Lithium ion diaphragm oil system coating waste gas multi-stage treatment device

Abstract

The utility model provides a lithium ion diaphragm oil system coating waste gas multi-stage treatment device which is used for treating high-temperature NMP waste gas and comprises a waste gas buffer chamber, a filter chamber, an atomizing chamber, an initial condensing chamber, a final condensing chamber, a tail gas chamber and a liquid collecting chamber, the filtering chamber is used for filtering the high-temperature NMP waste gas to form NMP filtered gas; the atomizing chamber, the initial condensation chamber and the final condensation chamber are used for carrying out heat exchange with NMP filtered gas so that the NMP filtered gas can be condensed into NMP liquid, the tail gas chamber is used for collecting uncondensed NMP filtered gas, an inlet of the liquid collecting chamber is connected to the atomizing chamber, the initial condensation chamber, the final condensation chamber and the tail gas chamber, and the liquid collecting chamber is used for collecting the NMP liquid. The multi-stage waste gas treatment device disclosed by the utility model can realize multi-stage treatment and multi-time treatment of waste gas, integrates the functions of a plurality of devices in a traditional mode into an integrated device, and has relatively strong self-control property and integration property.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment equipment, and more specifically, to a multi-stage waste gas treatment device with lithium-ion membrane oil coating. Background Technology

[0002] The coating process for lithium-ion battery separators is divided into two main categories: aqueous and oil-based. Aqueous coating is a more traditional technology, and its production process generates gaseous byproducts that are not harmful to the environment, in addition to the liquid slurry. Oil-based coating technology tends to use lipophilic compounds such as acetone and NMP as slurry solvents. Currently, N-methylpyrrolidone is widely used as a solvent in the industry. For the waste gas generated, existing equipment and processes mostly use cooling water and chilled water for secondary condensation treatment to separate the NMP waste gas into gaseous and liquid hazardous chemicals, which are then washed with water and distilled for reuse. Some equipment also uses RTO technology to treat the exhaust gas. If the gaseous byproducts of oil-based coating are not properly treated, they will not only harm the environment, but may also cause irreversible injuries to personnel. Therefore, the treatment of exhaust gas from oil-based coating in the lithium-ion battery separator industry is extremely important, as it relates to the environment, corporate economic benefits, and human health. For the process of oil-based coating, which widely uses N-methylpyrrolidone as a solvent, it is even more valuable and meaningful to carry out intensive, efficient, and integrated treatment of the exhaust gas generated.

[0003] Currently, industry equipment and technologies for treating oil-coated waste gas often rely on cooling water or chilled water for condensation, resulting in both gaseous and liquid hazardous chemicals that require separate treatment. Traditional waste gas treatment technologies and devices suffer from low energy efficiency, with significant heat loss during medium transfer, leading to high energy consumption and increasing the economic burden on enterprises in the long run. Furthermore, waste gas treatment equipment is bulky, and traditional systems typically consist of multiple devices that must be combined to form a complete system. This not only increases equipment costs but also makes operation inconvenient, often leading to operational problems during the process. Maintenance is also extensive and costly. Existing equipment structures are complex and space-consuming, resulting in poor overall system integration and efficiency. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The technical problem this invention aims to solve is that existing waste gas treatment equipment has high operating costs and low functional integration.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] This invention provides a multi-stage treatment device for lithium-ion membrane oil-coated waste gas, used to treat high-temperature NMP waste gas. It includes a waste gas buffer chamber, a filtration chamber, an atomization chamber, a primary condensation chamber, a final condensation chamber, a tail gas chamber, and a liquid collection chamber. The filtration chamber filters the high-temperature NMP waste gas to form NMP filtered gas. The atomization chamber, primary condensation chamber, and final condensation chamber exchange heat with the NMP filtered gas to condense it into NMP liquid. The tail gas chamber collects uncondensed NMP filtered gas. The inlet of the liquid collection chamber is connected to the atomization chamber, primary condensation chamber, final condensation chamber, and tail gas chamber, respectively, and the liquid collection chamber collects the NMP liquid.

[0009] Preferably, the filtration chamber is equipped with a gas filter.

[0010] Preferably, the atomizing chamber is provided with a first filter assembly, which includes a tubular heat exchanger, an infusion pipe, and an explosion-proof pump. The tubular heat exchanger is located in the atomizing chamber, the explosion-proof pump is connected to the infusion pipe, the inlet end of the infusion pipe is connected to the liquid collection chamber, the outlet end of the infusion pipe is connected to the tubular heat exchanger, and the outlet of the tubular heat exchanger is connected to the liquid collection assembly.

[0011] Preferably, it also includes an automatic control valve, a liquid level detection instrument is provided in the liquid collection chamber, the automatic control valve is located on the infusion pipe, and the liquid level detection instrument is electrically connected to the explosion-proof pump and the automatic control valve respectively.

[0012] Preferably, the primary condensation chamber is provided with a second filtration assembly, which includes a plate heat exchanger, a gas supply pipe, and an explosion-proof fan. The plate heat exchanger is located in the primary condensation chamber, the explosion-proof fan is connected to the gas supply pipe, the inlet end of the gas supply pipe is connected to the exhaust gas chamber, the outlet end of the gas supply pipe is connected to the plate heat exchanger, and the outlet of the plate heat exchanger is connected to the exhaust gas scrubbing tower.

[0013] Preferably, the final condensation chamber is provided with a third filtration assembly, which includes a first plate heat exchanger, a cooling water supply pipe, a cooling water circuit pipe, and a first heat exchange component. The cooling water supply pipe is connected to the inlet end of the first heat exchange component and the first plate heat exchanger, and the cooling water circuit pipe is connected to the outlet end of the first heat exchange component and the first plate heat exchanger.

[0014] Preferably, the temperature of the cooling water circulating in the cooling water supply pipe and the cooling water circuit pipe is 12°C to 17°C.

[0015] Preferably, the exhaust chamber is provided with a fourth filter assembly, which includes a second plate heat exchanger, a chilled water supply pipe, a chilled water circuit pipe, and a second heat exchange assembly. The chilled water supply pipe is connected to the inlet end of the second heat exchange assembly and the second plate heat exchanger, and the chilled water circuit pipe is connected to the outlet end of the second heat exchange assembly and the second plate heat exchanger.

[0016] Preferably, the temperature of the chilled water circulating in the chilled water supply pipe and the chilled water circuit pipe is 5°C to 8°C.

[0017] Preferably, the system further includes an NMP concentration detector and an emergency discharge valve. The NMP concentration detector is installed in the filtration chamber, the atomization chamber, the primary condensation chamber, the final condensation chamber, the exhaust gas chamber, and the liquid collection chamber. The emergency discharge valve is connected to the exhaust gas chamber and the gas collection tank, and the NMP concentration detector is electrically connected to the emergency discharge valve.

[0018] (III) Beneficial Effects

[0019] The above-mentioned technical solution of this utility model has at least the following advantages:

[0020] The multi-stage treatment device for lithium-ion membrane oil coating exhaust gas provided in this embodiment consists of an exhaust gas buffer chamber, a filtration chamber, an atomization chamber, a primary condensation chamber, a final condensation chamber, a tail gas chamber, and a liquid collection chamber. The NMP exhaust gas generated after oil-based membrane coating production is separated into gas and liquid components after heat exchange reactions in each chamber of this device. A dedicated collection chamber or process completes the collection work. The NMP concentration in the tail gas is significantly reduced, and both the tail gas and condensate are fully utilized, thereby improving the overall energy efficiency of the device. Furthermore, it is equipped with safety devices to ensure not only the safe operation of the device itself but also to provide safety assurance for the oil coating production line. This utility model has a simple and reasonable structure; low equipment cost; high energy efficiency; and an overall highly efficient treatment system. It is convenient to operate in actual production, requires few maintenance procedures, and has low costs, exhibiting high integration. This utility model not only achieves multi-stage and multiple-stage treatment of exhaust gas but also integrates the functions of multiple devices in traditional methods into a single unit. The overall system of this device also possesses strong self-control and integration capabilities. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the lithium-ion membrane oil-coated multi-stage waste gas treatment device provided in this embodiment of the utility model.

[0023] The labels for the attached figures are as follows:

[0024] 1. Exhaust gas buffer chamber; 2. Filtration chamber; 3. Atomization chamber; 4. Primary condensation chamber; 5. Final condensation chamber; 6. Tail gas chamber; 7. Liquid collection chamber; 8. Liquid collection assembly; 9. Tail gas scrubbing tower; 10. NMP concentration detector; 11. Emergency discharge valve; 12. Gas collection tank; 21. Gas filter; 31. Tubular heat exchanger; 32. Liquid delivery pipe; 33. Explosion-proof pump; 41. Plate heat exchanger; 42. Gas delivery pipe; 43. Explosion-proof fan; 51. First plate heat exchanger; 52. Cooling water supply pipe; 53. Cooling water return pipe; 61. Second plate heat exchanger; 62. Chilled water supply pipe; 63. Chilled water return pipe; 71. Automatic control valve; 72. Liquid level detection instrument; 73. First condensate collection pipe; 74. Second condensate collection pipe; 75. Automatic exhaust valve. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be located directly on or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component.

[0027] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or the number of technical features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. The specific implementation of this utility model is described in more detail below with reference to specific embodiments:

[0029] like Figure 1As shown, this utility model embodiment provides a multi-stage treatment device for lithium-ion membrane oil-coated waste gas, used to treat high-temperature NMP waste gas, including a waste gas buffer chamber 1, a filter chamber 2, an atomization chamber 3, a primary condensation chamber 4, a final condensation chamber 5, an exhaust gas chamber 6, and a liquid collection chamber 7; the filter chamber 2 is used to filter the high-temperature NMP waste gas to form NMP filtered gas; the atomization chamber 3, the primary condensation chamber 4, and the final condensation chamber 5 are used to exchange heat with the NMP filtered gas to condense the NMP filtered gas into NMP liquid (including NMP collected liquid condensed in the atomization chamber 3 and NMP condensate condensed in the primary condensation chamber 4 and the final condensation chamber 5); the exhaust gas chamber 6 is used to collect the uncondensed NMP filtered gas (i.e., exhaust gas); the inlet of the liquid collection chamber 7 is connected to the atomization chamber 3, the primary condensation chamber 4, the final condensation chamber 5, and the exhaust gas chamber 6, respectively, and the liquid collection chamber 7 is used to collect NMP liquid. Specifically, the high-temperature NMP exhaust gas generated by the oil coating production line first enters the exhaust gas buffer chamber 1 of this unit through the production line exhaust duct to buffer and store the exhaust gas.

[0030] As one optional implementation of this embodiment, a gas filter 21 is provided in the filter chamber 2. Specifically, the exhaust gas passes through the gas filter 21 before undergoing heat exchange treatment to form NMP filtered gas, thereby reducing the impact of foreign objects in the duct on the treated exhaust gas and condensate.

[0031] In one optional embodiment of this invention, a first filter assembly is provided in the atomization chamber 3. The first filter assembly includes a tubular heat exchanger 31, a liquid delivery pipe 32, and an explosion-proof pump 33. The tubular heat exchanger 31 is located in the atomization chamber 3, and the explosion-proof pump 33 is connected to the liquid delivery pipe 32. The inlet end of the liquid delivery pipe 32 is connected to the liquid collection chamber 7, and the outlet end of the liquid delivery pipe 32 is connected to the tubular heat exchanger 31. The outlet of the tubular heat exchanger 31 is connected to the liquid collection assembly 8. Specifically, the tubular heat exchanger 31 is used to exchange heat with the NMP filtered gas. The heat exchange medium used in the tubular heat exchanger 31 is NMP collected liquid and NMP condensate. Since the NMP collected liquid and NMP condensate will be distilled or collected and then sent to a specialized factory for treatment, the NMP waste liquid needs to be heated before the reaction in the distillation unit. Therefore, using the low-temperature NMP condensate to exchange heat with the high-temperature NMP waste gas can improve energy utilization efficiency. After passing through the gas-liquid heat exchanger in the first filtration component, the NMP exhaust gas reaches the atomization chamber 3. At this point, the temperature of the high-temperature NMP exhaust gas has relatively decreased. As the device operates for longer, tiny condensate droplets will form in the atomization chamber 3. These droplets will adhere to the inner wall of the chamber and eventually be collected in the collection chamber 7 by the first condensate collection pipe 73. The upper part of the first condensate collection pipe 73 has a funnel-shaped opening, and the area of ​​the opening covers more than 75% of both the atomization chamber 3 and the air-cooling chamber 4 to facilitate collection. The lower discharge port of the first condensate collection pipe 73 is usually placed below the surface of the NMP condensate to prevent the filtered, purified, and air-cooled NMP exhaust gas from having an unnecessary impact on the NMP gas concentration and liquid temperature in the collection chamber 7.

[0032] As one of the optional embodiments of this example, it also includes an automatic control valve 71, a liquid level detection instrument 72 is provided in the liquid collection chamber 7, the automatic control valve 71 is provided on the infusion pipe 32, and the liquid level detection instrument 72 is electrically connected to the explosion-proof pump 33 and the automatic control valve 71 respectively. Specifically, the collection chamber 7 is equipped with a level detector 72 to monitor the level of NMP condensate at all times. A target value can be set for the level. When the level reaches the target value, a signal is transmitted to the automatic control valve 71 and the explosion-proof pump 33 to start. When the level detector 72 detects that the liquid level is lower than the target value, it automatically closes the automatic control valve 71 and stops the explosion-proof pump 33, thus completing the closed-loop control of NMP condensate transmission. During normal operation, the device adjusts the working output power of the explosion-proof pump 33 according to the NMP condensate generation rate and the level of the collection chamber 7, thereby achieving a dynamic balance between liquid generation and transmission in the collection chamber 7. At the same time, it ensures that the lower discharge ports of the first condensate collection pipe 73 and the second condensate collection pipe 74 are always below the liquid level, ensuring that the gas and liquid in each chamber are separated.

[0033] In one optional implementation of this embodiment, the primary condensation chamber 4 is equipped with a second filter assembly, which includes a plate heat exchanger 41, a gas supply pipe 42, and an explosion-proof fan 43. The plate heat exchanger 41 is located inside the primary condensation chamber 4, and the explosion-proof fan 43 is connected to the gas supply pipe 42. The inlet end of the gas supply pipe 42 is connected to the exhaust gas chamber 6, and the outlet end of the gas supply pipe 42 is connected to the plate heat exchanger 41. The outlet of the plate heat exchanger 41 is connected to the exhaust gas scrubbing tower 9. Specifically, the atomized NMP exhaust gas undergoes a heat exchange reaction through the second filter assembly before reaching the primary condensation chamber 4. The heat exchange medium used in the plate heat exchanger is the low-temperature NMP exhaust gas (i.e., the uncondensed NMP filtered gas) after final condensation of the NMP exhaust gas, with a temperature below 10°C. Since the low-concentration NMP waste gas needs to undergo a water washing process after condensation before it can meet emission standards, and the low temperature of the gas is not conducive to its dissolution by water washing, energy consumption can be reduced by exchanging heat with the atomized NMP waste gas. Both the atomization chamber 3 and the primary condensation chamber 4 are equipped with a second condensate collection pipe 74 to collect and summarize the generated NMP waste liquid.

[0034] In one optional implementation of this embodiment, the final condensation chamber 5 is equipped with a third filter assembly, which includes a first plate heat exchanger 51, a cooling water supply pipe 52, a cooling water circuit pipe 53, and a first heat exchange assembly (not shown). The cooling water supply pipe 52 is connected to the inlet end of the first heat exchange assembly and the first plate heat exchanger 51, and the cooling water circuit pipe 53 is connected to the outlet end of the first heat exchange assembly and the first plate heat exchanger 51. The temperature of the cooling water circulating in the cooling water supply pipe 52 and the cooling water circuit pipe 53 is 12°C to 17°C. Specifically, after the NMP exhaust gas passes through the atomization chamber 3 and the initial condensation chamber 4, its temperature has been significantly reduced. At this time, the gas will undergo further heat exchange in the initial condensation process. The initial condensation process uses the first plate heat exchanger 51, which has a higher heat exchange area and heat exchange efficiency, to treat the air-cooled NMP exhaust gas. The heat exchange medium is cooling water at 12°C to 17°C. Cooling water exchanges heat with the air-cooled NMP exhaust gas via cooling water supply pipe 52, first plate heat exchanger 51, and cooling water circuit pipe 53, forming the initial condensation process of this step. The NMP initial condensate will form a liquid accumulation at the bottom of the final condensation chamber 5. The NMP liquid accumulation reaches the collection chamber 7 via the second condensate collection pipe 74. The lower discharge port of the second condensate collection pipe 74 is usually placed below the liquid surface of the NMP condensate.

[0035] In one optional embodiment of this invention, the exhaust chamber 6 is provided with a fourth filter assembly. The fourth filter assembly includes a second plate heat exchanger 61, a chilled water supply pipe 62, a chilled water return pipe 63, and the second heat exchange assembly. The chilled water supply pipe 62 is connected to the inlet ends of the second heat exchange assembly and the second plate heat exchanger 61, and the chilled water return pipe 63 is connected to the outlet ends of the second heat exchange assembly and the second plate heat exchanger 61. The temperature of the chilled water circulating in the chilled water supply pipe 62 and the chilled water return pipe 63 is 5°C to 8°C. Specifically, the concentration and temperature of the NMP exhaust gas after the final condensation process in the final condensation chamber 5 will be significantly lower. At the end of the final condensation chamber 5 (the beginning of the exhaust gas chamber 6), the gas will exchange heat with the chilled water through the second plate heat exchanger 61. The chilled water temperature used in this process is 5-8°C, which can obtain exhaust gas with the lowest possible NMP content. Furthermore, because the NMP exhaust gas produced in this process is very low in temperature, it can be used as a heat transfer medium for the air cooling process in the primary condensation chamber 4 to perform heat exchange treatment on the atomized NMP exhaust gas. The chilled water in the final condensation chamber 6 exchanges heat with the air-cooled NMP exhaust gas through the chilled water supply pipe 62, the second plate heat exchanger 61, and the chilled water circuit pipe 63. The NMP condensate will form a liquid accumulation at the bottom of the final condensation chamber 6, and the NMP liquid accumulation will reach the collection chamber 7 through the second condensate collection pipe 74. The final condensation chamber 5 and the tail gas chamber 6 share a second condensate collection pipe 74 for unified collection and treatment of NMP condensate. The lower opening of the collection pipe is usually placed below the liquid surface of the collection chamber 7 and is linked with each part to ensure that the gas and liquid in each chamber are separated and that the NMP gas concentration is always under monitoring.

[0036] Furthermore, the NMP condensate in the collection chamber 7 is mainly collected from the condensates generated by the atomization, air cooling, primary condensation, and final condensation processes. Since the condensate generated by the primary and final condensation processes accounts for a very large proportion, the condensate temperature in the collection chamber 7 will be relatively low. The NMP condensate is sent to the tubular heat exchanger 31 via the delivery pipe 32 and the explosion-proof pump 33 to exchange heat with the high-temperature NMP exhaust gas. This is also the first heat exchange after the NMP exhaust gas is generated from the oil coating production line. After the heat exchange, the NMP exhaust gas will arrive at the primary condensation chamber 4 for further treatment, while the heated NMP condensate will be transported to the collection assembly 8 (such as a distillation device or waste liquid collection device) through the condensate discharge pipe to complete the final treatment of the NMP condensate.

[0037] As one optional implementation of this embodiment, it also includes an NMP concentration detector 10 and an emergency exhaust valve 11. The NMP concentration detector 10 is installed in the filter chamber 2, atomization chamber 3, primary condensation chamber 4, final condensation chamber 5, exhaust gas chamber 6, and collection chamber 7. The emergency exhaust valve 11 connects the exhaust gas chamber 6 and the gas collection tank 12, and the NMP concentration detector 10 is electrically connected to the emergency exhaust valve 11. An automatic exhaust valve 75 is provided above the collection chamber 7, connecting the collection chamber 7 and the filter chamber 2. Specifically, each chamber is equipped with an NMP concentration detector 10 to monitor the changes in gaseous NMP concentration inside the device at all times. The monitoring of the collection chamber 7 is particularly important. Due to the long-term closure, liquid evaporation, and changes in ambient temperature, it is necessary to deal with the gaseous NMP and backflow in a timely manner. The detection target threshold of the NMP concentration detector 10 in the collection chamber 7 will be lowered to about 2 / 3 of the normal concentration range. When the target threshold is reached, the automatic exhaust valve 75 will be activated to discharge the NMP gas in the collection chamber 7 to the filter chamber 2 for unified treatment. If any NMP concentration detector 10 in any chamber of this device exceeds the warning value, that is, exceeds the explosion limit and poses an explosion hazard, the emergency exhaust valve 11 above the tail gas chamber 6 will be activated immediately, and the automatic exhaust valve 75 will also be opened simultaneously to discharge the gas of this device to the carbon fiber emergency tail gas adsorption tank (gas collection tank 12). Moreover, the emergency exhaust system of this device can be linked with the oil coating production line as a joint emergency treatment device to further improve the safety performance of the equipment.

[0038] The lithium-ion membrane oil-coated multi-stage waste gas treatment device provided in this embodiment has a simple and reasonable structure; low equipment cost; high energy utilization efficiency; and overall high efficiency of the treatment system. It is easy to operate in actual production, with few maintenance procedures and low cost, and has high integration. This device can not only realize multi-stage and multiple treatment of waste gas, but also integrate the functions of multiple devices in traditional methods into one device. The overall system of the device has strong self-control and integration.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-stage waste gas treatment device with lithium-ion membrane oil coating, characterized in that, This device is used to treat high-temperature NMP exhaust gas and includes an exhaust gas buffer chamber, a filtration chamber, an atomization chamber, a primary condensation chamber, a final condensation chamber, an exhaust gas chamber, and a liquid collection chamber. The filtration chamber filters the high-temperature NMP exhaust gas to form NMP filtered gas. The atomization chamber, primary condensation chamber, and final condensation chamber exchange heat with the NMP filtered gas to condense it into NMP liquid. The exhaust gas chamber collects any uncondensed NMP filtered gas. The inlet of the liquid collection chamber is connected to the atomization chamber, primary condensation chamber, final condensation chamber, and exhaust gas chamber, respectively, and the liquid collection chamber collects the NMP liquid.

2. The lithium-ion membrane oil-coated multi-stage waste gas treatment device as described in claim 1, characterized in that, The filtration chamber is equipped with a gas filter.

3. The lithium-ion membrane oil-coated multi-stage waste gas treatment device as described in claim 1, characterized in that, The atomizing chamber is equipped with a first filter assembly, which includes a tubular heat exchanger, a delivery pipe, and an explosion-proof pump. The tubular heat exchanger is located in the atomizing chamber, the explosion-proof pump is connected to the delivery pipe, the inlet end of the delivery pipe is connected to the liquid collection chamber, the outlet end of the delivery pipe is connected to the tubular heat exchanger, and the outlet of the tubular heat exchanger is connected to the liquid collection assembly.

4. The lithium-ion membrane oil-coated multi-stage waste gas treatment device as described in claim 3, characterized in that, It also includes an automatic control valve, a liquid level detection instrument is provided in the liquid collection chamber, the automatic control valve is located on the infusion pipe, and the liquid level detection instrument is electrically connected to the explosion-proof pump and the automatic control valve respectively.

5. The lithium-ion membrane oil-coated multi-stage waste gas treatment device as described in claim 1, characterized in that, The primary condensation chamber is equipped with a second filtration assembly, which includes a plate heat exchanger, a gas supply pipe, and an explosion-proof fan. The plate heat exchanger is located in the primary condensation chamber, the explosion-proof fan is connected to the gas supply pipe, the inlet end of the gas supply pipe is connected to the tail gas chamber, the outlet end of the gas supply pipe is connected to the plate heat exchanger, and the outlet of the plate heat exchanger is connected to the tail gas scrubbing tower.

6. The lithium-ion membrane oil-coated multi-stage waste gas treatment device as described in claim 1, characterized in that, The final condensation chamber is equipped with a third filtration assembly, which includes a first plate heat exchanger, a cooling water supply pipe, a cooling water circuit pipe, and a first heat exchange component. The cooling water supply pipe is connected to the inlet end of the first heat exchange component and the first plate heat exchanger, and the cooling water circuit pipe is connected to the outlet end of the first heat exchange component and the first plate heat exchanger.

7. The lithium-ion membrane oil-coated multi-stage waste gas treatment device as described in claim 6, characterized in that, The temperature of the cooling water circulating in the cooling water supply pipe and cooling water circuit pipe is 12℃~17℃.

8. The lithium-ion membrane oil-coated multi-stage waste gas treatment device as described in claim 1, characterized in that, The exhaust chamber is equipped with a fourth filter assembly, which includes a second plate heat exchanger, a chilled water supply pipe, a chilled water return pipe, and a second heat exchange assembly. The chilled water supply pipe is connected to the inlet end of the second heat exchange assembly and the second plate heat exchanger, and the chilled water return pipe is connected to the outlet end of the second heat exchange assembly and the second plate heat exchanger.

9. The lithium-ion membrane oil-coated multi-stage waste gas treatment device as described in claim 8, characterized in that, The temperature of the chilled water circulating in the chilled water supply pipe and the chilled water return pipe is 5℃~8℃.

10. The lithium-ion membrane oil-coated multi-stage waste gas treatment device as described in claim 1, characterized in that, It also includes an NMP concentration detector and an emergency discharge valve. The NMP concentration detector is installed in the filtration chamber, the atomization chamber, the primary condensation chamber, the final condensation chamber, the exhaust gas chamber, and the liquid collection chamber. The emergency discharge valve is connected to the exhaust gas chamber and the gas collection tank, and the NMP concentration detector is electrically connected to the emergency discharge valve.

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