CN107638777A - NMP recovery pipes optimization system in a kind of lithium battery production - Google Patents
NMP recovery pipes optimization system in a kind of lithium battery production Download PDFInfo
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- CN107638777A CN107638777A CN201711040234.9A CN201711040234A CN107638777A CN 107638777 A CN107638777 A CN 107638777A CN 201711040234 A CN201711040234 A CN 201711040234A CN 107638777 A CN107638777 A CN 107638777A
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- nmp
- absorption tower
- lithium battery
- battery production
- heat exchanger
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Abstract
The present invention relates to lithium battery production technical field, NMP recovery pipes optimization system in particularly a kind of lithium battery production, including coating machine, the coating machine is connected by exhaust duct with the first heat exchanger, exhaust blower is provided with the exhaust duct, first heat exchanger is connected with absorption tower top, absorption tower bottom respectively by gas pipeline, and the absorption tower top is connected with water inlet pipe, and the absorption tower bottom is connected by waste liquid circulation pipe with absorption tower top；The absorption tower bottom is connected by circulating pump with NMP intermediate buffer tanks, and the absorption tower bottom is provided with purity detecting instrument.After said structure, the process gas after the present invention is handled absorption tower is reused through waste-heat recoverer with entering the baking oven of return coating machine after the heat exchanger in coating machine pipe process exchanges heat；The solenoid electric valve and overflow pipe of bypass are added, the risk of the NMP leakages occurred before taking precautions against.
Description
Technical field
The present invention relates to lithium battery production technical field, NMP recovery pipes optimization system in particularly a kind of lithium battery production
System.
Background technology
Painting process is the critical process of whole electrokinetic cell in current Li electricity enterprises, and the raw material being related to and technology are difficult
Point and the emphasis of numerous lithium electricity enterprise technologys tackling key problem.Power battery anode coating process in, raw material solvent NMP because
Price is so expensive unlike other positive electrode, while to binding agent PVDF dissolved dilution effect during positive pole closes slurry
Very well, therefore usage amount is very big.The entitled N- methyl pyrrole network alkanone of NMP chemistry, its volatility, permeability are extremely strong and hygroscopic,
It can be mixed in any proportion with water.NMP is easy to pole piece to separate as slurrying medium after the completion of coating.Traditional way of recycling is
The gaseous air of NMP containing high temperature is cooled after water condensation liquefaction through gas-liquid heat-exchange and is collected, but this recovery
Efficiency comparison is low, and cooling is also insufficient.Maximum of which drawback is that NMP gaseous exhausts have certain pollution to environment, and cold
But there is very long pipeline distance in retort, middle accumulating tank and final recycling can, therefore NMP risk of leakage greatly increases.
The U of Chinese utility model patent CN 205692906 disclose a kind of NMP in working procedure of coating lithium ion cell energy-conservation recovery
Device, including coating machine, heat exchanger, runner, it is characterised in that：Heat exchanger includes heat exchanger high temperature inlet, heat exchange
Device low-temperature outlet, heat exchanger dry air entrance, the outlet of heat exchanger dry air, two sides of coating machine or so be provided with coater head,
Tail is coated with, exhaust duct, exhaust duct connection exhaust blower are provided with above coating machine, exhaust blower connects heat by exhaust duct and handed over
Parallel operation high temperature inlet, coating machine lower section are provided with air supply duct, air supply duct connection breeze fan, and breeze fan passes through air supply duct
The outlet of heat exchanger dry air is connected, runner is provided with adsorption zone, desorption area and waste heat recovery area, adsorption zone the right and left difference
It is provided with organic solvent adsorption zone pipeline, pure air pipeline.
The content of the invention
The technical problem to be solved in the invention, which is to provide in a kind of lithium battery production, can effectively reduce NMP disclosure risks
Recovery pipe optimizes system.
In order to solve the above technical problems, NMP recovery pipes optimization system in a kind of lithium battery production of the present invention, including apply
Cloth machine, the coating machine are connected by exhaust duct with the first heat exchanger, and exhaust blower, institute are provided with the exhaust duct
State the first heat exchanger by gas pipeline respectively with absorption tower top, absorption tower bottom to be connected, the absorption tower top connects
Water inlet pipe is connected to, the absorption tower bottom is connected by waste liquid circulation pipe with absorption tower top；The absorption tower bottom passes through
Circulating pump is connected with NMP intermediate buffer tanks, and the absorption tower bottom is provided with purity detecting instrument.
Further, the absorption tower bottom is connected by waste liquid into and out of pipeline with the second heat exchanger.
Further, second heat exchanger by entering, water return pipeline is connected with cooling tower.
Further, it is provided with stop valve on the connecting line between circulating pump and NMP the intermediate buffer tank.
Further, fluid level controller is provided with the NMP intermediate buffers tank, the NMP intermediate buffers pot bottom leads to
Piping is connected with the final hold-up tank tops of NMP, on the pipeline between the final hold-up tank of the NMP intermediate buffers tank and NMP
It is provided with stop valve.
Further, the NMP intermediate buffers tank upper end is connected by overflow passage with the final hold-up tank upper ends of NMP
Connect, magnetic valve is provided with the overflow passage.
Further, the final hold-up tank lower ends of the NMP are connected with barreled recovery pipe and lorry recovery pipe.
Further, it is provided with purity detecting instrument in the NMP intermediate buffers tank.
After said structure, the present invention through waste-heat recoverer and enters coating machine to the process gas after the processing of absorption tower
Heat exchanger in pipe process returns to coating machine baking oven after being exchanged heat is reused；Add the solenoid electric valve of bypass
And overflow pipe, the risk of the NMP leakages occurred before taking precautions against.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is the structured flowchart that NMP recovery pipes optimize system in a kind of lithium battery production of the present invention.
In figure：1 is coating machine, and 2 be the first heat exchanger, and 3 be absorption tower bottom, and 4 be absorption tower top, and 5 be the second heat
Interchanger, 6 be cooling tower, and 7 be circulating pump, and 8 be stop valve, and 9 be NMP intermediate buffer tanks, and 10 be fluid level controller, and 11 be electromagnetism
Valve, 12 be the final hold-up tanks of NMP
Embodiment
As shown in figure 1, NMP recovery pipes optimization system in a kind of lithium battery production of the present invention, including coating machine 1, institute
State coating machine 1 by exhaust duct with the first heat exchanger 2 to be connected, be provided with exhaust blower on the exhaust duct, described
One heat exchanger 2 is connected with absorption tower top 4, absorption tower bottom 3 respectively by gas pipeline, and the absorption tower top 4 connects
Water inlet pipe is connected to, the absorption tower bottom 3 is connected by waste liquid circulation pipe with absorption tower top 4；The absorption tower bottom 3 is logical
Cross circulating pump 7 with NMP intermediate buffers tank 9 to be connected, the absorption tower bottom 3 is provided with purity detecting instrument.First by coating machine 1
NMP used heat air (about 120 DEG C) is pumped to first heat exchanger 2 through centrifugal blower in coater oven, with absorption tower top 4
(about 35 DEG C) after handling qualified technique lack of gas and carrying out heat exchange, the waste gas of (about 65 DEG C) enters absorption tower bottom 3 after cooling,
With tower top circulation fluid counter current contacting, wherein most NMP is absorbed.Enter coating machine 1 by a part of lack of gas after heat exchange simultaneously
Baking oven in continue to circulate.A small amount of unabsorbed NMP waste gas enters absorption tower top 4 in absorption tower bottom 3, is followed with tower top
Ring liquid counter current contacting, absorb remaining NMP waste gas.Wherein in order that circulation fluid constantly produces, bypass is needed by absorption tower
Pure water is continuously replenished in the water inlet pipe that portion 4 connects.Purity detecting instrument is also equipped with the NMP intermediate buffers tank 9, so can also
The purity of NMP liquid in NMP intermediate buffers tank 9 is detected by purity detecting instrument, if cataclysm occurs for its purity, illustrates pipeline
Generation disclosure risk, is alarmed by system, so as to carry out related maintenance.
Further, the absorption tower bottom 3 is connected by waste liquid into and out of pipeline with the second heat exchanger 5.Described
Two heat exchangers 5 are by entering, water return pipeline is connected with cooling tower 6.Company between circulating pump 7 and NMP the intermediate buffers tank 9
Adapter is provided with stop valve 8 on road.
Further, fluid level controller 10, the bottom of NMP intermediate buffers tank 9 are provided with the NMP intermediate buffers tank 9
Portion is connected by the pipeline top of hold-up tank 12 final with NMP, between the final hold-up tank 12 of the NMP intermediate buffers tank 9 and NMP
Pipeline on be provided with stop valve.The upper end of NMP intermediate buffers tank 9 passes through overflow passage and the final upper ends of hold-up tank 12 of NMP
It is connected, magnetic valve 11 is provided with the overflow passage, the final lower ends of hold-up tank 12 of NMP is connected with barreled recovery pipe
With lorry recovery pipe.
The NMP waste liquids for there was only 60% purity in absorption tower bottom 3 also have certain temperature, enter in second heat exchanger 5,
Cooling tower 6 constantly water inlet and backwater, to enable the steady operation of second heat exchanger 5, and the NMP waste liquids after cooling return to suction
Receive in tower bottom 3.NMP waste liquids in absorption tower bottom 3 can enter absorption tower top 4 by circulation line, by continuous
Circulation counter current contacting, the lifting of further purity.After purity reaches design load 80%, purity detecting instrument sends signal, follows
Ring pump 7 is opened, and the NMP liquid with certain purity is entered in NMP10 ton NMP intermediate buffers tank 9 by normally opened stop valve 8.
NMP10 ton NMP intermediate buffers tank 9 only has LT fluid level controllers 10 as intermediate storage tank in original design, due to actual production
The middle flow and flow rate into NMP10 ton NMP intermediate buffers tank 9 is more than the flow for being back to the final hold-up tanks 12 of NMP50 tons NMP
And flow velocity, plus starting setting up the Liquid level of NMP10 ton NMP intermediate buffers tank 9 90%, to the anti-of operating personnel and equipment
It is too short between seasonable, there is the risk of leakage of NMP liquid in operation usually.Therefore overflow pipe crossing is devised in bypass, and set
Magnetic valve 11 is put, once the liquid level of LT fluid level controllers 10 of NMP10 ton NMP intermediate buffers tank 9 reaches 90%, not only opens backflow
To the final pipelines of hold-up tank 12 of 50 tons of NMPNMP, while overflow passage can be opened, and carry out prompting pre-warning signal, directly carried
Show to operating personnel or testing staff, can effectively prevent leakage from influenceing environment.As the NMP liquid being recovered to is continuously increased,
It is stored in the final hold-up tanks 12 of NMP50 tons NMP.Small-sized lithium electric power Battery Company can carry out recovery 60-80% using barreled
The NMP liquid of purity, but as the continuous release of lithium electricity production capacity, the final hold-up tanks 12 of 50 tons of NMP can also be store in 1 month
It is full, the labor intensity of original artificial barreled recovery pipe increase employee, and also have the risk of leakage.At original 50 tons most
Be provided with lorry recovery pipe on whole storage tank 12, and can timing lorry reclaim nmp solution, for further third party is special later
Industry company purifies nmp solution, plays efficient and safe mode of operation.
Although the foregoing describing the embodiment of the present invention, those skilled in the art should be appreciated that this
Be merely illustrative of, various changes or modifications can be made to present embodiment, without departing from the present invention principle and essence,
Protection scope of the present invention is only limited by the claims that follow.
Claims (8)
1. NMP recovery pipes optimization system in a kind of production of lithium battery, including coating machine, the coating machine by exhaust duct with
First heat exchanger is connected, and exhaust blower is provided with the exhaust duct, it is characterised in that：First heat exchanger passes through
Gas pipeline is connected with absorption tower top, absorption tower bottom respectively, and the absorption tower top is connected with water inlet pipe, the absorption
Tower bottom is connected by waste liquid circulation pipe with absorption tower top；The absorption tower bottom passes through circulating pump and NMP intermediate buffers
Tank is connected, and the absorption tower bottom is provided with purity detecting instrument.
2. optimize system according to NMP recovery pipes in a kind of lithium battery production described in claim 1, it is characterised in that：It is described
Absorption tower bottom is connected by waste liquid into and out of pipeline with the second heat exchanger.
3. optimize system according to NMP recovery pipes in a kind of lithium battery production described in claim 2, it is characterised in that：It is described
Second heat exchanger is by entering, water return pipeline is connected with cooling tower.
4. optimize system according to NMP recovery pipes in a kind of lithium battery production described in claim 1, it is characterised in that：It is described
Stop valve is provided with connecting line between circulating pump and NMP intermediate buffer tanks.
5. optimize system according to NMP recovery pipes in a kind of lithium battery production described in claim 1, it is characterised in that：It is described
Fluid level controller is provided with NMP intermediate buffer tanks, the NMP intermediate buffers pot bottom passes through pipeline and the final hold-up tanks of NMP
Top is connected, and stop valve is provided with the pipeline between the final hold-up tank of the NMP intermediate buffers tank and NMP.
6. optimize system according to NMP recovery pipes in a kind of lithium battery production described in claim 5, it is characterised in that：It is described
NMP intermediate buffer tank upper ends are connected by overflow passage with the final hold-up tank upper ends of NMP, and electricity is provided with the overflow passage
Magnet valve.
7. optimize system according to NMP recovery pipes in a kind of lithium battery production described in claim 5, it is characterised in that：It is described
The final hold-up tank lower ends of NMP are connected with barreled recovery pipe and lorry recovery pipe.
8. optimize system according to NMP recovery pipes in a kind of lithium battery production described in claim 1, it is characterised in that：It is described
Purity detecting instrument is provided with NMP intermediate buffer tanks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711040234.9A CN107638777A (en) | 2017-10-30 | 2017-10-30 | NMP recovery pipes optimization system in a kind of lithium battery production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711040234.9A CN107638777A (en) | 2017-10-30 | 2017-10-30 | NMP recovery pipes optimization system in a kind of lithium battery production |
Publications (1)
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| CN107638777A true CN107638777A (en) | 2018-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711040234.9A Pending CN107638777A (en) | 2017-10-30 | 2017-10-30 | NMP recovery pipes optimization system in a kind of lithium battery production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113491928A (en) * | 2021-07-27 | 2021-10-12 | 中材锂膜有限公司 | Oily coating waste gas treatment process and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201466101U (en) * | 2009-07-07 | 2010-05-12 | 天津力神电池股份有限公司 | Lithium ion battery coating procedure NMP reclaimer |
| CN203196729U (en) * | 2013-03-12 | 2013-09-18 | 玉溪大红山矿业有限公司 | Ore pulp guiding device with ore-overflowing prevention function |
| CN203469768U (en) * | 2013-08-01 | 2014-03-12 | 韶关市曲江天瑞德化工有限公司 | Novel high-efficiency and energy-saving air treatment device with two-stage spraying and absorbing system for organic waste gas |
| CN207507218U (en) * | 2017-10-30 | 2018-06-19 | 中航锂电（江苏）有限公司 | NMP recovery pipe optimization systems in a kind of lithium battery production |
-
2017
- 2017-10-30 CN CN201711040234.9A patent/CN107638777A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201466101U (en) * | 2009-07-07 | 2010-05-12 | 天津力神电池股份有限公司 | Lithium ion battery coating procedure NMP reclaimer |
| CN203196729U (en) * | 2013-03-12 | 2013-09-18 | 玉溪大红山矿业有限公司 | Ore pulp guiding device with ore-overflowing prevention function |
| CN203469768U (en) * | 2013-08-01 | 2014-03-12 | 韶关市曲江天瑞德化工有限公司 | Novel high-efficiency and energy-saving air treatment device with two-stage spraying and absorbing system for organic waste gas |
| CN207507218U (en) * | 2017-10-30 | 2018-06-19 | 中航锂电（江苏）有限公司 | NMP recovery pipe optimization systems in a kind of lithium battery production |
Non-Patent Citations (1)
| Title |
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| 赵舜华;宋锡瑾;: "聚氨酯合成革生产中 N,N-二甲基甲酰胺的回收利用", 化工环保, no. 05 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113491928A (en) * | 2021-07-27 | 2021-10-12 | 中材锂膜有限公司 | Oily coating waste gas treatment process and device |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 213200 Jiangdong Avenue 1, Jintan District, Jiangsu, Changzhou Applicant after: AVIC lithium Technology Co.,Ltd. Address before: 213200 Jintan District, Changzhou City, Jiangsu Province, Jiangdong Road No. Applicant before: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Applicant after: AVIC lithium Technology Co.,Ltd. Address before: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Applicant before: AVIC lithium Technology Co.,Ltd. Address after: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Applicant after: Zhongchuangxin Aviation Technology Co.,Ltd. Address before: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Applicant before: AVIC lithium Technology Co.,Ltd. |
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| CB02 | Change of applicant information |