CN113786701A - Method and system for recovering NMP in lithium ion battery coating procedure - Google Patents
Method and system for recovering NMP in lithium ion battery coating procedure Download PDFInfo
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- CN113786701A CN113786701A CN202111032142.2A CN202111032142A CN113786701A CN 113786701 A CN113786701 A CN 113786701A CN 202111032142 A CN202111032142 A CN 202111032142A CN 113786701 A CN113786701 A CN 113786701A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/229—Integrated processes (Diffusion and at least one other process, e.g. adsorption, absorption)
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a method and a system for recovering NMP in a coating procedure of a lithium ion battery, belonging to the field of NMP recovery, wherein the method for recovering the NMP comprises the following steps: s1: primary condensation; s2: primary separation; s3: separating again; s4: condensing again; s5: obtaining NMP; s6: and discharging and recycling waste gas. The NMP recovery system comprises a precooling surface cooler, a first separation membrane component, a second separation membrane component, a vacuum condenser and a recovery liquid tank; the precooling surface cooler is connected with the first separation membrane assembly; the first separation membrane assembly is connected with the second separation membrane assembly and the vacuum condenser; the second separation membrane assembly is connected with the vacuum condenser, and the second separation membrane assembly is connected with a recovery assembly and an external discharge port; the vacuum condenser is connected with the recovery liquid tank and is connected with a vacuum pump; the recovery liquid tank is connected with a liquid discharge pump. The invention can simplify the system structure, is convenient for recovery, improves the purity of the recovered liquid and reduces the consumption of power energy.
Description
Technical Field
The invention relates to the technical field of NMP recovery, in particular to a method and a system for recovering NMP 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 air which flows back after being processed by the first and second surface air coolers and enters the coating machine is preheated and recycled by a preheating and recycling device, and is sent into the coating machine after being heated (about 65 ℃) by utilizing high-temperature exhaust air of a coating oven. 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. 90% of the air flows back to the coating machine oven through the waste heat recovery device, the fan and the electric heater.
And (3) rotary wheel adsorption concentration: for the remaining 10% of gas, in order to further recover the NMP in the mixed gas and make it reach the emission standard, the NMP in the cooled mixed air is adsorbed and concentrated by a VOC (volatile organic compound) zeolite rotating wheel, and the NMP in the concentrated mixed air is refluxed to the front end of the surface cooler to be condensed and precipitated.
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 structure is complicated and is not convenient for recovery, the recovery liquid contains much water, the purity is low, the cost of the zeolite rotating wheel is high, and a large amount of electric power is consumed for regeneration and heating of the zeolite rotating wheel. 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.
Disclosure of Invention
The invention aims to provide a method and a system for recovering NMP in a coating process of a lithium ion battery, which can simplify the structure of the system, facilitate recovery, improve the purity of a recovered solution and reduce the consumption of kinetic energy so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for recovering NMP in a coating procedure of a lithium ion battery comprises the following steps:
s1: performing primary condensation, namely condensing the high-temperature waste gas containing the NMP through a precooling surface cooler to obtain the NMP;
s2: the first separation is to pass the waste gas after passing through the precooling surface cooler through a first separation membrane component to separate a first permeation gas and a first residual gas;
s3: separating again, namely passing the first residual gas through a second separation membrane component to separate a second permeate gas and a second residual gas;
s4: condensing again, namely condensing the first permeating gas and the second permeating gas through a vacuum condenser to obtain NMP;
s5: obtaining NMP, namely conveying the NMP condensed by the precooling surface cooler and the vacuum condenser to a recovery liquid tank;
s6: and (3) discharging and recycling waste gas, namely dividing the second residual seepage gas separated by the second separation membrane component into two paths, wherein one path of the second residual seepage gas is discharged into the atmosphere through an exhaust fan through an outer discharge port, and the other path of the second residual seepage gas is recycled through the recycling component.
The invention can simplify the system structure, is convenient for recovery, improves the purity of the recovered liquid and reduces the consumption of power energy.
As a further scheme of the invention: in S4, the vacuum condenser pumps out the residual permeate gas after condensation by a vacuum pump and delivers it to an inlet of the second separation membrane module.
This setting guarantees that remaining permeate gas can separate once more, and then makes the NMP rate of recovery higher.
As a still further scheme of the invention: in S6, one path of the retentate gas discharged to the atmosphere accounts for 10% of the total amount of the second retentate gas, and the other path of the retentate gas for recycling accounts for 90% of the total amount of the second retentate gas.
This setting ensures that the residual gas that oozes can recycle, and then reduces energy loss.
As a still further scheme of the invention: in S6, the specific process of recycling the recycling component is: conveying the recycled residual gas to an electric heater through a return air induced draft fan and a coating oven circulating fan, heating the residual gas by the electric heater, and conveying the heated residual gas to the coating oven to produce the high-temperature waste gas containing the NMP.
This setting can be retrieved the conveying of infiltration residual air and give the coating oven and recycle.
As a still further scheme of the invention: the electric heater heats the residual gas to 90-140 ℃.
The heated and reused residual gas enters a coating oven and then can continuously generate NMP high-temperature waste gas.
A lithium ion battery coating procedure NMP recovery system comprises a precooling surface cooler, a first separation membrane component, a second separation membrane component, a vacuum condenser and a recovery liquid tank;
the precooling surface cooler is connected with the first separation membrane assembly;
the first separation membrane assembly is connected with the second separation membrane assembly and the vacuum condenser;
the second separation membrane assembly is connected with the vacuum condenser, the second separation membrane assembly is connected with a recovery assembly and an outer discharge port, and an exhaust fan is connected between the outer discharge port and the second separation membrane assembly;
the vacuum condenser is connected with the recovery liquid tank and is connected with a vacuum pump;
the recovery liquid tank is connected with a liquid discharge pump.
Compared with the prior art, the NMP recovery system not only simplifies the structure and is convenient to recover, but also can reduce the cost and energy consumption by replacing a zeolite rotating wheel with a separation membrane component.
As a still further scheme of the invention: the recycling assembly comprises a return air draught fan connected with the second separation membrane assembly, the return air draught fan is connected with a coating oven circulating fan, the coating oven circulating fan is connected with an electric heater, and the electric heater is connected with a coating oven.
The recovery assembly can recycle the waste gas which needs to be discharged originally.
As a still further scheme of the invention: and a coating oven exhaust fan is connected between the coating oven and the precooling surface cooler.
The exhaust fan of the coating oven can convey the NMP-containing high-temperature waste gas generated by the coating oven to the pre-cooling surface cooler.
Compared with the prior art, the invention has the beneficial effects that:
1. the structure is simplified, and the gas-gas heat exchanger is cancelled.
2. The NMP separation process has no phase change, and compared with a zeolite rotating wheel, the regeneration energy consumption is reduced.
3. The separation membrane module can facilitate multistage series connection and expansion according to the treatment capacity and the separation efficiency, and is convenient to transform and improve the treatment capacity.
4. Compared with the imported zeolite rotating wheel in Japan, the separation membrane component is easy to obtain.
5. The separated liquid has high purity, extremely low water content and high economic value of waste liquid recycling.
Drawings
FIG. 1 is a flow chart of a method for recovering NMP in a coating process of a lithium ion battery;
fig. 2 is a schematic structural diagram of an NMP recovery system in a coating process of a lithium ion battery.
In the figure: 1. coating an oven; 2. a coating oven exhaust fan; 3. precooling the surface cooler; 4. a first separation membrane module; 5. a second separation membrane module; 6. a vacuum condenser; 7. a vacuum pump; 8. an outer discharge port; 9. recovering the liquid tank; 10. a liquid discharge pump; 11. a circulating fan of the coating oven; 12. an electric heater; 13. a return air draught fan; 14. an exhaust fan.
Detailed Description
The present invention will be further illustrated by the following specific examples, which are carried out on the premise of the technical scheme of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a method for recovering NMP in a coating process of a lithium ion battery includes the following steps:
s1: performing primary condensation, namely condensing the high-temperature waste gas containing NMP through a precooling surface cooler 3 to obtain NMP;
s2: the primary separation is to pass the waste gas after passing through the precooling surface cooler 3 through a first separation membrane component 4 to separate a first permeation gas and a first residual gas;
s3: separating again, namely passing the first residual gas through a second separation membrane component 5 to separate a second permeate gas and a second residual gas;
s4: condensing again, namely condensing the first permeating gas and the second permeating gas through a vacuum condenser 6 to obtain NMP;
s5: obtaining NMP, namely conveying the NMP condensed by the precooling surface cooler 3 and the vacuum condenser 6 to a recovery liquid tank 9;
s6: and (3) discharging and recycling waste gas, namely dividing the second residual seepage gas separated by the second separation membrane component 5 into two paths, wherein one path is discharged into the atmosphere through an exhaust fan 14 through an outer discharge port 8, and the other path is recycled through a recycling component.
The invention not only reduces the cost, but also improves the purity of the recovered liquid and reduces the consumption of power energy.
In this embodiment: the first separation membrane module 4 and the second separation membrane module 5 both adopt organic gas separation membranes, and the organic gas separation membranes can separate NMP from air and water vapor.
In this embodiment: the vacuum condenser 6 at S4 draws out the permeate gas remaining after the condensation by a vacuum pump 7 and delivers it to the inlet of the second separation membrane module 5. This setting guarantees that remaining permeate gas can separate once more, and then makes the NMP rate of recovery higher.
In this embodiment: one path of residual gas discharged to the atmosphere at S6 accounts for 10% of the total amount of the second residual gas, and the other path of residual gas for recycling accounts for 90% of the total amount of the second residual gas. This setting ensures that the residual gas that oozes can recycle, and then reduces energy loss. In addition, the specific process of recycling the recycling assembly is as follows: the recovered residual gas is conveyed to an electric heater 12 through a return air induced draft fan 13 and a coating oven circulating fan 11, the residual gas is heated by the electric heater 12, and the heated residual gas is conveyed to a coating oven 1 to produce high-temperature waste gas containing NMP. This setting can be retrieved the conveying of surplus gas and is given coating oven 1 to recycle.
In this embodiment: the electric heater 12 heats the residual gas to 90-140 ℃. The heated and reused residual gas enters the coating oven 1 and then can continuously generate NMP high-temperature waste gas.
Referring to fig. 2, based on the above embodiment, it can be understood by those skilled in the art that the present invention further provides a system for recovering NMP in a coating process of a lithium ion battery, which includes a precooling surface cooler 3, a first separation membrane module 4, a second separation membrane module 5, a vacuum condenser 6 and a recovery liquid tank 9; the precooling surface cooler 3 is connected with a first separation membrane component 4; the first separation membrane assembly 4 is connected with the second separation membrane assembly 5 and the vacuum condenser 6; the second separation membrane component 5 is connected with a vacuum condenser 6, the second separation membrane component 5 is connected with a recovery component and an external discharge port 8, and an exhaust fan 14 is connected between the external discharge port 8 and the second separation membrane component 5; the vacuum condenser 6 is connected with a recovery liquid tank 9, and the vacuum condenser 6 is connected with a vacuum pump 7; the liquid drain pump 10 is connected to the recovery liquid tank 9 for draining the NMP liquid in the recovery liquid tank 9. Compared with the prior art, the NMP recovery system not only simplifies the structure and is convenient to recover, but also can reduce the cost and energy consumption by replacing a zeolite rotating wheel with a separation membrane component.
In this embodiment: the recovery assembly comprises a return air induced draft fan 13 connected with the second separation membrane assembly 5, the return air induced draft fan 13 is connected with a coating oven circulating fan 11, the coating oven circulating fan 11 is connected with an electric heater 12, and the electric heater 12 is connected with the coating oven 1. The recovery assembly can recycle the waste gas which needs to be discharged originally.
In this embodiment: and a coating oven exhaust fan 2 is connected between the coating oven 1 and the precooling surface cooler 3. The coating oven exhaust fan 2 can convey NMP-containing high-temperature exhaust gas generated by the coating oven 1 to the pre-cooling surface cooler 3.
The working principle is as follows: firstly, the coating oven 1 generates high-temperature waste gas containing NMP, and then the waste gas is conveyed to a precooling surface cooler 3 through a coating oven exhaust fan 2 to be condensed, so that the NMP is condensed out. Then, the waste gas after passing through the precooling surface cooler 3 passes through a first separation membrane component 4 to separate a first permeation gas and a first residual gas. And then the first residual gas passes through a second separation membrane component 5 to separate a second permeate gas and a second residual gas. Subsequently, the first permeate gas and the second permeate gas are condensed by the vacuum condenser 6, and NMP is condensed again. Meanwhile, the vacuum condenser 6 pumps out the residual permeate gas after condensation through the vacuum pump 7 and conveys the permeate gas to the inlet of the second separation membrane module 5 for re-separation. Finally, the NMP condensed by the precooling surface cooler 3 and the vacuum condenser 6 is conveyed to a recovery liquid tank 9. In addition, the second residual gas separated by the second separation membrane module 5 is divided into two paths, one path is discharged to the atmosphere through the exhaust fan 14 through the external discharge port 8, and the other path is recycled through the recycling module. The specific recycling process of the recycling assembly comprises the following steps: the recovered residual gas is conveyed to an electric heater 12 through a return air induced draft fan 13 and a coating oven circulating fan 11, the residual gas is heated by the electric heater 12, and the heated residual gas is conveyed to a coating oven 1 to produce high-temperature waste gas containing NMP.
The NMP recovery method and system not only simplify the structure, but also can recycle the high-temperature residual air return air, thereby reducing the energy consumption of the air inlet heating of the coating oven 1. And the NMP separation process has no phase change, and compared with a zeolite rotating wheel, the regeneration energy consumption is reduced. In addition, the separation membrane module can facilitate multistage series connection and expansion according to the treatment capacity and the separation efficiency, and is convenient to transform and improve the treatment capacity. Also, the separation membrane module is more readily available than the zeolite rotor imported from Japan. And the separated liquid has high purity, extremely low water content and high economic value of waste liquid recycling.
The above embodiments are only preferred embodiments 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 inventive concepts thereof according to the present invention should be equally replaced or changed within the scope of the present invention.
Claims (8)
1. A method for recovering NMP in a coating procedure of a lithium ion battery is characterized by comprising the following steps:
s1: performing primary condensation, namely condensing the high-temperature waste gas containing the NMP through a precooling surface cooler to obtain the NMP;
s2: the first separation is to pass the waste gas after passing through the precooling surface cooler through a first separation membrane component to separate a first permeation gas and a first residual gas;
s3: separating again, namely passing the first residual gas through a second separation membrane component to separate a second permeate gas and a second residual gas;
s4: condensing again, namely condensing the first permeating gas and the second permeating gas through a vacuum condenser to obtain NMP;
s5: obtaining NMP, namely conveying the NMP condensed by the precooling surface cooler and the vacuum condenser to a recovery liquid tank;
s6: and (3) discharging and recycling waste gas, namely dividing the second residual seepage gas separated by the second separation membrane component into two paths, wherein one path of the second residual seepage gas is discharged into the atmosphere through an exhaust fan through an outer discharge port, and the other path of the second residual seepage gas is recycled through the recycling component.
2. The method according to claim 1, wherein in step S4, the vacuum condenser pumps out a residual permeate gas after condensation by a vacuum pump and sends the permeate gas to an inlet of the second separation membrane module.
3. The method according to claim 1, wherein in step S6, one path of the retentate gas discharged to the atmosphere accounts for 10% of the total amount of the second retentate gas, and the other path of the retentate gas subjected to recycling accounts for 90% of the total amount of the second retentate gas.
4. The method according to claim 1, wherein in step S6, the specific process of recycling the recycling module is as follows: conveying the recycled residual gas to an electric heater through a return air induced draft fan and a coating oven circulating fan, heating the residual gas by the electric heater, and conveying the heated residual gas to the coating oven to produce the high-temperature waste gas containing the NMP.
5. The method according to claim 4, wherein the temperature of the retentate gas is raised to 90-140 ℃ by the electric heater.
6. A lithium ion battery coating process NMP recovery system is characterized by comprising a precooling surface cooler, a first separation membrane component, a second separation membrane component, a vacuum condenser and a recovery liquid tank;
the precooling surface cooler is connected with the first separation membrane assembly;
the first separation membrane assembly is connected with the second separation membrane assembly and the vacuum condenser;
the second separation membrane assembly is connected with the vacuum condenser, the second separation membrane assembly is connected with a recovery assembly and an outer discharge port, and an exhaust fan is connected between the outer discharge port and the second separation membrane assembly;
the vacuum condenser is connected with the recovery liquid tank and is connected with a vacuum pump;
the recovery liquid tank is connected with a liquid discharge pump.
7. The lithium ion battery coating procedure NMP recovery system of claim 6, wherein the recovery assembly comprises a return air induced draft fan connected with the second separation membrane assembly, the return air induced draft fan is connected with a coating oven circulating fan, the coating oven circulating fan is connected with an electric heater, and the electric heater is connected with a coating oven.
8. The system according to claim 7, wherein a coating oven exhaust fan is connected between the coating oven and the precooling surface cooler.
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| CN107400076A (en) * | 2016-05-19 | 2017-11-28 | 张建岗 | A kind of NMP in working procedure of coating lithium ion cell recovery essence steams purifying plant |
| CN107413164A (en) * | 2016-05-24 | 2017-12-01 | 中国石油化工股份有限公司 | A kind of technique and device of secondary membrane circulation and stress processing organic exhaust gas |
| CN108057311A (en) * | 2018-01-26 | 2018-05-22 | 叶大煜 | A kind of NMP gas processing devices and its treatment process |
| CN209564803U (en) * | 2018-10-11 | 2019-11-01 | 苏州迈沃环保工程有限公司 | A kind of low humidity circulation return air NMP recyclable device |
| CN110508103A (en) * | 2019-09-09 | 2019-11-29 | 南通乐尔环保科技有限公司 | A kind of method that novel UF membrane combination technique administers printing exhaust gas |
| CN112755719A (en) * | 2021-01-15 | 2021-05-07 | 浙江同善环保科技有限公司 | Efficient organic waste gas recovery device and process |
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