A flue gas waste heat recovery device for a heat conducting oil aluminum melting furnace

Abstract

This invention discloses a waste heat recovery device for flue gas from a thermal oil aluminum melting furnace, relating to the field of baking furnace technology. The device includes a furnace, with a support rod fixedly connected to the outer wall of the furnace and an exhaust pipe fixedly connected to the top of the furnace. A furnace opening and closing door is provided on the front of the exhaust pipe, and a waste heat recovery mechanism is installed inside the exhaust pipe. By setting up the waste heat recovery mechanism, while heat is exchanged through inclined heat-conducting plates, the rotation of the inclined heat-conducting plates dynamically disturbs and redistributes the uneven heat distribution of the high-temperature flue gas within the exhaust pipe, continuously reconstructing the flue gas flow field. Through the continuous rotation of each inclined heat-conducting plate within the exhaust pipe, it is ensured that each inclined heat-conducting plate uniformly contacts and exchanges heat with the flue gas at all locations within the exhaust pipe, significantly improving the overall heat transfer efficiency and waste heat recovery rate.

Description

Technical Field

[0001] This invention relates to the field of baking oven technology, specifically to a waste heat recovery device for flue gas from a thermal oil aluminum melting furnace. Background Technology

[0002] In industrial production, furnaces are indispensable key equipment in many processes, widely used in metal smelting, ceramic firing, and chemical raw material synthesis. During operation, furnaces continuously consume large amounts of fuel, such as coal, natural gas, and heavy oil, to maintain the high-temperature internal environment required to meet production process requirements.

[0003] A waste heat recovery device for flue gas from a thermal oil-fired aluminum melting furnace, as described in patent application CN213984621U, includes a thermal oil heat exchanger, an oil-water plate heat exchanger, and a water tank. The thermal oil heat exchanger is connected in parallel to an exhaust branch pipe connected to the aluminum melting furnace via a connected exhaust pipe. A first electric air valve is provided in the parallel section of the exhaust branch pipe, and a second electric air valve is provided at the exhaust inlet of the thermal oil heat exchanger. The oil-side inlet and outlet of the thermal oil heat exchanger are connected to the oil-side interface of the oil-water plate heat exchanger. The water-side inlet and outlet of the oil-water plate heat exchanger are connected to the water tank. The thermal oil heat exchanger transfers the waste heat from the flue gas to the thermal oil in the oil pipes of the thermal oil heat exchanger, and the oil-water plate heat exchanger transfers the heat from the thermal oil to the water in the water pipes of the oil-water plate heat exchanger.

[0004] These fuels produce a large amount of high-temperature flue gas during combustion. This high-temperature flue gas is usually discharged directly into the atmosphere through exhaust pipes. However, the high-temperature flue gas contains a large amount of heat energy, and direct discharge will cause huge energy waste, increase the production costs of enterprises, and also contradict the current industrial development concept of energy conservation, emission reduction and improving energy utilization efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a waste heat recovery device for flue gas from a thermal oil aluminum melting furnace, thereby achieving the goal of solving the aforementioned problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a waste heat recovery device for flue gas from a thermal oil aluminum melting furnace, comprising a furnace, a support rod fixedly connected to the outer wall of the furnace, an exhaust pipe fixedly connected to the top of the furnace, a furnace opening and closing door provided on the front of the exhaust pipe, and a waste heat recovery mechanism provided inside the exhaust pipe.

[0007] The waste heat recovery mechanism includes:

[0008] A rotating shaft, which is a circular cylindrical structure, has a first bearing sleeve rotatably connected to the top of the rotating shaft, and a fixed water inlet rod fixedly connected to the top of the first bearing sleeve. The end of the fixed water inlet rod away from the first bearing sleeve is fixedly connected to one side of the inner wall of the furnace.

[0009] The fixed water outlet rod and the fixed water inlet rod are both L-shaped rod structures. One end of the fixed water outlet rod is rotatably connected to a second bearing sleeve. The top of the second bearing sleeve is fixedly connected to the bottom of the rotating shaft. The end of the fixed water outlet rod away from the second bearing sleeve is fixedly connected to one side of the inner wall of the furnace. An inclined heat-conducting plate is provided on the outer wall of the rotating shaft.

[0010] Preferably, there are sixteen inclined heat-conducting plates, which are distributed in a circular array on the outer wall of the rotating shaft at equal intervals with the center of the rotating shaft as the point. One side of each inclined heat-conducting plate is fixedly connected to the outer wall of the rotating shaft.

[0011] Preferably, the inner wall of the rotating shaft is connected to the interior of the fixed water inlet rod through a first bearing sleeve, and the interior of the rotating shaft is connected to the interior of the fixed water outlet rod through a second bearing sleeve.

[0012] Preferably, the outer wall of the exhaust pipe is fixedly connected with a water inlet and a water outlet, the water inlet being internally connected to a fixed water inlet rod, and the water outlet being internally connected to a fixed water outlet rod.

[0013] Preferably, the inner wall of the inclined heat-conducting plate is provided with a sliding heat-conducting rod, which is slidably connected to the inner wall of the inclined heat-conducting plate. The inclined heat-conducting plate is provided with a built-in spring, one end of which is fixedly connected to one end of the sliding heat-conducting rod, and the other end of which is fixedly connected to the inner wall of the inclined heat-conducting plate.

[0014] Preferably, a first filter screen is provided on one side of the inclined heat-conducting plate. The first filter screen is triangular in shape and has filter holes on its inner wall.

[0015] Preferably, the outer wall of the sliding heat-conducting rod is provided with a dynamic adjustment mechanism, the dynamic adjustment mechanism including a fixing strip, one end of the fixing strip being fixedly connected to the outer wall of the sliding heat-conducting rod, and the other end of the fixing strip being fixedly connected to a fixing block, the fixing block being fixedly connected to the outer wall of the first filter screen.

[0016] Preferably, a second filter screen is fixedly connected to the top of the rotating shaft, and both the second filter screen and the first filter screen have filter holes on their surfaces. A limit strip is fixedly connected to the bottom of the inclined heat-conducting plate, and a sliding block is slidably connected to the bottom of the limit strip.

[0017] Preferably, a connector is fixedly connected to the outer wall of the sliding block, one end of the connector is fixedly connected to the bottom of the first filter screen, and a telescopic rod is provided on one side of the sliding block.

[0018] Preferably, one end of the telescopic rod is fixedly connected to the outer wall of the rotating shaft, and the other end of the telescopic rod is fixedly connected to the outer wall of the sliding block. A spring is provided inside the telescopic rod, and the telescopic rod is used to reset the sliding block.

[0019] This invention provides a waste heat recovery device for flue gas from a thermal oil-fired aluminum melting furnace. It has the following beneficial effects:

[0020] 1. This invention, by setting up a waste heat recovery mechanism, drives the rotating shaft to rotate clockwise between the upper and lower first bearing sleeves and the second bearing sleeve. This achieves dynamic disturbance and redistribution of the uneven heat distribution of the high-temperature flue gas in the exhaust pipe by using the rotation of the inclined heat conduction plates while exchanging heat through them. This continuously reconstructs the flue gas flow field. Through the continuous rotation of each inclined heat conduction plate in the exhaust pipe, it is ensured that each inclined heat conduction plate is in uniform contact with the flue gas in all positions in the exhaust pipe, which greatly improves the overall heat transfer efficiency and waste heat recovery rate.

[0021] 2. By setting up a waste heat recovery mechanism, when the inclined heat-conducting plate continues to rotate, the residue material attached to its surface by the flue gas is continuously thrown off due to the centrifugal effect and discharged with the rising airflow of the flue gas. Even if it is not completely thrown off, it will be thrown laterally to the end of the inclined heat-conducting plate away from the center of the rotation axis by the centrifugal swing of the inclined heat-conducting plate. This avoids the accumulation of a large amount of residue on the inclined heat-conducting plate to form a surface insulation layer that hinders heat conduction, and ensures that the heat exchange surface of the inclined heat-conducting plate maintains high thermal conductivity for a long time. It also achieves the synergistic effect of dynamic self-cleaning mechanism and rotational turbulence.

[0022] 3. This invention incorporates a waste heat recovery mechanism with a built-in spring on the inner wall of the inclined heat-conducting plate. The built-in spring ejects a sliding heat-conducting rod inside the inclined heat-conducting plate. After ejection, the sliding heat-conducting rod extends the inclined heat-conducting plate and fits against the inner wall of the exhaust pipe. This avoids the problem that when the diameter of each exhaust pipe is slightly different, the length of the inclined heat-conducting plate cannot perfectly match the inner wall of the exhaust pipe, resulting in insufficient contact and heat exchange between the flue gas and the heat exchange structure. Thus, even if the diameter of each exhaust pipe is different, the inclined heat-conducting plate can accurately fit against the inner wall through the extension of the sliding heat-conducting rod, ensuring no dead angles in the heat exchange of the flue gas flow channel and guaranteeing the heat exchange efficiency of the flue gas.

[0023] 4. The present invention sets up a waste heat recovery mechanism, and a first filter screen is fixedly connected between each inclined heat conduction plate. The filter screen is opened through the filter holes in the inner wall of the first filter screen to intercept larger residues in the flue gas, thereby avoiding the wear caused by the larger residues directly hitting the surface of the inclined heat conduction plate, and avoiding the problem of larger residues adhering to the inclined heat conduction plate, which would cause the surface of the inclined heat conduction plate to be covered and affect the heat exchange efficiency.

[0024] 5. By setting a dynamic adjustment mechanism, the first filter screen rotates synchronously with the inclined heat-conducting plate, causing the intercepted residue to slide outward along the first filter screen under the action of centrifugal force, pushing away the filtered residue together, improving the filtration efficiency of the first filter screen and reducing clogging. At the same time, the residue slides along the guide of the first filter screen to the second filter screen at the end of the first filter screen and finally falls into the depression at the bottom of the second filter screen, realizing the centralized collection and automatic cleaning of residue. Under long-term operation, the second filter screen can still efficiently collect a large amount of residue, avoiding the increase in system operating resistance or the decrease in heat exchange performance due to residue accumulation.

[0025] 6. This invention, by setting up a dynamic adjustment mechanism, sacrifices some filtration accuracy in exchange for a larger flow cross-section under high-efficiency and high-flow flue gas emission conditions, thereby significantly reducing system back pressure and increasing flue gas throughput. This ensures that the more important flue gas flow rate and efficiency are guaranteed under these conditions, and avoids the risk of system overheating or equipment damage caused by blockage under high pressure. When the flue gas flow rate and temperature drop, the sliding block retracts under the reset force of the spring telescopic rod, causing the first filter to automatically reset and close, restoring the high-precision interception state. This achieves adaptive dynamic adjustment under all working conditions, and can achieve dynamic automatic adjustment with more advantages than disadvantages under each working condition.

[0026] 7. The present invention sets up a dynamic adjustment mechanism, in which the curved second filter screen serves as an extension of the first filter screen. When the sliding heat-conducting rod extends, the corresponding position of the first filter screen is pulled outward through the fixing strip and fixing block, thereby dynamically adjusting the interception angle of the first filter screen and the cross-section of the flue gas passage. This ensures that when the exhaust pipe has a different diameter, the extension length of the sliding heat-conducting rod changes synchronously through the fixing strip and fixing block, causing the first filter screen to deform and expand in a coordinated manner, so as to ensure that the exhaust pipes with different diameters always maintain the optimal interception efficiency and flow channel matching degree.

[0027] 8. This invention, by setting up a waste heat recovery mechanism, allows the second filter screen, which is originally in an upwardly bulging state, to gradually flatten as the first filter screen is pulled and expanded. The upward bulging of the second filter screen provides space for the first filter screen to be stretched. The bulging of the second filter screen not only serves as a collection ramp for residue to slide down, but also provides deformation allowance for the expansion of the first filter screen. This means that when the first filter screen is pulled open, it does not need to overcome the elasticity of the first filter screen, but is completed by the gradual flattening of the second filter screen. This ensures stable and low-resistance deformation during the expansion process, avoiding the problem of fatigue deformation leading to frequent replacement of the first filter screen, which would affect the efficiency of flue gas waste heat recovery. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2This is a schematic diagram of the waste heat recovery mechanism of the present invention. Figure 1 ;

[0030] Figure 3 This is a cross-sectional structural diagram of the waste heat recovery mechanism of the present invention;

[0031] Figure 4 This is a schematic diagram of the waste heat recovery mechanism of the present invention. Figure 2 ;

[0032] Figure 5 This is a schematic diagram of the disassembled structure of the waste heat recovery mechanism of the present invention;

[0033] Figure 6 This is a schematic diagram of the waste heat recovery mechanism of the present invention. Figure 3 ;

[0034] Figure 7 For the present invention Figure 3 Enlarged view of point A;

[0035] Figure 8 For the present invention Figure 4 Enlarged view of point A.

[0036] Figure 9 This is a schematic diagram of the dynamic adjustment mechanism of the present invention.

[0037] In the diagram: 1. Furnace; 2. Support rod; 3. Waste heat recovery mechanism; 301. Rotating shaft; 302. First bearing sleeve; 303. Fixed water inlet rod; 304. Second bearing sleeve; 305. Fixed water outlet rod; 306. Water inlet head; 307. Water outlet head; 308. Inclined heat-conducting plate; 309. Sliding heat-conducting rod; 310. First filter screen; 311. Filter hole; 4. Dynamic adjustment mechanism; 401. Fixing strip; 402. Fixing block; 403. Second filter screen; 404. Limiting strip; 405. Sliding block; 406. Connecting piece; 407. Telescopic rod; 5. Exhaust pipe; 6. Furnace opening and closing door. Detailed Implementation

[0038] Example 1: Please refer to Figure 1-3 The present invention provides a technical solution: a waste heat recovery device for flue gas from a thermal oil aluminum melting furnace, including a furnace 1, a support rod 2 fixedly connected to the outer wall of the furnace 1, an exhaust pipe 5 fixedly connected to the top of the furnace 1, a furnace opening and closing door 6 provided on the front of the exhaust pipe 5, and a waste heat recovery mechanism 3 provided inside the exhaust pipe 5.

[0039] Waste heat recovery unit 3 includes:

[0040] A rotating shaft 301 is a circular cylindrical structure. A first bearing sleeve 302 is rotatably connected to the top of the rotating shaft 301. A fixed water inlet rod 303 is fixedly connected to the top of the first bearing sleeve 302. The end of the fixed water inlet rod 303 away from the first bearing sleeve 302 is fixedly connected to one side of the inner wall of the furnace 1.

[0041] The fixed water outlet rod 305 and the fixed water inlet rod 303 are both L-shaped rod structures. One end of the fixed water outlet rod 305 is rotatably connected to the second bearing sleeve 304. The top of the second bearing sleeve 304 is fixedly connected to the bottom of the rotating shaft 301. The end of the fixed water outlet rod 305 away from the second bearing sleeve 304 is fixedly connected to one side of the inner wall of the furnace 1. An inclined heat-conducting plate 308 is provided on the outer wall of the rotating shaft 301.

[0042] When in use, the high-temperature flue gas generated inside the furnace 1 is discharged outward through the exhaust pipe 5. It will exchange heat through the waste heat recovery mechanism 3 inside the exhaust pipe 5. The high-temperature flue gas passes through several inclined heat conduction plates 308 and transfers the high-temperature heat in the flue gas to the inclined heat conduction plates 308. It is then transferred to the rotating shaft 301 through the inclined heat conduction plates 308. Through the external water circulation system, the circulating cold water enters the fixed water inlet rod 303 through the water inlet head 306. After absorbing heat and heating up, the water enters the rotating shaft 301 through the fixed water inlet rod 303 and the first bearing sleeve 302. It then flows out through the second bearing sleeve 304, the fixed water outlet rod 305, and the water outlet head 307, thus completing the utilization of heat energy and realizing the waste heat recovery function of the flue gas inside the furnace 1.

[0043] Example 2: Please refer to Figure 1-5 Based on Embodiment 1, the present invention provides a technical solution:

[0044] Currently, most common furnace flue gas waste heat recovery devices employ fixed heat exchange structures, such as ordinary heat exchange tubes or plates. However, in practical applications, these fixed heat exchange structures present several problems. Firstly, due to the complex flow state of high-temperature flue gas within the exhaust pipe 5, uneven heat distribution exists. Fixed heat exchange structures cannot dynamically adjust the flue gas flow field, resulting in insufficient contact between the flue gas and the heat exchange structure in some areas, hindering effective heat transfer and leading to low overall heat transfer efficiency and waste heat recovery rate. Secondly, high-temperature flue gas often contains a certain amount of residue, which easily adheres to the surface of the heat exchange structure. Over time, this residue accumulates, forming an insulation layer that severely hinders heat conduction, further reducing the heat exchange performance of the structure and affecting waste heat recovery. Furthermore, the diameters of exhaust pipes 5 vary depending on their specifications. Existing fixed heat exchange structures cannot perfectly adapt to exhaust pipes 5 of various diameters, easily leading to gaps between the heat exchange structure and the inner wall of the exhaust pipe 5. This results in insufficient heat exchange between the flue gas and the heat exchange structure, creating heat exchange dead zones and reducing the heat exchange efficiency of the flue gas. In addition, larger residue particles in the high-temperature flue gas will directly impact the surface of the heat exchange structure during flow, easily causing wear and shortening its service life. At the same time, larger residues adhering to the heat exchange structure will also affect the heat exchange efficiency. There are sixteen inclined heat conduction plates 308, which are equidistantly arranged in a ring array around the center of the rotating shaft 301 on the outer wall of the rotating shaft 301. One side of the inclined heat conduction plates 308 is fixedly connected to the outer wall of the rotating shaft 301.

[0045] The inner wall of the rotating shaft 301 is connected to the interior of the fixed water inlet rod 303 through the first bearing sleeve 302, and the interior of the rotating shaft 301 is connected to the interior of the fixed water outlet rod 305 through the second bearing sleeve 304.

[0046] The outer wall of the exhaust pipe 5 is fixedly connected to a water inlet head 306 and a water outlet head 307. The water inlet head 306 is internally connected to the fixed water inlet rod 303, and the water outlet head 307 is internally connected to the fixed water outlet rod 305.

[0047] A sliding heat-conducting rod 309 is provided on the inner wall of the inclined heat-conducting plate 308. The sliding heat-conducting rod 309 is slidably connected in the inner wall of the inclined heat-conducting plate 308. An internal spring is provided inside the inclined heat-conducting plate 308. One end of the internal spring is fixedly connected to one end of the sliding heat-conducting rod 309, and the other end of the internal spring is fixedly connected to the inner wall of the inclined heat-conducting plate 308.

[0048] A first filter screen 310 is provided on one side of the inclined heat-conducting plate 308. The first filter screen 310 is triangular in shape, and filter holes 311 are opened on the inner wall of the first filter screen 310.

[0049] During the heat exchange process using the inclined heat-conducting plates 308, there are a large number of inclined heat-conducting plates 308 arranged in a ring array. When the flue gas is rapidly discharged under high pressure, the flue gas will push several inclined heat-conducting plates 308. Since the inclined heat-conducting plates 308 are curved, they will be pushed when the high-temperature flue gas rises rapidly under high pressure. This will drive the rotating shaft 301 to rotate clockwise between the upper and lower first bearing sleeve 302 and the second bearing sleeve 304. This achieves heat exchange through the inclined heat-conducting plates 308, while using the rotation of the inclined heat-conducting plates 308 to dynamically disturb and redistribute the uneven heat distribution of the high-temperature flue gas in the exhaust pipe 5. This allows the flue gas flow field to be continuously reconstructed. Through the continuous rotation of each inclined heat-conducting plate 308 in the exhaust pipe 5, it is ensured that each inclined heat-conducting plate 308 is in uniform contact with the flue gas at all positions in the exhaust pipe 5, which greatly improves the overall heat transfer efficiency and waste heat recovery rate.

[0050] Meanwhile, as the inclined heat-conducting plate 308 continues to rotate, the residue on its surface that is attached to the flue gas is continuously detached due to the centrifugal effect and discharged with the rising airflow of the flue gas. Even if it is not completely detached, the residue will be flung laterally to the end of the inclined heat-conducting plate 308 away from the center of the rotating shaft 301 as the inclined heat-conducting plate 308 is centrifugally swung. This prevents the inclined heat-conducting plate 308 from accumulating a large amount of residue to form a surface insulation layer that would hinder heat conduction, ensuring that the heat exchange surface of the inclined heat-conducting plate 308 maintains high thermal conductivity for a long time. It also achieves the synergistic effect of dynamic self-cleaning mechanism and rotational turbulence.

[0051] An internal spring is installed on the inner wall of the inclined heat-conducting plate 308. The internal spring in the inclined heat-conducting plate 308 will pop out the sliding heat-conducting rod 309 inside the inclined heat-conducting plate 308. After the sliding heat-conducting rod 309 pops out, it will act as an extension of the inclined heat-conducting plate 308 and fit against the inner wall of the exhaust pipe 5. This avoids the problem that the length of the inclined heat-conducting plate 308 cannot perfectly match the inner wall of the exhaust pipe 5 when the diameter of each exhaust pipe 5 is slightly different, which would cause the flue gas and the heat exchange structure to not fully contact each other for heat exchange. Thus, even if the diameter of each exhaust pipe 5 is different, the inclined heat-conducting plate 308 can accurately fit against the inner wall through the extension of the sliding heat-conducting rod 309, ensuring that there are no dead corners in the heat exchange of the flue gas flow channel and ensuring the heat exchange efficiency of the flue gas.

[0052] Each inclined heat conduction plate 308 is fixedly connected to a first filter screen 310. The filter holes 311 opened on the inner wall of the first filter screen 310 intercept larger residues in the flue gas, so as to avoid the larger residues directly hitting the surface of the inclined heat conduction plate 308 and causing wear, and to avoid the problem of larger residues adhering to the inclined heat conduction plate 308, which would cause the surface of the inclined heat conduction plate 308 to be covered and affect the heat exchange efficiency.

[0053] Example 3: Please refer to Figure 1-9 Based on Embodiments 1 and 2, this invention provides a technical solution: Existing flue gas filter screens are typically fixedly installed. During long-term operation, the residue trapped on the filter screen accumulates, causing blockage and a significant decrease in filtration efficiency. This not only increases the system's operating resistance and affects the normal flow of flue gas, but also reduces waste heat recovery efficiency. Furthermore, the residue accumulated on the filter screen requires regular manual cleaning, which increases maintenance costs and workload, and may lead to system malfunctions or even equipment failure if cleaning is not done in a timely manner.

[0054] In industrial production, different processing steps generate flue gas at varying temperatures, and the emission rates and efficiencies of this flue gas also differ. Existing equipment often cannot adjust in a timely manner when high-efficiency, high-flow-rate flue gas emissions are required. The fixed structure of the filter screen and flow channel design leads to increased system back pressure and reduced flue gas throughput under high flow rates and pressures, severely impacting emission efficiency. Furthermore, high pressure can exacerbate filter clogging, potentially causing system overheating or equipment damage. When the flue gas velocity and temperature decrease, the equipment cannot automatically return to a state suitable for low-flow-rate conditions, failing to achieve adaptive dynamic adjustment under all operating conditions.

[0055] The diameter of exhaust pipes 5 varies in different industrial scenarios. Existing waste heat recovery and filtration devices have fixed filter screen and flow channel structure dimensions, making it difficult to adapt to exhaust pipes 5 with different diameters. When the device is installed in an incompatible exhaust pipe 5, there will be gaps between the filter screen and the inner wall of the pipe, causing some flue gas to pass directly without being filtered by the filter screen, reducing the filtration effect. At the same time, the mismatch between the flow channel cross-section and the flue gas flow rate will also affect the flow of flue gas and the efficiency of waste heat recovery. Moreover, if devices of different sizes are customized to adapt to different pipes, it will increase production costs and inventory management difficulties. Therefore, a dynamic adjustment mechanism 4 is provided on the outer wall of the sliding heat conduction rod 309. The dynamic adjustment mechanism 4 includes a fixing strip 401. One end of the fixing strip 401 is fixedly connected to the outer wall of the sliding heat conduction rod 309, and the other end of the fixing strip 401 is fixedly connected to a fixing block 402. The fixing block 402 is fixedly connected to the outer wall of the first filter screen 310.

[0056] A second filter screen 403 is fixedly connected to the top of the rotating shaft 301. Both the second filter screen 403 and the first filter screen 310 have filter holes 311 on their surfaces. A limit strip 404 is fixedly connected to the bottom of the inclined heat-conducting plate 308. A sliding block 405 is slidably connected to the bottom of the limit strip 404.

[0057] A connector 406 is fixedly connected to the outer wall of the sliding block 405. One end of the connector 406 is fixedly connected to the bottom of the first filter screen 310. A telescopic rod 407 is provided on one side of the sliding block 405.

[0058] One end of the telescopic rod 407 is fixedly connected to the outer wall of the rotating shaft 301, and the other end of the telescopic rod 407 is fixedly connected to the outer wall of the sliding block 405. A spring is provided inside the telescopic rod 407, and the telescopic rod 407 is used to reset the sliding block 405.

[0059] The first filter screen 310 rotates synchronously with the inclined heat-conducting plate 308, causing the intercepted residue to slide outward along the first filter screen 310 under the action of centrifugal force, pushing away the filtered residue together, improving the filtration efficiency of the first filter screen 310 and reducing clogging. At the same time, the residue slides along the guide of the first filter screen 310 to the second filter screen 403 at the end of the first filter screen 310 and finally falls into the depression at the bottom of the second filter screen 403, realizing the centralized collection and automatic cleaning of the residue. Under long-term operation, the second filter screen 403 can still efficiently collect a large amount of residue, avoiding the increase in system operating resistance or the decrease in heat exchange performance due to residue accumulation.

[0060] Different processing operations result in flue gas at different temperatures and different emission efficiencies, leading to varying flue gas discharge velocities. When high-efficiency, high-flow-rate flue gas emission is required, the emission pressure is higher, thus accelerating the rotation of the inclined heat-conducting plate 308. The mass of the sliding block 405, a counterweight at the bottom of the inclined heat-conducting plate 308, moves the first filter screen 310 outward under centrifugal force via the connector 406. The sliding block 405 overcomes the spring force inside the telescopic rod 407, pushing the first filter screen 310 into the space between the rotating shafts 301. This allows the space where the first filter screen 310 was originally closed between the rotating shafts 301 to be opened when high-efficiency, high-flow-rate flue gas emission is required. The system automatically activates under high flow rates, sacrificing some filtration precision in exchange for a larger flow cross-section. This significantly reduces system back pressure and increases flue gas throughput, ensuring the more critical flue gas velocity and efficiency are maintained. It also avoids the risk of system overheating or equipment damage caused by blockage under high pressure. When the flue gas velocity and temperature drop, the sliding block 405 retracts under the reset force of the spring telescopic rod 407, causing the first filter screen 310 to automatically reset and close, restoring the high-precision interception state. This achieves adaptive dynamic adjustment under all operating conditions, ensuring that the benefits outweigh the drawbacks in each operating condition.

[0061] Meanwhile, the curved second filter 403 serves as an extension of the first filter 310. When the sliding heat-conducting rod 309 extends, it pulls the corresponding position of the first filter 310 outward through the fixing strip 401 and fixing block 402, thereby dynamically adjusting the interception angle of the first filter 310 and the cross-section of the flue gas passage. This ensures that when the exhaust pipe 5 has different diameters, the extension length of the sliding heat-conducting rod 309 changes synchronously through the fixing strip 401 and fixing block 402, causing the first filter 310 to deform and expand in linkage. This ensures that the exhaust pipe 5 with different diameters always maintains the optimal interception efficiency and flow channel matching.

[0062] The second filter screen 403 is originally in an upward bulging state. As the first filter screen 310 is pulled and expanded, the second filter screen 403 is gradually flattened. The upward bulging of the second filter screen 403 provides space for the first filter screen 310 to be stretched. The bulging of the second filter screen 403 not only serves as a collection ramp for residue to slide down, but also provides deformation margin for the expansion of the first filter screen 310. This means that when the first filter screen 310 is pulled open, it does not need to overcome the elasticity of the first filter screen 310, but is completed by the gradual flattening of the second filter screen 403. This ensures stable and low-resistance deformation during the expansion process and avoids the problem of fatigue deformation that requires frequent replacement of the first filter screen 310, which would affect the efficiency of flue gas waste heat recovery.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A waste heat recovery device for flue gas from a thermal oil aluminum melting furnace, comprising a furnace (1), wherein a support rod (2) is fixedly connected to the outer wall of the furnace (1), and an exhaust pipe (5) is fixedly connected to the top of the furnace (1), wherein a furnace opening and closing door (6) is provided on the front of the exhaust pipe (5), characterized in that: The exhaust pipe (5) is equipped with a waste heat recovery mechanism (3); the waste heat recovery mechanism (3) includes: a rotating shaft (301), the rotating shaft (301) is a circular cylindrical structure, the top of the rotating shaft (301) is rotatably connected to a first bearing sleeve (302), the top of the first bearing sleeve (302) is fixedly connected to a fixed water inlet rod (303), the end of the fixed water inlet rod (303) away from the first bearing sleeve (302) is fixedly connected to one side of the inner wall of the furnace (1); and a fixed water outlet. The fixed water outlet rod (305) and the fixed water inlet rod (303) are both L-shaped rod structures. One end of the fixed water outlet rod (305) is rotatably connected to a second bearing sleeve (304). The top of the second bearing sleeve (304) is fixedly connected to the bottom of the rotating shaft (301). The end of the fixed water outlet rod (305) away from the second bearing sleeve (304) is fixedly connected to one side of the inner wall of the furnace (1). An inclined heat-conducting plate (308) is provided on the outer wall of the rotating shaft (301). A sliding heat-conducting rod (309) is provided on the inner wall of the inclined heat-conducting plate (308). The sliding heat-conducting rod (309) is slidably connected in the inner wall of the inclined heat-conducting plate (308). An internal spring is provided inside the inclined heat-conducting plate (308). One end of the internal spring is fixedly connected to one end of the sliding heat-conducting rod (309), and the other end of the internal spring is fixedly connected to the inner wall of the inclined heat-conducting plate (308). A first filter screen (310) is provided on one side of the inclined heat-conducting plate (308). The first filter screen (310) is triangular in shape, and filter holes (311) are opened on the inner wall of the first filter screen (310). The outer wall of the sliding heat-conducting rod (309) is provided with a dynamic adjustment mechanism (4). The dynamic adjustment mechanism (4) includes a fixing strip (401). One end of the fixing strip (401) is fixedly connected to the outer wall of the sliding heat-conducting rod (309), and the other end of the fixing strip (401) is fixedly connected to a fixing block (402). The fixing block (402) is fixedly connected to the outer wall of the first filter screen (310). The top of the rotating shaft (301) is fixedly connected to a second filter screen (403), and both the second filter screen (403) and the first filter screen (310) have filter holes (311) on their surfaces. The bottom of the inclined heat-conducting plate (308) is fixedly connected to a limiting strip (404), and a sliding block (405) is slidably connected to the bottom of the limiting strip (404). A connector (406) is fixedly connected to the outer wall of the sliding block (405). One end of the connector (406) is fixedly connected to the bottom of the first filter screen (310). A telescopic rod (407) is provided on one side of the sliding block (405). One end of the telescopic rod (407) is fixedly connected to the outer wall of the rotating shaft (301), and the other end of the telescopic rod (407) is fixedly connected to the outer wall of the sliding block (405). A spring is provided inside the telescopic rod (407), and the telescopic rod (407) is used to reset the sliding block (405).

2. The waste heat recovery device for flue gas from a thermal oil-fired aluminum melting furnace according to claim 1, characterized in that: The number of inclined heat-conducting plates (308) is sixteen. The sixteen inclined heat-conducting plates (308) are equidistant and arranged in a ring array around the center of the rotating shaft (301) on the outer wall of the rotating shaft (301). One side of the inclined heat-conducting plate (308) is fixedly connected to the outer wall of the rotating shaft (301).

3. The waste heat recovery device for flue gas from a thermal oil-fired aluminum melting furnace according to claim 2, characterized in that: The inner wall of the rotating shaft (301) is connected to the interior of the fixed water inlet rod (303) through the first bearing sleeve (302), and the interior of the rotating shaft (301) is connected to the interior of the fixed water outlet rod (305) through the second bearing sleeve (304).

4. The waste heat recovery device for flue gas from a thermal oil aluminum melting furnace according to claim 3, characterized in that: The outer wall of the exhaust pipe (5) is fixedly connected to a water inlet (306) and a water outlet (307). The water inlet (306) is internally connected to the fixed water inlet rod (303), and the water outlet (307) is internally connected to the fixed water outlet rod (305).

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