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Yongning FinDreams Battery NMP Recovery System

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Yongning FinDreams Battery NMP Recovery System

Yongning FinDreams Battery NMP Recovery System

Principle

The NMP waste gas discharged from the coater reaches the filter box device through the exhaust pipe for purification and filtration, and then is sent to the waste heat recovery device and then to the condensing host device for cooling and condensation. Most of the NMP in the waste gas can be condensed out and enter the waste liquid system, and the concentration of NMP in the condensed waste gas is reduced to below 300ppm.

90~95% of the low-temperature waste gas after condensation is sent to the waste heat recovery device, where it exchanges heat with the high-temperature waste gas discharged by the coating machine, and then the low-temperature waste gas is heated to meet the return air requirement and sent back to the coating machine, thus fully realizing the heat energy recovery and saving the heating energy consumption required by the coating machine.

5~10% of the low-temperature waste gas after condensation is sent to the spray tower device. The spray tower uses the characteristics that NMP can be mutually soluble with water at any ratio and has high water solubility to circularly rinse and absorb the waste gas. After the NMP concentration in the liquid phase of the tower bottom reaches the set value, it enters the waste liquid system, and the gas-liquid separator is used at the top of the tower to separate and demist, so that the NMP in the waste gas is completely absorbed, and the concentration of the discharged tail gas meets the national environmental protection requirements.

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    Project: Yongning FinDreams Battery NMP Recovery System (PJ22070101)
    Customer required parameter Equipment parameter
    Air volume 220000m³/h Equipment model Treatment capacity Absorption tower Heat recovery equipment Emission concentration of
    exhaust gas
    Production line (number of
    cathode and anode lines)    		 3 two-layer cathode coating machines Diameter Height Tower shell material Core material
    NMP liquid concentration ≥90% PJNMP22W 220000m³/h φ1600 14400 Stainless steel Aluminium alloy fin 20mg/m³
    Heat-exchange efficiency ≥80%
    Emission standard of NMP gas ≤20mg/m³
    Space occupation 400㎡
    Structure: excess heat recovery + condenser + water absorption tower
    Engineering characteristics: This project was a fully automatic large air volume NMP recovery system. Highly efficient excess heat recovery and effective heat exchange of exhaust and return air were achieved. NMP waste liquid was sufficiently recovered using low-temperature condensation method. The exhaust gas was treated by water absorption method to meet emission standard. G4+F8 filter was used to guarantee cleanliness of equipment and return air.