Waste aluminum treatment production line waste heat comprehensive utilization system and method

Abstract

The application relates to the technical field of waste heat recovery, in particular to a waste heat comprehensive utilization system and method for a waste aluminum treatment production line. When high-temperature waste gas passes through a first pipeline 11, the high-temperature waste gas is subjected to heat exchange through a first heat collection unit 1, and preset gas is subjected to filtering treatment through a filtering unit 2; when the filtered gas enters a second pipeline 12, the stable temperature of the filtered gas is monitored, whether to supply heat to a second preset process is determined according to the stable temperature, and after the second preset process is supplied with heat, the filtered gas returns to a third pipeline 13; the filtered gas is subjected to secondary heat collection through a second heat collection unit 4 in the third pipeline 13, and second circulating water in the second heat collection unit 4 is also flowed into a third preset process for heat exchange; first circulating water of the first heat collection unit 1 and second circulating water passing through the third preset process are transported to a treatment unit 6, and low-pressure steam is obtained. The application solves the problem of low waste heat recovery efficiency and improves the waste heat recovery efficiency.

Description

Technical Field

[0001] This application relates to the field of waste heat recovery technology, and in particular to a system and method for comprehensive utilization of waste heat from a waste aluminum processing production line. Background Technology

[0002] In scrap aluminum processing lines, processes such as smelting generate large amounts of high-temperature waste gas containing abundant thermal energy. However, in traditional scrap aluminum processing, this high-temperature waste gas is often directly discharged into the atmosphere, resulting in a significant waste of thermal energy. Furthermore, the waste gas may contain harmful substances, such as pre-existing gases. If these substances are discharged directly without treatment, they will pollute the environment and disrupt the balance of the ecosystem. A similar prior art is Chinese patent CN111457723A, which proposes an energy-saving and waste heat recovery process for recycled aluminum smelting, including the following steps: S1, recycled aluminum is smelted in a smelting furnace, and a waste heat recovery tank is installed on the top of the smelting furnace. The waste gas generated in the smelting process is filtered and discharged through the waste heat recovery tank. The heat of the waste gas is recovered through the waste heat recovery tank and the liquid water is heated into steam; S2, the steam is transported to a steam turbine through a pipeline, causing the steam turbine to rotate. The steam turbine drives a generator connected to the steam turbine to rotate, and the generator converts mechanical energy into electrical energy and continuously outputs it to the power grid; S3, the steam is discharged from the steam turbine and transported to a condenser through a pipeline. The steam condenses into liquid water in the condenser, and the liquid water is transported to a water pump through a pipeline. The water pump transports the liquid water back to the waste heat recovery tank in step S1. This process can recover the waste heat generated in the waste gas during the recycled aluminum smelting process and generate electricity from the waste heat, which has an energy-saving effect and can also effectively filter the waste gas. Furthermore, a similar prior art exists in Chinese Patent Publication No. CN118424005A, which discloses a waste heat recovery and utilization system for recycled aluminum smelting. This system includes a flue gas main pipe connected to a waste heat boiler, with the boiler's steam outlet connected to a steam accumulator. The steam accumulator's outlet is connected to a steam-water separator, which in turn connects to a steam turbine. The turbine is connected to a condenser, whose outlet is connected to the waste heat boiler. The waste heat boiler's exhaust port is connected to a dust collector. The flue gas main pipe is also connected to a bypass heat exchanger, whose outlet is connected to the dust collector. The bypass heat exchanger is connected in parallel with the waste heat boiler. Compared to existing technologies, the steam accumulator stabilizes the pressure and flow of the flue gas from the recycled aluminum smelting equipment, meeting the steam requirements for stable turbine production. While the technical solutions in the two patent documents mentioned above have solved the problem of waste heat recovery, their efficiency is not high enough. The purpose of this invention is to provide a comprehensive utilization system and method for a waste aluminum processing production line. This method can achieve efficient recovery and full utilization of waste heat through multi-stage heat collection and recycling, and has significant energy-saving and consumption-reducing effects. It is of great significance for promoting energy conservation and environmental protection in industrial production. Summary of the Invention

[0003] This application provides a method for the comprehensive utilization of waste aluminum processing production lines, the method comprising:

[0004] Step S1: During the waste aluminum processing, high-temperature waste gas will be generated after the first preset process. When the high-temperature waste gas passes through the first pipe 11, the high-temperature waste gas will be heat-exchanged by the first heat collection unit 1 and filtered by the filter unit 2 to obtain filtered gas. The first heat collection unit 1 is provided inside the first pipe 11 and the first heat collection unit 1 and the water pipe of the processing unit 6 are interconnected.

[0005] Step S2: When the filtered gas enters the second pipe 12, the stable temperature of the filtered gas is periodically monitored by the temperature monitoring unit. Based on the stable temperature, it is determined whether to supply heat to the second preset process. After supplying heat to the second preset process, the filtered gas returns to the third pipe 13.

[0006] Step S3: The filtered gas is subjected to secondary heat collection through the second heat collection unit 4 in the third pipe 13, and the second circulating water in the second heat collection unit 4 is returned to the third preset process for heat exchange.

[0007] Step S4: The first circulating water in the first heat collection unit 1 and the second circulating water that has undergone the third preset process are transported to the processing unit 6 to obtain low-pressure steam.

[0008] As a preferred technical solution of the present invention, in step S1:

[0009] The first heat collection unit 1 is located before the filter unit 2. The first heat collection unit 1 is a water circulation device. The filter unit 2 is a double-layer mesh structure. A chemical substance that can absorb a preset gas is placed in the middle of the double-layer mesh structure. The first circulating water in the first heat collection unit 1 absorbs the heat in the high-temperature waste gas and flows into the treatment unit 6.

[0010] As a preferred embodiment of the present invention, step S2 includes:

[0011] Step S21: When the filtered gas enters the second pipe 12 through the first pipe 11, the stable temperature of the filtered gas is periodically detected by the detection unit 3, wherein the stable temperature is the temperature of the filtered gas detected when the temperature difference of the filtered gas is within a preset range for N consecutive detections.

[0012] Step S22: When the stable temperature is greater than the first threshold, open the first gate 21 to supply heat to the second preset process through the filtered gas, and adjust the heating temperature of the second preset process by adjusting the closing width of the second gate 22, wherein the second pipeline 12 is separated from the equipment corresponding to the second preset process by the first gate 21.

[0013] When the stable temperature is less than the first threshold, the first gate 21 is closed and the second gate 22 is opened, so that the filtered gas directly enters the third pipe 13.

[0014] Step S23: After the filtered gas supplies heat to the second preset process, it returns to the third pipeline 13 through the third gate 23.

[0015] As a preferred embodiment of the present invention, step S3 includes:

[0016] Step S31: When the filtered gas passes through the third pipe 13, the filtered gas is subjected to secondary heat collection by the second heat collection unit 4. The second heat collection unit 4 is located in the middle of the third pipe 13 and has a ring pipe structure. The ring pipe structure contains second circulating water.

[0017] Step S32: After secondary heat collection of the second circulating water in the second heat collection unit 4, it enters the third preset process corresponding equipment 5. A water guide trough 24 is provided below the second heat collection unit 4 on the third pipe 13. When condensate is generated through the second heat collection unit 4, the condensate is discharged through the water guide trough 24. A water guide pipe is provided outside the water guide trough 24. The second heat collection unit 4 is directly connected to the water supply unit.

[0018] As a preferred embodiment of the present invention, step S4 includes:

[0019] The first circulating water in the first heat collection unit 1 and the second circulating water that has passed through the device 5 corresponding to the third preset process are transported to the processing unit 6, and low-pressure steam is generated by the processing unit 6. The flowing water in the processing unit 6 is then returned to the first heat collection unit 1 as the first circulating water.

[0020] As a preferred embodiment of the present invention, when the filtered gas passes through the second pipe 12, the concentration of the preset gas in the filtered gas is also detected by the detection unit 3, and when the concentration of the preset gas is greater than or equal to the preset concentration, the suction force of the suction unit is reduced to reduce the flow rate of the high-temperature exhaust gas. The suction unit is located inside the first pipe 11 and before the first heat collection unit 1.

[0021] As a preferred embodiment of the present invention, the processing unit 6 is a flash evaporation device.

[0022] This invention also provides a waste heat comprehensive utilization system for a waste aluminum processing production line, used to implement the above-mentioned method, the system comprising:

[0023] The first heat collection unit 1 is used to exchange heat with the high-temperature waste gas generated during the first preset process in the waste aluminum processing when it passes through the first pipe 11. The first heat collection unit 1 is provided inside the first pipe 11, and the first heat collection unit 1 and the water pipe of the processing unit 6 are interconnected.

[0024] Filter unit 2 is used to filter the high-temperature exhaust gas;

[0025] The detection unit 3 is used to periodically monitor the stable temperature of the filtered gas when it enters the second pipe 12, and determine whether to supply heat to the second preset process based on the stable temperature. After supplying heat to the second preset process, the filtered gas returns to the third pipe 13.

[0026] The second heat collection unit 4 is used for secondary heat collection of the filtered gas and to return the internal second circulating water to the third preset process for heat exchange.

[0027] Processing unit 6 is used to obtain low-pressure steam based on the first circulating water in the first heat collection unit 1 and the second circulating water that has passed through the device 5 corresponding to the third preset process.

[0028] The present invention also provides a computer-readable storage medium storing instructions that, when executed by a processor, implement the above-described method.

[0029] Effect

[0030] This invention utilizes a first heat collection unit 1 and a water circulation device to exchange heat with the large volume of high-temperature waste gas (over 700 degrees Celsius) generated during processes such as aluminum smelting. This absorbs heat from the waste gas. When the waste gas temperature is lower than a set temperature or the temperature of the first circulating water, the first circulating water can further heat the waste gas, ensuring it reacts fully with chemical substances in the subsequent filtration unit 2, improving the removal efficiency of the preset gas, and preventing condensation and pipe corrosion. Furthermore, when the filtered gas enters the second pipe 12, its stable temperature is periodically monitored by a detection unit 3. Based on the temperature, the system determines whether to supply heat to the second preset process and adjusts the gate accordingly. The system controls the heating temperature by adjusting the door opening, further improving the efficiency of waste heat utilization. Secondly, the system achieves multi-stage utilization of waste heat, reducing energy waste. After the filtered gas supplies heat to the second preset process, it also performs secondary heat collection through the second heat collection unit 4 in the third pipeline 13. The collected heat is used for heat exchange in the third preset process, helping to cool the molten aluminum liquid and form solid aluminum. This process not only fully absorbs the waste heat in the filtered gas but also saves water resources, because the second circulating water can be directly used in the third preset process after completing the secondary heat collection, without the need for additional cooling water. Finally, the system and method also have good economic and environmental benefits. By converting the collected heat into low-pressure steam, which can be used for various purposes such as power generation, heating, cooking, or humidification, waste heat is reused, reducing the energy costs of enterprises. At the same time, the processing unit 6 in the system can also return the flowing water that has not been converted into steam to the first heat collection unit 1 as the first circulating water, forming a closed loop, reducing water consumption and having good environmental benefits. Through the cooperation of the above technical solutions, and through multi-stage heat collection and recycling, efficient recovery and full utilization of waste heat are achieved, with significant energy-saving and consumption-reducing effects, which is of great significance for promoting energy conservation and environmental protection in industrial production. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a flowchart of the waste heat comprehensive utilization method of the waste aluminum processing production line of the present invention;

[0033] Figure 2 This is a schematic diagram of the waste heat recovery process of the waste heat comprehensive utilization system of the waste aluminum processing production line of the present invention.

[0034] Figure 3This is a flowchart illustrating how the present invention uses filtered gas to heat a second predetermined process.

[0035] Figure 4 This is a structural diagram of the waste heat comprehensive utilization system of the waste aluminum processing production line of the present invention;

[0036] Explanation of reference numerals in the attached figures:

[0037] 1: First heat collection unit; 2: Filtration unit; 3: Detection unit; 4: Second heat collection unit; 5: Equipment corresponding to the third preset process; 6: Processing unit; 11: First pipeline; 12: Second pipeline; 13: Third pipeline; 21: First gate; 22: Second gate; 23: Third gate; 24: Water guide channel. Detailed Implementation

[0038] This application provides a system and method for comprehensive utilization of waste heat from a waste aluminum processing production line. The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" or "having" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] For ease of understanding, the specific process of the embodiments of this application is described below, such as... Figure 1 As shown, one embodiment of a comprehensive utilization method for a waste aluminum processing production line in this application includes:

[0040] Step S1: During the waste aluminum processing, high-temperature waste gas will be generated after the first preset process. When the high-temperature waste gas passes through the first pipe 11, the high-temperature waste gas will be heat-exchanged by the first heat collection unit 1 and filtered by the filter unit 2 to obtain filtered gas. The first heat collection unit 1 is provided inside the first pipe 11 and the first heat collection unit 1 and the water pipe of the processing unit 6 are interconnected.

[0041] Specifically, the main processes in the waste aluminum processing include sorting, crushing, paint removal pretreatment, smelting, and ingot casting. During smelting, a large amount of high-temperature waste gas is generated, which is the aforementioned first pre-set process and also the main source of waste heat. The temperature of this high-temperature waste gas can reach over 700 degrees Celsius. When collecting heat from the high-temperature waste gas, it first passes through the first heat collection unit 1, which is a water circulation device. As the high-temperature waste gas passes through the first heat collection unit 1, it not only absorbs the heat emitted by the waste gas but also heats it at the beginning of the waste aluminum smelting process when the temperature of the high-temperature waste gas is lower than the aforementioned set temperature or the temperature of the first circulating water. To prevent condensation from forming when the high-temperature waste gas comes into contact with relatively cool pipes, which could corrode the pipes, and because the temperature needs to be higher than the aforementioned set temperature before the pre-set gas is removed through the filter unit 2, further measures are taken. The high-temperature exhaust gas can react with the chemical substances in the filter unit 2 to achieve the effect of filtering the preset gas. Therefore, when the temperature of the high-temperature exhaust gas is lower than the set temperature or lower than the temperature of the first circulating water in the first heat collection unit 1, the high-temperature exhaust gas can be heated by the first circulating water to improve the removal effect of the preset gas. When the temperature of the high-temperature exhaust gas is higher than the temperature of the first circulating water, the first heat collection unit 1 can collect the heat in the high-temperature exhaust gas and convert it into low-pressure steam by flowing into the treatment unit 6 through the outlet. The flowing water in the treatment unit 6 that has not been converted into steam is reused as the first circulating water and flows out through the outlet of the treatment unit 6 and flows into the first heat collection unit 1 through the inlet. Through the above technical solution, not only can the heat in the high-temperature exhaust gas be absorbed, but the efficient filtration of the preset gas can also be ensured, thereby preventing corrosion of the pipe through which the high-temperature exhaust gas passes.

[0042] Step S2: When the filtered gas enters the second pipe 12, the stable temperature of the filtered gas is periodically monitored by the temperature monitoring unit. Based on the stable temperature, it is determined whether to supply heat to the second preset process. After supplying heat to the second preset process, the filtered gas returns to the third pipe 13.

[0043] Specifically, when the filtered gas enters the second pipe 12 through the first pipe 11, the stable temperature of the filtered gas is detected in real time by the detection unit 3. That is, the temperature difference of the filtered gas is detected multiple times within the preset range. Since the temperature of the filtered gas, i.e., the high-temperature waste gas generated during the smelting process, can reach more than 700 degrees, while the temperature required for the paint removal pretreatment of waste aluminum is about 400 degrees, the filtered gas can be used to heat the paint removal pretreatment process, i.e., the second preset process, through a high-temperature resistant gas pipeline. Through the above technical solution, the heat of the filtered gas can be fully utilized to heat the second preset process, thereby improving the utilization rate of waste heat.

[0044] Step S3: The filtered gas is subjected to secondary heat collection through the second heat collection unit 4 in the third pipe 13, and the second circulating water in the second heat collection unit 4 is returned to the third preset process for heat exchange.

[0045] Specifically, since the filtered gas remains at a high temperature and carries a large amount of heat even after being heated in the second preset process, direct discharge would result in significant waste of heat. Therefore, when the filtered gas passes through the third pipe 13, the second heat collection unit 4 performs secondary heat collection on the filtered gas, ensuring sufficient absorption of heat. After the second circulating water performs secondary heat absorption on the filtered gas, the second circulating water enters through the inlet of the device 5 corresponding to the third preset process and flows out through the outlet of the device 5 corresponding to the third preset process. The aforementioned third preset process is the ingot casting process in the waste aluminum processing production line. During the ingot casting process, water is needed to cool the molten aluminum liquid to form solid aluminum. A large amount of heat is generated in this process. Although the aforementioned second circulating water is used for secondary heat collection, its temperature is far lower than that of the molten aluminum liquid. Therefore, in order to save water resources, the aforementioned second circulating water is used for waste heat collection in the aforementioned third preset process. Through the above technical solution, not only can the waste heat in the aforementioned filtered gas be fully absorbed, but the waste heat collection effect of waste aluminum processing can also be improved by using the aforementioned second circulating water for waste heat collection in the third preset process, and water resources are also saved.

[0046] Step S4: The first circulating water in the first heat collection unit 1 and the second circulating water that has undergone the third preset process are transported to the processing unit 6 to obtain low-pressure steam.

[0047] Specifically, by transporting the first circulating water carrying a large amount of heat and the second circulating water that has undergone the third preset process to the processing unit 6, and generating low-pressure steam through the processing unit 6, the low-pressure steam can be used for power generation, heating, cooking, or humidification, so that the waste heat can be fully reused. At the same time, the flowing water in the processing unit 6 that has not been converted into low-pressure steam is returned to the first heat collection unit 1 as the first circulating water to absorb heat again. Through the above technical solution, the waste heat generated in the waste aluminum processing production line can be fully utilized and the utilization rate of waste heat can be improved.

[0048] Furthermore, in step S1:

[0049] The first heat collection unit 1 is located before the filter unit 2. The first heat collection unit 1 is a water circulation device. The filter unit 2 is a double-layer mesh structure. A chemical substance that can absorb the preset gas is placed in the middle of the double-layer mesh structure. The first circulating water in the first heat collection unit 1 absorbs the heat in the high-temperature waste gas and flows into the treatment unit 6.

[0050] Specifically, during the waste aluminum processing, a large amount of high-temperature waste gas is generated during the waste aluminum smelting process, namely the first preset process mentioned above, which is also the main source of waste heat generation. The temperature of the generated high-temperature waste gas can reach over 700 degrees Celsius. Figure 2As shown, during the heat collection of high-temperature waste gas, it first passes through the first heat collection unit 1, which is a water circulation device. The inlet of the first heat collection unit 1 is connected to the outlet water pipe of the treatment unit 6, which is a flash tank. The water in the treatment unit 6 is hot water with a temperature higher than the set temperature. When the high-temperature waste gas passes through the first heat collection unit 1, it can not only absorb the heat emitted by the high-temperature waste gas, but also heat the high-temperature waste gas when the temperature is lower than the set temperature or the temperature of the first circulating water at the beginning of the aluminum smelting process. To prevent the high-temperature waste gas from generating condensate when it comes into contact with the relatively low-temperature pipe, which would cause corrosion when the condensate combines with the preset gas, and because the preset gas in the high-temperature waste gas needs to be at a temperature higher than the set temperature when it passes through the filter unit 2 to remove the preset gas, the high-temperature waste gas must be able to react with the filter unit 2. The chemical substances in Unit 2 react to achieve the effect of filtering the preset gas. Therefore, when the temperature of the high-temperature exhaust gas is lower than the set temperature or lower than the temperature of the first circulating water in the first heat collection unit 1, the high-temperature exhaust gas can be heated by the first circulating water to improve the removal effect of the preset gas. When the temperature of the high-temperature exhaust gas is higher than the temperature of the first circulating water, the first heat collection unit 1 can collect the heat in the high-temperature exhaust gas and convert it into low-pressure steam by flowing into the treatment unit 6 through the outlet. The flowing water in the treatment unit 6 that has not been converted into steam is reused as the first circulating water and flows out through the outlet of the treatment unit 6. It then flows into the first heat collection unit 1 through the inlet. Through the above technical solution, not only can the heat in the high-temperature exhaust gas be absorbed, but the efficient filtration of the preset gas can also be ensured, thereby preventing corrosion of the pipe through which the high-temperature exhaust gas passes.

[0051] Further, step S2 includes:

[0052] Step S21: When the filtered gas enters the second pipe 12 through the first pipe 11, the stable temperature of the filtered gas is periodically detected by the detection unit 3, wherein the stable temperature is the temperature of the filtered gas detected when the temperature difference of the filtered gas is within a preset range for N consecutive detections.

[0053] Step S22: When the stable temperature is greater than the first threshold, open the first gate 21 to supply heat to the second preset process through the filtered gas, and adjust the heating temperature of the second preset process by adjusting the closing width of the second gate 22, wherein the second pipeline 12 is separated from the equipment corresponding to the second preset process by the first gate 21.

[0054] When the stable temperature is less than the first threshold, the first gate 21 is closed and the second gate 22 is opened, so that the filtered gas directly enters the third pipe 13.

[0055] Step S23: After the filtered gas supplies heat to the second preset process, it returns to the third pipeline 13 through the third gate 23.

[0056] Specifically, such as Figure 4 As shown, when the filtered gas enters the second pipe 12 through the first pipe 11, the stable temperature of the filtered gas is detected in real time by the detection unit 3. Specifically, the temperature difference of the filtered gas is detected N times consecutively within the preset range, meaning the temperature difference between any two detected temperatures within N consecutive times is within the preset range. The preset range can be less than or equal to 10 degrees Celsius, where N is a positive integer greater than or equal to 4, and the detection period is 1 second. Since the filtered gas, i.e., the high-temperature waste gas generated during the smelting process, can reach temperatures as high as 700 degrees Celsius, and the required temperature for the paint stripping pretreatment of waste aluminum is around 400 degrees Celsius, the filtered gas can be supplied with heat to the paint stripping pretreatment process (i.e., the second preset process) through a high-temperature resistant gas pipeline. That is, when the stable temperature is greater than the first threshold, such as... Figure 2 As shown, the first gate 21 is opened, and the side of the first gate 21 away from the second pipe 12 is connected to the second preset process through a conveying pipe. The filtered gas is then conveyed to the second preset process for heating through the conveying pipe. The specific process of heating the second preset process with the filtered gas can be arranged according to the specific appearance of the equipment in the second preset process, and the layout of the heat conduction channel is existing technology and will not be described in detail here. After heating the second preset process, the third gate 23 is opened to return the filtered gas to the third pipe 13. Conversely, when the temperature of the filtered gas is lower than the first threshold, that is, when the temperature of the filtered gas is lower than the temperature required by the second preset process, the first gate 21 and the third gate 23 are closed, and the second gate 22 is opened, so that the filtered gas directly enters the third pipe 13. Through the above technical solution, the heat of the filtered gas can be fully utilized to heat the second preset process, and the utilization rate of waste heat can be improved.

[0057] Further, step S3 includes:

[0058] Step S31: When the filtered gas passes through the third pipe 13, the filtered gas is subjected to secondary heat collection by the second heat collection unit 4. The second heat collection unit 4 is located in the middle of the third pipe 13 and has a ring pipe structure. The ring pipe structure contains second circulating water.

[0059] Step S32: After secondary heat collection of the second circulating water in the second heat collection unit 4, it enters the third preset process corresponding equipment 5. A water guide trough 24 is provided below the second heat collection unit 4 on the third pipe 13. When condensate is generated through the second heat collection unit 4, the condensate is discharged through the water guide trough 24. A water guide pipe is provided outside the water guide trough 24. The second heat collection unit 4 is directly connected to the water supply unit.

[0060] Specifically, since the filtered gas remains at a high temperature and carries a large amount of heat even after being heated in the second preset process, direct discharge would result in significant waste of heat. Therefore, when the filtered gas passes through the third pipe 13, it undergoes secondary heat collection through the second heat collection unit 4. The second heat collection unit 4 is located in the middle of the third pipe 13 and has a ring-shaped structure. This ring-shaped structure contains second circulating water. The inlet of the second heat collection unit 4 is connected to an external water supply unit, providing water flow power. Since the water entering the second heat collection unit 4 is water directly flowing from the water supply unit, the temperature of the second circulating water that has not undergone heat collection is low, while the temperature in the third preset process is high. Therefore, the second circulating water can effectively collect heat from the filtered gas. After the second circulating water fully absorbs the heat from the filtered gas and performs secondary heat absorption, the second circulating water enters through the inlet of the equipment 5 corresponding to the third preset process and flows out from the outlet of the equipment 5 corresponding to the third preset process. The third preset process is the ingot casting process in the waste aluminum processing production line. During the ingot casting process, water is used to cool the molten aluminum liquid to form solid aluminum, which generates a large amount of heat. Although the second circulating water is used for secondary heat collection, its temperature is far lower than that of the molten aluminum liquid. Therefore, in order to save water resources, the second circulating water is used for waste heat collection in the third preset process. Through the above technical solution, not only can the waste heat in the filtered gas be fully absorbed, but the second circulating water can also be used for waste heat collection in the third preset process, thus saving water resources.

[0061] Further, step S4 includes:

[0062] The first circulating water in the first heat collection unit 1 and the second circulating water that has passed through the device 5 corresponding to the third preset process are transported to the processing unit 6, and low-pressure steam is generated by the processing unit 6. The flowing water in the processing unit 6 is then returned to the first heat collection unit 1 as the first circulating water.

[0063] Specifically, by transporting the first circulating water carrying a large amount of heat and the second circulating water passing through the equipment 5 corresponding to the third preset process to the processing unit 6, and generating low-pressure steam through the processing unit 6, the low-pressure steam can be used for power generation, heating, cooking, or humidification, so that the waste heat can be fully reused. At the same time, the flowing water in the processing unit 6 that has not been converted into low-pressure steam is returned to the first circulating water and enters the first heat collection unit 1 to absorb heat again. Through the above technical solution, the waste heat generated in the waste aluminum processing production line can be fully utilized and the utilization rate of waste heat can be improved.

[0064] Furthermore, when the filtered gas passes through the second pipe 12, the concentration of the preset gas in the filtered gas is detected by the detection unit 3, and when the concentration of the preset gas is greater than or equal to the preset concentration, the suction force of the suction unit is reduced to reduce the flow rate of the high-temperature exhaust gas. The suction unit is located inside the first pipe 11 and before the first heat collection unit 1.

[0065] Specifically, when the filtered gas passes through the second pipe 12, the detection unit 3 detects the content of the preset gas in the filtered gas. When the concentration of the preset gas is greater than the preset concentration, because the heating temperature of the high-temperature exhaust gas is low or the flow rate of the high-temperature exhaust gas is high, the preset gas in the high-temperature exhaust gas cannot be fully absorbed when passing through the filter unit 2. Therefore, by changing the suction force of the extraction unit, the contact time between the high-temperature exhaust gas and the heat exchange tube in the first heat collection unit 1 is increased, and the flow rate of the high-temperature exhaust gas is reduced, thereby increasing the contact time between the high-temperature exhaust gas and the chemical substances in the filter unit 2, such as... Figure 2 As shown, the first heat collection unit 1 is a needle-fin heat exchange device. The heat exchange tube in the first heat collection unit 1 forms a 90-degree angle with the flow direction of the high-temperature waste gas, so that the contact area between the heat exchange tube and the high-temperature waste gas is maximized, and the high-temperature waste gas and the high-temperature waste gas are maximized. By adjusting the suction force of the extraction unit, the flow rate of the high-temperature waste gas is maximized under the premise that the preset gas concentration is less than the preset concentration. Through the above technical solution, not only is the absorption rate of the preset gas in the high-temperature waste gas improved, but also the discharge efficiency of the high-temperature waste gas is improved.

[0066] Furthermore, the processing unit 6 is a flash evaporation device.

[0067] This invention also provides a waste heat comprehensive utilization system for a waste aluminum processing production line, used to implement the above-mentioned method, such as... Figure 3 As shown, the system includes:

[0068] The first heat collection unit 1 is used to exchange heat with the high-temperature waste gas generated during the first preset process in the waste aluminum processing when it passes through the first pipe 11. The first heat collection unit 1 is provided inside the first pipe 11, and the first heat collection unit 1 and the water pipe of the processing unit 6 are interconnected.

[0069] Filter unit 2 is used to filter the high-temperature exhaust gas;

[0070] The detection unit 3 is used to periodically monitor the stable temperature of the filtered gas when it enters the second pipe 12, and determine whether to supply heat to the second preset process based on the stable temperature. After supplying heat to the second preset process, the filtered gas returns to the third pipe 13.

[0071] The second heat collection unit 4 is used for secondary heat collection of the filtered gas and to return the internal second circulating water to the third preset process for heat exchange.

[0072] Processing unit 6 is used to obtain low-pressure steam based on the first circulating water in the first heat collection unit 1 and the second circulating water that has passed through the device 5 corresponding to the third preset process.

[0073] The present invention also provides a computer-readable storage medium storing instructions that, when executed by a processor, implement the above-described method.

[0074] In summary, this invention, by setting up a first heat collection unit 1, utilizes a water circulation device to exchange heat with the large amount of high-temperature waste gas (over 700 degrees Celsius) generated in processes such as waste aluminum smelting, absorbing heat from the waste gas. When the waste gas temperature is lower than the set temperature or the temperature of the first circulating water, the first circulating water can also heat the waste gas, ensuring that the waste gas can fully react with chemical substances in the subsequent filtration unit 2, improving the removal effect of the preset gas, while avoiding condensation and preventing pipeline corrosion. Furthermore, when the filtered gas enters the second pipeline 12, its stable temperature is periodically detected by a detection unit 3, and the supply of heat to the second preset process is determined based on the temperature, and adjusted accordingly. The system controls the heating temperature by adjusting the gate opening, further improving the efficiency of waste heat utilization. Secondly, the system achieves multi-stage utilization of waste heat, reducing energy waste. After the filtered gas supplies heat to the second preset process, it also performs secondary heat collection through the second heat collection unit 4 in the third pipeline 13. The collected heat is used for heat exchange in the third preset process, helping to cool the molten aluminum liquid and form solid aluminum. This process not only fully absorbs the waste heat in the filtered gas but also saves water resources, because the second circulating water can be directly used in the third preset process after completing the secondary heat collection, without the need for additional cooling water. Finally, the system and method also have good economic and environmental benefits. By converting the collected heat into low-pressure steam, which can be used for various purposes such as power generation, heating, cooking, or humidification, waste heat is reused, reducing the energy costs of enterprises. At the same time, the processing unit 6 in the system can also return the flowing water that has not been converted into steam to the first heat collection unit 1 as the first circulating water, forming a closed loop, reducing water consumption and having good environmental benefits. Through the cooperation of the above technical solutions, and through multi-stage heat collection and recycling, efficient recovery and full utilization of waste heat are achieved, with significant energy-saving and consumption-reducing effects, which is of great significance for promoting energy conservation and environmental protection in industrial production.

[0075] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0076] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0077] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for comprehensive utilization of waste aluminum from a waste aluminum processing production line, characterized in that, The method includes: Step S1: During the waste aluminum processing, a large amount of high-temperature waste gas is generated during the smelting process, which is the first preset process. When the high-temperature waste gas passes through the first pipe (11), the high-temperature waste gas is heat-exchanged by the first heat collection unit (1) and the preset gas is filtered by the filter unit (2) to obtain filtered gas. The first heat collection unit (1) is set inside the first pipe (11), and the first heat collection unit (1) and the flash evaporation device (6) are interconnected by water pipes. The first heat collection unit (1) is located before the filter unit (2). The first heat collection unit (1) is a water circulation device. The filter unit (2) is a double-layer mesh structure. The double-layer mesh structure is provided with a chemical substance that can absorb the preset gas. The first circulating water in the first heat collection unit (1) absorbs the heat in the high-temperature waste gas and flows into the flash evaporation device (6). Step S2: When the filtered gas enters the second pipe (12), the stable temperature of the filtered gas is periodically monitored by the temperature monitoring unit. Based on the stable temperature, it is determined whether to supply heat to the second preset process. After supplying heat to the second preset process, the filtered gas returns to the third pipe (13). Step S3: The filtered gas is subjected to secondary heat collection through the second heat collection unit (4) in the third pipe (13), and the second circulating water in the second heat collection unit (4) is returned to the third preset process for heat exchange; wherein, a water guide trough (24) is provided below the second heat collection unit (4) in the third pipe (13), and when condensate is generated through the second heat collection unit (4), the condensate is discharged through the water guide trough (24), wherein a water guide pipe is provided outside the water guide trough (24), wherein the second heat collection unit (4) is directly connected to the water supply unit; Step S4: The first circulating water in the first heat collection unit (1) and the second circulating water after the third preset process are transported to the flash steaming device (6) to obtain low-pressure steam. The flowing water in the flash steaming device (6) is also returned to the first heat collection unit (1) as the first circulating water. The third preset process is the ingot casting process in the waste aluminum processing production line.

2. The method according to claim 1, characterized in that, Step S2 includes: Step S21: When the filtered gas enters the second pipe (12) through the first pipe (11), the stable temperature of the filtered gas is periodically detected by the detection unit (3), wherein the stable temperature is the temperature of the filtered gas detected when the temperature difference of the filtered gas is within a preset range for N consecutive detections. Step S22: When the stable temperature is greater than the first threshold, open the first gate (21) to supply heat to the second preset process through the filtered gas, and adjust the heating temperature of the second preset process by adjusting the closing width of the second gate (22), wherein the second pipeline (12) and the corresponding equipment of the second preset process are separated by the first gate (21); when the stable temperature is less than the first threshold, close the first gate (21) and open the second gate (22) so that the filtered gas directly enters the third pipeline (13); Step S23: After the filtered gas is used to heat the second preset process, it returns to the third pipeline (13) through the third gate (23).

3. The method according to claim 1, characterized in that, Step S3 includes: When the filtered gas passes through the third pipe (13), the filtered gas is subjected to secondary heat collection by the second heat collection unit (4). The second heat collection unit (4) is located in the middle of the third pipe (13) and is a ring pipe structure. The ring pipe structure contains the second circulating water.

4. The method according to claim 1, characterized in that, When the filtered gas passes through the second pipe (12), the concentration of the preset gas in the filtered gas is also detected by the detection unit (3). When the concentration of the preset gas is greater than or equal to the preset concentration, the suction force of the suction unit is reduced, and the flow rate of the high-temperature exhaust gas is reduced. The suction unit is located in the first pipe (11) and before the first heat collection unit (1).

5. A waste heat comprehensive utilization system for a waste aluminum processing production line, used to implement the method as described in any one of claims 1-4, characterized in that, The system includes: The first heat collection unit (1) is used to exchange heat with the high-temperature waste gas generated during the first preset process in the waste aluminum treatment process when it passes through the first pipe (11). The first heat collection unit (1) is provided inside the first pipe (11), and the first heat collection unit (1) and the flash evaporation device (6) are interconnected by water pipes. Filtering unit (2) is used to filter the high-temperature exhaust gas; The detection unit (3) is used to periodically monitor the stable temperature of the filtered gas when it enters the second pipe (12), and determine whether to supply heat to the second preset process based on the stable temperature. After supplying heat to the second preset process, the filtered gas returns to the third pipe (13). The second heat collection unit (4) is used to perform secondary heat collection on the filtered gas and return the internal second circulating water to the third preset process for heat exchange. Flash steam generator (6) is used to obtain low-pressure steam based on the first circulating water in the first heat collection unit (1) and the second circulating water that has passed through the device (5) corresponding to the third preset process.

6. A computer-readable storage medium storing instructions thereon, characterized in that, When the instructions are executed by the processor, they implement the method as described in any one of claims 1-4.

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