CN101543683B - Method for reclaiming NMP in working procedure of coating lithium ion cell - Google Patents
Method for reclaiming NMP in working procedure of coating lithium ion cell Download PDFInfo
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- CN101543683B CN101543683B CN 200910068390 CN200910068390A CN101543683B CN 101543683 B CN101543683 B CN 101543683B CN 200910068390 CN200910068390 CN 200910068390 CN 200910068390 A CN200910068390 A CN 200910068390A CN 101543683 B CN101543683 B CN 101543683B
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- heat exchanger
- blower fan
- coating machine
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Abstract
The invention discloses a method for reclaiming NMP in working procedure of coating a lithium ion cell. The device for reclaiming the NMP in the working procedure of coating the lithium ion cell consists of an air inlet fan, a heat exchanger, a precooler, an aftercooler, an NMP absorption cistern, an exhaust fan, a circulating fan, a heater and a pole sheet coating machine which are sequentially connected by pipelines; an exhaust port of the coating machine is connected with the middle part of the heat exchanger; and the bottom of the heat exchanger is connected with the circulating fan. The exhaust fan of the coating machine is started and sends out hot air of exhaust gas containing the NMP; and the hot air sequentially enters each part of the device for realizing the reclaiming of the NMP. The device has simple and easy-understanding structure and convenient operation, improves the reclaiming efficiency of the NMP, avoids the leakage of the NMP, realizes zero emission and has important significance on ensuring the performance of the cell, reducing the production cost and improving the production efficiency.
Description
Technical field
The present invention relates to the NMP recovery method of the recovery production process, particularly a kind of working procedure of coating lithium ion cell of a kind of electrodes of lithium-ion batteries NMP (n-formyl sarcolysine base two pyrrolidones).
Background technology
Lithium ion battery have voltage height, specific energy high, recycle often, advantage such as memory time is long; Not only on portable electric appts, be used widely like mobile phone, DV and laptop computer; And be widely used in big-and-middle-sized electrical equipment aspects such as electric automobile, electric bicycle and electric tool, therefore increasingly high to the performance requirement of lithium ion battery.NMP is a kind of important material in the lithium ion battery production process, and it is as raw-material a kind of carrier, before production in the lithium ion battery production process; NMP is added in the slurry as a kind of raw material; And NMP is evaporated through high temperature and directly is discharged in the atmosphere in process of production, and NMP has very strong corrosivity as a kind of chemical raw material; If directly be discharged in the atmosphere, can cause serious pollution to environment on every side.And the NMP purchasing price is expensive, about about 30,000 yuan 1 ton greatly.Our the NMP retracting device that adopts has that organic efficiency is low, NMP reveals serious and problem such as equipment fault is frequent at present.The NMP recovery system is utilized the physical characteristic of NMP; Adopt freezing and VOC runner combined recovery mode reclaims fully, the VOC runner adopts import molecular sieve runner, and runner is separated into 3 zones; One is that treatment region, one are that cooling zone, one are the desorption districts; The VOC runner is rotation slowly in the course of the work, contains gas that organic solvent need handle from becoming the gas of relative clean after treatment region flows through, and the content of organic solvent reduces in the gas after the processing.The air that another part contains organic solvent flows through from the cooling zone under the effect of regeneration blower fan; After being heated to certain temperature then; Flow through from the rotary wheel regeneration zone, because the rotary wheel regeneration zone is reproduced air heat, the organic solvent evaporation that is adsorbed on regeneration zone comes out to take away with regeneration air.In runner when work,, regeneration air and the ratio of handling air be at 1/5 (5 times of cycles of concentration), and the concentration of organic solvent can be 6 times of concentration before handling in the regeneration air.After waste gas is concentrated to certain concentration, utilize freezing just can make the NMP condensing and recycling.Can not keep in repair ordinary life 5 years but the VOC runner is domestic.The micropore of the at present used a great deal of molecular sieve filling of VOC adsorption runner is seriously stopped up by a large amount of dust in the medium and various chemical tar; Regeneration is difficulty very; Its regeneration effect is also to the utmost low; Cause the NMP rate of recovery low, handled and be discharged into through the NMP retracting device and contain pungent taste (in the sky cold time become white vaporific attitude) in the air of atmosphere, and condense into liquid NMP at exhaust outlet and drip.And equipment body adopts to make in advance and is assemblied to form, and the air channel is adopted galvanized iron to bend and is spliced.Because its congenital Design and Machining problem has caused the pipeline (especially on exhaust duct) of NMP retracting device also to have the NMP that condenses to leak (basic reason, early stage, runner NMP separated out, due to the rate of recovery is low) in working order down; And the body interior of equipment does not adopt the technology of full weld, causes equipment body serious from the leakage of pipe flange connector when shutting down.
Summary of the invention
The objective of the invention is to overcome shortcoming of the prior art, a kind of NMP in working procedure of coating lithium ion cell recovery method is provided.
Technical scheme of the present invention:
A kind of NMP in working procedure of coating lithium ion cell retracting device; Absorbing water tower, air draft blower fan, circulating fan, heater and pole piece coating machine by air intake blower fan, heat exchanger, preceding surface cooler, rear surface cooling device, NMP connects to form through pipeline successively; Said coating machine exhaust outlet connects the heat exchanger middle part, and the heat exchanger bottom connects circulating fan.
A kind of above-mentioned NMP in working procedure of coating lithium ion cell retracting device is characterized in that: all pipelines of this retracting device all adopt stainless steel pipes, and all weld with flange seal.
A kind of above-mentioned NMP in working procedure of coating lithium ion cell retracting device is characterized in that: all air channel flanges of this retracting device all adopt soft polytetrafluoroethylene (PTFE) with the pad that is connected of flange, and spacer thickness is about 2mm.
A kind of NMP in working procedure of coating lithium ion cell recovery method uses above-mentioned retracting device, carries out according to following step:
A. when the exhaust blower of coating machine starts and sees the waste gas hot blast that contains NMP off, start the retracting device air intake blower fan, the outlet temperature of air intake blower fan is set between 25-30 ℃, and the cold wind of air intake blower fan gets into heat exchanger; The cold wind that the waste gas hot blast that contains NMP at first gets into heat exchanger and air intake blower fan carries out heat exchange, makes the waste gas hot blast temperature that contains NMP reduce by 30 ℃;
B. surface cooler and recirculated water carry out heat exchange before getting into then, make the waste gas hot blast temperature that contains NMP reduce by 20 ℃;
C. get into rear surface cooling device and cold water at last and carry out heat exchange, exhaust temperature drops to 20～30 ℃;
D. last tail gas gets into tail gas and absorbs water tower, returns coating machine after the most of gas heater via heating in top, absorption tower, and remaining gas is disposed to atmosphere.
Advantage of the present invention is: simple in structure understandable, easy to operate, improved the NMP organic efficiency, and stopped the NMP leakage, realize zero-emission, significant to guaranteeing battery performance, reduce production costs and enhancing productivity.Energy saving of system of the present invention has been abandoned runner adsorption technology traditional, high energy consumption, takes exclusive vent gas treatment technology and tail gas to absorb water tower, has greatly reduced energy consumption, has improved organic efficiency; In addition, improved absorption tower discharging gas can guarantee that aneroid carries secretly, so partial discharge gas can return coating machine after waste heat recovery, the energy consumption that makes coating machine is obviously reduced.
Description of drawings
Fig. 1 is a NMP in working procedure of coating lithium ion cell retracting device sketch map of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done and to further describe.
As shown in Figure 1, this device is made up of air intake blower fan 1, heat exchanger 2, preceding surface cooler 3, rear surface cooling device 4, air draft blower fan 5, NMP absorption water tower 6, circulating fan 7, heater 8, pole piece coating machine 9.The intermediate duct connection is connect by the stainless steel full weld to be formed.All air channel flanges of this retracting device all adopt soft polytetrafluoroethylene (PTFE) with the pad that is connected of flange, and spacer thickness is about 2mm.
NMP in working procedure of coating lithium ion cell recovery method of the present invention uses above-mentioned retracting device, carries out according to following step:
A. when the exhaust blower of coating machine starts and sees the waste gas hot blast that contains NMP off, start the retracting device air intake blower fan, the outlet temperature of air intake blower fan is set between 25-30 ℃, and the cold wind of air intake blower fan gets into heat exchanger; The cold wind that the waste gas hot blast that contains NMP at first gets into heat exchanger and air intake blower fan carries out heat exchange, makes the waste gas hot blast temperature that contains NMP reduce by 30 ℃;
B. surface cooler and recirculated water carry out heat exchange before getting into then, make the waste gas hot blast temperature that contains NMP reduce by 20 ℃;
C. get into rear surface cooling device and cold water at last and carry out heat exchange, exhaust temperature drops to 20～30 ℃;
D. last tail gas gets into tail gas and absorbs water tower, returns coating machine after the most of gas heater via heating in top, absorption tower, and remaining gas is disposed to atmosphere.
The course of work: pole piece coating machine 9 produces the hot-air that contains NMP and delivers to heat exchanger 2 and carry out heat exchange, and wherein the cold wind in the heat exchanger 2 and the wind that returns from the NMP absorption tower add and passes through 7 circulating fans and heater 8 in the coating machine inner loop together.The hot-air that another part contains NMP through heat exchange 2 after, surface cooler 3 and rear surface cooling device 4 before getting into have a large amount of NMP to condense in these two parts and separate out; The remaining afterwards tail gas that contains NMP absorbs water tower through NMP tail gas; Use the water-soluble characteristic of NMP, NMP is fully absorbed at water tower 6 places, discharge the air that does not contain NMP; Whole process can turn down air draft 5 valves and air intake blower fan 1 front end valve; Form relative closed-loop system, make in the system air, reach very high saving and recovering effect near own self-sustaining.And system adopts the stainless steel full weld to connect composition, thereby the run, drip, leak phenomenon no longer occurs.
Claims (1)
1. working procedure of coating lithium ion cell n-formyl sarcolysine base two pyrrolidones recovery methods; It is characterized in that; Use working procedure of coating lithium ion cell n-formyl sarcolysine base two pyrrolidones retracting devices; Said retracting device absorbs water tower, air draft blower fan, circulating fan, heater and pole piece coating machine by air intake blower fan, heat exchanger, preceding surface cooler, rear surface cooling device, NMP and connects to form through pipeline successively, and said coating machine exhaust outlet connects the heat exchanger middle part, and the heat exchanger bottom connects circulating fan; Carry out according to following step:
A. when the exhaust blower of coating machine starts and sees the waste gas hot blast of nitrogenous methyl two pyrrolidones off, start the retracting device air intake blower fan, the outlet temperature of air intake blower fan is set between 25-30 ℃, and the cold wind of air intake blower fan gets into heat exchanger; The cold wind that the waste gas hot blast of nitrogenous methyl two pyrrolidones at first gets into heat exchanger and air intake blower fan carries out heat exchange, makes the waste gas hot blast temperature of nitrogenous methyl two pyrrolidones reduce by 30 ℃;
B. surface cooler and recirculated water carry out heat exchange before getting into then, make the waste gas hot blast temperature of nitrogenous methyl two pyrrolidones reduce by 20 ℃;
C. get into rear surface cooling device and cold water at last and carry out heat exchange, exhaust temperature drops to 20～30 ℃;
D. last tail gas gets into tail gas and absorbs water tower, returns coating machine after the most of gas heater via heating in top, absorption tower, and remaining gas is disposed to atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200910068390 CN101543683B (en) | 2009-04-07 | 2009-04-07 | Method for reclaiming NMP in working procedure of coating lithium ion cell |
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| CN 200910068390 CN101543683B (en) | 2009-04-07 | 2009-04-07 | Method for reclaiming NMP in working procedure of coating lithium ion cell |
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| CN101543683A CN101543683A (en) | 2009-09-30 |
| CN101543683B true CN101543683B (en) | 2012-12-05 |
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| CN 200910068390 Expired - Fee Related CN101543683B (en) | 2009-04-07 | 2009-04-07 | Method for reclaiming NMP in working procedure of coating lithium ion cell |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102120098A (en) * | 2011-01-24 | 2011-07-13 | 宁波伊司达锂电池有限公司 | Device and method for recycling N-methylpyrrolidone in process of producing lithium battery |
| CN104107616A (en) * | 2014-08-14 | 2014-10-22 | 叶大煜 | NMP (N-Methyl Pyrrolidone) gas treating equipment and treating process thereof |
| CN105148684A (en) * | 2015-08-15 | 2015-12-16 | 慈溪市赛思德环保科技有限公司 | Novel spray equipment |
| CN105797420A (en) * | 2016-03-23 | 2016-07-27 | 东莞塔菲尔新能源科技有限公司 | NMP gas recovery system and technology thereof |
| 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 |
| CN106390684B (en) * | 2016-09-21 | 2019-03-26 | 苏州迈沃环保工程有限公司 | Utilize the method for NMP in high boiling solvent gas recovery |
| CN108057311A (en) * | 2018-01-26 | 2018-05-22 | 叶大煜 | A kind of NMP gas processing devices and its treatment process |
| CN113788776B (en) * | 2021-09-03 | 2023-03-24 | 深圳市德尼环境技术有限公司 | Lithium ion battery coating procedure NMP purification method and system |
| CN113786701A (en) * | 2021-09-03 | 2021-12-14 | 深圳市德尼环保技术有限公司 | Method and system for recovering NMP in lithium ion battery coating procedure |
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| US5006138A (en) * | 1990-05-09 | 1991-04-09 | Hewitt J Paul | Vapor recovery system |
| CN1962028A (en) * | 2006-10-26 | 2007-05-16 | 清华大学 | Method for reclaiming methylene chloride from waste gas |
| CN201006541Y (en) * | 2007-02-09 | 2008-01-16 | 深圳市信宇人科技有限公司 | Coating machine bake oven |
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2009
- 2009-04-07 CN CN 200910068390 patent/CN101543683B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5006138A (en) * | 1990-05-09 | 1991-04-09 | Hewitt J Paul | Vapor recovery system |
| CN1962028A (en) * | 2006-10-26 | 2007-05-16 | 清华大学 | Method for reclaiming methylene chloride from waste gas |
| CN201006541Y (en) * | 2007-02-09 | 2008-01-16 | 深圳市信宇人科技有限公司 | Coating machine bake oven |
Non-Patent Citations (2)
| Title |
|---|
| 周伟波.锂电池电极涂布机NMP废气处理回收工艺改进与施工.《中国科技信息》.2007,(第8期),28-30. |
| 锂电池电极涂布机NMP废气处理回收工艺改进与施工;周伟波;《中国科技信息》;20070430(第8期);1.工艺概况部分内容和图2 * |
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