A kind of spray paint organic solvent waste gas purification device and solvent recovery method

Abstract

The invention discloses a device for purifying waste gas of spray paint organic solvents and a method for solvent recovery, which comprises a paper filter, a cyclone dust collector, a Venturi mixer, a cloth bag dust collector, a water foam dust collector, a high-pressure fan, and an adsorption tank sequentially connected , condenser and specific gravity separator, the method adopts paper filter to provide a certain residence time to solidify the viscous fine particles of paint mist into less viscous paint powder, and then go through the cyclone dust collector for initial dust removal and form less viscous powder particles, The viscous paint mist is mixed with lime powder in the Venturi mixer to remove the viscosity of the paint mist, and then enters the bag filter to filter out the paint powder. The organic waste gas containing traces of paint powder is finally removed by the water foam dust collector using the principle of water foam. It is sent to the adsorption tank for adsorption and desorption, and the pure organic solvent is obtained after cooling and separation. The process connection is reasonable and compact; the dust removal efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of recycling organic solvent waste gas from spray paint, and more specifically relates to a device for purifying waste gas from paint spray organic solvent and a solvent recovery method. Background technique [0002] The painting process is widely used in machinery, electrical equipment, home appliances, automobiles, ships, furniture and other industries. Raw materials for spray paint—the coating is composed of non-volatile and volatile components. The non-volatile components include film-forming substances and auxiliary film-forming substances. The volatile components refer to curing agents and diluents. And the added liquid substance with good miscibility with the resin, the addition of curing agent is to promote the rapid drying of the paint, increase the adhesion and strength of the paint surface, and improve the chemical stability of the paint. Paint spray exhaust gas is mainly composed of volatile cur...

AI Technical Summary

Problems solved by technology

[0003] Another Chinese patent number is: CN201110311140.7 discloses a paint spraying organic solvent exhaust gas recovery device, including a paint mist removal device, a fan, an adsorption tank, a condenser and an oil-water separator connected in sequence, and the paint mist removal device includes The gas collection tank, the cyclone dust collector and the bag filter for temporarily storing the organic solvent waste gas are connected in sequence. The organic solvent method, which sequentially includes the steps of paint mist removal, adsorption, water vapor desorption, condensation, and oil-water separation. However, when the organic waste gas enters the adsorption tank, the device and method have a high dust content and are easy to adhere to the surface of activated carbon. And block the pores of activated carbon, make the activated carbon invalid, affect the adsorption efficiency of activated carbon and the purity of product recovery

Images