阅读说明：本技术 Nmp回收系统及锂电池涂布系统 (NMP recovery system and lithium battery coating system ) 是由 郭少辉 蒋永忠 吴承翰 于 2020-05-19 设计创作，主要内容包括：本发明公开了一种NMP回收系统及锂电池涂布系统,包括涂布机烘箱、NMP吸附系统和若干循环回收系统,涂布机烘箱包括若干排风机和若干回风机,每个循环回收系统均包括热交换器和冷凝回收装置,排风口通过排风管与热交换器的高温介质进口相连,热交换器的高温介质出口通过冷凝管与冷凝回收装置的第一进口相连；NMP吸附系统的进气口通过NMP风管分别与每个冷凝回收装置的第一出口相连；冷凝回收装置的第二出口通过第一回风管与热交换器的低温介质进口相连,热交换器的低温介质出口通过第二回风管与回风口相连。本发明的技术方案不仅能够可控调节以满足多种循环风量的回收需求(特别是满足超大的循环风量),且能够有效减少热损失。(The invention discloses an NMP recovery system and a lithium battery coating system, which comprise a coating machine drying oven, an NMP adsorption system and a plurality of circulation recovery systems, wherein the coating machine drying oven comprises a plurality of exhaust fans and a plurality of air return fans, each circulation recovery system comprises a heat exchanger and a condensation recovery device, an exhaust outlet is connected with a high-temperature medium inlet of the heat exchanger through an exhaust pipe, and a high-temperature medium outlet of the heat exchanger is connected with a first inlet of the condensation recovery device through a condensing pipe; an air inlet of the NMP adsorption system is respectively connected with a first outlet of each condensation recovery device through an NMP air pipe; and a second outlet of the condensation recovery device is connected with a low-temperature medium inlet of the heat exchanger through a first air return pipe, and a low-temperature medium outlet of the heat exchanger is connected with an air return inlet through a second air return pipe. The technical scheme of the invention not only can be controllably adjusted to meet the recovery requirements of various circulating air volumes (especially meet the ultra-large circulating air volume), but also can effectively reduce heat loss.)

1. An NMP recovery system, comprising:

the coating machine drying oven comprises a plurality of exhaust fans and a plurality of air returning fans, wherein each exhaust fan is provided with an exhaust outlet, and each air returning fan is provided with an air returning opening;

the NMP adsorption system is provided with an air inlet and an air outlet for discharging air out of the room;

the system comprises a plurality of circulating recovery systems, a plurality of heat exchangers and a condensing recovery device, wherein each circulating recovery system comprises a heat exchanger and a condensing recovery device, an air outlet is connected with a high-temperature medium inlet of the heat exchanger through an exhaust pipe, and a high-temperature medium outlet of the heat exchanger is connected with a first inlet of the condensing recovery device through a condensing pipe; an air inlet of the NMP adsorption system is respectively connected with a first outlet of each condensation recovery device through an NMP air pipe; and a second outlet of the condensation recovery device is connected with a low-temperature medium inlet of the heat exchanger through a first air return pipe, and a low-temperature medium outlet of the heat exchanger is connected with the air return port through a second air return pipe.

2. An NMP recovery system according to claim 1, characterized in that: the NMP recovery system is provided with ten circulating recovery systems; ten exhaust fans are arranged above the coating machine drying oven, and ten air return fans are arranged below the coating machine drying oven.

3. An NMP recovery system according to claim 1, characterized in that: the NMP adsorption system is provided with a freezer, a rotating wheel, a regeneration fan and a treatment fan, wherein the regeneration fan is connected with the rotating wheel, and the regeneration fan is positioned between the freezer and the rotating wheel; the air inlet is directed toward the freezer; the treatment fan is connected to the gas outlet through a first air pipe, and the treatment fan is further connected with the rotating wheel through a second air pipe.

4. An NMP recovery system according to claim 3, wherein: the NMP adsorption system comprises a heater and an electric heater, the rotating wheel is provided with an adsorption area, a regeneration area and a cooling area, and the regeneration fan is connected with the regeneration area; the preheating pipe is sequentially connected with the cooling zone, the electric heater, the heater and the regeneration zone, the adsorption zone is connected with the treatment fan, and the treatment fan is connected with the cooling zone through the second air pipe.

5. An NMP recovery system according to claim 1, characterized in that: the condensation recovery device comprises a first condensation device and a second condensation device which are connected in sequence, the first condensation device is provided with the first inlet, and the second condensation device is provided with the first outlet and the second outlet; a high-temperature medium outlet of the heat exchanger is connected with a first inlet of the first condensing device through the condensing pipe, and an air inlet of the NMP adsorption system is respectively connected to a first outlet of each second condensing device through the NMP air pipe; and a second outlet of the second condensing device is connected with a low-temperature medium inlet of the heat exchanger through the first air return pipe.

6. An NMP recovery system according to claim 1, characterized in that: the circulating recovery system further comprises an air return device, the air return device is located between the heat exchanger and the air return fan, a low-temperature medium outlet of the heat exchanger is connected with an air inlet of the air return device through the second air return pipe, and an air outlet of the air return device is connected to the air return inlet through a third air return pipe.

7. An NMP recovery system according to claim 1, characterized in that: the coating machine drying oven comprises a heating unit, the heating unit is adjacent to the air return fan, and the heating unit is used for heating substances discharged by the air return fan.

8. An NMP recovery system according to claim 1, characterized in that: the NMP adsorption system further comprises an exhaust valve, the exhaust valve is connected with the air outlet, and the exhaust valve is used for exhausting the gas treated by the NMP adsorption system out of a room; and the first air return pipe and the second air return pipe are both provided with air return valves.

9. An NMP recovery system according to claim 1, characterized in that: and a high-efficiency filter is further arranged on the second air return pipe and is positioned between the air return fan and the heat exchanger.

10. A lithium battery coating system, characterized in that: an NMP recovery system including an NMP recovery system as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of lithium battery manufacturing, in particular to an NMP (N-methyl pyrrolidone) recovery system and a lithium battery coating system.

Background

In recent years, with the vigorous popularization of new energy policy, the lithium battery industry shows the well-spraying growth, and as a key device in the lithium battery manufacturing industry, the lithium battery coating machine has the same requirements as the film. The lithium battery coating machine mainly comprises a coating part and an oven part, wherein the oven part needs to consume a large amount of heat energy due to heating air; the coating part is used for coating prepared pasty insulating slurry dissolved by NMP as a solvent on an electrode base material (a copper foil or an aluminum box) according to requirements, then a heater of an oven part is used for heating ambient temperature air to 120 ℃, the hot air is used for drying the slurry solvent NMP coated on the electrode base material, the remaining solid organic polymer forms a firm high insulating layer on the electrode base material and is used for manufacturing a lithium battery electrode, and waste gas containing gaseous NMP is subjected to recovery treatment and then is subjected to organized discharge.

NMP is widely used as an irreplaceable organic solvent in the lithium battery manufacturing industry and other industries. NMP, chemical name: n-methyl pyrrolidone is also called 1-methyl-2 pyrrolidone, N-methyl-2 pyrrolidone. NMP is colorless transparent oily liquid with slight amine smell. Low volatility, good thermal stability and chemical stability, and can volatilize with water vapor, the melting point is-24 ℃, and the boiling point is 202 ℃. NMP is expensive and occupies a large cost of lithium battery electrode production, and waste gas containing NMP causes certain harm to the environment if being directly discharged, so that the method has important significance for recycling NMP and limiting discharge. At present, an NMP recovery system is usually provided with equipment such as a coater oven and an NMP adsorption system to recycle NMP, and besides expensive NMP needs to be recycled, waste gas needs to be treated to reach the emission standard and then be discharged outdoors. In addition, the air in the NMP recovery system also flows back from the return air channel and enters the coating machine drying oven again for utilization, so that the air is recycled to form the circulating air volume. However, the conventional NMP recovery system can only achieve a fixed circulation air volume (for example, the conventional NMP recovery system is limited in volume due to factors such as transportation, and thus can only achieve a maximum circulation air volume of 15 ten thousand) and the air duct in the NMP recovery system also needs to be very large in volume, so that the heat loss is also large.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an NMP recovery system and a lithium battery coating system, which can be controllably adjusted to meet the recovery requirements of various circulating air volumes and can effectively reduce heat loss.

In a first aspect of the embodiments of the present invention, there is provided an NMP recovery system, including:

the coating machine drying oven comprises a plurality of exhaust fans and a plurality of air returning fans, wherein each exhaust fan is provided with an exhaust outlet, and each air returning fan is provided with an air returning opening;

the NMP adsorption system is provided with an air inlet and an air outlet for discharging air out of the room;

the system comprises a plurality of circulating recovery systems, a plurality of heat exchangers and a condensing recovery device, wherein each circulating recovery system comprises a heat exchanger and a condensing recovery device, an air outlet is connected with a high-temperature medium inlet of the heat exchanger through an exhaust pipe, and a high-temperature medium outlet of the heat exchanger is connected with a first inlet of the condensing recovery device through a condensing pipe; an air inlet of the NMP adsorption system is respectively connected with a first outlet of each condensation recovery device through an NMP air pipe; and a second outlet of the condensation recovery device is connected with a low-temperature medium inlet of the heat exchanger through a first air return pipe, and a low-temperature medium outlet of the heat exchanger is connected with the air return port through a second air return pipe.

According to one or more technical schemes provided by the invention, the method has at least the following beneficial effects: on one hand, the number and the size of the recycling systems can be intelligently adjusted by arranging a plurality of recycling systems according to the requirements of circulating air volume of various wind levels, or the circulating air volume of each recycling system can be controlled to be the same or different, so that the recycling requirement of larger circulating air volume is realized (for example, more than 20 ten thousand of circulating air volume can be recycled in an NMP recycling system), and controllable adjustment is realized. And because the circulating air volume between each circulating recovery system is smaller, air pipes such as an exhaust pipe or a return air pipe are correspondingly arranged to be smaller, thereby effectively reducing the heat loss. On the other hand, compared with the prior art that the volume of the recycling system needs to be set to be very large to meet the recycling requirement of fixed circulating air volume, the recycling system is very inconvenient to transport and install; the NMP recovery system in the embodiment of the invention is provided with a plurality of circulating recovery systems with smaller volume, thereby being convenient for transportation and installation, reducing the occupied area and having practicability.

According to some embodiments of the invention, the NMP recovery system is provided with ten recycle recovery systems; ten exhaust fans are arranged above the coating machine drying oven, and ten air return fans are arranged below the coating machine drying oven.

According to some embodiments of the present invention, the NMP adsorption system is provided with a freezer, a rotating wheel, a regeneration fan and a treatment fan, the regeneration fan is connected with the rotating wheel, and the regeneration fan is located between the freezer and the rotating wheel; the air inlet is directed toward the freezer; the treatment fan is connected to the gas outlet through a first air pipe, and the treatment fan is further connected with the rotating wheel through a second air pipe.

According to some embodiments of the present invention, the NMP adsorption system comprises a heater and an electric heater, the wheel is provided with an adsorption zone, a regeneration zone and a cooling zone, and the regeneration fan is connected to the regeneration zone; the preheating pipe is sequentially connected with the cooling zone, the electric heater, the heater and the regeneration zone, the adsorption zone is connected with the treatment fan, and the treatment fan is connected with the cooling zone through the second air pipe.

According to some embodiments of the invention, the condensation recovery device comprises a first condensation device and a second condensation device connected in sequence, the first condensation device is provided with the first inlet, and the second condensation device is provided with the first outlet and the second outlet; a high-temperature medium outlet of the heat exchanger is connected with a first inlet of the first condensing device through the condensing pipe, and an air inlet of the NMP adsorption system is respectively connected to a first outlet of each second condensing device through the NMP air pipe; and a second outlet of the second condensing device is connected with a low-temperature medium inlet of the heat exchanger through the first air return pipe.

According to some embodiments of the invention, the recycling system further comprises a return air device, the return air device is located between the heat exchanger and the return fan, the low-temperature medium outlet of the heat exchanger is connected with the air inlet of the return air device through the second return air pipe, and the air outlet of the return air device is connected to the return air inlet through a third return air pipe.

According to some embodiments of the invention, the coater oven comprises a heating unit disposed adjacent to the air return fan, the heating unit being configured to heat the substance discharged by the air return fan.

According to some embodiments of the present invention, the NMP adsorption system further comprises an exhaust valve, the exhaust valve is connected to the air outlet, and the exhaust valve is used for exhausting the gas treated by the NMP adsorption system to the outside; and the first air return pipe and the second air return pipe are both provided with air return valves.

According to some embodiments of the invention, a high efficiency filter is further disposed on the second return air pipe, and the high efficiency filter is located between the air return fan and the heat exchanger.

In a second aspect of embodiments of the present invention, there is provided a lithium battery coating system comprising an NMP recovery system as described in the first aspect above. Since the lithium battery coating system according to the embodiment of the present invention is provided with the NMP recovery system according to the first aspect, the lithium battery coating system has the beneficial effects and functional characteristics of any one of the NMP recovery systems.

Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram showing the construction of an NMP recovery system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the recycle system shown in FIG. 1;

FIG. 3 is a schematic diagram of the structure of the NMP adsorption system shown in FIG. 1;

FIG. 4 is a schematic diagram of the NMP recovery system according to another embodiment of the present invention;

FIG. 5 is a schematic structural view of an NMP recovery system according to another embodiment of the present invention.

Reference numerals:

a coater oven 100, an exhaust fan 110, a return fan 120, a heating unit 130,

The recycling system 200, the heat exchanger 210, the high-temperature medium inlet 211, the high-temperature medium outlet 212, the low-temperature medium inlet 213, the low-temperature medium outlet 214, the condensation recycling device 220, the first inlet 221, the first outlet 222, the second outlet 223, the first condensing device 230, the second condensing device 240, the air returning device 250, the air inlet 251, the air outlet 252, the air outlet,

An NMP adsorption system 300, an air inlet 301, an air outlet 302, a freezer 310, a rotating wheel 320, a regeneration zone 321, a cooling zone 322, an adsorption zone 323, a regeneration fan 330, a treatment fan 340, a heater 350 and an electric heater 360.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the orientation or positional relationship referred to orientation descriptions, such as up, down, left, right, front, rear, outer, inner, longitudinal, lateral, vertical, horizontal, etc., are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.