Organic gas recovery system of upper layer oven of coating machine

Abstract

The invention relates to an organic gas recovery system of an upper layer oven of a coating machine, the organic gas recovery system comprises a first exhaust fan, a gas-gas heat exchanger, a recovery tower, a second exhaust fan, a first circulating device, a second circulating device, a first heat exchanger and a second heat exchanger. The recovery tower comprises a first recovery device and a second recovery device positioned at the upper part of the first recovery device. The first recovery device is internally provided with a first accommodating cavity and a first adsorption device. The second recovery device is internally provided with a second accommodating cavity and a second adsorption device. The first circulation device is respectively communicated with the first accommodating cavity and a space above the first adsorption device in the first recovery device. The second circulation device is respectively communicated with the second accommodating cavity and a space above the second adsorption device in the second recovery device. The recovery system uses the recovery tower to adsorb organic gases in a gas twice, and the adsorption is more complete. The gas flowing from the oven to the recovery tower exchanges heat with the gas flowing out of the recovery tower after adsorption treatment, and the temperature of the gas entering the oven is increased.

Description

technical field [0001] The invention relates to the field of organic gas recovery, in particular to an organic gas recovery system for an upper layer oven of a coating machine. Background technique [0002] N-Methyl-2-pyrrolidone (1-methyl-2-pyrrolidone, NMP for short), colorless transparent liquid, boiling point 204°C, flash point 95°C, low viscosity, slight ammonia smell, chemical and thermal stability Good, high polarity, low volatility, miscible with water in any ratio and so on. [0003] NMP is the main component of exhaust gas emitted from the production of lithium-ion batteries. It is a toxic gas with a content of 0.06% to 0.5%. If NMP is not recycled, it will not only cause environmental pollution, but also cause a lot of waste of raw materials. Therefore, recycling and processing NMP is an important part of the green battery production process that affects environmental protection. [0004] In the existing technology, it is not disclosed how to recirculate the dis...

AI Technical Summary

Problems solved by technology

If NMP is not recycled, it will not only cause environmental pollution, but also cause a lot of waste of raw materials, so recycling NMP is an important part of the green battery production process that affects environmental protection

[0004] In the existing technology, it is not disclosed how to recirculate the discharged gas into the oven of the coating machine after discharging and recovering the organic gas such as NMP, so as to maintain the air pressure balance and keep the gas at low temperature and low humidity during reflow state, to avoid impact on the coater

Images