A condensing recovery device for diaphragm production line tail gas DMSO

Abstract

The utility model belongs to the battery diaphragm production line technical field, concretely relates to a kind of condensing recovery device for diaphragm production line tail gas DMSO, including control system and the frequency conversion fan mechanism, gas-liquid separation condensing heat exchanger, activated carbon adsorption device and valve assembly connected with control system;The device realizes the efficient condensation recovery and ultra-low emission of DMSO in tail gas by the synergistic effect between control system, frequency conversion fan mechanism, gas-liquid separation condensing heat exchanger, activated carbon adsorption device and valve assembly, not only effectively reduces resource waste, but also significantly reduces the harm of harmful substances in tail gas to environment and operating personnel, provides powerful guarantee for the green, sustainable development of battery diaphragm production.

Description

Technical Field

[0001] This utility model belongs to the field of battery separator production line technology, specifically relating to a condensation and recovery device for DMSO exhaust gas from separator production lines. Background Technology

[0002] Lithium-sulfur batteries, as an important type of lithium battery, have attracted much attention due to their extremely high theoretical energy density (reaching 2600Wh / kg), a figure far exceeding that of mainstream lithium-ion batteries currently on the market, such as lithium iron phosphate batteries (approximately 200Wh / kg) and ternary lithium batteries (200~300Wh / kg). Therefore, lithium-sulfur batteries demonstrate enormous application potential and market prospects in fields such as electric vehicles, portable electronic devices, and energy storage systems.

[0003] The production process of battery electrode materials is complex and delicate, with the production of the separator being a key step. The separator production process mainly includes steps such as slurry preparation, coating, baking, cutting, and winding. During the baking stage after coating, due to the use of electric heating, dimethyl sulfoxide (DMSO, molecular formula C2H6OS) in the slurry completely volatilizes and is discharged with the exhaust gas. DMSO, as a sulfur-containing organic compound, is a colorless, odorless, and transparent liquid at room temperature, but it is hygroscopic and flammable, and has certain local toxicity and low systemic toxicity to operators; long-term exposure may have adverse health effects.

[0004] Currently, although there are some condensation recovery technologies for industrial waste gas treatment, there are few condensation recovery systems specifically for DMSO in the exhaust gas of battery separator production lines. Moreover, existing condensation recovery technologies may have problems such as complex equipment, inconvenient operation, and low recovery efficiency, making it difficult to meet the high-efficiency, flexible, and environmentally friendly requirements of battery separator production lines for exhaust gas treatment. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, this utility model provides a condensation and recovery device for DMSO in the exhaust gas of a diaphragm production line. This device solves the problems of low DMSO recovery rate and substandard exhaust gas emissions in existing battery diaphragm production line exhaust gas treatment technologies, which pose threats to the environment and the health of operators.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A condensation and recovery device for DMSO exhaust gas from a diaphragm production line is provided, comprising:

[0008] The variable frequency fan mechanism is connected to the coating and drying integrated machine. The variable frequency fan mechanism includes a heating section fan assembly and a cooling section fan assembly.

[0009] A gas-liquid separation and condensation heat exchanger, the input end of which is connected to the output end of the heating section fan assembly via a first pipe;

[0010] The activated carbon adsorption device has its input end connected to the output end of the cooling section fan assembly via a second pipe. The input end of the activated carbon adsorption device is also connected to the gas output end of the gas-liquid separation condensation heat exchanger. The output end of the activated carbon adsorption device is connected to the tail gas variable frequency venting fan, which is then connected to the atmospheric emission pipeline.

[0011] Valve assembly, the valve assembly is installed on the first pipe and the second pipe.

[0012] The beneficial effects of adopting the above technical solution are as follows: The variable frequency fan mechanism in this device is connected to the coating and drying integrated machine, and is equipped with a heating section fan assembly and a cooling section fan assembly. The heating section fan assembly sends the exhaust gas containing a large amount of DMSO into the gas-liquid separation condenser heat exchanger, and the cooling section fan sends the exhaust gas with a lower processing temperature into the activated carbon adsorption device. The gas-liquid separation condenser heat exchanger is connected to the output end of the heating section fan assembly through a first pipe. The exhaust gas exchanges heat with the condensate in the gas-liquid separation condenser heat exchanger, causing the DMSO to condense into droplets, achieving gas-liquid separation and improving the DMSO recovery efficiency. The activated carbon adsorption device is connected to the output end of the cooling section fan assembly through a second pipe and is also connected to the gas output end of the gas-liquid separation heat exchanger. The activated carbon adsorption device can further absorb the exhaust gas. The remaining DMSO in the process enables the exhaust gas to meet ultra-low emission standards. By mixing with the condensed and recovered exhaust gas, the activated carbon adsorption device reduces the temperature of the mixed exhaust gas while also recovering the cooling energy of the exhaust gas, improving energy utilization efficiency and exhaust gas treatment effect. This achieves energy recycling and reduces operating costs. In addition, the valve assemblies installed on the first and second pipelines can precisely control the exhaust gas output flow rate by adjusting the valve opening, thereby optimizing the exhaust gas treatment process. Under low load conditions, some exhaust gas can be directly sent to the activated carbon adsorption device by adjusting the valve assemblies, which can meet the exhaust gas treatment requirements, reduce condensate consumption, achieve energy saving, and improve the flexibility and adaptability of the device, enabling it to cope with the exhaust gas treatment needs under different production conditions.

[0013] This device achieves efficient condensation and recovery of DMSO in exhaust gas and ultra-low emissions through the synergistic effect of the control system, variable frequency fan mechanism, gas-liquid separation condenser heat exchanger, activated carbon adsorption device and valve assembly. It not only effectively reduces resource waste, but also significantly reduces the harm of harmful substances in exhaust gas to the environment and operators, providing a strong guarantee for the green and sustainable development of battery separator production.

[0014] Furthermore, the heating section fan assembly includes at least a first variable frequency fan, a second variable frequency fan, and a third variable frequency fan connected to the heating section of the coating and drying integrated machine. The output ends of the first variable frequency fan, the second variable frequency fan, and the third variable frequency fan are all connected to the first pipe through pipes, and the third variable frequency fan is connected to the second pipe through pipes.

[0015] The cooling section fan assembly includes at least a fourth variable frequency fan, a fifth variable frequency fan, and a sixth variable frequency fan connected to the cooling section of the coating and drying integrated machine. The fourth, fifth, and sixth variable frequency fans are all connected to the second pipeline through pipes.

[0016] The beneficial effects of adopting the above technical solution are as follows: The first and second variable frequency fans are directly connected to the heating section of the coating and drying integrated machine, which can draw in the high-concentration DMSO exhaust gas from the heating section and send it to the gas-liquid separation condenser heat exchanger through the first pipeline, ensuring that the high-concentration DMSO is preferentially recovered and avoiding resource waste. The third variable frequency fan can treat the exhaust gas from the heating section through the first pipeline, and can also directly introduce the exhaust gas into the activated carbon adsorption device through the second pipeline when the load is low, thereby reducing the amount of condensate used and achieving energy saving and consumption reduction. The fourth, fifth, and sixth variable frequency fans are connected to the cooling section of the coating and drying integrated machine, and can send the low-temperature exhaust gas from the cooling section into the activated carbon adsorption device through the second pipeline. The DMSO content in the exhaust gas of the cooling section is low and does not require condensation treatment. It can be directly adsorbed by the activated carbon adsorption device, which can ensure that the exhaust gas emission meets the standards and reduce the overall energy consumption of the entire device.

[0017] Furthermore, the gas-liquid separation condenser heat exchanger is a vertical shell-and-tube heat exchanger. A tail gas inlet is located at the top of the condensing section, and this inlet is connected to the first pipe. A condensate outlet is located on one side of the top of the condensing section, and a condensate inlet is located on one side of the lower end of the condensing section. A gas-liquid separation section is located below the condensing section, and a wire mesh demister is installed within this section. A gas outlet is located on one side of the lower end of the gas-liquid separation section, and a condensate outlet is located at the bottom of the section. The condensate outlet is connected to a U-shaped liquid seal, which in turn is connected to a condensate collector.

[0018] The beneficial effects of adopting the above technical solution are as follows: The vertical tube-and-shell heat exchanger for gas-liquid separation reduces the floor space required and lowers the overall layout complexity of the device. The tail gas inlet, located at the top of the condensation section of the gas-liquid separation condensation heat exchanger, is connected to the output of the heating section fan assembly via a first pipe. This ensures that high-concentration DMSO tail gas enters the gas-liquid separation condensation heat exchanger, allowing DMSO to immediately contact the condensate upon entry, thus effectively improving condensation efficiency. The condensate enters from the lower side of the condensation section, forming a counter-current flow with the tail gas flowing in from the top, extending the heat exchange time. Furthermore, the condensate outlet at the top of the condensation section promptly discharges the heated condensate, maintaining a constant low-temperature environment inside the gas-liquid separation condensation heat exchanger. This ensures that DMSO condenses at the optimal temperature, thus avoiding the problem of decreased recovery efficiency due to temperature fluctuations. The gas-liquid separation section is located below the condensation section, and its built-in wire mesh demister further intercepts tiny droplets, preventing them from being carried by the tail gas to the gas outlet, thereby improving gas-liquid separation efficiency and ensuring extremely low DMSO content in the exhaust gas. The gas outlet located at the lower end of the gas-liquid separation section can transport the separated clean exhaust gas to the activated carbon adsorption device. The condensate outlet located at the bottom of the gas-liquid separation section is connected to the condensate collector through a U-shaped liquid seal. The U-shaped liquid seal uses the water seal principle to prevent the exhaust gas from flowing back into the condensate pipeline, which not only ensures the safety of operators but also avoids condensate pollution. The condensate collector can periodically discharge or recover DMSO solution to achieve resource recycling.

[0019] Furthermore, the valve assembly includes a first flow regulating valve and a second flow regulating valve. The first flow regulating valve is installed on the pipe connecting the third variable frequency fan and the first pipe, and the second flow regulating valve is installed on the pipe connecting the third variable frequency fan and the second pipe.

[0020] The beneficial effects of adopting the above technical solution are as follows: The first flow regulating valve controls the flow rate of the exhaust gas from the outlet of the third variable frequency fan into the first pipeline, thereby achieving precise adjustment of the exhaust gas treatment volume in the heating section. Under normal production load, the first flow regulating valve remains open, ensuring that all the exhaust gas (including high-concentration DMSO) drawn by the third variable frequency fan enters the gas-liquid separation condenser heat exchanger for recovery, avoiding resource waste. When the system needs to reduce the condensation load (such as during low load or maintenance), the amount of exhaust gas entering the gas-liquid separation condenser heat exchanger can be reduced by decreasing the opening of the first flow regulating valve, thereby reducing condensate consumption and equipment energy consumption. The dynamic adjustment of the first flow regulating valve allows the device to flexibly match production needs, improving resource utilization efficiency. The second flow regulating valve optimizes the exhaust gas treatment path of the cooling section by controlling the flow rate of the exhaust gas from the outlet of the third variable frequency fan into the second pipeline. When the load is low or the gas-liquid separation condenser heat exchanger is saturated, the second flow regulating valve can be opened to guide some of the exhaust gas directly into the activated carbon adsorption device, bypassing the condensation stage of the gas-liquid separation condenser heat exchanger, thereby reducing ineffective condensation energy consumption. Through the linkage control of the first and second flow regulating valves, the exhaust gas flow direction of the device is intelligently selected. By monitoring the production load, exhaust gas concentration and device status in real time, the control system automatically adjusts the opening ratio of the first and second flow regulating valves, which significantly improves the overall automation level and operational reliability of the device, and is conducive to the green and efficient production of battery separators.

[0021] Furthermore, the condensate outlet is connected to the chiller via a fourth pipe, and the condensate inlet is connected to the chiller via a fifth pipe, on which a temperature regulating valve is installed.

[0022] The beneficial effects of adopting the above technical solution are as follows: the condensate inlet introduces the low-temperature condensate output from the chiller into the heat exchanger through the fifth pipe, forming a counter-current heat exchange with the exhaust gas. The condensate outlet, through the fourth pipe, transports the heated condensate from the heat exchanger back to the chiller for refrigeration circulation, forming a closed-loop circuit for the condensate. This avoids energy waste caused by the direct discharge of high-temperature condensate, while ensuring that the chiller can continuously provide low-temperature cooling medium. The temperature regulating valve can automatically adjust the condensate flow rate in the fifth pipe by monitoring the condensate temperature in the heat exchanger or the exhaust gas outlet temperature in real time. When the exhaust gas load increases, causing the condensation temperature to rise, the chiller opening is increased to increase the supply of low-temperature condensate; conversely, the opening is reduced to save energy. This allows the unit to adapt to the exhaust gas treatment needs at different production rates, avoiding incomplete DMSO condensation or overload of the activated carbon adsorption unit due to temperature fluctuations.

[0023] Furthermore, the gas outlet is connected to the input end of the activated carbon adsorption device through a third pipeline, on which a temperature transmitter is installed, and the temperature transmitter is interlocked with the temperature regulating valve.

[0024] The beneficial effects of adopting the above technical solution are as follows: the clean tail gas after gas-liquid separation is directly transported to the activated carbon adsorption device through a third pipeline, forming a two-stage treatment process of condensation recovery and adsorption purification. The temperature transmitter monitors the tail gas temperature entering the activated carbon adsorption device in real time and transmits the data to the control system. The temperature transmitter is interlocked with the temperature regulating valve, and the temperature regulating valve can be automatically adjusted through the feedback signal of the temperature transmitter to form a closed-loop temperature control system. When the tail gas temperature approaches the upper limit of activated carbon adsorption, the temperature regulating valve is automatically opened to enhance the condensation effect and reduce the tail gas temperature. When the temperature returns to normal, it returns to its original position to save energy, avoid the lag of manual intervention, prevent activated carbon deactivation or decreased adsorption efficiency due to excessive temperature, and reduce energy waste caused by excessive cooling.

[0025] In summary, the condensation and recovery device for DMSO exhaust gas from a diaphragm production line provided by this utility model has the following beneficial effects:

[0026] (1) This device achieves efficient DMSO recovery through a two-stage condensation process: primary condensation and deep condensation. The primary condensation uses a gas-liquid separation condenser heat exchanger, which exchanges heat with the tail gas in a countercurrent manner, causing high-concentration DMSO to condense and liquefy at low temperatures, thus initially reducing the DMSO concentration in the tail gas. The deep condensation uses an activated carbon adsorption device to further capture residual DMSO, ensuring that the DMSO content in the tail gas is reduced to the emission standard. At the same time, the two-stage condensation extends the tail gas residence time, and combined with the wire mesh demister at the bottom of the gas-liquid separation condenser heat exchanger, it effectively intercepts condensate droplets, greatly improving the DMSO recovery rate. In addition, the low-temperature tail gas condensed by the gas-liquid separation condenser heat exchanger is mixed with the tail gas from the cooling section of the coating and drying integrated machine and then transported to the activated carbon adsorption device, reducing the activated carbon adsorption load and realizing resource recycling.

[0027] (2) The device uses a temperature transmitter, temperature regulating valve, and variable frequency fan mechanism for interlocking control. The temperature transmitter can monitor the outlet exhaust gas temperature of the gas-liquid separation condenser heat exchanger in real time. When the temperature approaches the upper limit of activated carbon adsorption, the condensate regulating valve is automatically opened to enhance the cooling effect. At the same time, the speed of the variable frequency fan mechanism is adjusted to reduce the exhaust gas flow rate and extend the condensation time. Dynamic control avoids activated carbon failure or secondary volatilization of DMSO caused by high-temperature exhaust gas, ensuring that the DMSO concentration in the exhaust gas is consistently lower than the national emission standard. Furthermore, the interlocking control reduces the lag of manual intervention, improving the reliability of operation and environmental compliance.

[0028] (3) The device achieves selective condensation of exhaust gas through the variable frequency fan mechanism and valve assembly. The high-concentration DMSO exhaust gas discharged from the main heating section of the coating machine is preferentially sent to the gas-liquid separation heat exchanger for condensation and recovery, while the low-concentration exhaust gas in the cooling section directly enters the activated carbon adsorption device, avoiding energy waste caused by inefficient condensation. At the same time, under low load conditions, the device can switch the exhaust gas of the third variable frequency fan to the activated carbon adsorption path through the valve assembly, further reducing the consumption of condensate. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] The components include: 1. Variable frequency fan mechanism; 2. Coating and drying integrated machine; 3. Gas-liquid separation condenser heat exchanger; 4. Activated carbon adsorption device; 5. Second pipeline; 6. Exhaust gas variable frequency venting fan; 7. First pipeline; 8. First variable frequency fan; 9. Second variable frequency fan; 10. Third variable frequency fan; 11. Fourth variable frequency fan; 12. Fifth variable frequency fan; 13. Sixth variable frequency fan; 14. Exhaust gas inlet; 15. Condensate outlet; 16. Condensate inlet; 17. Wire mesh demister; 18. Gas outlet; 19. Condensate discharge outlet; 20. U-shaped liquid seal; 21. First flow regulating valve; 22. Second flow regulating valve; 23. Fourth pipeline; 24. Fifth pipeline; 25. Temperature regulating valve; 26. Third pipeline; 27. Temperature transmitter. Detailed Implementation

[0031] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0032] like Figure 1As shown, this utility model provides a condensation and recovery device for DMSO exhaust gas from a diaphragm production line, including a control system and a variable frequency fan mechanism 1, a gas-liquid separation condenser heat exchanger 3, an activated carbon adsorption device 4, and a valve assembly connected to the control system; wherein the variable frequency fan mechanism 1 is connected to the coating and drying integrated machine 2, the variable frequency fan mechanism 1 includes a heating section fan assembly and a cooling section fan assembly, the output end of the heating section fan assembly is connected to the input end of the gas-liquid separation condenser heat exchanger 3 through a first pipe 7, the gas output end of the gas-liquid separation condenser heat exchanger 3 is connected to the input end of the activated carbon adsorption device 4, and the input end of the activated carbon adsorption device 4 is connected to the output end of the cooling section fan assembly through a second pipe 5, the output end of the activated carbon adsorption device 4 is connected to the exhaust gas variable frequency venting fan 6, the exhaust gas variable frequency venting fan 6 is connected to the atmospheric emission pipeline, and the valve assembly is installed on the first pipe 7 and the second pipe 5.

[0033] The variable frequency fan mechanism 1 in this device is connected to the coating and drying integrated machine 2, and is equipped with a heating section fan assembly and a cooling section fan assembly. The heating section fan assembly sends the exhaust gas containing a large amount of DMSO into the gas-liquid separation condenser heat exchanger 3, while the cooling section fan sends the exhaust gas with a lower processing temperature into the activated carbon adsorption device 4. The gas-liquid separation condenser heat exchanger 3 is connected to the output end of the heating section fan assembly via a first pipe 7. The exhaust gas exchanges heat with the condensate in the gas-liquid separation condenser heat exchanger 3, causing the DMSO to condense into droplets, achieving gas-liquid separation and improving the DMSO recovery efficiency. The activated carbon adsorption device 4 is connected to the output end of the cooling section fan assembly via a second pipe 5, and is also connected to the gas output end of the gas-liquid separation heat exchanger. The activated carbon adsorption device 4 can further absorb the remaining DMSO in the exhaust gas. MSO enables the exhaust gas to meet ultra-low emission standards. By mixing with the condensed and recovered exhaust gas, the activated carbon adsorption device 4 reduces the temperature of the mixed exhaust gas while also recovering the cooling energy of the cooled exhaust gas, improving energy utilization efficiency and exhaust gas treatment effect, realizing energy recycling and reducing operating costs. In addition, the valve assembly installed on the first pipe 7 and the second pipe 5 can precisely control the exhaust gas output flow rate by adjusting the valve opening, thereby optimizing the exhaust gas treatment process. Under low load conditions, some exhaust gas can be directly sent to the activated carbon adsorption device 4 by adjusting the valve assembly, which can meet the exhaust gas treatment requirements, reduce the amount of condensate used, achieve energy saving, and improve the flexibility and adaptability of the device, enabling the device to cope with the exhaust gas treatment requirements under different production conditions.

[0034] like Figure 1As shown, the heating section fan assembly includes at least a first variable frequency fan 8, a second variable frequency fan 9, and a third variable frequency fan 10 connected to the heating section of the coating and drying integrated machine 2. The output ends of the first variable frequency fan 8, the second variable frequency fan 9, and the third variable frequency fan 10 are all connected to the first pipe 7 through pipes, and the third variable frequency fan 10 is connected to the second pipe 5 through pipes. The cooling section fan assembly includes at least a fourth variable frequency fan 11, a fifth variable frequency fan 12, and a sixth variable frequency fan 13 connected to the cooling section of the coating and drying integrated machine 2. The fourth variable frequency fan 11, the fifth variable frequency fan 12, and the sixth variable frequency fan 13 are all connected to the second pipe 5 through pipes. The first variable frequency fan 8 and the second variable frequency fan 9 are directly connected to the heating section of the coating and drying integrated machine 2. They can draw in the high-concentration DMSO exhaust gas from the heating section and collect it through the first pipe 7 before sending it to the gas-liquid separation condenser heat exchanger 3. This ensures that the high-concentration DMSO is preferentially recovered, avoiding resource waste. The third variable frequency fan 10 can treat the exhaust gas from the heating section through the first pipe 7, and can also directly introduce the exhaust gas into the activated carbon adsorption device 4 through the second pipe 5 when the load is low, thereby reducing the amount of condensate used and achieving energy saving and consumption reduction. The fourth variable frequency fan 11, the fifth variable frequency fan 12, and the sixth variable frequency fan 13 are connected to the cooling section of the coating and drying integrated machine 2. They can send the low-temperature exhaust gas from the cooling section into the activated carbon adsorption device 4 through the second pipe 5. The DMSO content in the exhaust gas from the cooling section is low and does not require condensation treatment. It can be directly adsorbed by the activated carbon adsorption device 4, which can ensure that the exhaust gas emission meets the standards and reduce the overall energy consumption of the entire device.

[0035] like Figure 1As shown, the gas-liquid separation condenser heat exchanger 3 is a vertical shell-and-tube heat exchanger. A tail gas inlet 14 is located at the top of the condensing section of the gas-liquid separation condenser heat exchanger 3, and the tail gas inlet 14 is connected to the first pipe 7. A condensate outlet 15 is located on one side of the top of the condensing section of the gas-liquid separation condenser heat exchanger 3, and a condensate inlet 16 is located on one side of the lower end of the condensing section of the gas-liquid separation condenser heat exchanger 3. A gas-liquid separation section is located below the condensing section of the gas-liquid separation heat exchanger 3, and a wire mesh demister 17 is installed in the gas-liquid separation section. A gas outlet 18 is located on one side of the lower end of the gas-liquid separation section, and a condensate outlet 19 is located at the bottom of the gas-liquid separation section. The condensate outlet 19 is connected to a U-shaped liquid seal 20, and the U-shaped liquid seal 20 is connected to a condensate collector. The vertical shell-and-tube heat exchanger design of the gas-liquid separation condenser heat exchanger 3 reduces the floor space required and lowers the complexity of the overall layout of the device. The tail gas inlet 14, located at the top of the condensing section of the gas-liquid separation condenser heat exchanger 3, is connected to the output end of the heating section fan assembly via the first pipe 7. This ensures that high-concentration DMSO tail gas enters the gas-liquid separation condenser heat exchanger 3, allowing DMSO to immediately contact the condensate upon entering, thus effectively improving condensation efficiency. The condensate enters from the lower side of the condensing section, forming a counter-flow with the tail gas flowing in from the top, extending the heat exchange time. Furthermore, the condensate outlet 15 at the top of the condensing section can promptly discharge the heated condensate, maintaining a constant low-temperature environment inside the gas-liquid separation condenser heat exchanger 3. This ensures that DMSO condenses at the optimal temperature (7°C), thus avoiding the problem of decreased recovery efficiency due to temperature fluctuations. The gas-liquid separation section is located below the condensing section, and its built-in wire mesh demister 17 further intercepts tiny droplets, preventing them from being carried by the tail gas to the gas outlet 18, thereby improving gas-liquid separation efficiency and ensuring extremely low DMSO content in the exhaust gas. The gas outlet 18, located at the lower end of the gas-liquid separation section, can transport the separated clean tail gas to the activated carbon adsorption device 4. The condensate outlet 19, located at the bottom of the gas-liquid separation section, is connected to the condensate collector via a U-shaped liquid seal 20. The U-shaped liquid seal 20 uses the water seal principle to prevent the tail gas from flowing back into the condensate pipeline, which not only ensures the safety of the operators but also avoids condensate pollution. The condensate collector can periodically discharge or recover DMSO solution to achieve resource recycling.

[0036] like Figure 1As shown, the valve assembly includes a first flow regulating valve 21 and a second flow regulating valve 22. The first flow regulating valve 21 is installed on the pipe connecting the third variable frequency fan 10 and the first pipe 7, and the second flow regulating valve 22 is installed on the pipe connecting the third variable frequency fan 10 and the second pipe 5. The first flow regulating valve 21 controls the flow rate of the exhaust gas from the outlet of the third variable frequency fan 10 into the first pipe 7, thereby achieving precise adjustment of the exhaust gas treatment volume of the heating section. Under normal production load, the first flow regulating valve 21 remains open, ensuring that all the exhaust gas (including high-concentration DMSO) drawn by the third variable frequency fan 10 enters the gas-liquid separation condenser heat exchanger 3 for recovery, avoiding resource waste. When the system needs to reduce the condensation load (such as during low load or maintenance), the opening of the first flow regulating valve 21 can be reduced to decrease the amount of exhaust gas entering the gas-liquid separation condenser heat exchanger 3, thereby reducing condensate consumption and equipment energy consumption. The dynamic adjustment of the first flow regulating valve 21 allows the device to flexibly match production needs and improve resource utilization efficiency. The second flow regulating valve 22 optimizes the exhaust gas treatment path of the cooling section by controlling the flow rate of the exhaust gas from the outlet of the third variable frequency fan 10 into the second pipeline 5. When the processing capacity of the gas-liquid separation condenser heat exchanger 3 is saturated at low load, some exhaust gas can be guided directly into the activated carbon adsorption device 4 by opening the second flow regulating valve 22, bypassing the condensation stage of the gas-liquid separation condenser heat exchanger 3, thereby reducing ineffective condensation energy consumption. Through the linkage control of the first flow regulating valve 21 and the second flow regulating valve 22, the intelligent selection of the exhaust gas flow direction of the device is formed. By real-time monitoring of production load, exhaust gas concentration and device status, the control system automatically adjusts the opening ratio of the first flow regulating valve 21 and the second flow regulating valve 22, which significantly improves the overall automation level and operational reliability of the device, and is conducive to the green and efficient production of battery separators.

[0037] like Figure 1As shown, condensate outlet 15 is connected to the chiller via the fourth pipe 23, and condensate inlet 16 is connected to the chiller via the fifth pipe 24. A temperature regulating valve 25 is installed on the fifth pipe 24. Condensate inlet 16 introduces the low-temperature condensate output from the chiller into the heat exchanger via the fifth pipe 24, forming a counter-current heat exchange with the exhaust gas. Condensate outlet 15, via the fourth pipe 23, returns the heated condensate from the heat exchanger to the chiller for refrigeration circulation, forming a closed-loop condensate circuit. This avoids energy waste caused by direct discharge of high-temperature condensate and ensures the chiller can continuously provide low-temperature cooling medium. The temperature regulating valve 25 automatically adjusts the condensate flow rate of the fifth pipe 24 by real-time monitoring of the condensate temperature in the heat exchanger or the exhaust gas outlet temperature. When the exhaust gas load increases, causing the condensation temperature to rise, the chiller opening increases to increase the supply of low-temperature condensate; conversely, it decreases the opening to save energy. This allows the unit to adapt to the exhaust gas treatment needs at different production rates, preventing incomplete DMSO condensation or overload of the activated carbon adsorption unit 4 due to temperature fluctuations.

[0038] like Figure 1 As shown, gas outlet 18 is connected to the input end of activated carbon adsorption device 4 via a third pipe 26. A temperature transmitter 27 is installed on the third pipe 26. The temperature transmitter 27 is interlocked with the temperature regulating valve 25. Gas outlet 18 directly delivers the clean tail gas after gas-liquid separation to activated carbon adsorption device 4 through the third pipe 26, forming a two-stage treatment process of condensation recovery and adsorption purification. The temperature transmitter 27 monitors the tail gas temperature entering activated carbon adsorption device 4 in real time and transmits the data to the control system. The temperature transmitter 27 is interlocked with the temperature regulating valve 25, and the temperature regulating valve 25 can be automatically adjusted through the feedback signal from the temperature transmitter 27, forming a closed-loop temperature control system. When the tail gas temperature approaches the upper limit of activated carbon adsorption, the temperature regulating valve 25 is automatically opened to enhance the condensation effect and reduce the tail gas temperature. When the temperature returns to normal, it returns to its original position to save energy, avoid the lag of manual intervention, prevent activated carbon deactivation or decreased adsorption efficiency due to excessive temperature, and reduce energy waste caused by excessive cooling.

[0039] In summary, the condensation and recovery device for DMSO in the tail gas of a diaphragm production line provided by this utility model achieves efficient DMSO recovery through two-stage condensation: primary condensation and deep condensation. Primary condensation utilizes a gas-liquid separation condenser heat exchanger 3, where counter-current heat exchange between the condensate and the tail gas causes most of the DMSO to condense and liquefy at low temperatures, initially reducing the DMSO concentration in the tail gas. Deep condensation employs an activated carbon adsorption device 4, further capturing residual DMSO and ensuring that the DMSO content in the tail gas is reduced to emission standards. Simultaneously, the two-stage condensation extends the tail gas residence time, and combined with the wire mesh demister 17 within the gas-liquid separation condenser heat exchanger 3, effectively intercepts condensate droplets, significantly improving the DMSO recovery rate. Furthermore, the low-temperature tail gas condensed by the gas-liquid separation condenser heat exchanger 3 is mixed with the tail gas from the cooling section of the coating and drying integrated machine 2 before being transported to the activated carbon adsorption device 4, reducing the activated carbon adsorption load and achieving resource recycling.

Claims

1. A condensation and recovery device for DMSO tail gas from a diaphragm production line, characterized in that, include: A variable frequency fan mechanism (1) is connected to a coating and drying integrated machine (2). The variable frequency fan mechanism (1) includes a heating section fan assembly and a cooling section fan assembly. A gas-liquid separation condenser heat exchanger (3) is provided, the input end of which is connected to the output end of the heating section fan assembly via a first pipe (7). The activated carbon adsorption device (4) has its input end connected to the output end of the cooling section fan assembly via a second pipe (5), and its input end connected to the gas output end of the gas-liquid separation condenser heat exchanger (3). The output end of the activated carbon adsorption device (4) is connected to the tail gas variable frequency venting fan (6), and the tail gas variable frequency venting fan (6) is connected to the atmospheric emission pipeline. A valve assembly is disposed on the first pipe (7) and the second pipe (5).

2. The condensation and recovery device for DMSO tail gas from a diaphragm production line according to claim 1, characterized in that: The heating section fan assembly includes at least a first variable frequency fan (8), a second variable frequency fan (9), and a third variable frequency fan (10) connected to the heating section of the coating and drying integrated machine (2). The output ends of the first variable frequency fan (8), the second variable frequency fan (9), and the third variable frequency fan (10) are all connected to the first pipe (7) through pipes, and the third variable frequency fan (10) is connected to the second pipe (5) through pipes. The cooling section fan assembly includes at least a fourth variable frequency fan (11), a fifth variable frequency fan (12) and a sixth variable frequency fan (13) connected to the cooling section of the coating and drying integrated machine (2). The fourth variable frequency fan (11), the fifth variable frequency fan (12) and the sixth variable frequency fan (13) are all connected to the second pipe (5) through pipes.

3. The condensation and recovery device for DMSO tail gas from a diaphragm production line according to claim 1, characterized in that: The gas-liquid separation condenser heat exchanger (3) is a vertical tube heat exchanger. The top of the condensing section of the gas-liquid separation condenser heat exchanger (3) is provided with a tail gas inlet (14), which is connected to the first pipe (7). A condensate outlet (15) is provided on one side of the top of the condensing section of the gas-liquid separation condenser heat exchanger (3). A condensate inlet (16) is provided on one side of the lower end of the condensing section of the gas-liquid separation condenser heat exchanger (3). A gas-liquid separation section is provided below the condensing section of the gas-liquid separation condenser heat exchanger (3). A wire mesh demister (17) is provided in the gas-liquid separation section. A gas outlet (18) is provided on one side of the lower end of the gas-liquid separation section. A condensate outlet (19) is provided at the bottom of the gas-liquid separation section. The condensate outlet (19) is connected to a U-shaped liquid seal (20), which is connected to a condensate collector.

4. The condensation and recovery device for DMSO tail gas from a diaphragm production line according to claim 1, characterized in that: The valve assembly includes a first flow regulating valve (21) and a second flow regulating valve (22). The first flow regulating valve (21) is installed on the pipe connecting the third variable frequency fan (10) and the first pipe (7), and the second flow regulating valve (22) is installed on the pipe connecting the third variable frequency fan (10) and the second pipe (5).

5. The condensation and recovery device for DMSO tail gas from a diaphragm production line according to claim 3, characterized in that: The condensate outlet (15) is connected to the chiller via the fourth pipe (23), and the condensate inlet (16) is connected to the chiller via the fifth pipe (24). A temperature regulating valve (25) is installed on the fifth pipe (24).

6. The condensation and recovery device for DMSO tail gas from a diaphragm production line according to claim 3, characterized in that: The gas outlet (18) is connected to the input end of the activated carbon adsorption device (4) through a third pipe (26). A temperature transmitter (27) is installed on the third pipe (26), and the temperature transmitter (27) is interlocked with the temperature regulating valve (25).

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