A Condensing NMP Recovery Device and Process

Abstract

The present application relates to a condensation NMP recovery device and process, belonging to the technical field of NMP recovery. A condensation NMP recovery device includes an oven, a condensation component and an energy storage component. The oven is provided with a heating chamber; the condensation component includes a gaseous heat exchanger, a first liquid heat exchanger and a demister connected in sequence. The gaseous heat exchanger includes a heat exchange cylinder and a ventilation pipe, and the ventilation pipe is inserted into the heat exchange cylinder. The first liquid heat exchanger includes a first heat exchange tank and a first liquid inlet pipe, and the first liquid inlet pipe is inserted into the heat exchange tank. The waste liquid tank is communicated with the demister; the energy storage component includes a heat exchange pipe and an energy storage water tank with multiple chambers. One end of the energy storage water tank is successively provided with a drain port and a water inlet along the vertical direction downward. One end of the first liquid inlet pipe is communicated with the water inlet, and the other end of the first liquid inlet pipe is communicated with the drain port. The other end of the energy storage water tank is provided with a heat exchange chamber, and the heat exchange pipe is arranged in the heat exchange chamber and is communicated with the heating chamber at one end and the ventilation pipe at the other end. The present application has the effect of energy saving.

Description

Technical Field

[0001] This application relates to the technical field of NMP recovery, and in particular to a condensing NMP recovery device and process. Background Art

[0002] NMP (N-methylpyrrolidone) is a polar solvent with strong selectivity and good stability and an important chemical raw material. It is also a polar aprotic solvent, with advantages such as low viscosity, good stability, high boiling point, strong dissolving power, recyclability, safe use, and suitability for multiple formulation uses. It is widely used in the production of lithium-ion batteries and used as a solvent for the binder PVDF.

[0003] When making the positive and negative electrode materials of lithium batteries and making lithium battery diaphragms, a coater is usually used for production with NMP as the solvent. After NMP is used, it is removed by baking and then discharged as waste liquid, which causes waste of resources and pollution to the environment. The condensing NMP recovery device further recovers the NMP solvent. Mainly after the NMP solvent volatilizes, cold air and condensate are introduced, and heat exchange is carried out with the gaseous substances in the oven in turn, so that NMP returns to the liquid state again, thereby recovering the NMP solvent.

[0004] After condensation, the cold air forms hot air after absorbing heat and is discharged, while the condensate is cooled by a compressor and then exchanges heat with the subsequent gaseous substances again. This method does not make good use of thermal energy and causes great waste of energy. Summary of the Invention

[0005] The purpose of this application is to provide a more energy-saving condensing NMP recovery device and process.

[0006] In the first aspect, a condensing NMP recovery device provided by this application adopts the following technical solution:

[0007] A condensing NMP recovery device includes:

[0008] An oven, which is provided with a heating chamber;

[0009] A condensing component for heat exchange with gaseous substances, including a gaseous heat exchanger, a first liquid heat exchanger, and a demister connected in sequence. The gaseous heat exchanger includes a heat exchange cylinder and a ventilation pipe. The ventilation pipe is inserted into the heat exchange cylinder for introducing cooling gas into the heat exchange cylinder. The first liquid heat exchanger includes a first heat exchange box and a first liquid inlet pipe. The first liquid inlet pipe is inserted into the heat exchange box for introducing cooling liquid into the heat exchange box;

[0010] A waste liquid tank, which is connected to the demister for collecting the liquid substances formed after the condensation of gaseous substances;

[0011] An energy storage component includes a heat exchange tube and an energy storage water tank with multiple chambers, one end of the energy storage water tank is provided with a drain port and a water inlet in sequence vertically downward, one end of the first liquid inlet pipe is connected to the water inlet, and the other end of the first liquid inlet pipe is connected to the drain port, and the other end of the energy storage water tank is provided with a heat exchange cavity, the heat exchange tube is arranged in the heat exchange cavity, and one end of the heat exchange tube is connected to the heating cavity, and the other end is connected to the ventilation pipe.

[0012] By adopting the above technical scheme, after the gaseous substance passes through the gas heat exchanger and the first liquid heat exchanger in sequence for heat exchange, the cooling liquid flows out from the first heat exchange box and enters the energy storage tank for energy storage, forming a high-heat liquid distributed on one side of the heat exchange chamber and a low-heat liquid distributed on the side away from the heat exchange chamber. After the high-heat liquid exchanges heat with the cooling gas after heat exchange, it is introduced into the heating chamber to maintain the temperature stability in the oven, while the low-heat liquid is introduced back into the first heat exchange box to exchange heat with the subsequent gaseous substance. By accumulating the heat energy absorbed by the cooling liquid and transferring it to the cooling gas after heat exchange, the energy required to maintain the temperature of the oven and the cooling liquid is reduced, which is more energy-saving.

[0013] Optionally, a return water pipe is further included, and the energy storage water tank is provided with a first return water port and a second return water port at the bottom end on one side of the heat exchange chamber, and the return water pipe is respectively connected to the first return water port and the second return water port.

[0014] By adopting the above technical solution, the high-temperature liquid enters the return pipe from the first return water port and re-enters the energy storage tank through the second return water port, so that the high-temperature liquid continues to store energy on one side of the heat exchange chamber, which can enhance the heat absorption efficiency of the heat exchange tube to ensure the stability of the temperature in the oven.

[0015] Optionally, the heat exchange tube is arranged in an S-shaped direction in the heat exchange cavity.

[0016] By adopting the above technical solution and arranging the heat exchange tube in an S shape, the flow time of the cooling gas after heat exchange with the gaseous substance in the heat exchange tube is increased, thereby further improving the heat absorption efficiency of the cooling gas.

[0017] Optionally, a second liquid heat exchanger is connected between the first liquid heat exchanger and the defogger, and the second liquid heat exchanger includes a second heat exchange box and a second liquid inlet pipe, and the second liquid inlet pipe is inserted into the second heat exchange box for supplying chilled water to the second heat exchange box.

[0018] After the gaseous substance passes through the gaseous heat exchanger and the first liquid heat exchanger in sequence, most of the heat possessed by the gaseous substance has been absorbed, and there is still a part of the gaseous substance that has not been converted into liquid. By adopting the above technical solution, the chilled water in the second liquid heat exchanger can further cool the gaseous substance, thereby improving the efficiency of converting the gaseous substance into a liquid substance.

[0019] Optionally, a plurality of the ovens and the condensation assemblies are provided, and the plurality of ovens are arranged in one-to-one correspondence with the plurality of condensation assemblies.

[0020] By adopting the above technical solution, by arranging multiple groups of ovens and condensation assemblies, more gaseous substances can be processed, and the processing efficiency is higher.

[0021] Optionally, it further includes a tail gas treatment assembly. The tail gas treatment assembly is communicated with the condensation assembly and includes a tail gas treatment tower and a pure water tank. The tail gas treatment tower is sequentially provided with a discharge port, a first feed port, a second feed port, and an exhaust port along the vertically upward direction;

[0022] The second feed port is communicated with the pure water tank for introducing pure water into the tail gas treatment tower. The discharge port is respectively communicated with a plurality of the gaseous heat exchangers for introducing part of the gaseous substance into the tail gas treatment tower. The waste liquid tank is communicated with the discharge port.

[0023] By adopting the above technical solution, the tail gas treatment tower and the rectification assembly can process the gaseous substance synchronously, and a liquid substance is obtained after rectification in the tail gas treatment tower.

[0024] Optionally, exhaust fans are provided between the oven and the gaseous heat exchanger, and between the gaseous heat exchanger and the tail gas treatment tower.

[0025] By adopting the above technical solution, by arranging the exhaust fans between the oven and the gaseous heat exchanger, and between the gaseous heat exchanger and the tail gas treatment tower, the stability of the flow rate of the gaseous substance is ensured, and the condensation recovery efficiency is ensured.

[0026] In a second aspect, a condensation NMP recovery process provided by the present application adopts the following technical solution:

[0027] S1. Introduce the gaseous substance in the oven into the gaseous heat exchanger to perform heat exchange with the cooling gas in the ventilation pipe for preliminary cooling;

[0028] S2. Further introduce the gaseous substance processed by the gaseous heat exchanger into the first liquid heat exchanger and the demister in sequence, so that the liquid substance formed after condensation enters the waste liquid tank for condensation recovery, and the gaseous part is re-introduced into the gaseous heat exchanger;

[0029] S3. Introduce the cooling liquid after heat exchange with the gaseous substance into the water inlet, so that the cooling liquid stores energy in the energy storage water tank, forming a high-temperature liquid distributed on one side of the heat exchange cavity and a low-temperature liquid distributed on the side away from the heat exchange cavity, and reintroduce the low-temperature liquid back into the first heat exchange box;

[0030] S4. Pass the cooling gas after heat exchange with the gaseous substance through the heat exchange tube into the heat exchange cavity, and after heat exchange with the high-temperature liquid, introduce it into the heating cavity to maintain the stability of the temperature in the oven.

[0031] By adopting the above technical solution, the heat absorbed by the cooling gas and the cooling liquid from the gaseous substance is utilized, and the heat of the cooling liquid is further transferred to the cooling gas, so that the cooling gas has a higher temperature, and then it is introduced into the heating cavity to maintain the stability of the temperature in the oven, while the cooling liquid cools down and reflows back to the first heat exchange box to absorb heat, effectively utilizing the thermal energy of the gaseous substance when recovering NMP.

[0032] Optionally, before the low-temperature liquid is reintroduced back into the first heat exchange box, the low-temperature liquid is cooled down to re-form the cooling liquid.

[0033] By adopting the above technical solution, compared with the method of directly cooling the low-temperature liquid, it can reduce energy consumption while ensuring the heat absorption efficiency of the cooling liquid in the first heat exchange box.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. When the gaseous substance sequentially passes through the gaseous heat exchanger and the first liquid heat exchanger for heat exchange, the cooling liquid flows out of the first heat exchange box and enters the energy storage water tank for energy storage, forming a high-temperature liquid distributed on one side of the heat exchange cavity and a low-temperature liquid distributed on the side away from the heat exchange cavity. After the high-temperature liquid exchanges heat with the cooled cooling gas, the cooling gas is then introduced into the heating cavity to maintain the stability of the temperature in the oven, while the low-temperature liquid is reintroduced back into the first heat exchange box to exchange heat with the subsequent gaseous substance. By accumulating and transferring the thermal energy absorbed by the cooling liquid to the cooled cooling gas, the energy required to maintain the temperature of the oven and the cooling liquid is reduced, making it more energy-efficient.

[0036] 2. The high-temperature liquid enters the return pipe from the first water return port and re-enters the energy storage water tank through the second water return port, so that the high-temperature liquid continuously stores energy on one side of the heat exchange cavity, which can enhance the heat absorption efficiency of the heat exchange tube to ensure the stability of the temperature in the oven.

[0037] 3. By arranging the heat exchange tube in an S shape, the flow time of the cooling gas after heat exchange with the gaseous substance in the heat exchange tube is increased, further improving the heat absorption efficiency of the cooling gas. Description of the Drawings

[0038] Figure 1 It is a schematic flow diagram of a condensation NMP recovery device in this application;

[0039] Figure 2 It is a schematic cross-sectional structure diagram of the energy storage water tank in this application;

[0040] Figure 3 It is a schematic plan view of the heat exchange tube in this application.

[0041] In the figure, 1 is an oven; 11 is a heating chamber; 2 is a condensation assembly; 21 is a gaseous heat exchanger; 211 is a heat exchange cylinder; 212 is a ventilation pipe; 22 is a first liquid heat exchanger; 221 is a first heat exchange box; 222 is a first liquid inlet pipe; 23 is a demister; 24 is a second liquid heat exchanger; 241 is a second heat exchange box; 242 is a second liquid inlet pipe; 3 is a waste liquid tank; 4 is an energy storage assembly; 41 is a heat exchange tube; 42 is an energy storage water tank; 421 is a chamber; 422 is a drain port; 423 is a water inlet; 424 is a heat exchange chamber; 425 is a first water return port; 426 is a second water return port; 43 is a water return pipe; 5 is a tail gas treatment assembly; 51 is a tail gas treatment tower; 511 is a discharge port; 512 is a first feed port; 513 is a second feed port; 514 is an exhaust port; 52 is a pure water tank; 6 is an exhaust fan; 7 is a circulation pump; 8 is a concentration meter. Specific embodiments

[0042] The following will further describe this application in detail with reference to the attached Figure 1 - attached Figure 3 drawings.

[0043] A condensation NMP recovery device, referring to Figure 1 and Figure 2 , includes an oven 1 and a condensation assembly 2. Among them, multiple ovens 1 and condensation assemblies 2 are provided. In this embodiment, both the oven 1 and the condensation assembly 2 are provided with two. The two ovens 1 and the two condensation assemblies 2 are arranged in one-to-one correspondence. The NMP solvent is baked in the oven 1 to form a gaseous substance, and the gaseous substance is further introduced into the condensation assembly 2 for condensation treatment, so as to be converted from a gaseous substance into a liquid substance and recovered.

[0044] Referring to Figure 1 , the condensation assembly 2 includes a gaseous heat exchanger 21, a first liquid heat exchanger 22 and a demister 23 that are connected in sequence. Among them, an exhaust fan 6 is arranged between the gaseous heat exchanger 21 and the oven 1 to introduce the gaseous substance from the oven 1 into the condensation assembly 2. When the gaseous substance enters the condensation assembly 2, it exchanges heat with the gaseous heat exchanger 21 and the first liquid heat exchanger 22 in sequence, and then part of it is converted into a liquid substance in the demister 23, while the rest remains in a gaseous state and forms a mist.

[0045] The demister 23 further processes the mist-like mixture to separate the liquid matter from the gaseous matter. The gaseous matter is re-introduced into the gaseous heat exchanger 21 for heat exchange treatment, while the liquid matter is collected. Correspondingly, a waste liquid tank 3 is also included, and the waste liquid tank 3 is connected to the two demisters 23 through pipelines.

[0046] Refer to Figure 1 , the gaseous heat exchanger 21 includes a heat exchange cylinder 211 and a ventilation pipe 212. The ventilation pipe 212 is inserted into the heat exchange cylinder 211 for introducing a cooling gas into the heat exchange cylinder 211. The first liquid heat exchanger 22 includes a first heat exchange tank 221 and a first liquid inlet pipe 222. The first liquid inlet pipe 222 is inserted into the heat exchange tank for introducing a cooling liquid into the heat exchange tank. In this embodiment, the cooling gas is air, and the cooling liquid is cooling water, thereby reducing the use cost of the device.

[0047] Further, a heating cavity 11 is provided in the oven 1. The recovery device further includes an energy storage component 4. In this embodiment, the energy storage component 4 is provided in two groups, corresponding to the two condensation components 2 respectively. In other embodiments, the energy storage component 4 can also be provided in only one group and connected to the two condensation components 2 respectively. The energy storage component 4 can collect the heat absorbed by the cooling liquid and the cooling gas and act on the oven.

[0048] Specifically, refer to Figure 1 and Figure 2 , the energy storage component 4 includes a heat exchange pipe 41 and an energy storage water tank 42 with a plurality of chambers 421. The plurality of chambers 421 are arranged and communicated in sequence along the length direction of the energy storage water tank 42. One end of the energy storage water tank 42 is successively provided with a drain port 422 and a water inlet port 423 along the vertical downward direction. One end of the first liquid inlet pipe 222 is communicated with the water inlet port 423, and the other end of the first liquid inlet pipe 222 is communicated with the drain port 422. The other end of the energy storage water tank 42 is provided with a heat exchange cavity 424. The heat exchange pipe 41 is arranged in the heat exchange cavity 424 and is communicated with the heating cavity 11 at one end and the ventilation pipe 212 at the other end.

[0049] After the gaseous matter passes through the gaseous heat exchanger 21 and the first liquid heat exchanger 22 for heat exchange in sequence, the cooling liquid flows out from the first heat exchange tank 221 and enters the energy storage water tank 42 for energy storage, forming a high-temperature liquid distributed on one side of the heat exchange cavity 424 and a low-temperature liquid distributed on the side away from the heat exchange cavity 424. After the high-temperature liquid exchanges heat with the cooled cooling gas, the temperature decreases, while the cooling gas heats up and is introduced into the heating cavity 11, thereby maintaining the temperature stability in the oven 1.

[0050] Further, the low-temperature liquid is re-introduced into the first heat exchange tank 221. It has a lower temperature compared to before being introduced into the energy storage water tank 42. It exchanges heat with the gaseous substance subsequently introduced into the first heat exchange tank 221. Through the energy storage water tank 42, the heat of the cooled liquid after heat exchange is accumulated, and through the heat exchange cavity 424, the accumulated heat is further transferred to the cooled gas after heat exchange, so as to reduce the power of the oven 1 and the energy consumption required to cool the cooling liquid.

[0051] It should be noted that in this embodiment, a refrigerating component (not shown in the figure) is provided on the first liquid inlet pipe 222, which mainly includes refrigerating components such as a compressor, an evaporator, a condenser, and an expansion valve. In this embodiment, before the cooling liquid re-enters the first heat exchange tank 221 from the energy storage water tank 42, the refrigerating component is started to cool the cooling liquid. Compared with the case where the energy storage water tank 42 is not provided, the same cooling effect can be achieved with a lower power.

[0052] Further, referring to Figure 1 and Figure 2 , a return water pipe 43 is provided on the energy storage water tank 42, and a first return water port 425 and a second return water port 426 are opened at the bottom end of the side of the energy storage water tank 42 where the heat exchange cavity 424 is provided. The return water pipe 43 is respectively communicated with the first return water port 425 and the second return water port 426. When heat continuously accumulates on the side of the energy storage water tank 42 with the heat exchange cavity 424, the high-temperature liquid flows out of the energy storage water tank 42 from the first return water port 425 and re-enters the energy storage water tank 42 through the second return water port 426, so that the high-temperature liquid continuously stores energy and enhances the heat absorption efficiency of the heat exchange tube 41.

[0053] In addition, in combination with Figure 3 , the heat exchange tube 41 is arranged in an S-shaped trend in the heat exchange cavity 424, so that the flow time of the cooled gas in the heat exchange cavity 424 is increased, and it continuously exchanges heat with the high-temperature liquid.

[0054] Further, referring to Figure 1 , a second liquid heat exchanger 24 is connected between the first liquid heat exchanger 22 and the demister 23. The second liquid heat exchanger 24 includes a second heat exchange tank 241 and a second liquid inlet pipe 242. The second liquid inlet pipe 242 is inserted into the second heat exchange tank 241 for introducing chilled water into the second heat exchange tank 241.

[0055] When the gaseous substance passes through the gaseous heat exchanger 21 and the first liquid heat exchanger 22 in sequence, most of the heat possessed by the gaseous substance has been absorbed, and there is still a part of the gaseous substance that has not been converted into a liquid state. The chilled water in the second liquid heat exchanger 24 can further cool the gaseous substance, thereby improving the efficiency of converting the gaseous substance into a liquid substance.

[0056] Referring to Figure 1, further comprising an exhaust gas treatment component 5, the exhaust gas treatment component 5 being in communication with the condensation component 2, comprising an exhaust gas treatment tower 51 and a pure water tank 52, the exhaust gas treatment tower 51 being provided with a discharge port 511, a first feed port 512, a second feed port 513 and an exhaust port 514 in sequence in a vertically upward direction;

[0057] Among them, the exhaust port 514 is used for exhausting gas to discharge a part of the filtered gaseous matter from the exhaust gas treatment tower 51, the second feed port 513 is connected with the pure water tank 52, and a pure water pump is arranged between the second feed port 513 and the pure water tank 52 to introduce pure water into the exhaust gas treatment tower 51, and the discharge port 511 is respectively connected with two gas heat exchangers 21, and an exhaust fan 6 is arranged between the gas heat exchanger 21 and the exhaust gas treatment tower 51 to introduce part of the gaseous matter into the exhaust gas treatment tower 51. Furthermore, the waste liquid tank 3 is connected with the discharge port 511. After the liquid is deposited at the bottom of the exhaust gas treatment tower 51, it can flow out from the discharge port 511 and enter the waste liquid tank 3, while the exhaust port 514 is for.

[0058] In addition, a circulation pump 7 is provided outside the tail gas treatment tower 51, and the circulation pump 7 is used to extract the liquid in the tail gas treatment tower 51. Furthermore, a concentration meter 8 is provided between the circulation pump 7 and the tail gas treatment tower 51, and the concentration meter 8 is used to measure the NMP content of the liquid in the tail gas treatment tower 51. When the circulation pump 7 is started, part of the liquid flows through the concentration meter 8, so as to understand the NMP content in the liquid at the bottom of the tail gas treatment tower 51. When the liquid concentration reaches the standard, the liquid is extracted and enters the waste liquid tank 3.

[0059] The implementation principle of the embodiment of the present application is as follows: after the gaseous substance passes through the gas heat exchanger 21 and the first liquid heat exchanger 22 in sequence for heat exchange, the cooling liquid flows out from the first heat exchange box 221 and enters the energy storage tank 42 for energy storage, forming a high-heat liquid distributed on one side of the heat exchange chamber 424 and a low-heat liquid distributed on the side away from the heat exchange chamber 424. After the high-heat liquid exchanges heat with the cooling gas after heat exchange, the cooling gas is subsequently introduced into the heating chamber 11, thereby maintaining the temperature stability in the oven 1, and the low-heat liquid is re-introduced back into the first heat exchange box 221 to exchange heat with the subsequent gaseous substance. By accumulating the heat energy absorbed by the cooling liquid and transferring it to the cooling gas after heat exchange, the energy required to maintain the temperature of the oven 1 and the cooling liquid is reduced, which is more energy-efficient.

[0060] In addition, this embodiment also discloses a recovery process based on the above-mentioned condensed NMP recovery device, comprising the following steps:

[0061] S1, passing the gaseous material in the oven 1 into the gas heat exchanger 21, and exchanging heat with the cooling gas in the ventilation pipe 212 to perform preliminary cooling;

[0062] S2, the gaseous matter treated by the gaseous heat exchanger 21 is further sequentially fed into the first liquid heat exchanger 22 and the demister 23, so that the liquid matter formed after condensation enters the waste liquid tank 3 for condensation recovery, and the gaseous part is re-inputted back into the gaseous heat exchanger 21;

[0063] S3, passing the cooling liquid after heat exchange with the gaseous substance into the water inlet 423, so that the cooling liquid is stored in the energy storage tank 42, forming a high-heat liquid distributed on one side of the heat exchange cavity 424 and a low-heat liquid distributed on the side away from the heat exchange cavity 424, and the low-heat liquid is passed back into the first heat exchange box 221;

[0064] S4. The cooling gas after heat exchange with the gaseous substance is introduced into the heat exchange chamber 424 through the heat exchange tube 41, and then introduced into the heating chamber 11 after heat exchange with the high-temperature liquid to maintain the temperature in the oven 1 stable.

[0065] Before the low-heat liquid is passed back into the first heat exchange box 221, the low-heat liquid is cooled to form cooling liquid again.

[0066] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A condensed NMP recovery device, characterized in that, include: The oven (1) is provided with a heating chamber (11); A condensation assembly (2) for exchanging heat with a gaseous substance, comprising a gaseous heat exchanger (21), a first liquid heat exchanger (22), and a demister (23) which are connected in sequence, wherein the gaseous heat exchanger (21) comprises a heat exchange cylinder (211) and a vent pipe (212), wherein the vent pipe (212) is inserted into the heat exchange cylinder (211) and is used to pass cooling gas into the heat exchange cylinder (211), and the first liquid heat exchanger (22) comprises a first heat exchange box (221) and a first liquid inlet pipe (222), wherein the first liquid inlet pipe (222) is inserted into the heat exchange box and is used to pass cooling liquid into the heat exchange box; A waste liquid tank (3), connected to the demister (23), for collecting liquid substances formed by condensation of gaseous substances; An energy storage component (4), comprising a heat exchange tube (41) and an energy storage water tank (42) having a plurality of chambers (421); one end of the energy storage water tank (42) is provided with a drain port (422) and a water inlet (423) in sequence vertically downward; one end of the first liquid inlet tube (222) is connected to the water inlet (423); the other end of the first liquid inlet tube (222) is connected to the drain port (422); the other end of the energy storage water tank (42) is provided with a heat exchange chamber (424); the heat exchange tube (41) is arranged in the heat exchange chamber (424); one end of the heat exchange tube (41) is connected to the heating chamber (11); and the other end of the heat exchange tube (41) is connected to the ventilation tube (212); The cooling liquid after heat exchange with the gaseous substance is introduced into the water inlet (423), so that the cooling liquid is stored in the energy storage tank (42), forming a high-heat liquid distributed on one side of the heat exchange chamber (424) and a low-heat liquid distributed on the side away from the heat exchange chamber (424), and the low-heat liquid is introduced back into the first heat exchange box (221); The heat exchange chamber (424) is provided on one side of the energy storage water tank (42), and a first return water port (425) and a second return water port (426) are provided at the bottom end thereof. The return water pipe (43) is connected to the first return water port (425) and the second return water port (426) respectively. High-temperature liquid enters the return water pipe (43) from the first return water port (425) and re-enters the energy storage water tank (42) through the second return water port (426).

2. A condensed NMP recovery device according to claim 1, characterized in that, The heat exchange tube (41) is arranged in an S-shaped direction in the heat exchange cavity (424).

3. A condensed NMP recovery device according to claim 1, characterized in that, A second liquid heat exchanger (24) is connected between the first liquid heat exchanger (22) and the defogger (23), and the second liquid heat exchanger (24) includes a second heat exchange box (241) and a second liquid inlet pipe (242). The second liquid inlet pipe (242) is inserted into the second heat exchange box (241) and is used to introduce chilled water into the second heat exchange box (241).

4. A condensed NMP recovery device according to claim 3, characterized in that, The oven (1) and the condensation assembly (2) are provided in plurality, and the plurality of ovens (1) and the plurality of condensation assemblies (2) are provided in a one-to-one correspondence.

5. A condensed NMP recovery device according to claim 1, characterized in that, The exhaust gas treatment component (5) is also included. The exhaust gas treatment component (5) is in communication with the condensation component (2), and includes an exhaust gas treatment tower (51) and a pure water tank (52). The exhaust gas treatment tower (51) is provided with a discharge port (511), a first feed port (512), a second feed port (513), and an exhaust port (514) in sequence in a vertically upward direction. The second feed port (513) is connected to the pure water tank (52) for introducing pure water into the tail gas treatment tower (51); the first feed port (512) is respectively connected to a plurality of the gaseous heat exchangers (21) for introducing part of the gaseous matter into the tail gas treatment tower (51); the waste liquid tank (3) is connected to the discharge port (511).

6. A condensed NMP recovery device according to claim 5, characterized in that, An exhaust fan (6) is provided between the oven (1) and the gas heat exchanger (21), and between the gas heat exchanger (21) and the tail gas treatment tower (51).

7. A condensed NMP recovery process, based on the condensed NMP recovery device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, passing the gaseous material in the oven (1) into the gas heat exchanger (21), exchanging heat with the cooling gas in the ventilation pipe (212) to perform preliminary cooling; S2, the gaseous matter treated by the gaseous heat exchanger (21) is further sequentially fed into the first liquid heat exchanger (22) and the demister (23), and the liquid matter formed after condensation is fed into the waste liquid tank (3) for condensation recovery, while the gaseous part is re-input into the gaseous heat exchanger (21); S3. The cooling gas after heat exchange with the gaseous substance is introduced into the heat exchange chamber (424) through the heat exchange tube (41), and then introduced into the heating chamber (11) after heat exchange with the high-temperature liquid, so as to maintain the temperature in the oven (1) stable.

8. A condensed NMP recovery process according to claim 7, characterized in that, Before the low-heat liquid is passed back into the first heat exchange box (221), the low-heat liquid is cooled to form cooling liquid again.

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