CN217391969U - Dichloromethane recovery system for wet lithium battery diaphragm device - Google Patents
Dichloromethane recovery system for wet lithium battery diaphragm device Download PDFInfo
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- CN217391969U CN217391969U CN202221263624.9U CN202221263624U CN217391969U CN 217391969 U CN217391969 U CN 217391969U CN 202221263624 U CN202221263624 U CN 202221263624U CN 217391969 U CN217391969 U CN 217391969U
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- Prior art keywords
- adsorption tower
- compressor
- dichloromethane
- gas
- lithium battery
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- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 title claims abstract description 176
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 19
- 238000011084 recovery Methods 0.000 title claims abstract description 11
- 238000001179 sorption measurement Methods 0.000 claims abstract description 75
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 239000012528 membrane Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000001035 drying Methods 0.000 claims abstract description 17
- 238000005273 aeration Methods 0.000 claims abstract description 10
- 239000007791 liquid phase Substances 0.000 claims abstract description 4
- 239000012071 phase Substances 0.000 claims abstract description 4
- 238000004064 recycling Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000005057 refrigeration Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000002351 wastewater Substances 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 35
- 238000000926 separation method Methods 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 239000002912 waste gas Substances 0.000 description 7
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 229920000049 Carbon (fiber) Polymers 0.000 description 5
- 239000004917 carbon fiber Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 238000003795 desorption Methods 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
Images
Classifications
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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
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses a dichloromethane recovery system for a wet lithium battery diaphragm device, which comprises a drying box exhaust fan, wherein the outside of an exhaust body of the drying box is connected with a first compressor and a second compressor, the first compressor and the second compressor are both connected with an external gas-liquid separator, and a heat exchanger is arranged between the gas-liquid separator and the second compressor; the outside of the gas-liquid separator is connected with a water cooler, the outlet of the precooler is connected with a membrane module, and the membrane module is connected with a first adsorption tower, a second adsorption tower and a third adsorption tower which are connected with the outside in parallel; the gas phase outlets of the first adsorption tower, the second adsorption tower and the third adsorption tower are connected with an external chimney, and the liquid phase outlets of the first adsorption tower, the second adsorption tower and the third adsorption tower are connected with the layering tank and the aeration tank. The operation cost of the system is greatly reduced, the recovery rate of the dichloromethane can reach more than 99.9 percent, and no other environmental pollutants such as waste water, waste liquid, waste residue and the like are generated.
Description
Technical Field
The utility model belongs to the technical field of the separation, specifically with compression condensation membrane separation and resin adsorption technique realize among wet process lithium battery diaphragm device dichloromethane retrieve and discharge to reach standard.
Background
A large amount of dichloromethane-containing waste gas is generated in a drying section in the production process of a wet lithium battery diaphragm, the discharge amount of dichloromethane is about 400kg/h calculated according to 40m/s-50m/s of each line, currently, domestic and foreign manufacturers generally adopt an activated carbon adsorption and desorption technology or a carbon fiber adsorption and desorption technology, the dichloromethane-containing waste gas discharged from a drying box enters an activated carbon or carbon fiber adsorption tower through an exhaust fan, the tower for adsorbing dichloromethane is desorbed by steam, the desorbed gas containing dichloromethane and water vapor enters a condenser, dichloromethane is recovered by condensing water at 7 ℃, and the uncondensed dichloromethane gas returns to an inlet for re-adsorption, but the following defects exist:
1. because the dichloromethane content in the waste gas from the drying box is high, the adsorption and analysis efficiency of the activated carbon or the carbon fiber is greatly reduced after half a year to one year, the dichloromethane in the exhaust gas seriously exceeds the standard, a large amount of dichloromethane is discharged into the atmosphere, and the activated carbon or the carbon fiber needs to be replaced;
2. a large amount of steam is consumed in the adsorption and desorption processes, and a large amount of chilled water is needed by the condenser, so that the system is high in energy consumption and running cost, and the energy consumption is 1000 yuan/h/line;
3. condensing the resolved steam into waste water;
4. the exhaust gas quantity from the drying box is 4000m3/h, and the exhaust gas quantity is increased to 8000m 3/h/line after the air is supplemented by the dilution fan and the drying fan.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a compression condensation membrane separation resin adsorption technology realizes that wet process lithium electricity diaphragm dichloromethane retrieves and discharge to reach standard technology to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a process for recycling and discharging dichloromethane of a wet lithium battery diaphragm by a compression condensation membrane separation resin adsorption technology comprises a drying box exhaust fan, a compressor I, a compressor II, a gas-liquid separator, a cooler, an air return pipe, a water cooler, a storage tank I, a precooler, a condenser, a refrigerating unit I, a membrane assembly, an adsorption tower I, an adsorption tower II, an adsorption tower III, a layering tank, an aeration tank and an exhaust chimney, wherein exhaust gas of the drying box exhaust fan enters the compressor I and the compressor II through a filter, a gas-liquid mixture at the outlet of the compressor I and the outlet of the compressor II enters the gas-liquid separator, a liquid phase of the gas-liquid separator is cooled by a heat exchanger and then returns to the compressor, a gas phase of the gas-liquid separator enters the water cooler, a large amount of dichloromethane is condensed by the water cooler and enters the dichloromethane storage tank I, and uncondensed gas enters the condenser through a preheater, a large amount of dichloromethane is condensed by the condenser and enters a dichloromethane storage tank II, uncondensed gas serving as a refrigerant enters the precooler and enters the membrane assembly after heat exchange, gas penetrating through the membrane assembly returns to an inlet of the compressor, the content of dichloromethane in the gas not penetrating through the membrane assembly is extremely low, the gas enters the first adsorption tower and the second adsorption tower, the gas is adsorbed and then discharged up to the standard, the adsorption tower is used circularly after being analyzed by water vapor, the analyzed dichloromethane and water enter the layering tank for separation, and the separated water enters the aeration tank for treatment.
As a further aspect of the present invention: the exhaust pipeline is provided with a first dichloromethane concentration detector, and the exhaust pipeline is provided with a second dichloromethane concentration detector.
As a further aspect of the present invention: and the liquid of the gas-liquid separator is cooled by the heat exchanger and then returns to the first compressor and the second compressor for recycling.
As a further aspect of the present invention: and the liquid output end of the water cooler is connected to the first liquid storage tank through a pipeline.
As a further aspect of the present invention: and gas at the outlet of the membrane module I is divided into two paths, one path returns to the inlet of the compressor, and the other path enters the resin adsorption tower I and the resin adsorption tower II.
As a further aspect of the present invention: the three liquids of the adsorption tower enter a layering tank
As a further aspect of the present invention: the compressor adopts a low-temperature high-efficiency single-screw compressor, water plays a role in cooling and lubricating and is similar to isothermal compression, the temperature of the outlet of the compressor rises to about 20 ℃, and the compressor is made of stainless steel.
As a further aspect of the present invention: the gas membrane separator adopts a gas dissolving permeable membrane.
As a further aspect of the present invention: the adsorption tower adopts polymer resin.
As a further aspect of the present invention: and the adsorption tower adopts steam for desorption.
The utility model has the advantages that: the utility model discloses the dichloromethane recovery system of invention adopts the composite technology of compression + condensation + membrane separation + resin adsorption, retrieves the dichloromethane in the exhaust waste gas of drying cabinet and gets off and recycle, and the dichloromethane content in the gas is less than 20mg/Nm3, accords with discharge to reach standard requirement, shows through the experimental data concrete:
1. the operation cost is greatly reduced, compared with the prior imported carbon fiber device, the operation cost is reduced by 92 percent, and is reduced from 2300 yuan/h to 180 yuan/h;
2. the problem of large amount of waste gas emission is solved, and the total amount of the discharged gas is reduced to 4000m3/h from 16000m 3/h;
3. the recycling of dichloromethane is realized, and the recovery rate reaches more than 99.9 percent;
4. the content of dichloromethane in the discharged gas reaches the national discharge standard of 20mg/Nm 3;
5. the device does not produce other environmental pollutants such as waste water, waste liquid, waste residue and the like;
drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a flow chart of a device for realizing wet-process recovery of lithium battery diaphragm dichloromethane by a compression condensation membrane separation technology.
In the figure: the system comprises a drying box exhaust fan 1, a compressor I2, a compressor II 3, a heat exchanger 4, a gas-liquid separator 5, a water cooler 6, a storage tank I7, a precooler 8, a condenser 9, a storage tank II 10, a refrigerating unit 11, a membrane component 12, an adsorption tower I13, an adsorption tower II 14, an adsorption tower III 15, a layering tank 16, an aeration tank 17 and an exhaust chimney 18.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, in the embodiment of the present invention, a wet lithium battery separator dichloromethane recovery device is implemented by using a compression condensation membrane separation technology, and the device includes a drying box exhaust fan 1, a compressor i 2, a compressor ii 3, a gas-liquid separator 5, a cooler 4, a water cooler 6, a storage tank i 7, a precooler 8, a condenser 9, a storage tank ii 10, a refrigerating unit 11, a membrane module 12, an adsorption tower 13, an adsorption tower 14, an adsorption tower 15, a layering tank 16, an aeration tank 17, and an exhaust chimney 18, wherein exhaust gas of the drying box exhaust fan 1 enters the compressor i 2 and the compressor ii 3 through a filter, a gas-liquid mixture at outlets of the compressor i 2 and the compressor ii 3 enters the gas-liquid separator 5, a liquid phase of the gas-liquid separator 5 returns to the compressor 2 after being cooled by the heat exchanger 4, a gas phase of the gas-liquid separator 5 enters the water cooler 6, a large amount of dichloromethane is condensed by the water cooler 6 and enters the dichloromethane storage tank i 7, uncondensed gas enters a condenser 9 through a preheater 8, a large amount of dichloromethane is condensed in the condenser 9 and enters a dichloromethane storage tank II 10, the uncondensed gas serving as a refrigerant enters a precooler 8, gas at an outlet of the precooler 8 enters a membrane module 12, gas penetrating the membrane module 12 returns to an inlet of a compressor 2, gas not penetrating the membrane module 12 enters a first adsorption tower 13, a second adsorption tower 14 and a third adsorption tower 15, the gas is discharged to an exhaust chimney 18 after being adsorbed, dichloromethane and condensed water resolved by the adsorption tower enter a layering tank 16, separated water enters an aeration tank 17, and the water is discharged to sewage treatment after being aerated.
A dichloromethane concentration detector I is arranged in an exhaust pipeline in the system, and a dichloromethane concentration detector II is arranged in the exhaust pipeline.
And the liquid in the gas-liquid separator 5 is cooled by the heat exchanger 4 and then returns to the first compressor 2 and the second compressor 3 for recycling.
And the liquid output end of the water cooler 8 is connected to the first storage tank 7 through a pipeline.
The gas at the outlet of the membrane module 12 is divided into two paths, wherein one path returns to the inlet of the compressor I2, and the other path enters the adsorption tower I13, the adsorption tower II 14 and the adsorption tower III 15.
The outlets of the first adsorption tower 13, the second adsorption tower 14 and the third adsorption tower 15 enter a layering tank 16 aeration tank 17.
The first compressor 2 and the second compressor 3 adopt low-temperature high-efficiency single-screw compressors, the low-temperature high-efficiency single-screw compressors are approximately in isothermal compression, the temperature rise of the outlet of the compressors is 18-22 ℃, the temperature rise is mostly about 20 ℃, the compressor is made of stainless steel, the membrane component 12 adopts a gas dissolution permeable membrane, the first adsorption tower 13, the second adsorption tower 14 and the third adsorption tower 15 adopt high-polymer adsorption resin, and the first adsorption tower 13, the second adsorption tower 14 and the third adsorption tower 15 adopt water vapor for analysis.
The working principle is as follows: the dichloromethane-containing waste gas from the exhaust fan 1 of the drying box enters the inlets of a compressor I2 and a compressor II 3, the compressor I2 and the compressor II 3 automatically operate and self-adapt the working frequency to be balanced with the air intake quantity, the inlet pressure is kept stable at a micro-positive pressure, the waste gas is lifted to 0.85MPaG by the compressor pressure and then enters a water cooler 6, a large amount of dichloromethane is condensed and enters a storage tank, uncondensed gas passes through a precooler 8 and then enters a condenser 9, a large amount of dichloromethane can be condensed and enters a storage tank II 10 by the condenser 9, the uncondensed gas serving as a cold source enters the precooler 8, is heated by the inlet air and then enters a gas membrane module 12 for further separation, the permeated gas rich in dichloromethane returns to the inlets of the compressor 2 and the compressor 3 for recompression and recovery, the non-permeated gas enters adsorption towers 13, 14 and 15, and the dichloromethane concentration of the gas after adsorption is less than 20mg/Nm3, and (3) discharging the waste water to a chimney (18), resolving the adsorption tower by using steam, allowing resolved dichloromethane and condensed water to enter a layering tank (16), allowing separated water to enter an aeration tank (17), and discharging the water to a sewage system after aeration.
The foregoing is merely exemplary and illustrative of the structure of the invention, and various modifications, additions and substitutions as described in the detailed description may be made by those skilled in the art without departing from the structure or exceeding the scope of the invention as defined in the claims.
Claims (10)
1. Wet process lithium electricity diaphragm device dichloromethane recovery system, its characterized in that: the drying box exhaust fan comprises a drying box exhaust fan (1), wherein a first compressor (2) and a second compressor (3) are connected to the outside of the drying box exhaust fan (1), the first compressor (2) and the second compressor (3) are both connected with an external gas-liquid separator (5), and a heat exchanger (4) is arranged between the gas-liquid separator (5) and the second compressor (3);
the outside of the gas-liquid separator (5) is connected with a water cooler (6), one end of the water cooler (6) is connected with a first storage tank (7) for storing condensed dichloromethane, the other end of the water cooler is connected with an external precooler (8), the outside of the precooler (8) is connected with a condenser (9), and the outside of the condenser (9) is connected with a second storage tank (10);
the outlet of the precooler (8) is connected with a membrane module (12), and the membrane module (12) is connected with a first adsorption tower (13), a second adsorption tower (14) and a third adsorption tower (15) which are connected with the outside in parallel;
the gas phase outlets of the first adsorption tower (13), the second adsorption tower (14) and the third adsorption tower (15) are connected with an external exhaust chimney (18) and used for discharging gas reaching the standard, and the liquid phase outlets of the first adsorption tower (13), the second adsorption tower (14) and the third adsorption tower (15) are connected with a layering tank (16) and an aeration tank (17) and used for treating the resolved dichloromethane and water.
2. The system for recycling dichloromethane of a wet lithium battery separator device according to claim 1, wherein the liquid in the gas-liquid separator (5) is cooled by the heat exchanger (4) and then returned to the first compressor (2) and the second compressor (3) for recycling.
3. The system for recovering dichloromethane of a wet-process lithium battery diaphragm device according to claim 1, characterized in that the liquid output end of the precooler (8) is connected to the inlet of the first storage tank (7) through a pipeline.
4. The system for recycling methylene dichloride of a wet lithium battery membrane device according to claim 1, wherein two sets of gas pipelines are arranged at the outlet of the membrane module (12), wherein one set is connected with the inlet of the compressor I (2), and the other set is connected with the inlets of the adsorption tower I (13), the adsorption tower II (14) and the adsorption tower III (15).
5. The wet lithium battery separator device dichloromethane recovery system of claim 1, wherein the outlets of the first adsorption column (13), the second adsorption column (14) and the third adsorption column (15) are connected to the inlet of the layering tank (16).
6. The system for recycling dichloromethane of the wet-process lithium battery separator device according to claim 1, wherein the first compressor (2) and the second compressor (3) adopt low-temperature high-efficiency single-screw compressors, the temperature of the outlet of each compressor rises to 18-22 ℃, and the compressor is made of stainless steel.
7. The system for recycling methylene chloride of a wet lithium battery separator device according to claim 1, wherein the membrane module (12) is a gas-dissolving permeable membrane.
8. The system for recovering dichloromethane in a wet lithium battery separator device according to claim 1, wherein the first adsorption tower (13), the second adsorption tower (14) and the third adsorption tower (15) are internally filled with polymeric adsorption resin.
9. The system for recycling dichloromethane of a wet lithium battery separator device according to claim 1, wherein a first dichloromethane concentration detector is arranged in an exhaust pipeline of the system, and a second dichloromethane concentration detector is arranged in the exhaust pipeline.
10. The system for recycling dichloromethane of a wet lithium battery separator device according to claim 1, wherein a refrigeration unit (11) is arranged outside the condenser (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221263624.9U CN217391969U (en) | 2022-05-24 | 2022-05-24 | Dichloromethane recovery system for wet lithium battery diaphragm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221263624.9U CN217391969U (en) | 2022-05-24 | 2022-05-24 | Dichloromethane recovery system for wet lithium battery diaphragm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217391969U true CN217391969U (en) | 2022-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221263624.9U Ceased CN217391969U (en) | 2022-05-24 | 2022-05-24 | Dichloromethane recovery system for wet lithium battery diaphragm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217391969U (en) |
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2022
- 2022-05-24 CN CN202221263624.9U patent/CN217391969U/en not_active Ceased
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| IW01 | Full invalidation of patent right | ||
| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20230612 Decision number of declaring invalidation: 562148 Granted publication date: 20220909 |