NMP control and recovery: measures in lithium battery production
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2023/11/18 14:17:45
The NMP recovery process is designed to control and recover NMP waste gas from lithium battery production, recover and purify NMP through steps such as condensation and activated carbon adsorption to improve resource utilization and reduce environmental pollution.
NMP recycling process flow chart:
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The following is a brief description of the NMP recycling process flow:
The exhaust gas of the coater (120 ° C) is first heat exchanged with the return air through the condenser, and the intake air temperature is cooled to about 55 ° C, so that part of the NMP is condensed and recovered.
The gas from condenser 1 is further passed through condenser 2 and condenser 3, and the temperature is further reduced to about 25 ° C to further recover NMP.
A small amount of uncondensed gas is treated with an activated carbon adsorption tower to further remove residual NMP.
After treatment, the exhaust gas is returned to the condenser 1, and the heat exchange is carried out with the inlet air of the coater, and then discharged through the high altitude.
The condensed waste gas enters the activated carbon adsorption tower, and the organic matter in it is adsorbed by activated carbon.
After the activated carbon reaches saturation, hot air is used to regenerate the activated carbon, and the regenerated activated carbon generates high concentration of NMP gas, which goes into the condensing tower together with the production waste gas for condensation and recovery of NMP.
In order to ensure that NMP exhaust gas emissions meet the standards, the treatment efficiency of the activated carbon adsorption device should reach more than 90%. Test and evaluate the adsorption capacity of activated carbon regularly, and replace activated carbon in time to ensure stable emission of NMP exhaust gas.
At the same time, it is necessary to strengthen production management, regularly overhaul the waste gas treatment device, and immediately stop production when abnormal conditions are found to eliminate abnormal emissions.
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