A dual-layer NMP exhaust gas recovery and treatment integrated device

Abstract

This application relates to the technical field of chemical waste gas treatment equipment, and in particular to a dual-layer NMP tail gas recovery and treatment integrated device, including a liquid receiving structure, a lower treatment structure disposed on the liquid receiving structure, and an upper treatment structure. The upper treatment structure includes a support frame and an outer shell disposed on the support frame, the support frame and the outer shell enclosing to form an upper cavity. A heat recovery component, a filter component, a cooling and freezing component, a wire mesh component, and a fan component are sequentially connected within the upper cavity. The fan component is connected to a pipe assembly, which includes a return air duct and an exhaust duct connected to the return air duct. The return air duct is connected to the heat recovery component. The lower treatment structure has the same structure as the upper treatment structure. The lower and upper treatment structures form a vertical dual-layer structure and simultaneously treat NMP waste gas, increasing space utilization in both the vertical and horizontal directions and improving waste gas treatment efficiency.

Description

Technical Field

[0001] This application relates to the technical field of chemical waste gas treatment equipment, and in particular to a dual-layer NMP tail gas recovery and treatment integrated device. Background Technology

[0002] NMP exhaust gas is a type of chemical waste gas. Large quantities of NMP are produced during lithium battery production. This NMP exhaust gas needs to be treated and recovered promptly before being released to reduce production costs and avoid environmental pollution. Refrigeration recovery is an important method for treating NMP exhaust gas. The waste gas is concentrated to a certain concentration and then passed into a waste gas treatment device. This device uses cooling water and chilled water coils to condense the NMP from the air, which is then collected and purified to achieve recovery.

[0003] As production capacity increases, the amount of NMP exhaust gas that needs to be treated also increases. In particular, large-scale production will generate a large amount of NMP exhaust gas in a short period of time. If conventional exhaust gas treatment equipment is used, multiple equipment will need to be installed to meet the treatment needs. These exhaust gas treatment equipment will occupy a lot of installation space and significantly increase the cost of exhaust gas treatment. Utility Model Content

[0004] The purpose of this application is to provide a dual-layer NMP exhaust gas recovery and treatment integrated device, which aims to improve the problem that conventional exhaust gas treatment equipment in related technologies requires a large amount of installation space, making the exhaust gas treatment equipment compact and reducing treatment costs.

[0005] This application provides a dual-layer NMP exhaust gas recovery and treatment integrated device, including a liquid receiving structure, a lower treatment structure disposed on the liquid receiving structure, and an upper treatment structure; the upper treatment structure includes a support frame and an outer shell disposed on the support frame, the support frame and the outer shell enclosing to form an upper cavity; the upper cavity is provided with a heat recovery component, a filter component, a cooling and freezing component, a wire mesh component, and a fan component connected in sequence, the fan component is connected to a pipe component, the pipe component includes a return air pipe and an exhaust pipe connected to the return air pipe, the return air pipe is connected to the heat recovery component; the structure of the lower treatment structure is the same as the structure of the upper treatment structure.

[0006] Furthermore, the heat recovery assembly includes a counter-flow heat exchanger having an air inlet, an air outlet, a return air inlet, and a return air outlet; the air outlet is connected to the filter assembly; and the return air inlet is connected to the return air duct.

[0007] Furthermore, the return air duct turns back from its connection with the fan assembly and extends along the length of the outer casing before connecting to the return air inlet of the counter-flow heat exchanger.

[0008] Furthermore, the tailpipe is connected to the end of the return air duct near the counter-flow heat exchanger.

[0009] Furthermore, the filter assembly includes a plate filter, one end of which faces the air outlet, and the other end of which is connected to the cooling and refrigeration assembly.

[0010] Furthermore, the cooling and freezing assembly includes a microchannel cooler and an aluminum pipe surface cooler connected in sequence, the microchannel cooler facing the plate filter, and the aluminum pipe surface cooler connected to the wire mesh assembly.

[0011] Furthermore, the outer casing is hinged with a first inspection door and a second inspection door, the first inspection door being located between the heat recovery assembly and the filter assembly; the second inspection door being located between the cooling and freezing assembly and the wire mesh assembly.

[0012] Furthermore, the liquid receiving structure includes a base and a liquid receiving tray disposed on the base, the liquid receiving tray being inclined.

[0013] The beneficial effects of this application are:

[0014] 1. This application discloses a dual-layer NMP exhaust gas recovery and treatment integrated device. By setting up a lower treatment structure and an upper treatment structure in the liquid-receiving structure, the upper treatment structure is sequentially equipped with several functional components. After the exhaust gas enters the upper treatment structure, it sequentially enters a heat recovery component, a filtration component, a cooling and freezing component, a wire mesh component, and a pipeline component for corresponding treatment before being discharged and returned. The returned low-temperature exhaust gas returns to the heat recovery component to cool the high-temperature exhaust gas, effectively reducing the energy consumption required by the integrated recovery and treatment device. Simultaneously, the lower and upper treatment structures form a vertical dual-layer structure, treating the NMP exhaust gas simultaneously, increasing vertical space utilization and thus improving the overall space utilization rate to reduce the required floor space. This effectively improves the exhaust gas treatment capacity of the integrated recovery and treatment device and reduces production costs.

[0015] 2. The present application discloses a dual-layer NMP exhaust gas recovery and treatment integrated device. The upper treatment structure is provided with heat recovery components, filter components, cooling and freezing components, wire mesh components, fan components, and pipe components connected in sequence. The pipe components are provided with return air ducts that turn back, so that each component is arranged in an orderly manner on the support frame and laid along the length of the outer shell. The components of the upper treatment structure are reasonably distributed, making the upper treatment structure compact, effectively saving horizontal space, and further improving space utilization. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of a dual-layer NMP exhaust gas recovery and treatment integrated device provided in an embodiment of this application;

[0017] Figure 2 This is a front view of a dual-layer NMP exhaust gas recovery and treatment integrated device provided in an embodiment of this application;

[0018] Figure 3 yes Figure 2 A cross-sectional view along the AA direction.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Liquid receiving structure; 11. Base; 2. Lower treatment structure; 3. Upper treatment structure; 31. Support frame; 32. Outer shell; 321. First inspection door; 322. Second inspection door; 33. Heat recovery assembly; 331. Counterflow heat exchanger; 34. Filter assembly; 341. Plate filter; 35. Cooling and freezing assembly; 351. Microchannel cooler; 352. Aluminum pipe surface cooler; 36. Wire mesh assembly; 361. Wire mesh demister; 37. Fan assembly; 371. Variable frequency fan; 38. Piping assembly; 381. Return air duct; 382. Tail exhaust duct. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0022] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0024] Reference Figure 1 as well as Figure 2This application provides a dual-layer NMP exhaust gas recovery and treatment integrated device, including a liquid receiving structure 1, a lower treatment structure 2 disposed on the liquid receiving structure 1, and an upper treatment structure 3, with the lower treatment structure 2 and the upper treatment structure 3 positioned above the liquid receiving structure 1. During operation, the lower treatment structure 2 and the upper treatment structure 3 respectively treat the NMP exhaust gas, and the liquid droplets generated during the NMP exhaust gas treatment are transferred to the liquid receiving structure 1 for collection.

[0025] Reference Figure 2 as well as Figure 3 Specifically, the liquid receiving structure 1 is used to collect condensed NMP droplets. The liquid receiving structure 1 is located at the bottom of the device. The liquid receiving structure 1 includes a base 11 and a liquid receiving tray (not shown in the figure) disposed on the base 11. The liquid receiving tray is fixedly disposed on the base 11. One end of the liquid receiving tray is higher than the other end in the width direction, that is, the liquid receiving tray is inclined. When the condensed NMP droplets generated by the upper and lower processing structures 2 and the upper processing structure 3 fall, the NMP droplets will drip onto the liquid receiving tray and move along the inclined direction of the liquid receiving tray to be collected, which is convenient for the operator to collect.

[0026] The lower processing structure 2 and the upper processing structure 3 are fixedly connected to the base 11. The upper processing structure 3 is located on the side of the lower processing structure 2 away from the base 11, and the structure of the lower processing structure 2 is the same as that of the upper processing structure 3, so that the lower processing structure 2 and the upper processing structure 3 form a double-layer duplex structure to save floor space while ensuring processing efficiency.

[0027] Taking the upper processing structure 3 as an example, the upper processing structure 3 includes a support frame 31 and an outer shell 32 disposed on the support frame 31. The support frame 31 and the outer shell 32 enclose each other to form an upper cavity. The upper cavity is provided with a heat recovery component 33, a filter component 34, a cooling and freezing component 35, a wire mesh component 36 and a fan component 37 connected in sequence. The fan component 37 is connected to a pipe component 38. The pipe component 38 includes a return air pipe 381 and a tailpipe 382 connected to the return air pipe 381. The return air pipe 381 is connected to the heat recovery component 33.

[0028] More specifically, the heat recovery assembly 33 includes a counter-flow heat exchanger 331 mounted on the support frame 31. The counter-flow heat exchanger 331 has an air inlet, an air outlet, a return air inlet, and a return air outlet. The air inlet is connected to external equipment or an air intake duct to allow NMP exhaust gas to enter. After heat exchange in the counter-flow heat exchanger 331, the exhaust gas is discharged from the air outlet, which is connected to the filter assembly 34. The return air inlet is connected to the return air duct 381 and is used to receive exhaust gas returning from the return air duct 381. After heat exchange in the counter-flow heat exchanger 331 via the return air duct 381, the exhaust gas is discharged from the return air outlet, which is connected to external equipment or a return air duct to allow the gas to return to the equipment. The counter-flow heat exchanger 331 serves as a cooling system for gas-to-gas heat exchange. The high-temperature exhaust gas entering from the air inlet exchanges heat with the exhaust gas that has undergone multi-stage cooling and condensation treatment, effectively reducing the temperature of the high-temperature exhaust gas. The exhaust gas that has undergone multi-stage cooling and condensation treatment returns to the equipment after its temperature rises. The waste heat of the high-temperature exhaust gas can be effectively utilized to achieve energy saving.

[0029] The filter assembly 34 includes a plate filter 341, one end of which faces the air outlet, and the other end of which is connected to the cooling and refrigeration assembly 35. The plate filter 341 is used to intercept organic particulate matter in the gas. Specifically, a G4+F8 plate filter 341 can be selected. When high-temperature exhaust gas passes through the plate filter 341, the plate filter 341 performs primary and secondary filtration on the high-temperature exhaust gas in sequence, and the organic particles in the high-temperature exhaust gas will be removed by the plate filter 341.

[0030] The cooling and refrigeration assembly 35 includes a microchannel cooler 351 and an aluminum pipe surface cooler 352 connected in sequence. The microchannel cooler 351 faces the plate filter 341, and the aluminum pipe surface cooler 352 is connected to the wire mesh assembly 36. The microchannel cooler 351, as a cooling system, uses cooling water for water-gas heat exchange. To achieve cooling water circulation, the outer casing 32 has a cooling water outlet and a cooling water inlet, which are connected to the microchannel cooler 351. The aluminum pipe surface cooler 352, as a cascade cryogenic system, uses chilled water or an ethylene glycol aqueous solution as the medium for heat exchange with the gas. To achieve solution medium circulation, the outer casing 32 has a chilled water inlet and a chilled water outlet, which are connected to the aluminum pipe surface cooler 352. After the exhaust gas passes through the aluminum pipe surface cooler 352, its NMP gas will condense and drip down. It can be understood that the upper and lower aluminum pipe surface coolers 352 can be directly connected to the liquid receiving tray so that the condensed NMP exhaust gas can drip directly onto the liquid receiving tray. Alternatively, the upper and lower aluminum pipe surface coolers 352 can transfer the dripping NMP droplets to the liquid receiving tray for collection through pipeline transportation. The choice can be made according to actual needs.

[0031] The wire mesh assembly 36 includes a wire mesh demister 361, located between the aluminum pipe surface cooler 352 and the fan assembly 37. The wire mesh demister 361 is used for gas-liquid separation of the condensed waste gas. After passing through the wire mesh demister 361, the liquid in the waste gas is separated and discharged through the separation drain pipe. The fan assembly 37 includes a variable frequency fan 371. By adjusting the speed of the variable frequency fan 371 according to the volume of waste gas to be treated, the gas flow rate can be ensured, achieving forced gas circulation.

[0032] To achieve a compact structure for the integrated recycling and processing device, in this embodiment, the return air duct 381 bends back from its connection with the fan assembly 37 and extends along the length of the outer casing 32 before connecting to the return air inlet of the counter-flow heat exchanger 331. The exhaust duct 382 is connected to the end of the return air duct 381 near the counter-flow heat exchanger 331. With this arrangement, the exhaust gas passing through the wire mesh demister 361 is recirculated through the return air duct 381, a portion of the exhaust gas is discharged through the exhaust duct 382, ​​and the remaining exhaust gas returns to the counter-flow heat exchanger 331 through the return air duct 381 for heat exchange and reheating before returning to the equipment. Both the return air duct 381 and the exhaust duct 382 are equipped with valves (not shown in the figure) to control the opening and closing of the ducts and the gas flow rate. The ratio of exhaust to return air can be adjusted by controlling the opening and closing of the valves and their degree of opening.

[0033] Furthermore, to facilitate maintenance of the integrated recycling and processing unit, the outer casing 32 is hinged with a first inspection door 321 and a second inspection door 322. The first inspection door 321 is located between the heat recovery assembly 33 and the filter assembly 34; the second inspection door 322 is located between the cooling and freezing assembly 35 and the wire mesh assembly 36. Spaces are provided between the heat recovery assembly 33 and the filter assembly 34, and between the cooling and freezing assembly 35 and the wire mesh assembly 36, for convenient operation and observation by personnel. Access to the integrated recycling and processing unit via the first inspection door 321 and the second inspection door 322 allows for easy inspection and maintenance of each component, increasing the ease of maintenance of the integrated unit.

[0034] The working principle of this application's dual-layer NMP exhaust gas recovery and treatment integrated device is as follows: High-temperature exhaust gas at approximately 120 degrees Celsius is discharged from equipment such as an oven or exhaust pipe and enters the integrated recovery and treatment device. The high-temperature exhaust gas enters the heat recovery component 33, where it undergoes gas-to-gas heat exchange, reducing its temperature to approximately 40 degrees Celsius. The cooled exhaust gas then enters the plate filter 341 for filtration and enters the cooling and freezing component 35. The microchannel cooler 351 cools the exhaust gas, reducing its temperature to approximately 15 degrees Celsius. Depending on the process and heat exchange medium, the aluminum pipe surface cooler 352 freezes the exhaust gas, reducing its temperature to 0 degrees Celsius or -35 degrees Celsius. During this process, the NMP in the exhaust gas condenses and falls into the liquid collection tray. After passing through the cooling and freezing component 35, the exhaust gas enters the wire mesh component 36, where it undergoes gas-liquid separation via the wire mesh demister 361. Finally, the exhaust gas enters the return air duct 381 for recirculation and then enters the counter-current heat exchanger 331 for reheating, restoring its temperature to approximately 110 degrees Celsius before returning to the equipment.

[0035] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A double-layered NMP tail gas recovery and treatment integrated device, characterized in that, The system includes a liquid receiving structure (1), a lower processing structure (2) disposed on the liquid receiving structure (1), and an upper processing structure (3). The upper processing structure (3) includes a support frame (31) and an outer shell (32) disposed on the support frame (31). The support frame (31) and the outer shell (32) enclose to form an upper cavity. The upper cavity is provided with a heat recovery assembly (33), a filter assembly (34), a cooling and freezing assembly (35), a wire mesh assembly (36), and a fan assembly (37) connected in sequence. The fan assembly (37) is connected to a pipe assembly (38). The pipe assembly (38) includes a return air pipe (381) and a tailpipe pipe (382) connected to the return air pipe (381). The return air pipe (381) is connected to the heat recovery assembly (33). The structure of the lower processing structure (2) is the same as that of the upper processing structure (3).

2. The double-layered NMP exhaust gas recovery and treatment integrated device according to claim 1, characterized in that, The heat recovery assembly (33) includes a counter-flow heat exchanger (331), which has an air inlet, an air outlet, a return air inlet, and a return air outlet; the air outlet is connected to the filter assembly (34); and the return air inlet is connected to the return air duct (381).

3. The double-layered NMP tail gas recovery and treatment integrated device according to claim 2, characterized in that, The return air duct (381) turns back from its connection with the fan assembly (37) and extends along the length of the outer casing (32) to connect to the return air inlet of the counter-flow heat exchanger (331).

4. The double-layered NMP tail gas recovery and treatment integrated device according to claim 3, characterized in that, The tailpipe (382) is connected to the end of the return air pipe (381) near the counter-flow heat exchanger (331).

5. The double-layered NMP exhaust gas recovery and disposal integrated device according to claim 2, characterized in that, The filter assembly (34) includes a plate filter (341), one end of which faces the air outlet, and the other end of which is connected to the cooling and freezing assembly (35).

6. The dual-layer NMP exhaust gas recovery and treatment integrated device according to claim 5, characterized in that, The cooling and freezing assembly (35) includes a microchannel cooler (351) and an aluminum pipe surface cooler (352) connected in sequence. The microchannel cooler (351) faces the plate filter (341), and the aluminum pipe surface cooler (352) is connected to the wire mesh assembly (36).

7. The integrated device for recovering and treating NMP exhaust gas in two layers according to any one of claims 1-6, characterized in that, The outer casing (32) is hinged with a first inspection door (321) and a second inspection door (322). The first inspection door (321) is located between the heat recovery assembly (33) and the filter assembly (34); the second inspection door (322) is located between the cooling and freezing assembly (35) and the wire mesh assembly (36).

8. The double-layered NMP exhaust gas recovery and treatment integrated device according to claim 1, characterized in that, The liquid receiving structure (1) includes a base (11) and a liquid receiving tray disposed on the base (11), the liquid receiving tray being inclined.

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