Smoke gas heat exchange structure for aluminum smelting furnace

Abstract

This utility model discloses a flue gas heat exchange structure for an aluminum smelting furnace, including a flue pipe and a heat exchange box. The heat exchange box is located above the flue pipe, and the bottom of the heat exchange box has a flue gas inlet connected to the flue pipe. In this utility model, a preheating unit, heat exchange straight pipes, and a water storage chamber are set inside the heat exchange box. After the high-temperature flue gas is filtered by the filtration unit, it enters several heat exchange straight pipes. The high-temperature flue gas first preheats the aluminum powder added in the preheating unit through heat conduction through the heat exchange straight pipes and the lower fins on their lower surface. Then, it heats the water in the water storage chamber through the heat exchange straight pipes and the upper fins on their upper surface. The flue gas shell installed inside the water storage chamber then conducts the heat from the flue gas to the water in the water storage chamber through heat conduction, so as to achieve full absorption of heat in the high-temperature flue gas. This satisfies the preheating requirement before aluminum powder smelting and facilitates the full recovery of waste heat from the flue gas.

Description

Technical Field

[0001] This utility model relates to the field of flue gas waste heat utilization technology, and in particular to a flue gas heat exchange structure for an aluminum smelting furnace. Background Technology

[0002] Smelting refers to melting solid metal into liquid in a heating furnace and tempering it. It is also one of the casting production processes. Smelting also means melting and refining. Common metals have high melting points, so a lot of energy is needed to melt them. The fumes emitted from the surface of liquid metal also have high temperatures. If these high-temperature fumes are directly emitted, they will not only cause environmental pollution, but also waste energy. The common treatment method is to recycle and reuse the high-temperature fumes, utilizing their high-temperature characteristics to achieve waste heat utilization.

[0003] Currently, in the traditional heat exchange structure used for aluminum smelting, U-shaped tubes are typically used. The heat recovered by this heat exchange structure cannot be directly used in the smelting process of the aluminum smelting furnace, resulting in insufficient preheating recovery and waste of heat energy. The flue gas emitted from the smelting furnace contains a certain amount of dust particles. These particles not only affect the normal flow of high-temperature flue gas in the heat exchange structure, but also reduce the heat conversion efficiency.

[0004] To address this, a flue gas heat exchange structure for aluminum smelting furnaces is proposed, which has the advantage of easily absorbing the waste heat of flue gas, thereby solving the problems mentioned in the background technology. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a flue gas heat exchange structure for aluminum smelting furnaces.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a flue gas heat exchange structure for an aluminum smelting furnace, comprising a flue pipe and a heat exchange box. The heat exchange box is positioned above the flue pipe, and an inlet connected to the flue pipe is located at the bottom of the heat exchange box. Inside the heat exchange box, from bottom to top, are arranged a filtration unit, a preheating unit, and a water storage chamber. The filtration unit has a lower filter plate and an upper filter plate internally installed, and several heat exchange straight pipes are connected to the top of the filtration unit. The lower surface of the straight tube is provided with lower fins, which are located inside the preheating unit. The upper surface of the heat exchange straight tube is provided with upper fins, which are located inside the water storage cavity. The top of the heat exchange straight tube is connected to a flue shell, which is located on the inner top surface of the water storage cavity. The top surface of the heat exchange box is provided with a flue outlet connected to the flue shell. A feed inlet is opened at the edge of the top surface of the preheating unit, and a discharge nozzle is connected to the right side wall of the preheating unit. A gate valve is installed on the surface of the discharge nozzle.

[0007] As a further description of the above technical solution: a high-pressure air source is fixed on the side wall of the heat exchange box, and the outlet of the high-pressure air source is connected to a blow pipe. A blow valve is installed on the surface of the blow pipe, and one end of the blow pipe extends between the lower filter plate and the upper filter plate. A set of blow nozzles is respectively provided on the upper and lower surfaces of the blow pipe. A dust suction pipe is inserted and installed on the bottom surface of the heat exchange box, and several dust suction nozzles connected to the filter unit are provided at the upper end of the dust suction pipe. The lower end of the dust suction pipe is connected to an external industrial vacuum cleaner.

[0008] As a further description of the above technical solution: the preheating unit is a trapezoidal structure, and a sealing cover is hinged at the feed inlet of the preheating unit. A motor is fixedly installed on the surface of the preheating unit, and a puncture roller is fixed to the output end of the motor through a coupling. The puncture roller is located on the lower inner side of the preheating unit.

[0009] As a further description of the above technical solution: an inlet pipe connected to the water storage chamber is provided on the upper left side of the heat exchange box, and an outlet pipe connected to the water storage chamber is provided on the upper right side of the heat exchange box. Valves are installed on the surface of both the inlet pipe and the outlet pipe.

[0010] As a further description of the above technical solution: the high-pressure air source is specifically a high-pressure pulse air compressor, and the two sets of nozzles are respectively arranged facing the lower filter plate and the upper filter plate.

[0011] As a further description of the above technical solution: several heat exchange straight tubes are arranged in two rows, and each heat exchange straight tube has a round hole on the surface of its upper fin.

[0012] This utility model has the following beneficial effects:

[0013] In this invention, a preheating unit, heat exchange straight tubes, and a water storage chamber are installed inside the heat exchange box. As high-temperature flue gas is filtered by the filtration unit and enters several heat exchange straight tubes, the high-temperature flue gas first preheats the aluminum powder added in the preheating unit through heat conduction via the heat exchange straight tubes and the lower fins on their lower surface. Then, the water in the water storage chamber is heated through the heat exchange straight tubes and the upper fins on their upper surface. The exhaust shell installed inside the water storage chamber then conducts the heat from the flue gas to the water in the water storage chamber through heat conduction, thus achieving full absorption of heat in the high-temperature flue gas. This not only satisfies the preheating requirement before aluminum powder smelting but also facilitates the full recovery of waste heat from the flue gas. This solves the problems of insufficient preheating recovery and heat energy waste in traditional heat exchange structures, and the use of preheating improves the efficiency of aluminum powder smelting.

[0014] In this invention, a high-pressure gas source, a blowpipe, a blow valve, several blow nozzles, a suction pipe, and several suction nozzles are installed on the outer wall of the heat exchange box. By activating the high-pressure gas source, high-pressure gas is forced into the blowpipe. During this process, the blow valve is intermittently opened and closed by a control signal, causing the high-pressure gas in the blowpipe to be intermittently released through the blow nozzles. This allows the blow nozzles to clean the upper and lower filter plates inside the filter unit. At this time, an industrial vacuum cleaner is connected to the suction pipe. As the industrial vacuum cleaner is activated, the dust particles blown into the filter unit by the high-pressure gas are absorbed through the suction nozzles. This method facilitates the cleaning of the upper and lower filter plates and the absorption of dust particles, thereby ensuring the filtration effect of the filter unit on the flue gas. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the flue gas heat exchange structure for an aluminum smelting furnace according to the present invention;

[0016] Figure 2 This is a schematic diagram of the internal structure of the preheating unit;

[0017] Figure 3 This is a schematic diagram of the internal structure of the filter unit;

[0018] Figure 4 This is a 3D diagram of the preheating unit.

[0019] Legend:

[0020] 1. Exhaust pipe; 2. Heat exchanger box; 3. Smoke inlet; 4. Exhaust outlet; 5. Filter unit; 6. Preheating unit; 7. Heat exchanger straight tube; 8. Exhaust shell; 9. Water storage chamber; 10. Water inlet pipe; 11. Water outlet pipe; 12. Motor; 13. Discharge nozzle; 14. Gate valve; 15. Dust suction pipe; 16. High-pressure air source; 17. Blow-through pipe; 18. Blow-through valve; 19. Upper fin; 20. Lower fin; 21. Spike roller; 22. Feed inlet; 23. Lower filter plate; 24. Upper filter plate; 25. Dust suction nozzle; 26. Blow-through nozzle. Detailed Implementation

[0021] 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.

[0022] According to an embodiment of the present invention, a flue gas heat exchange structure for an aluminum smelting furnace is provided.

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4 As shown, a flue gas heat exchange structure for an aluminum smelting furnace according to an embodiment of the present invention includes a flue pipe 1 and a heat exchange box 2. The heat exchange box 2 is arranged above the flue pipe 1, and the bottom of the heat exchange box 2 is provided with a flue gas inlet 3 connected to the flue pipe 1. Inside the heat exchange box 2, from bottom to top, a filter unit 5, a preheating unit 6, and a water storage chamber 9 are arranged sequentially. The filter unit 5 has a lower filter plate 23 and an upper filter plate 24 installed inside, and the top of the filter unit 5 is connected to several heat exchange straight pipes 7. The lower surface of the heat exchange straight pipes 7 is provided with lower fins 20, and the lower fins 20 are located in the preheating unit 6. Inside, the upper surface of the heat exchange straight tube 7 is provided with upper fins 19, and the upper fins 19 are located inside the water storage cavity 9. The top of the heat exchange straight tube 7 is connected to the exhaust shell 8, and the exhaust shell 8 is located on the inner top surface of the water storage cavity 9. The top surface of the heat exchange box 2 is provided with an exhaust port 4 connected to the exhaust shell 8. The edge of the top surface of the preheating unit 6 is provided with an inlet 22, and the right side wall of the preheating unit 6 is connected to an outlet 13. The surface of the outlet 13 is equipped with a gate valve 14. The end of the preheating unit 6 with the inlet buckle extends to the outside of the heat exchange box 2, which is convenient for adding aluminum powder or other forms of aluminum materials.

[0024] In one embodiment, a high-pressure air source 16 is fixed to the side wall of the heat exchange box 2, and the outlet of the high-pressure air source 16 is connected to a blowpipe 17. A blowpipe valve 18 is installed on the surface of the blowpipe 17, and one end of the blowpipe 17 extends between the lower filter plate 23 and the upper filter plate 24. A set of blowpipe nozzles 26 are respectively provided on the upper and lower surfaces of the blowpipe 17. A dust suction pipe 15 is inserted and installed on the bottom surface of the heat exchange box 2, and several dust suction nozzles 25 connected to the filter unit 5 are provided at the upper end of the dust suction pipe 15. The lower end is connected to an external industrial vacuum cleaner. This structure facilitates the cleaning of the lower filter plate 23 and the upper filter plate 24 and the absorption of dust particles, thereby ensuring the filtration effect of the filter unit 5 on the flue gas. The high-pressure air source 16 and the motor 12 are controlled by manual start and stop switches. The wiring diagram of the power components and the power supply are common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

[0025] In one embodiment, the preheating unit 6 is a trapezoidal structure, and a sealing cover is hinged to the feed inlet 22 of the preheating unit 6. A motor 12 is fixedly installed on the surface of the preheating unit 6, and a spiked roller 21 is fixed to the output end of the motor 12 through a coupling. The spiked roller 21 is located in the lower inner part of the preheating unit 6. With this structure, the motor 12 drives the spiked roller 21 to rotate, so as to stir the aluminum powder accumulated inside the preheating unit 6, which is easy to fully discharge and preheat.

[0026] In one embodiment, an inlet pipe 10 connected to the water storage chamber 9 is provided on the upper left side of the heat exchange box 2, and an outlet pipe 11 connected to the water storage chamber 9 is provided on the upper right side of the heat exchange box 2. Valves are installed on the surface of both the inlet pipe 10 and the outlet pipe 11. This structure facilitates the inlet and outlet of water in the water storage chamber 9, making it convenient for water filling and hot water access.

[0027] In one embodiment, the high-pressure air source 16 is specifically a high-pressure pulse air compressor, and the two sets of nozzles 26 are respectively arranged facing the lower filter plate 23 and the upper filter plate 24. With this structure, it is easy to provide high-pressure gas to achieve the purpose of cleaning the lower filter plate 23 and the upper filter plate 24 by blowing.

[0028] In one embodiment, several heat exchange straight tubes 7 are arranged in two rows, and each heat exchange straight tube 7 has a circular hole on the surface of the upper fin 19. This structure facilitates the passage of aluminum powder through the preheating unit 6 while increasing the heat exchange efficiency.

[0029] Working principle:

[0030] In use, the exhaust pipe 1 is first connected to the inlet 3 of the heat exchange box 2, so that the high-temperature flue gas is filtered by the lower filter plate 23 and the upper filter plate 24 of the filter unit 5 to remove dust. After being filtered by the filter unit 5, the high-temperature flue gas enters several heat exchange straight tubes 7. The high-temperature flue gas is first preheated by aluminum powder added in the preheating unit 6 through heat conduction through the heat exchange straight tubes 7 and the lower fins 20 on their lower surface. Then, the water in the water storage chamber 9 is heated by the heat exchange straight tubes 7 and the upper fins 19 on their upper surface. The exhaust shell 8 installed inside the water storage chamber 9 then conducts heat from the flue gas to the water in the water storage chamber 9 through heat conduction, so as to achieve full absorption of heat in the high-temperature flue gas and discharge it through the exhaust pipe. Water pipe 11 provides hot water for daily use in water storage chamber 9. At the same time, by activating high-pressure gas source 16, high-pressure gas is introduced into blowpipe 17. During this process, blowpipe valve 18 is intermittently opened and closed by control signal, causing high-pressure gas in blowpipe 17 to be intermittently released through several blowpipe nozzles 26. The blowpipe nozzles 26 clean the upper and lower filter plates inside filter unit 5. At this time, an industrial vacuum cleaner is connected to vacuum pipe 15. As the industrial vacuum cleaner is activated, dust particles blown into the filter unit 5 by high-pressure gas are absorbed through several vacuum nozzles 25, maintaining the filtration effect of lower filter plate 23 and upper filter plate 24.

[0031] 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 flue gas heat exchange structure for an aluminum smelting furnace, comprising a flue gas exhaust pipe (1) and a heat exchange box (2), characterized in that: A heat exchange box (2) is provided above the exhaust pipe (1), and a flue gas inlet (3) connected to the exhaust pipe (1) is provided at the bottom of the heat exchange box (2). The heat exchange box (2) is provided with a filter unit (5), a preheating unit (6) and a water storage chamber (9) arranged from bottom to top. The filter unit (5) is equipped with a lower filter plate (23) and an upper filter plate (24). The top of the filter unit (5) is connected to several heat exchange straight pipes (7). The lower surface of the heat exchange straight pipes (7) is provided with lower fins (20), and the lower fins (20) are located in the preheating unit (6). Inside, the upper surface of the heat exchange straight tube (7) is provided with upper fins (19), and the upper fins (19) are located inside the water storage cavity (9). The top of the heat exchange straight tube (7) is connected to the exhaust shell (8), and the exhaust shell (8) is located on the inner top surface of the water storage cavity (9). The top surface of the heat exchange box (2) is provided with an exhaust port (4) connected to the exhaust shell (8). The edge of the top surface of the preheating unit (6) is provided with an inlet (22), and the right side wall of the preheating unit (6) is connected to an outlet (13). The surface of the outlet (13) is equipped with a gate valve (14).

2. The flue gas heat exchange structure for an aluminum smelting furnace according to claim 1, characterized by: A high-pressure air source (16) is fixed on the side wall of the heat exchange box (2), and the outlet of the high-pressure air source (16) is connected to a blow pipe (17). A blow valve (18) is installed on the surface of the blow pipe (17), and one end of the blow pipe (17) extends between the lower filter plate (23) and the upper filter plate (24). A set of blow nozzles (26) are respectively provided on the upper and lower surfaces of the blow pipe (17). A dust suction pipe (15) is inserted and installed on the bottom surface of the heat exchange box (2), and several dust suction nozzles (25) connected to the filter unit (5) are provided at the upper end of the dust suction pipe (15). The lower end of the dust suction pipe (15) is connected to an external industrial vacuum cleaner.

3. The flue gas heat exchange structure for an aluminum smelting furnace according to claim 1, characterized by: The preheating unit (6) is a trapezoidal structure, and a sealing cover is hinged at the feed inlet (22) of the preheating unit (6). A motor (12) is fixedly installed on the surface of the preheating unit (6), and a piercing roller (21) is fixed at the output end of the motor (12) through a coupling. The piercing roller (21) is located on the lower inner side of the preheating unit (6).

4. The flue gas heat exchange structure for an aluminum smelting furnace according to claim 1, characterized by: The heat exchange box (2) is provided with an inlet pipe (10) connected to the water storage chamber (9) on the upper left side, and an outlet pipe (11) connected to the water storage chamber (9) is provided on the upper right side of the heat exchange box (2). Valves are installed on the surface of the inlet pipe (10) and the outlet pipe (11).

5. The flue gas heat exchange structure for an aluminum smelting furnace according to claim 2, characterized in that: The high-pressure air source (16) is specifically a high-pressure pulse air compressor, and the two sets of nozzles (26) are respectively positioned facing the lower filter plate (23) and the upper filter plate (24).

6. The flue gas heat exchange structure for an aluminum smelting furnace according to claim 1, characterized in that: Several heat exchange tubes (7) are arranged in two rows, and each heat exchange tube (7) has a round hole on the surface of the upper fin (19).

Images