Waste heat recovery device of secondary aluminum smelting furnace

Abstract

The utility model provides a waste heat recovery device of a secondary aluminum smelting furnace, and relates to the field of aluminum smelting furnaces. The waste heat recovery device of the secondary aluminum smelting furnace comprises a container, an air inlet channel, a tower body and an exhaust channel, the air inlet channel, the tower body and the exhaust channel are sequentially communicated, a water pipe A and a water pipe B are installed in the channel of the tower body, and a water supply pipe is fixedly installed on one side of the tower body, communicated with the container and used for supplying water to the container; according to the waste heat recovery device for the secondary aluminum smelting furnace, when the waste heat temperature and the waste gas amount in the tower body are reduced, the rotating plate and the movable plate form a sealing structure to seal the gas outlet of the tower body, so that the flow rate of waste gas is reduced, the retention time of the waste gas in the tower body is prolonged, and water supply and water pumping are stopped; the situation that water in the container does not fully absorb heat and reaches the preset temperature and then is rapidly discharged is avoided, the water in the container can continue to work circularly, and the waste heat recovery efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of aluminum furnaces, specifically a waste heat recovery device for recycled aluminum furnaces. Background Technology

[0002] An aluminum melting furnace is a piece of equipment developed based on the aluminum smelting process. It is mainly used for melting and holding aluminum ingots. It can meet the requirements of strict alloy composition, discontinuous production, and large single furnace capacity in the aluminum smelting process. It has the characteristics of high efficiency and energy saving, which can reduce consumption, reduce burn-off, improve product quality, reduce labor intensity, improve working conditions, and increase production efficiency. The smelting of aluminum requires a lot of energy to heat the aluminum raw materials to the melting point. Through waste heat recovery, the heat in the high-temperature exhaust gas discharged from the furnace can be recovered and reused for preheating aluminum raw materials or combustion air, etc. This can increase the initial temperature of the materials entering the furnace, thereby reducing the amount of fuel used during smelting and thus reducing energy consumption.

[0003] In a waste heat recovery device for recycled aluminum furnaces, if a pipeline heat exchanger is used, high-temperature waste gas is transported to the heat exchanger in contact with liquid water via a circulating pump. Inside the heat exchanger, the high-temperature waste gas transfers heat to the liquid water, its own temperature decreases, and then it returns to the evaporator to continue absorbing waste heat. This cycle repeats continuously, achieving the goal of continuously utilizing waste heat to heat liquid water.

[0004] Traditional waste heat recovery devices for recycled aluminum furnaces rely primarily on large temperature differences to achieve rapid heat transfer. When the recycled aluminum furnace operates at low load, the amount of aluminum scrap input is small, and the amount of fuel burned is correspondingly reduced, resulting in less heat generation and a lower waste heat temperature. This leads to a smaller temperature difference between the waste heat and the heated liquid water. Since the water in the waste heat recovery device is in a continuous circulation state, under low load conditions, due to insufficient waste heat temperature, the water in the container is quickly discharged before it has fully absorbed heat and reached the predetermined temperature. This not only results in extremely low waste heat recovery efficiency and an inability to effectively utilize the limited waste heat generated by the furnace, but also causes a significant waste of energy. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a waste heat recovery device for recycled aluminum furnaces, which solves the problem that when the waste heat temperature is insufficient, the water in the container is quickly discharged before it has fully absorbed heat and reached the predetermined temperature.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery device for a recycled aluminum furnace, comprising a container and an air inlet channel, a tower body, and an exhaust channel connected in sequence. Water pipes A and B are installed in the channel of the tower body. A water supply pipe is fixedly installed on one side of the tower body. The water supply pipe is connected to the container and is used to supply water to the container. The supplied water circulates in the container, water pipe A, and water pipe B. The portions of water pipes A and B located in the tower body each contain several interconnected serpentine pipes to increase the contact area between water pipes A and B and the channel, ensuring that the water has sufficient time to be heated.

[0007] The container is connected to a water extraction pipe for drawing hot water. Both the water extraction pipe and the water supply pipe are equipped with butterfly valves. At one end of the tower body near the exhaust channel, there are staggered fixed plates and movable plates. There are several fixed plates and movable plates. The fixed plates are fixed to the channel of the tower body. A rotating rod is rotatably connected inside the tower body. The rotating rod is rotatably connected to the fixed plate and fixedly connected to the movable plate. The position of the fixed plate is fixed. The movable plate is driven to rotate by the rotating rod. When the movable plate and the fixed plate are on the same horizontal plane, they form a sealing structure and seal the exhaust end of the tower body. When the rotating rod rotates, it controls the butterfly discs of the two butterfly valves to rotate through the valve stem.

[0008] Preferably, the water pump is connected to an external water pump to extract the hot water from the container.

[0009] Preferably, the container is connected to an exhaust pipe, and a one-way valve is provided inside the exhaust pipe.

[0010] Preferably, the other end of water pipe A and water pipe B is connected to water pipe C, and a circulation pump is installed on water pipe C.

[0011] Preferably, the fixed plate has an exhaust groove inside, an elastic sheet is fixedly connected inside the exhaust groove, and a baffle for sealing the exhaust groove is fixedly connected to the free end of the elastic sheet.

[0012] Preferably, the rotating rod passes through the tower body, with one end connected to an external power source and the other end fixedly connected to the valve stem.

[0013] Compared with the prior art, this utility model has the following beneficial effects: When the waste heat temperature and waste gas volume inside the tower decrease, the rotating plate and the movable plate form a sealing structure to seal the gas outlet of the tower, reducing the flow rate of the waste gas and increasing the residence time of the waste gas inside the tower. Moreover, the water supply and pumping work stops, preventing the water in the container from being discharged rapidly before it has fully absorbed heat and reached the predetermined temperature. In addition, the water in the container can continue to circulate, improving the waste heat recovery efficiency. When the waste gas volume and waste heat temperature increase, the movable plate is in an inclined state, increasing the discharge volume of waste gas. The water supply and pumping work can still be carried out normally, improving the waste heat recovery efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a sectional view of the tower body of this utility model from the front view;

[0016] Figure 3 This is a structural diagram of the present invention when the fixed plate and the movable plate are parallel;

[0017] Figure 4 This is a schematic diagram of the structure of the movable plate of this utility model when it is tilted;

[0018] Figure 5 This is a sectional view of the front view of the container of this utility model;

[0019] Figure 6 This is a cross-sectional view of the butterfly valve of this utility model when it blocks the water supply pipe;

[0020] Figure 7 This is a cross-sectional view of the fixing plate, elastic sheet, and baffle of this utility model.

[0021] The components are: 1. Container; 2. Air inlet channel; 3. Tower body; 4. Exhaust channel; 5. Water pipe A; 6. Water pipe B; 7. Water supply pipe; 8. Butterfly valve; 9. Fixed plate; 10. Movable plate; 11. Rotating rod; 12. Water pumping pipe; 13. Exhaust pipe; 14. Water pipe C; 15. Circulating pump; 16. Exhaust trough; 17. Elastic sheet; 18. Baffle; 19. Valve stem. Detailed Implementation

[0022] like Figures 1-7 As shown, a waste heat recovery device for a recycled aluminum furnace includes a container 1 and an air inlet channel 2, a tower body 3, and an exhaust channel 4 connected in sequence. An exhaust pipe 13 is connected to the container 1, and a one-way valve is installed inside the exhaust pipe 13. When the water in the container 1 boils, a large amount of water vapor is generated, increasing the pressure inside the container 1. The exhaust pipe 13 can discharge some of the gas to release the pressure and prevent excessive pressure from damaging the container 1. Water pipes A5 and B6 are installed in the channel of the tower body 3, and the other ends of water pipes A5 and B6 are connected to... There is a water pipe C14, on which a circulation pump 15 is installed. The circulation pump 15 provides power for water circulation. A water supply pipe 7 is fixedly installed on one side of the tower body 3. The water supply pipe 7 is connected to the container 1 and is used to supply water to the container 1. The supplied water is used to circulate in the container 1, water pipe A5, and water pipe B6. The parts of water pipe A5 and water pipe B6 located in the tower body 3 each contain several interconnected serpentine pipes to increase the contact area between water pipe A5 and water pipe B6 and the channel, ensuring that the water has sufficient time to be heated.

[0023] A water extraction pipe 12 is connected to container 1 for extracting hot water. The water extraction pipe 12 is connected to an external water pump to extract the hot water from container 1. Both the water extraction pipe 12 and the water supply pipe 7 are equipped with butterfly valves 8. At one end of the tower body 3 near the exhaust channel 4, there are staggered fixed plates 9 and movable plates 10. Several fixed plates 9 and movable plates 10 are provided. The fixed plates 9 are fixed to the channel of the tower body 3. An exhaust groove 16 is opened inside the fixed plate 9. An elastic plate 17 is fixedly connected inside the exhaust groove 16. The free end of the elastic plate 17 is fixedly connected to... A baffle 18 for sealing the exhaust trough 16 is connected. A rotating rod 11 is rotatably connected inside the tower body 3. The rotating rod 11 passes through the tower body 3 and is fixedly connected to the valve stem 19 at the other end. The rotating rod 11 is rotatably connected to the fixed plate 9 and fixedly connected to the movable plate 10. The position of the fixed plate 9 is fixed. The movable plate 10 is driven to rotate by the rotating rod 11. When the movable plate 10 and the fixed plate 9 are on the same horizontal plane, they form a sealing structure and seal the exhaust end of the tower body 3. When the rotating rod 11 rotates, it controls the butterfly discs of the two butterfly valves 8 to rotate through the valve stem 19.

[0024] In operation, the exhaust gas from the aluminum furnace is first transported to the inlet channel 2. The exhaust gas in the inlet channel 2 enters the tower body 3 and flows along the channels within the tower body 3, finally exiting through the exhaust channel 4. Then, the water supply pipe 7 is connected to an external water pump, which pumps water to the container 1. The water in the container 1 is then circulated through the circulation pump 15, flowing between the container 1, water pipe A5, and water pipe B6. Since parts of water pipes A5 and B6 are installed inside the tower body 3, the exhaust gas flows through the tower body 3... During the process, the waste heat of the exhaust gas can heat water pipes A5 and B6 to achieve waste heat recovery. The parts of water pipes A5 and B6 located in tower body 3 each contain several interconnected serpentine pipes to increase the contact area between water pipes A5 and B6 and the channel, ensuring that the water has sufficient time to be heated, thus improving the waste heat recovery efficiency. The heated water can enter container 1, and by connecting the water pump 12 to an external water pump, the water pump and water pump 12 will extract the heated water from container 1.

[0025] Subsequently, when the amount of raw materials fed into the aluminum furnace is small, the amount of waste gas produced will decrease, and the waste heat temperature of the waste gas will also decrease accordingly. At this time, if... Figure 3 and Figure 6 As shown, the rotating rod 11 is driven to rotate by an external motor, and the rotating rod 11 drives the movable plate 10 to rotate, moving the rotating plate from... Figure 4 The tilted state shown has changed to Figure 3As shown, in the horizontal position relative to the fixed plate 9, several rotating plates and movable plates 10 form a sealing structure, sealing the air outlet of the tower body 3 and blocking the exhaust gas. This reduces the exhaust gas flow rate and increases the residence time of the exhaust gas in the tower body 3, allowing the exhaust gas to utilize waste heat more fully to heat water pipes A5 and B6, thus improving waste heat recovery efficiency. At the same time, when the rotating rod 11 rotates, it drives the valve rod 19 to rotate, which in turn drives the butterfly valves 8 to rotate. At this time, the butterfly valves 8 block the water supply pipe 7 and the water pumping pipe 12 respectively, ceasing water supply and pumping to the container 1, preventing the water in the container 1 from not fully absorbing heat and reaching the predetermined temperature. The waste heat is quickly discharged, and the water in container 1 can continue to circulate, improving the waste heat recovery efficiency and effectively utilizing the limited waste heat generated by the furnace, thus improving energy utilization. It should be noted that when the gas pressure accumulated in the tower body 3 exceeds the predetermined value, the elastic sheet 17 deforms under force, and the baffle 18 in the movable plate 10 opens to release some of the gas pressure, preventing excessive gas pressure from damaging the tower body 3. When the amount of raw materials input into the aluminum furnace is large, the amount of waste gas generated will increase, and the waste heat temperature of the waste gas will also increase accordingly. The water can fully absorb heat without increasing the residence time of the waste gas, thus achieving waste heat recovery. At this time, the rotating rod 11 is driven by the motor to rotate, such as Figure 4 As shown, the rotating rod 11 drives the movable plate 10 to rotate and return to the inclined state, increasing the amount of exhaust gas discharged. The rotating rod 11 can also drive the butterfly discs of the two butterfly valves 8 to rotate through the valve rod 19, causing the butterfly discs of the two butterfly valves 8 to tilt, thereby enabling the water supply and pumping operations to proceed normally.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for a recycled aluminum furnace, comprising a container (1) and an air inlet channel (2), a tower body (3), and an exhaust channel (4) connected in sequence, characterized in that: Water pipe A (5) and water pipe B (6) are installed in the channel of the tower body (3). A water supply pipe (7) is fixedly installed on one side of the tower body (3). The water supply pipe (7) is connected to the container (1) and is used to supply water to the container (1). The supplied water is used to circulate in the container (1), water pipe A (5), and water pipe B (6). The container (1) is connected to a water pumping pipe (12) for extracting hot water. Both the water pumping pipe (12) and the water supply pipe (7) are equipped with butterfly valves (8). The tower body (3) is equipped with a fixed plate (9) and a movable plate (10) arranged in an alternating manner at one end near the exhaust channel (4). A rotating rod (11) is rotatably connected inside the tower body (3). The rotating rod (11) is rotatably connected to the fixed plate (9) and fixedly connected to the movable plate (10). The fixed plate (9) is fixed in position. The movable plate (10) is driven to rotate by the rotating rod (11). When the movable plate (10) and the fixed plate (9) are on the same horizontal plane, they form a sealing structure and seal the exhaust end of the tower body (3). When the rotating rod (11) rotates, it controls the butterfly discs of the two butterfly valves (8) to rotate through the valve stem (19).

2. The waste heat recovery device for a recycled aluminum furnace according to claim 1, characterized in that: The water pump (12) is connected to an external water pump and pumps out the hot water from the container (1).

3. The waste heat recovery device for a recycled aluminum furnace according to claim 1, characterized in that: The container (1) is connected to an exhaust pipe (13), and a one-way valve is provided inside the exhaust pipe (13).

4. The waste heat recovery device for a recycled aluminum furnace according to claim 1, characterized in that: The other end of the water pipes A (5) and B (6) is connected to a water pipe C (14), and a circulating pump (15) is installed on the water pipe C (14).

5. The waste heat recovery device for a recycled aluminum furnace according to claim 1, characterized in that: The fixed plate (9) has an exhaust groove (16) inside, and an elastic sheet (17) is fixedly connected inside the exhaust groove (16). A baffle (18) for sealing the exhaust groove (16) is fixedly connected to the free end of the elastic sheet (17).

6. The waste heat recovery device for a recycled aluminum furnace according to claim 1, characterized in that: The rotating rod (11) passes through the tower body (3), with one end connected to an external power source and the other end fixedly connected to the valve stem (19).

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