CN219209457U

CN219209457U - NMP recovery system and lithium battery coating system based on same

Info

Publication number: CN219209457U
Application number: CN202320878593.6U
Authority: CN
Inventors: 徐先华; 程星华; 宋宣; 刘书倾; 李雅萱
Original assignee: China Electronics Engineering Design Institute Co Ltd
Current assignee: China Electronics Engineering Design Institute Co Ltd
Priority date: 2023-04-19
Filing date: 2023-04-19
Publication date: 2023-06-20
Anticipated expiration: 2033-04-19

Abstract

The utility model relates to an NMP recycling system and a lithium battery coating system based on the system. The NMP recovery system comprises: the device comprises a coating and drying device, a heat exchange device, an adsorption and desorption device and a heat pump device; the coating and drying device is connected with the heat exchange device through a gas pipeline to be separated and a reflux gas pipeline, and the heat exchange device, the adsorption and desorption device and the heat pump device are sequentially connected into a closed loop. By adopting the NMP recovery system and the lithium battery coating system provided by the utility model, NMP in the system can be effectively recovered, and the heat recovery efficiency of the system can be effectively improved.

Description

NMP recovery system and lithium battery coating system based on same

Technical Field

The utility model belongs to the technical field of resource recycling, and particularly relates to an NMP (N-methyl pyrrolidone) recycling system and a lithium battery coating system based on the NMP recycling system.

Background

In the process of working a positive electrode coating machine in the production of lithium ion batteries, a layer of polymer needs to be coated on a positive electrode material of the battery, the polymer material needs to be coated on the surface of an electrode sheet material after being dissolved by an organic solvent, and then the polymer material is dried to separate the organic solvent from the positive electrode sheet, and N-methyl pyrrolidone (NMP) is widely used as the organic solvent.

During the drying process, if it is not recovered, NMP will become gas to be discharged to the air, which will cause a great consumption of NMP solvent. Because NMP is expensive, the cost control of manufacturers is greatly damaged, and volatile organic compounds are polluted, so that the environmental protection emission requirement cannot be met. In addition, the drying waste gas exhausted by the coating machine has higher temperature, and direct discharge is also a huge waste of energy, so NMP recovery and heat recovery are important links in the production process of lithium ion batteries.

Existing NMP recovery units are typically treated as follows: firstly, carrying out heat exchange on high-temperature waste gas (the temperature is usually 100-130 ℃) containing NMP through a heat exchanger to obtain primary cooling gas (the temperature is usually reduced to 50-70 ℃); then, cooling the preliminary cooling gas by adopting a primary surface cooler, wherein the temperature of the preliminary cooling gas is reduced to below 40 ℃, and part of NMP in the preliminary cooling gas is separated out to obtain primary surface cooling gas; then, introducing the primary surface cold air into a secondary surface cooler for deep cooling to obtain secondary surface cold air, wherein the temperature of the secondary surface cold air is 15-20 ℃, and NMP is further separated out in the process of deep cooling; and finally, introducing about 90vol% of secondary surface cooling air into a heat exchanger for heat exchange and temperature rise (the temperature after temperature rise can reach 60-70 ℃), and sending the heated air back to the coating machine, and heating the air to the process temperature by a heating device of the coating machine for recycling. About 10vol% of the secondary cold air is input into the rotating wheel for treatment, the treatment is carried out to obtain exhaust gas, the concentration of NMP in the exhaust gas is reduced to 20-30 ppm, and the concentration can meet the emission standard of organic waste gas.

However, the rotating wheel needs to be subjected to desorption treatment, and large electric energy or heat energy is consumed during desorption, so that the energy consumption of the whole NMP recovery device is high.

For example, patent CN215996142U discloses an exhaust gas treatment system for NMP recovery, the system includes a coater oven, a heat recoverer, a VOC runner, a first heat exchanger, a second heat exchanger, a storage tank and a filter, the heat source outlet of the second heat exchanger is connected with the cold source inlet of the third heat exchanger, the cold source outlet of the third heat exchanger is connected with a circulating fan, the output end of the circulating fan is connected with the treatment area of the VOC runner, the output end of the circulating fan is connected to the cold source inlet of the heat recoverer, the cold source inlet and the cold source outlet of the first heat exchanger are respectively connected with a cooling water inlet pipe and a cooling water outlet pipe, the cold source inlet and the cold source outlet of the second heat exchanger are respectively connected with a chilled water inlet pipe and a chilled water outlet pipe, and the heat source inlet and the heat source outlet of the third heat exchanger are both connected to the cooling water outlet pipe. According to the system, the third heat exchanger is added to heat the NMP, so that condensation generated in a pipeline and a fan due to low air flow temperature is avoided, the efficiency of removing NMP by the VOC rotating wheel is improved, and the technical problem of high energy consumption of the VOC rotating wheel is not solved.

Accordingly, it is desirable to provide an NMP recovery system that improves the heat recovery capacity of the NMP recovery system in the event that NMP emission standards are met.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide an NMP (N-methyl pyrrolidone) recovery system and a lithium battery coating system based on the NMP recovery system, which can effectively recover NMP in the NMP recovery system and the lithium battery coating system and can effectively improve the heat recovery efficiency of the system.

The first aspect of the present utility model provides an NMP recovery system comprising: the device comprises a coating and drying device, a heat exchange device, an adsorption and desorption device and a heat pump device; the coating and drying device is connected with the heat exchange device through a gas pipeline to be separated and a reflux gas pipeline, and the heat exchange device, the adsorption and desorption device and the heat pump device are sequentially connected into a closed loop; be provided with feed back mouth, heat transfer material export and heat transfer NMP recovery pipeline on the heat transfer device, be provided with on the absorption and desorption device and inhale desorption gas entry, outer exhaust body pipeline and desorption gas export, inhale and inhale desorption gas entry with heat transfer material exit linkage, be provided with heat pump entry, heat pump export and first NMP recovery pipeline on the heat pump device, the heat pump entry with desorption gas exit linkage, the heat pump export with the feed back mouth is connected.

As a preferred technical solution, the heat exchange device includes: the first heat exchange device has: the heat source inlet is connected to the gas pipeline to be separated, the cold source outlet is connected to the reflux gas pipeline, and the cold source inlet is connected to the feed back port; and a primary surface cooler having: a first inlet and a first outlet, the first inlet being connected to the heat source outlet; a secondary surface cooler includes: the second inlet is connected with the first outlet, and the second outlet is connected with the cold source inlet and the heat exchange material outlet.

As a preferable technical scheme, the heat exchange NMP recovery pipeline comprises a second NMP recovery pipeline and a third NMP recovery pipeline, wherein the second NMP recovery pipeline is arranged on the primary surface cooler, and the third NMP recovery pipeline is arranged on the secondary surface cooler.

As a preferred technical scheme, the heat pump device comprises a heat pump evaporator and a heat pump condenser which are sequentially connected, wherein the heat pump inlet is arranged on the heat pump evaporator, the heat pump outlet is arranged on the heat pump condenser, and a first NMP recovery pipeline is arranged on the heat pump evaporator.

As a preferable technical scheme, the adsorption and desorption device comprises a rotating wheel adsorption assembly, a rotating wheel cooling assembly and a rotating wheel desorption assembly; the rotating wheel adsorption assembly is provided with an adsorption and desorption gas inlet and an adsorption gas outlet, and the adsorption gas outlet is connected with the external exhaust gas pipeline;

be provided with cooling inlet and cooling outlet on the runner cooling module, cooling inlet with adsorb gas outlet connection, be provided with desorption gas inlet and desorption gas outlet on the runner desorption subassembly, desorption gas inlet with cooling outlet connection.

As a preferable technical scheme, the NMP recovery system further comprises a regeneration heating device, and the regeneration heating device is respectively connected with the cooling outlet and the desorption gas inlet.

As a preferred technical scheme, the NMP recovery system further comprises a coater oven supplemental heater, wherein the coater oven supplemental heater comprises a heater inlet and a heater outlet, the heater inlet is connected with the cold source outlet, and the heater outlet is connected with the coating and drying device; the NMP recovery system further comprises a coater oven circulating fan which is arranged on the reflux air pipeline, and one end of the NMP recovery system is connected with the inlet of the heater.

As a preferred technical scheme, the NMP recovery system further comprises an NMP recovery storage tank, and the first NMP recovery pipeline and the heat exchange NMP recovery pipeline are both connected with the NMP recovery storage tank.

As a preferred embodiment, the NMP recovery system further includes: the first fan assembly is arranged on the air pipeline to be separated; the second fan assembly is connected with the second outlet, the cold source inlet and the adsorption and desorption gas inlet; a third fan assembly connected to the adsorption gas outlet, the external exhaust gas line, and the cooling inlet; the fourth fan assembly is connected with the desorption gas outlet and the heat pump inlet; and the fifth fan assembly is arranged on the reflux air pipeline, and one end of the fifth fan assembly is connected with the cold source outlet.

In a second aspect, the present utility model provides a lithium battery coating system comprising the above NMP recovery system.

Compared with the prior art, the NMP recovery system and the lithium battery coating system based on the NMP recovery system provided by the utility model have the following beneficial effects:

(1) According to the utility model, the heat pump device is connected behind the desorption gas outlet of the adsorption and desorption device, and the evaporator of the heat pump device can further perform condensation treatment on the desorption gas, so that NMP products can be further separated, and the recovery rate of NMP is improved.

(2) The heat pump evaporator introduces the NMP-removed gas into the heat pump condenser for heating treatment, the heated gas is discharged through the heat pump condenser and is sent into the feed back port, and the gas discharged from the second outlet is mixed to form mixed gas, wherein the temperature of the mixed gas is 25-30 ℃ (the temperature of the gas sent into the cold source inlet in the prior art is 15-20 ℃).

(3) The mixed gas enters the first heat exchange device through the cold source inlet, and is discharged from the cold source outlet after heat exchange, so that return gas is obtained, the temperature of the discharged gas is increased to 70-80 ℃ compared with the temperature of 60-70 ℃ in the prior art, the energy consumption of a supplementary heater of a coating machine oven is reduced, and direct economic benefit is brought to lithium battery manufacturers.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

FIG. 1 is a block diagram of an NMP recovery system in an embodiment of the utility model.

FIG. 2 is a schematic diagram of an apparatus for an NMP recovery system according to an embodiment of the utility model.

Reference numerals illustrate:

100-coating and drying device; 101-a gas line to be separated; 102-a return gas line; 200-a heat exchange device; 201-a feed back port; 202-a heat exchange material outlet; 210-a first heat exchange device; 211-a heat source inlet; 212-a heat source outlet; 213-cold source inlet; 214-a cold source outlet; 220-a primary surface cooler; 221-a first inlet; 222-a first outlet; 230-a secondary surface cooler; 231-a second inlet; 232-a second outlet; 300-an adsorption and desorption device; 301-an adsorption and desorption gas inlet; 302-a desorption gas outlet; 310-a rotor adsorption assembly; 320-a rotor cooling assembly; 330-a rotor desorption assembly; 312-adsorption gas outlet; 321-cooling inlet; 322-cooling outlet; 331-a desorption gas inlet; 340-a regenerative heating device; 500-a heat pump device; 501-a heat pump inlet; 502-a heat pump outlet; 510-a heat pump evaporator; 520-heat pump condenser; 600-a coater oven supplemental heater; 610-heater inlet; 620-heater outlet; 701-a coater oven circulating fan; 702-a first fan assembly; 703-second fan assembly, 704-third fan assembly, 705-fourth fan assembly, 706-fifth fan assembly, 800-NMP recovery tank.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such element.

Alternative embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the present utility model provides an NMP recovery system comprising: a coating and drying device 100, a heat exchange device 200, an adsorption and desorption device 300 and a heat pump device 500; the coating and drying device 100 is connected with the heat exchange device 200 through a gas pipeline 101 to be separated and a reflux gas pipeline 102, and the heat exchange device 200, the adsorption and desorption device 300 and the heat pump device 500 are sequentially connected into a closed loop; be provided with feed back mouth 201, heat transfer material export 202 and heat transfer NMP recovery pipeline on the heat transfer device 200, be provided with on the absorption and desorption device 300 and inhale desorption gas entry 301, outer exhaust body pipeline and desorption gas export 302, inhale desorption gas entry 301 and heat transfer material export 202 are connected, be provided with heat pump entry 501, heat pump export 502 and first NMP recovery pipeline on the heat pump device 500, heat pump entry 501 is connected with desorption gas export 302, heat pump export 502 is connected with feed back mouth 201.

Through introducing heat pump device in this NMP recovery system, can promote the rate of recovery of NMP in the NMP recovery system, can effectually utilize the heat in the NMP recovery system again.

In the present utility model, specific devices in the heat exchange device 200 can be assembled according to the requirements of working conditions. In the embodiment provided by the present utility model, preferably, the heat exchange device 200 includes: the first heat exchange device 210 includes: a heat source inlet 211, a heat source outlet 212, a cold source inlet 213 and a cold source outlet 214, wherein the heat source inlet 211 is connected to the gas pipeline 101 to be separated, the cold source outlet 214 is connected to the return gas pipeline 102, and the cold source inlet 213 is connected to the return port 201; and, a primary surface cooler 220 having: a first inlet 221 and a first outlet 222, the first inlet 221 being connected to the heat source outlet 212; the secondary surface cooler 230 includes: a second inlet 231 and a second outlet 232, wherein the second inlet 231 is connected with the first outlet 222, and the second outlet 232 is connected with the cold source inlet 213 and the heat exchange material outlet 202. In the specific embodiment provided by the utility model, preferably, the heat exchange device can adopt a superconductive heat exchanger or a plate heat exchanger.

In the specific embodiment provided by the present utility model, preferably, the heat exchange NMP recovery line includes a second NMP recovery line and a third NMP recovery line, the second NMP recovery line is disposed on the primary surface cooler 220, and the third NMP recovery line is disposed on the secondary surface cooler 230.

After the temperature is reduced, the gas in the NMP recovery system is condensed by the primary and

secondary surface coolers

220 and 230 to the dew point of NMP, which condenses to a liquid. As a preferred embodiment, the NMP recovery system further comprises an NMP recovery tank 800, and the second NMP recovery line and the third NMP recovery line are connected to the NMP recovery tank 800.

In the specific embodiment provided by the utility model, preferably, the heat pump device 500 comprises a heat pump evaporator 510 and a heat pump condenser 520 which are connected in sequence, the heat pump inlet 501 is arranged on the heat pump evaporator 510, the heat pump outlet 502 is arranged on the heat pump condenser 520, and the heat pump evaporator 510 is provided with a first NMP recovery pipeline.

The gas entering from the heat pump inlet 501 firstly enters the heat pump evaporator 510 for cooling and condensing treatment, and the condensed NMP product is sent to the first NMP recovery pipeline. As a preferred embodiment, the NMP recovery system further comprises an NMP recovery tank 800, the first NMP recovery line being connected to the NMP recovery tank 800.

In the embodiment provided in the present utility model, preferably, the adsorption and desorption device 300 includes a rotating wheel adsorption assembly 310, a rotating wheel cooling assembly 320 and a rotating wheel desorption assembly 330; wherein,,

the runner adsorption assembly 310 is provided with an adsorption and desorption gas inlet 301 and an adsorption gas outlet 312, and the adsorption gas outlet 312 is connected with an external exhaust pipeline; the runner cooling assembly 320 is provided with a cooling inlet 321 and a cooling outlet 322, the cooling inlet 321 is connected with the adsorption gas outlet 312, the runner desorption assembly 330 is provided with a desorption gas inlet 331 and a desorption gas outlet 302, and the desorption gas inlet 331 is connected with the cooling outlet 322.

The runner adsorption component 310 processes the gas input by the adsorption and desorption gas inlet 301, a large number of molecular sieves are attached to the surface of the base material of the honeycomb runner, the molecular sieves adsorb NMP in the gas on the surface of the runner, and the runner adsorption component 310 slowly rotates and continuously adsorbs until saturation. After the rotating wheel rotates to enter the rotating wheel desorption assembly 330, the NMP adsorbed on the surface of the rotating wheel is desorbed by the heated reverse hot gas, and the desorbed NMP is discharged out of the adsorption and desorption device 300 along with the airflow through the desorption gas outlet 302.

By pre-treating the gas to be introduced into the rotor desorption assembly 330, the treatment effect of the rotor desorption assembly 330 can be enhanced. In the embodiment provided by the utility model, preferably, the NMP recovery system further comprises a regeneration heating device 340, and the regeneration heating device 340 is connected with the cooling outlet 322 and the desorption gas inlet 331 respectively. The type of the regenerative heating device 340 is not particularly limited in the present utility model, and examples thereof include: the regenerative heating device 340 may select an electric heating or a steam heating mode.

The gas exiting through the cold source outlet 214 may not meet the process requirements in temperature. In the embodiment provided by the utility model, preferably, the NMP recovery system further comprises a coater oven supplemental heater 600, the coater oven supplemental heater 600 comprises a heater inlet 610 and a heater outlet 620, the heater inlet 610 is connected with the cold source outlet 214, and the heater outlet 620 is connected with the coating and drying device 100.

In order to further improve the efficiency of gas delivery in the NMP recovery system, a fan assembly can be arranged at a corresponding position in the NMP recovery system according to the requirements of working conditions. In a specific embodiment provided by the present utility model, preferably, the NMP recovery system further includes: the first fan assembly 702 is disposed on the gas line 101 to be separated. A second fan assembly 703 is connected to the second outlet 232, the cold source inlet 213 and the adsorption and desorption gas inlet 301. A third fan assembly 704 is connected to the adsorption gas outlet 312, the external exhaust gas line and the cooling inlet 321. A fourth fan assembly 705 is connected to the desorption gas outlet 302 and the heat pump inlet 501. A fifth fan assembly 706 is disposed on the return air line 102 and has one end connected to the cold source outlet 214.

The NMP recovery system also includes a coater oven recycle fan 701 disposed on the return air line 102 and connected at one end to the heater inlet 610.

In a second aspect the utility model provides a lithium battery coating system comprising the NMP recovery system of the first aspect.

The following describes the operation of the process according to the technical scheme of the present utility model with reference to the NMP recovery system shown in fig. 1 and 2.

The NMP-containing gas to be separated (the exhaust temperature of the oven is typically 100-130 ℃) discharged from the coating and drying device 100 flows through the first fan assembly 702, and enters the first heat exchange device 210 through the heat source inlet 211 to perform heat exchange treatment, so as to obtain a first cooling gas, and the temperature of the first cooling gas is typically reduced to 50-70 ℃.

The first cooling gas enters the primary surface cooler 220 through the first inlet 221 for cooling treatment,

the heat exchange medium in the primary surface cooler 220 can use normal-temperature cooling water (cooling water temperature: 32 ℃ C. To 37 ℃ C.); the temperature of the first cooled gas is reduced to below 40 ℃ after being treated by the primary surface cooler 220, and a part of NMP is separated out.

The material flow treated by the primary surface cooler 220 enters the secondary surface cooler 230 for deep cooling, and chilled water (chilled water temperature: 7 ℃ -12 ℃) is used as a medium in the secondary surface cooler 230. After the treatment by the secondary surface cooler 230, the temperature of the material flow is controlled to be 15-20 ℃, and NMP in the material flow is further separated out after the material flow is deeply cooled by the secondary surface cooler 230. Finally obtaining NMP product and second cooling gas.

After the treatment by the heat exchange device 200, the concentration of NMP in the second cooling gas is reduced to 200-300 ppm, and the concentration is reduced to be very low, but the emission standard of the organic waste gas can not be met. The second cooling gas is split by the second fan assembly 703, most of the second cooling gas enters the first heat exchange device 210 through the cold source inlet 213 for heating treatment, and a small part of the second cooling gas enters the rotating wheel adsorption assembly 310 for adsorption treatment to obtain adsorption separation gas, a part of the adsorption separation gas enters the rotating wheel cooling assembly 320 for treatment through the cooling inlet 321, cooled exhaust gas is obtained through the cooling outlet 322, and the other part of the adsorption separation gas is discharged out of the NMP recovery system through an external exhaust gas pipeline.

The regenerative heating device 340 is used for pretreating the cooled exhaust gas to be introduced into the rotor desorption assembly 330 to obtain pretreated gas. The output end of the regeneration heating device 340 is connected to the desorption gas inlet 331, and the pretreatment gas carries out desorption treatment on the rotating wheel, so that the adsorption function of the rotating wheel is recovered.

The desorption gas discharged from the adsorption and desorption device 300 is input into the heat pump evaporator 510 through the fourth fan assembly 705, the heat pump evaporator 510 performs condensation treatment on the desorption gas to obtain an NMP product and condensed gas, and the condensed NMP product is collected in the NMP recovery storage tank 800.

The condensed gas enters a heat pump condenser 520 to be subjected to heating treatment, so as to obtain heat pump separated gas. The heat pump separation gas enters the heat exchange device 200 through the feed back port 201, is mixed with part of the second cooling gas, enters the first heat exchange device 210 through the cold source inlet 213, and is processed through the first heat exchange device 210 to obtain return gas.

After being led out by the fifth fan assembly 706, the return air is conveyed by the coater oven circulating fan 701, is further heated by the coater oven supplemental heater 600 (heated to the process required temperature of 130-150 ℃) and is returned to the coating and drying device 100. So far, the NMP recovery device completes the whole set of treatment flow of the gas.

The utility model provides an NMP recovery system which can change NMP in waste gas into liquid for recycling; the heat exchange is performed on the gas discharged from the coating and drying device 100 to achieve the purpose of heat recovery. After being treated by the adsorption and desorption device 300, the gas containing the waste heat is introduced into the heat pump device 500, and the heat pump device is used for cooling, and circulating gas of the heat pump device is used for passing through an ammonia cooler (also called as a liquid ammonia evaporator if ammonia is a refrigerant) during condensation, and the gas containing the waste heat after being treated by the adsorption and desorption device 300 is treated by the low-temperature evaporation and condensation of the liquid ammonia, so that NMP in the gas is condensed into liquid at the temperature of 10 ℃ or lower (higher than 0 ℃ to avoid the water vapor freezing blockage), and the NMP obtained by the first-stage surface cooler 220 and the second-stage surface cooler 230 is collected for later use. The heat of the heat pump device cools the compressed ammonia vapor to release heat to heat the gas entering the heat pump condenser 520, and the heated gas is mixed with part of the second cooling gas, and then is further heated by the first heat exchange device 210 to raise the temperature and returns to the coating and drying device 100. The return air returned to the coating and drying device 100 is raised to 70-80 ℃ compared with the temperature of 60-70 ℃ in the prior art, so that the energy utilization efficiency and the NMP recovery efficiency of the NMP recovery device are further improved.

The foregoing description of the preferred embodiments of the present utility model has been presented for purposes of clarity and understanding, and is not intended to limit the utility model to the particular embodiments disclosed, but is intended to cover all modifications, alternatives, and improvements within the spirit and scope of the utility model as outlined by the appended claims.

Claims

1. An NMP recovery system, characterized in that the NMP recovery system comprises: a coating and drying device (100), a heat exchange device (200), an adsorption and desorption device (300) and a heat pump device (500);

the coating and drying device (100) is connected with the heat exchange device (200) through a gas pipeline (101) to be separated and a reflux gas pipeline (102), and the heat exchange device (200), the adsorption and desorption device (300) and the heat pump device (500) are sequentially connected into a closed loop;

the heat exchange device (200) is provided with a feed back opening (201), a heat exchange material outlet (202) and a heat exchange NMP recovery pipeline,

the adsorption and desorption device (300) is provided with an adsorption and desorption gas inlet (301), an external exhaust pipeline and a desorption gas outlet (302), the adsorption and desorption gas inlet (301) is connected with the heat exchange material outlet (202),

the heat pump device (500) is provided with a heat pump inlet (501), a heat pump outlet (502) and a first NMP recovery pipeline, the heat pump inlet (501) is connected with the desorption gas outlet (302), and the heat pump outlet (502) is connected with the feed back port (201).

2. The NMP recovery system according to claim 1, characterized in that said heat exchange means (200) comprises:

a first heat exchange device (210) having: a heat source inlet (211), a heat source outlet (212), a cold source inlet (213) and a cold source outlet (214), wherein the heat source inlet (211) is connected to the gas pipeline (101) to be separated, the cold source outlet (214) is connected to the reflux gas pipeline (102), and the cold source inlet (213) is connected to the feed back port (201); the method comprises the steps of,

a primary surface cooler (220) having: a first inlet (221) and a first outlet (222), the first inlet (221) being connected to the heat source outlet (212);

a secondary surface cooler (230) having: the second inlet (231) is connected with the first outlet (222), and the second outlet (232) is connected with the cold source inlet (213) and the heat exchange material outlet (202).

3. The NMP recovery system of claim 2, characterized in that the heat exchanging NMP recovery line includes a second NMP recovery line disposed on the primary surface cooler (220) and a third NMP recovery line disposed on the secondary surface cooler (230).

4. The NMP recovery system according to claim 2, characterized in that the heat pump device (500) comprises a heat pump evaporator (510) and a heat pump condenser (520) connected in sequence, the heat pump inlet (501) being arranged on the heat pump evaporator (510), the heat pump outlet (502) being arranged on the heat pump condenser (520), the heat pump evaporator (510) being provided with a first NMP recovery line.

5. The NMP recovery system of claim 2, characterized in that the adsorption and desorption device (300) includes a rotor adsorption assembly (310), a rotor cooling assembly (320) and a rotor desorption assembly (330); wherein,,

the runner adsorption assembly (310) is provided with an adsorption and desorption gas inlet (301) and an adsorption gas outlet (312), and the adsorption gas outlet (312) is connected with the external exhaust gas pipeline;

the rotating wheel cooling assembly (320) is provided with a cooling inlet (321) and a cooling outlet (322), the cooling inlet (321) is connected with the adsorption gas outlet (312),

the rotating wheel desorption assembly (330) is provided with a desorption gas inlet (331) and a desorption gas outlet (302), and the desorption gas inlet (331) is connected with the cooling outlet (322).

6. The NMP recovery system according to claim 5, characterized in that it further comprises a regenerative heating device (340), said regenerative heating device (340) being connected to said cooling outlet (322) and said desorption gas inlet (331), respectively.

7. The NMP recovery system of any one of claims 2-6, characterized in that said NMP recovery system further comprises a coater oven supplemental heater (600), said coater oven supplemental heater (600) comprising a heater inlet (610) and a heater outlet (620), said heater inlet (610) being connected to said cold source outlet (214), said heater outlet (620) being connected to said coating and drying apparatus (100);

the NMP recovery system further comprises a coater oven circulating fan (701) arranged on the reflux gas pipeline (102) and one end of the NMP recovery system is connected with the heater inlet (610).

8. The NMP recovery system of any one of claims 1 to 6, further comprising an NMP recovery tank (800), wherein the first NMP recovery line and the heat exchanging NMP recovery line are both connected to the NMP recovery tank (800).

9. The NMP recovery system of claim 5 or 6, further comprising:

a first fan assembly (702) arranged on the gas pipeline (101) to be separated;

a second fan assembly (703) connected to the second outlet (232), the cold source inlet (213) and the adsorption and desorption gas inlet (301);

a third fan assembly (704) connected to the adsorption gas outlet (312), the external exhaust gas line and the cooling inlet (321);

a fourth fan assembly (705) connected to the desorption gas outlet (302) and the heat pump inlet (501);

and a fifth fan assembly (706) disposed on the return air line (102) and having one end connected to the cold source outlet (214).

10. A lithium battery coating system, characterized in that: the lithium battery coating system comprises the NMP recovery system according to any one of claims 1-9.