A high-efficiency recovery device for NMP-containing exhaust gas

Abstract

The present application relates to a kind of high-efficiency recovery device of NMP-containing exhaust gas.The device includes a recovery tower, a high-efficiency absorption assembly with an inclined plane, a spray absorption assembly, a high-efficiency heat recovery assembly, a recovery tank and a treatment chamber.The high-efficiency absorption assembly with an inclined plane is fixed to the recovery tower, the spray absorption assembly is arranged in the recovery tower, the spray absorption assembly is used for spray absorption of NMP-containing exhaust gas, the high-efficiency heat recovery assembly is fixed to the bottom of the recovery tower, the recovery tower is located above the recovery tank, the recovery tank is arranged at the bottom of the recovery tower, the treatment chamber is in communication with the recovery tank, and the high-efficiency absorption assembly with an inclined plane includes an absorption cone plate, a position limiting plate and an exhaust hole group.The present application has the following beneficial effects: a water curtain is formed at the upper end of the inclined plane of the high-efficiency absorption assembly with an inclined plane, which generates bubbles, increases the contact time and contact area of water and NMP-containing exhaust gas, increases the absorption efficiency of NMP, and is more environmentally friendly.The device can transfer the heat energy in the high-temperature NMP-containing exhaust gas just entering, has the effect of energy recovery, saves energy and protects the environment.Multiple sprayings can fully absorb NMP.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of NMP waste gas treatment, in particular to a high-efficiency recovery device for NMP-containing waste gas. BACKGROUND

[0002] NMP (N-methyl pyrrolidone) is a strong polar aprotic solvent with excellent performance, which has a series of advantages such as chemical stability, high temperature resistance, strong solubility, low volatility, high safety and low toxicity, and is widely used in lithium ion battery production as a solvent for PVDF adhesive.

[0003] In use, the adhesive is heated and dried, and the NMP in the solution is gasified to produce NMP waste gas. In the process of treating the waste gas, the NMP waste gas is usually treated after being cooled. In the treatment process, the length of gas flow is increased to increase the absorption of NMP, but the NMP recovery efficiency is low, and the exhaust gas is difficult to meet the environmental protection conditions. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a high-efficiency recovery device for NMP-containing waste gas.

[0005] The technical scheme adopted by the present application to solve the technical problems is:

[0006] A high-efficiency recovery device for NMP-containing waste gas, comprising a recovery tower, an inclined high-efficiency absorption assembly, a spray absorption assembly, a high-efficiency heat recovery assembly, a recovery tank and a treatment chamber, the inclined high-efficiency absorption assembly is fixedly connected to the recovery tower, the spray absorption assembly is arranged in the recovery tower, the spray absorption assembly is used for spraying and absorbing NMP waste gas, the high-efficiency heat recovery assembly is fixedly connected to the bottom of the recovery tower, the recovery tower is located above the recovery tank, the recovery tank is arranged at the bottom of the recovery tower, the treatment chamber is in communication with the recovery tank, the inclined high-efficiency absorption assembly comprises an absorption cone plate, a position limiting plate and a plurality of exhaust hole groups, the absorption cone plate is provided with a sliding rail, a plurality of position limiting plates are slidably connected in the sliding rail, and the plurality of position limiting plates are fixedly connected to the recovery tower, the bottom of the absorption cone plate is provided with a plurality of teeth, and the plurality of exhaust hole groups are fixedly connected to the absorption cone plate.

[0007] In the high-efficiency recovery device for NMP-containing waste gas, the inclined high-efficiency absorption assembly further comprises a gas collection cover, a rotating motor and a driving gear, the gas collection cover is fixedly connected to the recovery tower, the gas collection cover is located directly below the absorption cone plate, the rotating motor is fixedly connected to the gas collection cover, the driving gear is fixedly connected to the output shaft of the rotating motor, and the driving gear is in meshing transmission with the absorption cone plate.

[0008] In the high-efficiency recovery device for NMP-containing waste gas, the plurality of exhaust hole groups are circumferentially distributed on the absorption cone plate, and each of the plurality of exhaust hole groups comprises a plurality of through holes arranged in a matrix.

[0009] In the aforementioned high-efficiency recovery device for NMP-containing waste gas, the gas collection hood includes a collection hood body and supporting steel rods. Multiple supporting steel rods are fixed to the recovery tower, and the collection hood body is mounted on multiple supporting steel rods.

[0010] In the aforementioned high-efficiency recovery device for NMP-containing waste gas, the high-efficiency heat recovery component includes a cooling spiral tube, a curved exhaust pipe, a connecting pipe, and a heat exchange pipe. The cooling spiral tube is sleeved on the curved exhaust pipe, the heat exchange pipe is fixed to the right end of the curved exhaust pipe, the curved exhaust pipe is fixed to the connecting pipe, the connecting pipe is fixed to the recovery tower, and the curved exhaust pipe is provided with multiple rapid cooling holes for discharging NMP waste gas.

[0011] The aforementioned high-efficiency recovery device for NMP-containing waste gas also includes a waste gas pump, a control butterfly valve, a waste gas inlet pipe, a funnel-shaped polymerization frame, and a gas polymerization layer for conveying NMP waste gas to the recovery tower. The waste gas inlet pipe is fixed to the output end of the waste gas pump, the control butterfly valve is installed on the waste gas inlet pipe, the waste gas inlet pipe is fixed to the recovery tower, the funnel-shaped polymerization frame is fixed to the recovery tower, the gas polymerization layer is fixed to the funnel-shaped polymerization frame, and the waste gas inlet pipe is connected to a connecting pipe.

[0012] In the aforementioned high-efficiency recovery device for NMP-containing waste gas, the spray absorption assembly includes a circulating spray assembly and a pure water spray assembly. The pure water spray assembly is fixedly connected to the recovery tower and is located directly above the gas collection hood. The circulating spray assembly is connected to the recovery tank, and the upper part of the circulating spray assembly is fixedly connected to the recovery tower and is located directly above the first filter layer.

[0013] The aforementioned high-efficiency recovery device for NMP-containing waste gas also includes a first filter layer located between the upper part of the collection hood and the circulating spray assembly.

[0014] The aforementioned high-efficiency recovery device for NMP-containing waste gas also includes a demister layer, a demister layer support, a drying layer, and a tail gas discharge cylinder. The demister layer support is fixed to the recovery tower, the demister layer is fixed to the demister layer support, the drying layer is disposed on the recovery tower, and the tail gas discharge cylinder is fixed to the upper end of the recovery tower.

[0015] The aforementioned high-efficiency recovery device for NMP-containing waste gas also includes a second filter layer located between the pure water spray assembly and the demister support.

[0016] The beneficial effects of this invention are:

[0017] (1) The water curtain formed at the upper end of the inclined surface of the high-efficiency absorption component generates bubbles, which increases the contact time and contact area between water and NMP exhaust gas, thereby increasing the absorption efficiency of NMP. The NMP tail gas emission is less than 1mg / m³, which far exceeds the national emission standard and meets the EU emission requirements.

[0018] (2) It can transfer the heat energy in the newly entered high-temperature NMP exhaust gas, thus achieving the effect of energy recovery, saving energy and protecting the environment.

[0019] (3) Multiple sprays are used to fully absorb NMP. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is an overall diagram of the present invention;

[0022] Figure 2 This invention relates to a sloped high-efficiency absorption component;

[0023] Figure 3 For the present invention Figure 2 Enlarged view of a specific area;

[0024] Figure 4 This is a schematic diagram showing the connection between the absorption cone plate and the position limiting plate of the present invention;

[0025] Figure 5 The gas collection hood of the present invention;

[0026] Figure 6 This is a cross-sectional view of the high-efficiency heat recovery component of the present invention;

[0027] Figure 7 This invention relates to a high-efficiency heat recovery component.

[0028] In the diagram: 1. Recovery tower; 2. Inclined high-efficiency absorption assembly; 3. Waste gas pump; 4. Control butterfly valve; 5. Waste gas inlet pipe; 6. Funnel-type polymerization rack; 7. Gas polymerization layer; 8. Spray absorption assembly; 9. High-efficiency heat recovery assembly; 10. Circulating spray assembly; 11. Pure water spray assembly; 12. Demisting layer; 13. Demisting layer support; 14. Drying layer; 15. Tail gas discharge cylinder; 16. Recovery tank; 17. Cooling spiral tube; 18. Bent exhaust pipe; 181. Rapid cooling hole; 19. Connecting pipe; 20. Heat exchange tube; 21. Gas collection hood; 22. Absorption cone plate; 23. Position limiting plate; 24. Rotating motor; 25. Drive gear; 26. Sliding rail; 27. Exhaust hole group; 211. Collection hood; 212. Supporting steel rod; 102. First filter layer; 101. Second filter layer; 30. Processing chamber. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] This efficient NMP-containing waste gas recovery device can be referenced. Figures 1-7 An exemplary procedure for recovering NMP exhaust gases:

[0031] When drying the NMP solution, NMP evaporates along with water vapor, and the temperature rises above 100°C. Cooling is required before collecting the NMP waste gas. Therefore, a high-efficiency recovery device for NMP-containing waste gas is installed, including a recovery tower 1, an inclined high-efficiency absorption assembly 2, a spray absorption assembly 8, a high-efficiency heat recovery assembly 9, a recovery tank 16, and a treatment chamber 30. The inclined high-efficiency absorption assembly 2 is fixed to the recovery tower 1. The spray absorption assembly 8 is disposed in the recovery tower 1 and is used to spray and absorb the NMP waste gas. The high-efficiency heat recovery assembly 9 is fixed to the bottom of the recovery tower 1. The recovery tower 1 is located above the recovery tank 16. 6 is located at the bottom of the recovery tower 1, and the treatment chamber 30 is connected to the recovery tank 16. The inclined high-efficiency absorption component 2 includes an absorption cone plate 22, a position limiting plate 23, and an exhaust port group 27. A sliding rail 26 is provided on the absorption cone plate 22, and multiple position limiting plates 23 are slidably connected in the sliding rail 26. Multiple position limiting plates 23 are fixed to the recovery tower 1. Multiple teeth are provided at the bottom of the absorption cone plate 22, and multiple exhaust port groups 27 are fixed to the absorption cone plate 22. After entering the NMP waste gas, the high-temperature NMP waste gas is rapidly cooled by the high-efficiency heat recovery component 9. The liquid of the high-efficiency heat recovery component 9 reacts with the high-temperature NMP waste gas. Heat exchange is performed to recover the energy of the NMP exhaust gas, cooling it down. Some of the NMP liquefies along with the water vapor during cooling and enters the recovery tank 16. The remaining NMP exhaust gas continues to rise, passing through the spray absorption assembly 8 for absorption, and then enters the bottom of the inclined high-efficiency absorption assembly 2. The spray absorption assembly 8 sprays onto the upper part of the inclined high-efficiency absorption assembly 2. At this point, the NMP exhaust gas rises to the bottom of the absorption cone plate 22. Because the side surface of the absorption cone plate 22 is inclined, the NMP exhaust gas rises along the surface after entering. During this upward movement, multiple exhaust hole groups 27 pass through, simultaneously passing through the sprayed surface of the inclined high-efficiency absorption assembly 2. The water curtain formed at the end generates bubbles, increasing the contact time and area between water and NMP exhaust gas. This allows for the absorption of more NMP through this spraying process, resulting in highly efficient NMP absorption. The NMP-containing solution flows down into the recovery tank 16. Once the NMP concentration in the recovery tank 16 reaches the set standard, it is pumped into the treatment chamber for recycling. Through this process, NMP exhaust gas can be treated quickly and efficiently, absorbing NMP from the exhaust gas. At the same time, the high-efficiency heat recovery component 9 can transfer the heat energy from the newly entered high-temperature NMP exhaust gas, achieving energy recovery and saving energy and protecting the environment.

[0032] This efficient NMP-containing waste gas recovery device can be referenced. Figures 1-5 An exemplary operating process for guiding NMP exhaust gas to the absorption cone plate:

[0033] The inclined high-efficiency absorption assembly 2 also includes a gas collection hood 21, a rotating motor 24, and a drive gear 25. The gas collection hood 21 is fixed to the recovery tower 1 and is located directly below the absorption cone plate 22. The rotating motor 24 is fixed to the gas collection hood 21, and the drive gear 25 is fixed to the output shaft of the rotating motor 24. The drive gear 25 meshes with the absorption cone plate 22 for transmission. The diameter of the air inlet of the gas collection hood 21 decreases from large to small, which is more effective in concentrating the NMP waste gas, allowing the NMP waste gas to move directly towards the absorption cone plate 22. The rotating motor 24 can be started to rotate the drive gear 25, thereby rotating the absorption cone plate 22 that meshes with the drive gear 25. During the rotation of the absorption cone plate 22, there is continuously sprayed water on the absorption cone plate 22, which rotates with the absorption cone plate 22. During the rotation, the water bubbles formed by the NMP waste gas rotate with it, increasing the contact time between the water and the NMP waste gas, further accelerating the absorption of NMP in the NMP waste gas by the water, and increasing the efficiency of NMP absorption.

[0034] This efficient NMP-containing waste gas recovery device can be referenced. Figure 3 An exemplary process for improving NMP absorption in NMP exhaust gas by using multiple exhaust port groups:

[0035] Multiple exhaust port groups 27 are evenly distributed circumferentially on the absorption cone plate 22. Each exhaust port group 27 includes multiple through holes arranged in a matrix. After the NMP exhaust gas enters the absorption cone plate 22, it continues upward through the multiple through holes arranged in a matrix on the multiple exhaust port groups 27. Through the multiple densely arranged through holes arranged in a matrix, sufficient discharge space can be provided for the NMP exhaust gas. Moreover, the size of the bubbles formed during discharge will not be too large, and fine small bubbles will be generated, which can increase the contact area between NMP and water and accelerate the absorption efficiency of NMP in the NMP exhaust gas.

[0036] This efficient NMP-containing waste gas recovery device can be referenced. Figure 5 An exemplary working process for the centralized delivery of NMP to the absorption cone plate:

[0037] The gas collection hood 21 includes a collection hood body 211 and supporting steel rods 212. Multiple supporting steel rods 212 are fixed to the recovery tower 1. The collection hood body 211 is "trumpet-shaped" and is set on multiple supporting steel rods 212. The collection hood body 211 is supported by multiple supporting steel rods 212. The NMP gas is guided by the "trumpet-shaped" collection hood body 211. Then the gas enters the absorption cone plate 22. Due to the reduction of the gas flow area, the gas flow speed is increased, making it easier to form bubbles on multiple exhaust hole groups 27, thereby increasing the rate of gas absorption.

[0038] This efficient NMP-containing waste gas recovery device can be referenced.Figures 6-7 An exemplary operating process for rapid cooling of NMP exhaust gas upon entry:

[0039] The high-efficiency heat recovery assembly 9 includes a cooling spiral tube 17, a curved exhaust pipe 18, a connecting pipe 19, and a heat exchange pipe 20. The cooling spiral tube 17 is sleeved on the curved exhaust pipe 18, and the heat exchange pipe 20 is fixed to the right end of the curved exhaust pipe 18. The curved exhaust pipe 18 is fixed to the connecting pipe 19, which is fixed to the recovery tower 1. The curved exhaust pipe 18 is provided with multiple rapid cooling holes 181 for discharging NMP exhaust gas. The rapid cooling holes 181 penetrate the curved exhaust pipe 18. After the NMP exhaust gas enters, it enters the connecting pipe 19 and then enters the curved exhaust pipe 18. It moves within the curved exhaust pipe 18 and is discharged through the multiple rapid cooling holes 181. The curved exhaust pipe 18 has a symmetrical structure. No rapid cooling holes 181 are provided on the straight pipe leading to the NMP exhaust gas. Coolant is introduced into the heat exchange pipe 20. After the NMP exhaust gas enters, it exchanges heat with the heat exchange pipe 20 and then exits through multiple rapid cooling holes 181. The sprayed NMP exhaust gas exits through the gaps in the heat exchange pipe 20, increasing the contact time and area between the heat exchange pipe 20 and the NMP exhaust gas, which can quickly cool the NMP exhaust gas. The water vapor and part of the NMP in the cooled NMP exhaust gas are liquefied and fall directly into the recovery tank 16. The temperature of the coolant increases after absorbing heat and flows out of the recovery tower 1. The increased temperature of the coolant can then be used for preheating in additional production operations, recovering some energy, which is energy-saving and environmentally friendly.

[0040] This efficient NMP-containing waste gas recovery device can be referenced. Figures 1-7 An exemplary working process for NMP exhaust gas before it enters the bottom spray absorption process:

[0041] The device also includes an exhaust gas pump 3 for supplying NMP exhaust gas to the recovery tower 1, a control butterfly valve 4, an exhaust gas inlet pipe 5, a funnel-shaped polymerization frame 6, and a gas polymerization layer 7. The exhaust gas inlet pipe 5 is fixed to the output end of the exhaust gas pump 3. The control butterfly valve 4 is installed on the exhaust gas inlet pipe 5. The exhaust gas inlet pipe 5 is fixed to the recovery tower 1. The funnel-shaped polymerization frame 6 is fixed to the recovery tower 1. The gas polymerization layer 7 is fixed to the funnel-shaped polymerization frame 6. The exhaust gas inlet pipe 5 is connected to the connecting pipe 19. When the control butterfly valve 4 is opened, the exhaust gas pump 3 is started. The NMP exhaust gas enters the recovery tower 1 through the exhaust gas inlet pipe 5. After being absorbed by the high-efficiency heat recovery component 9, the remaining NMP exhaust gas continues to rise. The gas polymerization layer 7 is set as a plate-shaped structure with honeycomb-shaped perforations, which can play a certain role in retaining the rising gas. The NMP exhaust gas is gathered by the funnel-shaped polymerization frame 6 and then gathered by the gas polymerization layer 7, and then continues to rise.

[0042] This efficient NMP-containing waste gas recovery device can be referenced. Figures 6-7An exemplary working process for NMP exhaust gas passing through the first filtration layer:

[0043] The spray absorption assembly 8 includes a circulating spray assembly 10 and a pure water spray assembly 11. The pure water spray assembly 11 is fixed to the recovery tower 1 and is located directly above the gas collection hood 21. The circulating spray assembly 10 is connected to the recovery tank 16, and the upper part of the circulating spray assembly 10 is fixed to the recovery tower 1. The upper part of the circulating spray assembly 10 is located directly above the gas polymerization layer 7. The gas polymerized by the gas polymerization layer 7 passes through the spray of the circulating spray assembly 10, and the spray liquid continuously absorbs NMP. Then, it falls into the recovery tank 16 through the funnel-shaped polymerization frame 6. The circulating spray assembly 10 then extracts the liquid from the recovery tank 16 and sprays it again, realizing continuous absorption of NMP through circulating spray. After the NMP concentration in the solution in the recovery tank 16 reaches the required concentration, the recovery tank 16 is discharged into the treatment chamber 30 for recycling treatment, which can reduce the amount of absorption solution used and save costs.

[0044] This efficient NMP-containing waste gas recovery device can be referenced. Figures 1-7 An exemplary operating procedure for NMP exhaust gas absorption:

[0045] The device also includes a first filter layer 102 located between the collection hood 211 and the upper part of the circulating spray assembly 10. The device also includes a demister layer 12, a demister layer support 13, a drying layer 14, and a tail gas discharge cylinder 15. The demister layer support 13 is fixed to the recovery tower 1, the demister layer 12 is fixed to the demister layer support 13, the drying layer 14 is disposed on the recovery tower 1, and the tail gas discharge cylinder 15 is fixed to the upper end of the recovery tower 1. The device also includes a second filter layer 101 located between the pure water spray assembly 11 and the demister layer support 13. When there is no solution in the recovery tank 16, NMP waste gas is introduced through the waste gas inlet pipe 5. After cooling by the high-efficiency heat recovery assembly 9, a small amount of NMP solution flows into the recovery tank 16. As the gas rises to the collection hood 211, the collection hood 211... 1. Guided NMP gas enters the absorption cone plate 22. The absorption cone plate 22 is sprayed with pure water by the pure water spray assembly 11 connected to the pure water source. The pure water fully absorbs the NMP in the NMP waste gas. Then, it flows down into the first filter layer 102 for filtration and finally flows into the recovery tank 16. Then, the circulating spray assembly 10 is started to use the solution in the recovery tank 16 for circulating spray to absorb NMP. After the cooling liquefaction, circulating spray, pure water spray and gas dispersion steps, the NMP in the NMP waste gas can be fully absorbed. The remaining gas enters the second filter layer 101 to filter out the larger liquid droplets in the remaining waste gas. The remaining tail gas enters the demisting layer support 13 for demisting, and then is dried by the drying layer 14 before being discharged, completing the NMP waste treatment process.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-efficiency recovery device for NMP-containing waste gas, characterized in that: The system includes a recovery tower (1), an inclined high-efficiency absorption assembly (2), a spray absorption assembly (8), a high-efficiency heat recovery assembly (9), a recovery tank (16), and a treatment chamber (30). The inclined high-efficiency absorption assembly (2) is fixed to the recovery tower (1). The spray absorption assembly (8) is installed in the recovery tower (1) and is used to spray and absorb NMP exhaust gas. The high-efficiency heat recovery assembly (9) is fixed to the bottom of the recovery tower (1). The recovery tower (1) is located above the recovery tank (16), which is installed in the recovery tower (1). At the bottom, the processing chamber (30) is connected to the recovery tank (16). The inclined high-efficiency absorption component (2) includes an absorption cone plate (22), a position limiting plate (23), and an exhaust hole group (27). A sliding track (26) is provided on the absorption cone plate (22). Multiple position limiting plates (23) are slidably connected in the sliding track (26). Multiple position limiting plates (23) are fixedly connected to the recovery tower (1). Multiple teeth are provided at the bottom of the absorption cone plate (22). Multiple exhaust hole groups (27) are fixedly connected to the absorption cone plate (22).

2. The high-efficiency recovery device for NMP-containing waste gas according to claim 1, characterized in that: The inclined high-efficiency absorption assembly (2) also includes a gas collection hood (21), a rotating motor (24) and a drive gear (25). The gas collection hood (21) is fixed to the recovery tower (1) and is located directly below the absorption cone plate (22). The rotating motor (24) is fixed to the gas collection hood (21), and the drive gear (25) is fixed to the output shaft of the rotating motor (24). The drive gear (25) meshes with the absorption cone plate (22) for transmission.

3. The high-efficiency recovery device for NMP-containing waste gas according to claim 2, characterized in that: Multiple exhaust hole groups (27) are evenly distributed circumferentially on the absorption cone plate (22), and each exhaust hole group (27) includes multiple through holes arranged in a matrix.

4. The high-efficiency recovery device for NMP-containing waste gas according to claim 2, characterized in that: The gas collection hood (21) includes a collection hood body (211) and support steel rods (212). Multiple support steel rods (212) are fixed to the recovery tower (1), and the collection hood body (211) is set on multiple support steel rods (212).

5. The high-efficiency recovery device for NMP-containing waste gas according to claim 4, characterized in that: The high-efficiency heat recovery component (9) includes a cooling spiral tube (17), a curved exhaust pipe (18), a connecting pipe (19), and a heat exchange pipe (20). The cooling spiral tube (17) is sleeved on the curved exhaust pipe (18). The heat exchange pipe (20) is connected to the cooling spiral tube (17) and installed at the upper end of the curved exhaust pipe (18). The curved exhaust pipe (18) is fixed to the connecting pipe (19). The connecting pipe (19) is fixed to the recovery tower (1). The curved exhaust pipe (18) is provided with multiple rapid cooling holes (181) for discharging NMP exhaust gas. The rapid cooling holes (181) penetrate the curved exhaust pipe (18).

6. The high-efficiency recovery device for NMP-containing waste gas according to claim 5, characterized in that: It also includes an exhaust gas pump (3) for conveying NMP exhaust gas to the recovery tower (1), a control butterfly valve (4), an exhaust gas inlet pipe (5), a funnel-shaped polymerization rack (6) and a gas polymerization layer (7). The exhaust gas inlet pipe (5) is fixed to the output end of the exhaust gas pump (3), the control butterfly valve (4) is installed on the exhaust gas inlet pipe (5), the exhaust gas inlet pipe (5) is fixed to the recovery tower (1), the funnel-shaped polymerization rack (6) is fixed to the recovery tower (1), the gas polymerization layer (7) is fixed to the funnel-shaped polymerization rack (6), and the exhaust gas inlet pipe (5) is connected to the connecting pipe (19).

7. The high-efficiency recovery device for NMP-containing waste gas according to claim 6, characterized in that: The spray absorption assembly (8) includes a circulating spray assembly (10) and a pure water spray assembly (11). The pure water spray assembly (11) is fixed to the recovery tower (1) and is located directly above the gas collection hood (21). The circulating spray assembly (10) is connected to the recovery tank (16). The upper part of the circulating spray assembly (10) is fixed to the recovery tower (1) and is located directly above the gas polymerization layer (7).

8. The high-efficiency recovery device for NMP-containing waste gas according to claim 7, characterized in that: It also includes a first filter layer (102) located between the collection hood (211) and the circulating spray assembly (10).

9. The high-efficiency recovery device for NMP-containing waste gas according to claim 8, characterized in that: It also includes a demister layer (12), a demister layer support (13), a drying layer (14), and an exhaust gas discharge cylinder (15). The demister layer support (13) is fixed to the recovery tower (1), the demister layer (12) is fixed to the demister layer support (13), the drying layer (14) is set on the recovery tower (1), and the exhaust gas discharge cylinder (15) is fixed to the upper end of the recovery tower (1).

10. The high-efficiency recovery device for NMP-containing waste gas according to claim 9, characterized in that: It also includes a second filter layer (101) located between the pure water spray assembly (11) and the demisting layer support (13).

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