vapor separation filter is connected with second blowoff pipe, in the utility model, three -section type processing realizes the layered purification of flue gas, and the conical mouth helps the preliminary dust removal and prevents the blockage, and the water vapor separation preserves cloth bag performance, and the cloth bag fine filtration, and the supporting structure guarantees the stable and efficient operation of device.

Description

Technical Field

[0001] This utility model relates to the field of flue gas dust removal, and in particular to a flue gas dust removal device for aluminum melting furnaces. Background Technology

[0002] Aluminum melting furnaces are key equipment in the aluminum processing industry. During operation, they generate dusty flue gas containing aluminum dust and alumina particles. Direct emissions of this gas pollute the atmosphere and harm human health. With increasingly stringent environmental regulations, emission limits for particulate matter from industrial flue gas are becoming more stringent. Efficient purification of aluminum melting furnace flue gas has become a core requirement for enterprises to meet environmental compliance and achieve sustainable production.

[0003] Existing flue gas dust removal devices for aluminum melting furnaces have several specific defects: First, they mostly use a single dust removal method, relying solely on water filtration, which cannot remove fine particles. Direct bag filtration lacks water vapor separation, and water vapor easily clogs the filter media, reducing dust removal efficiency. Second, the flue gas pipe extending into the water tank is a straight pipe, resulting in a slow flue gas flow rate that cannot flush out dust inside the pipe, easily leading to accumulation and blockage. Furthermore, there is no effective water cooling mechanism; increased water temperature reduces water adsorption and accelerates water tank corrosion, making long-term stable operation difficult. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a dust removal device for aluminum melting furnace flue gas, which aims to improve the problem that the flue gas pipe is a straight pipe at the end that extends into the water tank, the flue gas flow rate is slow, and it is impossible to remove dust inside the pipe, which is easy to accumulate and blockage.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a dust removal device for aluminum melting furnace flue gas, comprising a water tank, a water-vapor separation filter, and a bag filter. A first flue gas pipe for introducing the flue gas to be treated extends into the water tank. The end of the first flue gas pipe extending into the water tank has a conical opening, which is submerged in the water within the tank. A second flue gas pipe for conveying the flue gas is connected to the water tank. The end of the second flue gas pipe furthest from the water tank is connected to the water-vapor separation filter to guide the pre-treated flue gas from the water tank into the water-vapor separation filter. The water tank is also connected to an inlet pipe for replenishing cold water and a water level sensor for real-time monitoring of the water level within the tank. A first drain pipe with a valve is connected to the bottom of the water tank for discharging dust and impurities deposited within the tank.

[0006] A heat pump system for cooling is connected to the outside of the water tank. The heat pump system is installed by wrapping a flexible hose around the inner wall of the water tank to achieve circulating cooling of the water in the tank. The end of the water vapor separation filter away from the second flue gas pipe is connected to a bag filter to perform deep dust removal on the flue gas after water vapor separation. The end of the bag filter away from the water vapor separation filter is connected to a flue gas exhaust pipe for discharging the purified flue gas. The bottom of the water vapor separation filter is connected to a second sewage pipe for discharging wastewater.

[0007] Preferably, both the first and second sewage pipes are connected to a sewage tank to collect the dust and sewage discharged from the water tank and the sewage discharged from the water vapor separator filter.

[0008] Preferably, the conical opening on the first flue pipe is a variable diameter structure, with the upper diameter of the conical opening matching the diameter of the first flue pipe, the lower diameter of the conical opening being smaller than its upper diameter, and the inner wall of the conical opening having a smooth transition. This variable diameter structure increases the flow velocity of the flue gas when it is discharged from the conical opening, which can impact the impurities and dust remaining at the bottom of the first flue pipe and flush them to the bottom of the water tank, while reducing the resistance to flue gas flow.

[0009] Preferably, the water level sensor is linked to the water inlet pipe. When the water level sensor detects that the water level in the water tank is lower than a preset value, it can control the water inlet pipe to replenish water into the water tank to ensure the water level in the water tank is stable.

[0010] Preferably, the heat pump system is equipped with an evaporator, the hose is filled with a heat exchange medium, and the hose is wound around the inner wall of the water tank to exchange heat with the water in the tank. The two ends of the hose are connected to the evaporator. After absorbing the heat from the water in the tank, the heat exchange medium enters the evaporator to cool down. The cooled heat exchange medium flows back to the hose, forming a closed-loop cooling cycle of the heat exchange medium in the hose, thereby achieving the cooling of the water in the tank.

[0011] Preferably, the valve on the first sewage pipe is a manually controlled valve or an electrically controlled valve. The valve on the first sewage pipe can adapt to the sewage discharge operation requirements under different working conditions, because the two control methods can be flexibly switched according to the on-site operating conditions, taking into account both convenience and automation requirements.

[0012] Preferably, the conical nozzle is submerged 5-15 cm below the liquid surface in the water tank, and the lower end of the conical nozzle faces the bottom of the water tank, so as to prolong the residence time of the flue gas in the water and enhance the initial dust removal effect.

[0013] Preferably, the connection between the second flue gas pipe and the water tank and the water vapor separation filter is provided with a high-temperature resistant seal. The seal is made of high-temperature resistant rubber to prevent flue gas or water vapor from leaking from the connection and to ensure the airtightness of the device.

[0014] Preferably, the heat pump system further includes a condenser, the outlet end of which is connected to a hot water recovery pipe. The hot water recovery pipe can transport the hot water generated by the condenser to external hot water demand equipment to realize the secondary utilization of heat.

[0015] Preferably, the detection end of the water level sensor is covered with a filter screen to prevent dust and impurities in the water tank from adhering to the sensor detection end, thus ensuring the accuracy of water level detection.

[0016] This utility model has the following beneficial effects:

[0017] 1. In the present utility model, firstly, the tapered opening at the end of the first flue gas pipe is immersed in the water in the water tank, so that the flue gas to be treated can directly and fully contact with water, and the large particle dust impurities in the flue gas are primarily filtered by means of the adsorption of water. Meanwhile, the design of the tapered opening can impact the residual impurity dust at the bottom of the first flue gas pipe and flush it to the bottom of the water tank, so as to prevent dust from accumulating in the first flue gas pipe and ensure smooth flue gas transportation; the primarily treated flue gas enters the water-vapor separation filter through the second flue gas pipe, which effectively intercepts the water vapor carried in the flue gas, prevents water vapor from entering the bag filter to affect the performance of filter material, and ensures stable deep dust removal effect; finally, the flue gas is finely filtered by the bag filter to remove the remaining fine dust, and the cleanliness of the flue gas finally discharged through the smoke exhaust pipe is greatly improved, meeting the requirements of environmental protection emission.

[0018] The water inlet pipe matched with the water tank cooperates with the water level sensor to maintain a stable water level in the water tank in real time, preventing the primary dust removal effect from decreasing due to excessively low water level; the first sewage discharge pipe at the bottom of the water tank can discharge deposited dust impurities in time, preventing impurities from accumulating in the water tank to block pipelines or pollute water body; the heat pump system is arranged by winding a hose on the inner wall of the water tank, so as to cool the water body in the water tank, and prevent the water in the tank from heating up too high by absorbing heat from the flue gas, which would affect the subsequent dust removal efficiency of the contact between the flue gas and the water body.

[0019] 2. In the present utility model, the arrangement of the sewage tank enables centralized collection and treatment of the sewage discharged from the first sewage discharge pipe and the second sewage discharge pipe, avoiding secondary pollution caused by arbitrary discharge of sewage, simplifying the subsequent sewage treatment process and reducing the environmental protection operation and maintenance cost; the diameter-varying structure of the tapered opening and the smooth inner wall design not only improve the discharge flow rate of the flue gas, can actively impact the residual impurities at the bottom of the first flue gas pipe and flush them to the bottom of the water tank, but also reduce the flow resistance of the flue gas and prevent the flue gas from滞留 in the pipe; the linkage design of the water level sensor and the water inlet pipe realizes automatic water replenishment, without frequent manual monitoring and operation, which saves labor cost and ensures that the water level of the water tank is always in the optimal dust removal range; the evaporator in the heat pump system cooperates with the hose wound on the inner wall of the water tank, and the heat exchange medium in the hose forms a closed-loop cooling cycle, which improves the cooling efficiency of the water body, and the hot water recovery pipe matched with the condenser can convey the hot water generated in the heat exchange process to external demand equipment, realize the secondary utilization of flue gas waste heat, reduce the overall energy consumption of the device, and meet the energy saving requirements.

[0020] The first drain valve can be manually or electrically controlled according to actual needs, flexibly adapting to drain operations under different working conditions; the specific immersion depth and orientation design of the conical opening further extends the residence time of flue gas in water, enhancing the initial dust removal effect; the heat-resistant seal at the connection of the second flue gas pipe can effectively prevent flue gas or water vapor leakage, avoiding environmental pollution or reduced dust removal efficiency due to leakage; the filter screen at the detection end of the water level sensor can block the adhesion of dust and impurities, ensuring accurate water level detection data, preventing abnormal water replenishment due to sensor misjudgment, and comprehensively improving the stability and reliability of the device operation. Attached Figure Description

[0021] Figure 1 This is an overall diagram of the aluminum melting furnace flue gas dust removal device proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the first flue gas pipe structure of the aluminum melting furnace flue gas dust removal device proposed in this utility model.

[0023] Figure 3 This is a schematic diagram of the internal structure of the water tank in the aluminum melting furnace flue gas dust removal device proposed in this utility model;

[0024] Figure 4 This is a schematic diagram of the heat pump system structure of the aluminum melting furnace flue gas dust removal device proposed in this utility model.

[0025] Legend:

[0026] 1. Water inlet pipe; 2. First flue gas pipe; 3. Water tank; 4. Heat pump system; 5. First sewage pipe; 6. Sewage tank; 7. Second flue gas pipe; 8. Water vapor separator filter; 9. Bag filter; 10. Exhaust pipe; 11. Valve; 12. Second sewage pipe; 13. Water level sensor; 14. Conical inlet; 15. Flexible hose; 16. Evaporator; 17. Condenser; 18. Hot water recovery pipe. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1, refer to Figures 1-4The aluminum melting furnace flue gas dust removal device includes a water tank 3, a water vapor separator filter 8, and a bag filter 9. A first flue gas pipe 2 extends into the water tank 3 for introducing the flue gas to be treated. The end of the first flue gas pipe 2 extending into the water tank 3 has a conical opening 14, which is submerged in the water within the water tank 3. A second flue gas pipe 7 is connected to the water tank 3 for conveying flue gas. The end of the second flue gas pipe 7 away from the water tank 3 is connected to the water vapor separator filter 8 to guide the pre-treated flue gas from the water tank 3 into the water vapor separator filter 8. The water tank 3 is also connected to a water inlet pipe 1 for replenishing cold water, and a water level sensor for real-time monitoring of the water level within the water tank 3. Sensor 13; The bottom of the water tank 3 is connected to a first drain pipe 5 with a valve 11 for discharging dust and impurities deposited in the water tank 3; A heat pump system 4 for cooling is connected to the outside of the water tank 3. The heat pump system 4 is wound around the inner wall of the water tank 3 through a hose 15 to cool the water in the water tank 3; The end of the water vapor separation filter 8 away from the second flue gas pipe 7 is connected to the bag filter 9 for deep dust removal of the flue gas after water vapor separation; The end of the bag filter 9 away from the water vapor separation filter 8 is connected to an exhaust pipe 10 for discharging the purified flue gas; The bottom of the water vapor separation filter 8 is connected to a second drain pipe 12 for discharging wastewater.

[0029] The first flue gas pipe 2 transports the flue gas to be treated to the water tank 3. After preliminary treatment by contacting the water in the water tank 3 through the conical opening 14, the flue gas is transported by the second flue gas pipe 7 to the water vapor separator 8 to remove water vapor. Then, it enters the bag filter 9 for deep filtration and is discharged from the exhaust pipe 10. At the same time, the water inlet pipe 1 replenishes cold water, the water level sensor 13 monitors the water level, the first sewage pipe 5 discharges impurities, and the heat pump system 4 cools the flue gas through the flexible hose 15 wrapped around the inner wall of the water tank 3. This can efficiently purify the flue gas and ensure stable operation.

[0030] Example 2, refer to Figures 1-4Based on Embodiment 1, both the first sewage pipe 5 and the second sewage pipe 12 are connected to a sewage tank 6 to centrally collect the dust and sewage discharged from the water tank 3 and the sewage discharged from the water vapor separator 8. The sewage discharged from both the first sewage pipe 5 and the second sewage pipe 12 is transported to the sewage tank 6, which avoids secondary pollution caused by dispersed sewage discharge and simplifies the treatment process, as the sewage tank 6 can centrally collect sewage from different sources. The conical opening 14 on the first flue gas pipe 2 has a variable diameter structure; the upper diameter of the conical opening 14 is adapted to the pipe diameter of the first flue gas pipe 2, and the lower diameter of the conical opening 14... The diameter of the port is smaller than that of the port above it, and the inner wall of the conical opening 14 has a smooth transition. This variable diameter structure increases the flow velocity of the flue gas when it exits from the conical opening 14, which can impact the impurities and dust remaining at the bottom of the first flue gas pipe 2 and flush them to the bottom of the water tank 3. At the same time, it can reduce the flow resistance of the flue gas. The conical opening 14 on the first flue gas pipe 2 increases the flow velocity of the flue gas when it exits, which can impact the impurities at the bottom of the first flue gas pipe 2 and reduce the flow resistance. Because of the variable diameter design, the airflow cross section is compressed to increase the flow velocity, and the smooth inner wall avoids airflow obstruction. The water level sensor 13 is linked to the water inlet pipe 1. When the water level sensor 13... When the water level in water tank 3 is detected to be lower than the preset value, the water inlet pipe 1 can be controlled to replenish water into water tank 3 to ensure the stability of the water level in water tank 3. When the water level sensor 13 detects that the water level in water tank 3 is lower than the preset value, it controls the water inlet pipe 1 to replenish water, which can maintain the stability of the water level in water tank 3 to ensure the initial dust removal effect, because the water level sensor 13 can monitor the water level change in real time and trigger the water replenishment action; the heat pump system 4 is equipped with an evaporator 16, the hose 15 is filled with heat exchange medium, and the hose 15 is wrapped around the inner wall of water tank 3 to exchange heat with the water in water tank 3. The two ends of the hose 15 are connected to the evaporator. The heat exchange medium absorbs heat from the water in the water tank 3 and then enters the evaporator 16 for cooling. After cooling, the heat exchange medium flows back to the hose 15, forming a closed-loop cooling cycle of the heat exchange medium in the hose 15, thereby achieving cooling of the water in the water tank 3. After heat exchange between the heat exchange medium in the hose 15 and the water in the water tank 3, it enters the evaporator 16 for cooling, which can achieve continuous cooling of the water in the water tank 3 because the evaporator 16 can efficiently absorb heat from the heat exchange medium. The hose 15 wraps around the inner wall of the water tank 3 and constructs a closed-loop circulation path for the heat exchange medium. The valve 11 on the first drain pipe 5 is a manually controlled valve.

[0031] Example 3, refer to Figures 1-4Based on Embodiment 1 or Embodiment 2, the conical opening 14 is submerged 15cm below the liquid surface in the water tank 3, with the lower end of the conical opening 14 facing the bottom of the water tank 3. This extends the residence time of the flue gas in the water, enhancing the initial dust removal effect. The conical opening 14 enhances the initial dust removal effect of the water tank 3 on the flue gas because its submersion depth and orientation design extend the residence time of the flue gas in the water, allowing the flue gas to fully contact the water and adsorb impurities. Temperature-resistant seals are installed at the connections between the second flue gas pipe 7 and the water tank 3 and the water vapor separation filter 8. These seals are made of high-temperature resistant rubber to prevent flue gas or water vapor from leaking from the connections, ensuring the device's airtightness. The temperature-resistant seals at the connections between the second flue gas pipe 7 and the water tank 3 and the water vapor separation filter 8 prevent flue gas or water vapor from leaking from the connections because they are airtight. The seal can tightly fit the connection gap, and the high-temperature resistant material is suitable for the temperature environment during the operation of the device; the heat pump system 4 also includes a condenser 17, the outlet end of which is connected to a hot water recovery pipe 18. The hot water recovery pipe 18 can transport the hot water generated by the condenser 17 to external hot water demand equipment to realize the secondary utilization of heat. The hot water generated by the condenser 17 of the heat pump system 4 can be transported to external hot water demand equipment to realize the secondary utilization of flue gas waste heat to reduce energy consumption; the detection end of the water level sensor 13 is covered with a filter screen to prevent dust and impurities in the water tank from adhering to the sensor detection end, ensuring the accuracy of water level detection. The water level sensor 13 can ensure the accuracy of water level detection data because the filter screen at its detection end can block dust and impurities in the water tank 3 from adhering, avoiding impurities from interfering with the detection accuracy of the sensor.

[0032] Working principle: The flue gas from the aluminum melting furnace to be treated first enters the first flue gas pipe 2, and is then transported to the inside of the water tank 3. The end of the first flue gas pipe 2 that extends into the water tank 3 is provided with a conical opening 14. The conical opening 14 has a variable diameter structure, with the lower port diameter being smaller than the upper port diameter. This structure can increase the flow velocity of the flue gas when it is discharged from the conical opening 14, thereby impacting the impurities and dust remaining at the bottom of the first flue gas pipe 2 and flushing them to the bottom of the water tank 3. At the same time, the conical opening 14 is submerged below the liquid surface in the water tank 3, with the lower opening facing the bottom of the water tank 3. This can prolong the residence time of the flue gas in the water, allowing the flue gas to fully contact the water in the water tank 3. The water's adsorption effect is used to perform preliminary dust removal on the flue gas, removing some of the large dust and impurities in the flue gas. The pre-treated flue gas is discharged from the water tank 3 and enters the second flue gas pipe 7. It is then transported to the water vapor separation filter 8 through the second flue gas pipe 7. The connection between the second flue gas pipe 7 and the water tank 3 and the water vapor separation filter 8 is equipped with a high-temperature resistant seal. The high-temperature resistant seal is made of high-temperature resistant rubber material, which can prevent flue gas or water vapor from leaking from the connection and ensure the airtightness of the device. The water vapor separation filter 8 intercepts and separates the water vapor in the flue gas to prevent water vapor from entering the subsequent components and affecting the dust removal effect. The flue gas after water vapor separation is continued to be transported to the bag filter 9. The bag filter 9 performs deep dust removal on the flue gas, filtering out the remaining fine dust impurities in the flue gas. Finally, the purified flue gas is discharged from the exhaust pipe 10.

[0033] During the operation of the device, the water level sensor 13 monitors the water level in the water tank 3 in real time. The detection end of the water level sensor 13 is covered with a filter screen, which can prevent dust and impurities in the water tank 3 from adhering to the sensor detection end and ensure the accuracy of water level detection. When the water level sensor 13 detects that the water level in the water tank 3 is lower than the preset value, it will control the water inlet pipe 1 to replenish cold water into the water tank 3 to ensure the stability of the water level in the water tank 3 and meet the water demand for preliminary dust removal of flue gas. The heat pump system 4 connected to the outside of the water tank 3 is used to cool the water inside the water tank 3. The flexible hose 15 is wrapped around the inner wall of the water tank 3. The heat exchange medium inside the hose absorbs the heat of the water in the water tank 3 and then enters the evaporator 16 inside the heat pump system 4. After the heat exchange and cooling by the evaporator 16, the heat exchange medium flows back to the flexible hose 15, forming a closed-loop cooling cycle of the heat exchange medium in the flexible hose 15, thereby cooling the water in the water tank 3. At the same time, the heat pump system 4 also includes a condenser 17. The outlet end of the condenser 17 is connected to a hot water recovery pipe 18. The hot water recovery pipe 18 can transport the hot water generated by the condenser 17 to external hot water demand equipment to realize the secondary utilization of heat. A valve 11 is installed on the first drain pipe 5 connected to the bottom of the water tank 3. The valve 11 is a manual control valve or an electric control valve. When a lot of impurities and dust accumulate at the bottom of the water tank 3, the valve 11 can be opened to allow the impurities and dust to be discharged with the sewage through the first drain pipe 5. The bottom of the water vapor separator 8 is connected to the second drain pipe 12. The sewage formed by the water vapor intercepted by the water vapor separator 8 is discharged through the second drain pipe 12. The sewage discharged from the first drain pipe 5 and the second drain pipe 12 is eventually transported to the sewage tank 6 for centralized collection and treatment.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dust removal device for aluminum melting furnace flue gas, comprising a water tank (3), a water vapor separation filter (8), and a bag filter (9), characterized in that: The water tank (3) has a first flue gas pipe (2) for introducing flue gas to be treated. The end of the first flue gas pipe (2) extending into the water tank (3) is provided with a conical opening (14), and the conical opening (14) is submerged in the water in the water tank (3). The water tank (3) is connected to a second flue gas pipe (7) for conveying flue gas. The end of the second flue gas pipe (7) away from the water tank (3) is connected to a water vapor separation filter (8) to introduce the flue gas after preliminary treatment in the water tank (3) into the water vapor separation filter (8). The water tank (3) is also connected to an inlet pipe (1) for replenishing cold water and a water level sensor (13) for real-time monitoring of the water level in the water tank (3). The bottom of the water tank (3) is connected to a first drain pipe (5) with a valve (11) for discharging the dust and impurities deposited in the water tank (3). The water tank (3) is connected to a heat pump system (4) for cooling. The heat pump system (4) is wound around the inner wall of the water tank (3) through a hose (15) to cool the water in the water tank (3). The end of the water vapor separation filter (8) away from the second flue gas pipe (7) is connected to the bag filter (9) to perform deep dust removal on the flue gas after water vapor separation. The end of the bag filter (9) away from the water vapor separation filter (8) is connected to a flue pipe (10) for discharging the purified flue gas. The bottom of the water vapor separation filter (8) is connected to a second sewage pipe (12) for discharging sewage.

2. The dust removal device for aluminum melting furnace flue gas according to claim 1, characterized in that: Both the first sewage pipe (5) and the second sewage pipe (12) are connected to a sewage tank (6) to collect the dust sewage discharged from the water tank (3) and the sewage discharged from the water vapor separator (8).

3. The dust removal device for aluminum melting furnace flue gas according to claim 1, characterized in that: The conical opening (14) on the first flue gas pipe (2) is a variable diameter structure. The upper port diameter of the conical opening (14) is adapted to the pipe diameter of the first flue gas pipe (2). The lower port diameter of the conical opening (14) is smaller than its upper port diameter, and the inner wall of the conical opening (14) has a smooth transition. This variable diameter structure increases the flow rate of flue gas when it is discharged from the conical opening (14), which can impact the impurities and dust remaining at the bottom of the first flue gas pipe (2) and flush them to the bottom of the water tank (3), while reducing the resistance to flue gas flow.

4. The dust removal device for aluminum melting furnace flue gas according to claim 1, characterized in that: The water level sensor (13) is linked with the water inlet pipe (1). When the water level sensor (13) detects that the water level in the water tank (3) is lower than the preset value, it can control the water inlet pipe (1) to replenish water into the water tank (3) to ensure the stability of the water level in the water tank (3).

5. The dust removal device for aluminum melting furnace flue gas according to claim 1, characterized in that: The heat pump system (4) is equipped with an evaporator (16) inside. The hose (15) is filled with heat exchange medium and is wrapped around the inner wall of the water tank (3) to exchange heat with the water in the water tank (3). The two ends of the hose (15) are connected to the evaporator (16). After absorbing the heat of the water in the water tank (3), the heat exchange medium enters the evaporator (16) to cool down. The cooled heat exchange medium flows back to the hose (15), forming a closed-loop cooling cycle of the heat exchange medium in the hose (15), thereby achieving the cooling of the water in the water tank (3).

6. The dust removal device for aluminum melting furnace flue gas according to claim 1, characterized in that: The valve (11) on the first sewage pipe (5) is a manually controlled valve or an electrically controlled valve.

7. The dust removal device for aluminum melting furnace flue gas according to claim 1, characterized in that: The conical opening (14) is submerged 5-15 cm below the liquid surface in the water tank (3), and the lower end of the conical opening (14) faces the bottom of the water tank (3) to prolong the residence time of the flue gas in the water and enhance the initial dust removal effect.

8. The dust removal device for aluminum melting furnace flue gas according to claim 1, characterized in that: The connection between the second flue gas pipe (7) and the water tank (3) and the water vapor separation filter (8) is provided with a high-temperature resistant seal. The seal is made of high-temperature resistant rubber to prevent flue gas or water vapor from leaking from the connection and to ensure the sealing of the device.

9. The dust removal device for aluminum melting furnace flue gas according to claim 1, characterized in that: The heat pump system (4) also includes a condenser (17), the outlet end of which is connected to a hot water recovery pipe (18). The hot water recovery pipe (18) can transport the hot water generated by the condenser (17) to external hot water demand equipment to realize the secondary utilization of heat.

10. The dust removal device for aluminum melting furnace flue gas according to claim 1, characterized in that: The detection end of the water level sensor (13) is covered with a filter screen to prevent dust and impurities in the water tank from adhering to the sensor detection end, thus ensuring the accuracy of water level detection.

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