CN215842408U - Lithium ion battery coating process NMP recovery unit - Google Patents
Lithium ion battery coating process NMP recovery unit Download PDFInfo
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- CN215842408U CN215842408U CN202122120564.7U CN202122120564U CN215842408U CN 215842408 U CN215842408 U CN 215842408U CN 202122120564 U CN202122120564 U CN 202122120564U CN 215842408 U CN215842408 U CN 215842408U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The utility model discloses a device for recovering NMP in a lithium ion battery coating procedure, which belongs to the field of NMP recovery and comprises a coating oven, a coating oven exhaust fan, a gas-gas heat exchanger, a surface cooler, a return fan, an exhaust fan, a separation membrane component, a return air induced draft fan, a coating oven circulating fan and an electric heater; the coating oven is connected with the coating oven exhaust fan and used for generating high-temperature NMP-containing waste gas and conveying the NMP-containing waste gas to the coating oven exhaust fan; the coating oven exhaust fan is connected with the gas-gas heat exchanger and used for conveying the received NMP waste gas to the gas-gas heat exchanger; the air-air heat exchanger is connected with surface cooler, return air draught fan for carry out the heat exchange cooling to the NMP waste gas of receiving, the NMP waste gas after again with the heat exchange is carried for the surface cooler, in addition, the air-air heat exchanger is received and is carried the cooling back gas that comes through the surface cooler to heat up the air. According to the utility model, through the arranged separation membrane assembly, the structure is simplified, the cost is reduced, and the energy consumption is reduced.
Description
Technical Field
The utility model relates to the technical field of NMP recovery, in particular to an NMP recovery device in a lithium ion battery coating procedure.
Background
N-methylpyrrolidone (NMP), also known as 1-methyl-2-pyrrolidone or N-methyl-2-pyrrolidone, is a colorless transparent oily liquid with a slight amine odor; the volatility is low, the thermal stability and the chemical stability are both good, and the volatile oil can be volatilized along with water vapor; it is hygroscopic; is sensitive to light; it is easily soluble in water, ethanol, diethyl ether, acetone, ethyl acetate, chloroform and benzene, and can dissolve most organic and inorganic compounds, polar gas, natural and synthetic high molecular compounds. N-methyl pyrrolidone is widely applied to the industries of lithium batteries, medicines, pesticides, pigments, cleaning agents, insulating materials and the like.
In the manufacture of lithium battery, the positive electrode material is fully stirred with NMP to make slurry, the slurry is uniformly coated on the copper foil by using a coater, and the NMP is rapidly evaporated by using high temperature (between 90 ℃ and 140 ℃), so that the energy consumption of the coating process is high. NMP has the characteristics of flammability and toxicity, can not be directly discharged, has higher recovery value, and is generated for ensuring the use safety and reducing the enterprise cost.
The prior system recovers NMP in mixed gas discharged by a drying pole piece of a coating machine drying oven in three steps:
primarily cooling the air exhausted by the coating oven through gas-gas heat exchange: exhaust gas (the temperature is about 100 ℃ generally) of the coating machine passes through a waste heat recovery device, and heat exchange is carried out between the air recycled (the temperature is about 20 ℃) condensed by an NMP system and the exhaust gas of the coating machine, so that the exhaust gas of the coating machine is primarily cooled (about 70 ℃), and the cooled gas enters a turning wheel recovery device for next treatment; meanwhile, the fresh air entering the coating machine is preheated and recovered by a preheating and recovering device, and is heated (about 65 ℃) by utilizing the high-temperature exhaust air of the coating oven, and then is sent into the coating machine. The return air temperature of the coating oven is heated while the exhaust air temperature is reduced, so that the purposes of waste heat recovery and energy conservation are achieved;
surface air cooler condensation: after the heat exchange treatment of the exhausted air of the coating machine, the temperature is reduced to about 20 ℃ through a primary surface air cooler and a secondary surface air cooler (circulating chilled water for a refrigerant), a large amount of NMP is separated out, and the content of the NMP in the treated air is about 300 ppm.
And (3) rotary wheel adsorption concentration: in order to further recover the NMP in the mixed gas and make the NMP reach the emission standard, a VOC (volatile organic compound) zeolite rotating wheel is used for adsorbing and concentrating the NMP in the cooled mixed air, and the NMP in the concentrated mixed air is refluxed to the front end of a surface cooler to be condensed and separated out.
Through the steps, the NMP recovery rate can reach more than 98%, the NMP content exhausted after the rotary wheel recovery treatment meets the environmental protection requirement, and the NMP is exhausted through an exhaust system.
The prior art has the following problems: the zeolite wheel is relatively expensive and requires a large amount of electricity for regenerative heating. Therefore, the technical personnel in the field provide a NMP recovery device in the coating process of the lithium ion battery to solve the problems in the background technology.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a device for recovering NMP in a coating process of a lithium ion battery, which simplifies the structure, reduces the cost and simultaneously reduces the energy consumption by arranging a separation membrane component so as to solve the problems in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme:
a lithium ion battery coating process NMP recovery unit, comprising:
the coating oven is connected with the coating oven exhaust fan and used for generating high-temperature NMP-containing waste gas and conveying the NMP-containing waste gas to the coating oven exhaust fan;
the coating oven exhaust fan is connected with the gas-gas heat exchanger and used for conveying the received NMP waste gas to the gas-gas heat exchanger;
the air-air heat exchanger is connected with the surface cooler and the return air draught fan and used for carrying out heat exchange cooling on the received NMP waste gas and then conveying the heat-exchanged NMP waste gas to the surface cooler;
the surface cooler is connected with the exhaust fan and used for cooling the received NMP waste gas, condensing NMP, dividing the cooled gas into two paths for output, wherein one path of gas is conveyed to the gas-gas heat exchanger for heating, the other path of gas is conveyed to the exhaust fan, the surface cooler cools the concentrated NMP gas conveyed by the return fan and conveyed by the separation membrane module after being mixed with the air supplied by the gas-gas heat exchanger, and the NMP is condensed again;
the exhaust fan is connected with the separation membrane component and used for receiving the other path of cooled gas and then conveying the path of cooled gas to the separation membrane component;
the separation membrane component is connected with the air return fan and the external discharge port and used for receiving the cooled gas conveyed by the exhaust fan and then separating the concentrated NMP gas from the air, the separated concentrated NMP gas is conveyed to the air return fan, and the separated air is conveyed to the external discharge port and is discharged from the external discharge port;
an outer discharge port connected to the separation membrane module for discharging the air separated by the separation membrane module;
the air return fan is connected with the surface cooler and used for receiving the concentrated NMP gas passing through the separation membrane module and conveying the concentrated NMP gas to the surface cooler;
the air return induced draft fan is connected with the coating oven circulating fan and used for receiving the heated gas transmitted by the gas-gas heat exchanger and transmitting the heated gas to the coating oven circulating fan;
the coating oven circulating fan is connected with the electric heater and used for receiving the heated gas conveyed by the return air draught fan and conveying the heated gas to the electric heater;
and the electric heater is connected with the coating oven and used for heating the received heated gas again and then conveying the heated high-temperature gas to the coating oven for the coating oven to produce high-temperature NMP-containing waste gas.
Through the arranged separation membrane assembly, the structure is simplified, the cost is reduced, and the energy consumption is reduced.
As a further scheme of the utility model: the separation membrane component selects one organic membrane or a plurality of organic membranes connected in series.
When the waste gas after condensation treatment passes through the pressure difference between two sides generated by the exhaust fan and the air return fan, the waste gas passes through the separation membrane component, NMP organic molecules in the waste gas are pushed by the pressure to be used as concentrated permeation gas, the concentrated permeation gas passes through the organic membrane and returns to the front end of the surface cooler to be mixed with the gas passing through the gas-gas heat exchanger, the concentrated permeation gas is separated out by condensation and flows to a recovery liquid tank, and the air (containing a small amount of water vapor) separated by the separation membrane component is directly discharged into the atmosphere.
As a still further scheme of the utility model: the gas-gas heat exchanger cools NMP waste gas to 60-70 ℃.
As a still further scheme of the utility model: the surface cooler cools NMP waste gas to 10-20 ℃.
As a still further scheme of the utility model: the air-gas heat exchanger heats the air delivered by the air returning machine to 55-65 ℃.
As a still further scheme of the utility model: the electric heater heats the air to 90-140 ℃.
As a still further scheme of the utility model: the gas received by the gas-gas heat exchanger and the exhaust fan from the surface cooler accounts for 90% and 10% of the total gas respectively.
As a still further scheme of the utility model: the concentration NMP gas accounts for 1-3% of the total gas entering the separation membrane module.
The arrangement ensures that the NMP content in the air passing through the separation membrane component reaches the emission standard.
As a still further scheme of the utility model: still include recovery fluid reservoir and positive displacement pump, recovery fluid reservoir is connected with the surface cooler for retrieve the NMP that the surface cooler condenses out, the positive displacement pump is connected with the recovery fluid reservoir for discharge the NMP in the recovery fluid reservoir.
Compared with the prior art, the utility model has the beneficial effects that:
1. because the domestic zeolite rotating wheel technology is immature, the zeolite rotating wheel mainly imported from Japan for the NMP recovery system at present has high cost and long delivery period, and because the lithium battery industry is developed rapidly, the conditions of insufficient supply and untimely supply exist, the domestic separation membrane technology is mature, the zeolite rotating wheel is applied to a plurality of industries, the cost has great advantages compared with the zeolite rotating wheel, the cost is further reduced, and the prosperous development of the industry is promoted.
2. The membrane separation has no phase change, a large amount of electric power is consumed compared with the regeneration heating of the zeolite rotating wheel, the energy consumption can be greatly reduced by adopting the membrane separation, the system structure and the size of equipment are simplified, a multistage membrane series connection mode can be adopted according to different requirements of treatment depth, and the expansion is simple and convenient.
3. The utility model adopts a closed and circulating pipeline system, has high recycling rate, is beneficial to environmental protection, and has obvious effects of recycling heat energy, saving air and secondarily heating energy.
Drawings
Fig. 1 is a schematic structural diagram of an NMP recovery apparatus in a lithium ion battery coating process.
In the figure: 1. coating an oven; 2. a coating oven exhaust fan; 3. a gas-gas heat exchanger; 4. a surface cooler; 5. a return fan; 6. an exhaust fan; 7. a separation membrane module; 8. a return air draught fan; 9. a circulating fan of the coating oven; 10. an electric heater; 11. recovering the liquid tank; 12. a liquid discharge pump; 13. an outer discharge port.
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, an NMP recovery apparatus for a coating process of a lithium ion battery includes:
the coating oven 1 is connected with the coating oven exhaust fan 2 and used for generating high-temperature NMP-containing waste gas and conveying the NMP-containing waste gas to the coating oven exhaust fan 2;
the coating oven exhaust fan 2 is connected with the gas-gas heat exchanger 3 and used for conveying the received NMP waste gas to the gas-gas heat exchanger 3;
the air-gas heat exchanger 3 is connected with the surface cooler 4 and the return air draught fan 8 and used for carrying out heat exchange cooling on the received NMP waste gas and then conveying the NMP waste gas after heat exchange to the surface cooler 4, in addition, the air-gas heat exchanger 3 receives the cooled gas conveyed by the surface cooler 4, heats the gas and then conveys the heated gas to the coating oven circulating fan 9 through the return air draught fan 8;
the surface cooler 4 is connected with the exhaust fan 6 and used for cooling the received NMP waste gas, condensing NMP, dividing the cooled gas into two paths for output, wherein one path of gas is conveyed to the gas-gas heat exchanger 3 for heating, the other path of gas is conveyed to the exhaust fan 6, the surface cooler 4 supplies air to the concentrated NMP gas conveyed by the air return fan 5 and sent by the separation membrane assembly 7, mixes the concentrated NMP gas with the gas-gas heat exchanger 3 for cooling, and condenses NMP again;
the exhaust fan 6 is connected with the separation membrane component 7 and used for receiving the other path of cooled gas and conveying the path of cooled gas to the separation membrane component 7;
the separation membrane component 7 is connected with the air return fan 5 and the external discharge port 13 and is used for receiving the cooled gas conveyed by the exhaust fan 6, then separating the concentrated NMP gas from the air, conveying the separated concentrated NMP gas to the air return fan 5, and conveying the separated air to the external discharge port 13 and discharging the air from the external discharge port 13;
an outer discharge port 13 connected to the separation membrane module 7 for discharging the air separated by the separation membrane module 7;
the air returning machine 5 is connected with the surface cooler 4 and used for receiving the concentrated NMP gas passing through the separation membrane component 7 and conveying the concentrated NMP gas to the surface cooler 4;
the air return induced draft fan 8 is connected with the coating oven circulating fan 9 and used for receiving the heated gas transmitted by the gas-gas heat exchanger 3 and transmitting the heated gas to the coating oven circulating fan 9;
the coating oven circulating fan 9 is connected with the electric heater 10 and used for receiving the heated gas conveyed by the return air draught fan 8 and conveying the heated gas to the electric heater 10;
and the electric heater 10 is connected with the coating oven 1 and is used for heating the received heated gas again, and then conveying the heated high-temperature gas to the coating oven 1 for the coating oven 1 to produce high-temperature NMP-containing waste gas.
Through the arranged separation membrane assembly 7, the structure is simplified, the cost is reduced, and the energy consumption is reduced.
In this embodiment: the separation membrane component 7 is an organic membrane or a plurality of organic membranes connected in series. When the condensed waste gas passes through the pressure difference between two sides generated by the exhaust fan 6 and the air return fan 5, the waste gas passes through the separation membrane component 7, NMP organic molecules in the waste gas are pushed by the pressure to be used as concentrated permeation gas, the concentrated permeation gas passes through the organic membrane and returns to the front end of the surface air cooler 4 to be mixed with the gas passing through the gas-gas heat exchanger 3, the concentrated permeation gas is separated out by condensation and flows to the recovery liquid tank 11, and the air (containing a small amount of water vapor) separated by the separation membrane component 7 is directly discharged into the atmosphere.
In this embodiment: the gas-gas heat exchanger 3 cools the NMP waste gas to 60-70 ℃.
In this embodiment: the surface cooler 4 cools the NMP waste gas to 10-20 ℃.
In this embodiment: the air-gas heat exchanger 3 heats the air delivered by the air returning machine 5 to 55-65 ℃.
In this embodiment: the electric heater 10 heats the air to 90-140 ℃.
In this embodiment: the gas received by the gas-gas heat exchanger 3 and the exhaust fan 6 from the surface cooler 4 accounts for 90 percent and 10 percent of the total gas respectively.
In this embodiment: the concentration NMP gas accounts for 1-3% of the total gas entering the separation membrane module 7. The arrangement ensures that the NMP content in the air after passing through the separation membrane module 7 reaches the emission standard.
In this embodiment: still include recovery fluid reservoir 11 and positive displacement pump 12, recovery fluid reservoir 11 is connected with surface cooler 4 for retrieve the NMP of surface cooler 4 condensation play, positive displacement pump 12 is connected with recovery fluid reservoir 11 for discharge the NMP in the recovery fluid reservoir 11.
The working principle of the utility model is as follows: when the device is used, firstly, the coating oven 1 produces high-temperature NMP-containing waste gas, the NMP waste gas is conveyed to the coating oven exhaust fan 2, and the coating oven exhaust fan 2 conveys the received NMP waste gas to the gas-gas heat exchanger 3. The gas-gas heat exchanger 3 carries out heat exchange cooling on the received NMP waste gas, then conveys the NMP waste gas after heat exchange to the surface cooler 4, and the surface cooler 4 cools the received NMP waste gas and condenses out NMP. The cooled air is divided into two paths and respectively delivered to the air-gas heat exchanger 3 and the exhaust fan 6, and the air-gas heat exchanger 3 receives one path of cooled air. The exhaust fan 6 receives the other path of cooled gas, and then conveys the path of cooled gas to the separation membrane component 7. The separation membrane assembly 7 receives the cooled gas conveyed by the exhaust fan 6, then separates the gas from the concentrated NMP gas and the air, the separated concentrated NMP gas is conveyed to the return fan 5, and the separated air is conveyed to the external discharge port 13 and is discharged from the external discharge port 13. The air return fan 5 conveys the concentrated NMP gas separated by the separation membrane component 7 to the surface cooler 4, the surface cooler 4 cools the NMP gas conveyed by the air return fan 5 and the air supplied by the air-gas heat exchanger 3 after mixing, the NMP is condensed again, and the NMP condensed twice flows into the recovery liquid tank 11 at the same time. The gas-gas heat exchanger 3 heats the air transmitted by the surface air cooler 4, then transmits the heated air to the air return induced draft fan 8, then transmits the air to the coating oven circulating fan 9 through the air return induced draft fan 8, and then transmits the air to the electric heater 10 through the coating oven circulating fan 9, the electric heater 10 heats the received air again, and then transmits the heated high-temperature gas to the coating oven 1 for the coating oven 1 to produce high-temperature NMP-containing waste gas.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the scope of the present invention, and the technical solutions and the utility model concepts of the present invention are equivalent to or changed within the scope of the present invention.
Claims (9)
1. A lithium ion battery coating process NMP recovery unit characterized by comprising:
the coating oven is connected with the coating oven exhaust fan and used for generating high-temperature NMP-containing waste gas and conveying the NMP-containing waste gas to the coating oven exhaust fan;
the coating oven exhaust fan is connected with the gas-gas heat exchanger and used for conveying the received NMP waste gas to the gas-gas heat exchanger;
the air-air heat exchanger is connected with the surface cooler and the return air draught fan and used for carrying out heat exchange cooling on the received NMP waste gas and then conveying the heat-exchanged NMP waste gas to the surface cooler;
the surface cooler is connected with the exhaust fan and used for cooling the received NMP waste gas, condensing NMP, dividing the cooled gas into two paths for output, wherein one path of gas is conveyed to the gas-gas heat exchanger for heating, the other path of gas is conveyed to the exhaust fan, the surface cooler cools the concentrated NMP gas conveyed by the return fan and conveyed by the separation membrane module after being mixed with the air supplied by the gas-gas heat exchanger, and the NMP is condensed again;
the exhaust fan is connected with the separation membrane component and used for receiving the other path of cooled gas and then conveying the path of cooled gas to the separation membrane component;
the separation membrane component is connected with the air return fan and the external discharge port and used for receiving the cooled gas conveyed by the exhaust fan and then separating the concentrated NMP gas from the air, the separated concentrated NMP gas is conveyed to the air return fan, and the separated air is conveyed to the external discharge port and is discharged from the external discharge port;
an outer discharge port connected to the separation membrane module for discharging the air separated by the separation membrane module;
the air return fan is connected with the surface cooler and used for receiving the concentrated NMP gas passing through the separation membrane module and conveying the concentrated NMP gas to the surface cooler;
the air return induced draft fan is connected with the coating oven circulating fan and used for receiving the heated gas transmitted by the gas-gas heat exchanger and transmitting the heated gas to the coating oven circulating fan;
the coating oven circulating fan is connected with the electric heater and used for receiving the heated gas conveyed by the return air draught fan and conveying the heated gas to the electric heater;
and the electric heater is connected with the coating oven and used for heating the received heated gas again and then conveying the heated high-temperature gas to the coating oven for the coating oven to produce high-temperature NMP-containing waste gas.
2. The device for recovering NMP in the coating process of the lithium ion battery according to claim 1, wherein the separation membrane module is an organic membrane or a plurality of organic membranes connected in series.
3. The device for recovering NMP in the coating process of the lithium ion battery according to claim 1, wherein the gas-gas heat exchanger cools NMP waste gas to 60-70 ℃.
4. The device for recycling NMP in the coating process of the lithium ion battery according to claim 1, wherein the surface cooler cools the NMP waste gas to 10-20 ℃.
5. The device according to claim 1, wherein the air-air heat exchanger heats the air delivered by the air return fan to 55-65 ℃.
6. The apparatus according to claim 1, wherein the electric heater heats the air to 90-140 ℃.
7. The NMP recovery apparatus for lithium ion battery coating process according to claim 1, wherein the gas received from the surface air cooler by the gas-gas heat exchanger and the exhaust fan accounts for 90% and 10% of the total gas amount, respectively.
8. The apparatus for recovering NMP in the coating process of a lithium ion battery according to claim 1, wherein the concentrated NMP gas accounts for 1 to 3% of the total amount of gas entering the separation membrane module.
9. The device for recycling NMP in the coating process of the lithium ion battery according to claim 1, further comprising a recycling liquid tank and a liquid discharge pump, wherein the recycling liquid tank is connected with the surface cooler and used for recycling the NMP condensed by the surface cooler, and the liquid discharge pump is connected with the recycling liquid tank and used for discharging the NMP in the recycling liquid tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122120564.7U CN215842408U (en) | 2021-09-03 | 2021-09-03 | Lithium ion battery coating process NMP recovery unit |
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| CN202122120564.7U CN215842408U (en) | 2021-09-03 | 2021-09-03 | Lithium ion battery coating process NMP recovery unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116409839A (en) * | 2023-06-12 | 2023-07-11 | 东莞市鹏锦机械科技有限公司 | NMP waste liquid purification system and technology |
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2021
- 2021-09-03 CN CN202122120564.7U patent/CN215842408U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116409839A (en) * | 2023-06-12 | 2023-07-11 | 东莞市鹏锦机械科技有限公司 | NMP waste liquid purification system and technology |
| CN116409839B (en) * | 2023-06-12 | 2023-08-08 | 东莞市鹏锦机械科技有限公司 | NMP waste liquid purification system and technology |
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