Purifying device for paint spraying organic waste gas and solvent recovering method thereof

Abstract

The invention discloses a purifying device for paint spraying organic waste gas. The purifying device comprises a paint mist removing device, an oil stain filter, a cooler, a fan, a purifying tank, a condenser and an oil-water separator connected in sequence, wherein the paint mist removing device comprises a paper filter, a cyclone dust collector and a bag-type dust collector; the inlet of the paper filter is connected with an organic solvent waste gas pipe of a paint room; the outlet of the paper filter is connected with the inlet of the cyclone dust collector; the outlet of the cyclone dust collector is connected with the inlet of the bag-type dust collector; and the outlet of the bag-type dust collector is connected the oil stain filter. Due to the adoption of the device, the paint mist removing capability is greatly improved, active carbon is prevented from being polluted, and the recovering purity of an organic solvent is increased simultaneously. The invention further discloses a method for recovering an organic solvent by using the purifying device. The method comprises the following steps of: removing paint mist and oil stains; cooling and absorbing organic solvent waste gas; desorbing with water steam; condensing; and separating oil and water, wherein in the step for removing the paint mist, paint mist is effectively removed after being turned into paint powder; and the process of the method is reasonable, and contributes to saving energy and labor sources.

Description

technical field [0001] The invention relates to the technical field of purification of organic waste gas from painting and recovery of organic solvents, in particular to a purification device for organic waste gas from painting and a method for recovering organic solvents using the device. Background technique [0002] The painting process is widely used in machinery, electrical equipment, home appliances, automobiles, ships, furniture and other industries. Spray paint raw materials are composed of non-volatile and volatile components. Non-volatile components include film-forming substances and auxiliary film-forming substances. Volatile components refer to curing agents and diluents. Diluents are added to reduce resin viscosity and improve its process performance. It is a liquid substance with good miscibility with resin. Adding a curing agent is to promote the rapid drying of the paint, increase the adhesion and strength of the paint surface, and improve the chemical stabi...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a purification device and a solvent recovery method for organic waste gas from spray paint, the purpose of which is to overcome the low demisting efficiency existing in the purification of organic solvent waste gas from spray paint, the replacement of filter paper and cloth bags affecting the operation efficiency of equipment, and the low purity of organic solvent recovery. High, activated carbon is prone to failure, etc.

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