Spray paint organic solvent waste gas purifying device and solvent recycling method

Abstract

The invention discloses a spray paint organic solvent waste gas purifying device and a solvent recycling method. The spray paint organic solvent waste gas purifying device comprises a paper filter, a cyclone dust collector, a venturi mixer, a cloth-bag dust collector, a foam dust collector, a high-pressure fan, an adsorption tank, a condenser and a specific gravity separator. The solvent recycling method is characterized in that the viscose small particles of paint mist are solidified into paint powder with small viscosity by adopting the paper filter to provide a given dwell time, the dust is primarily removed through the cyclone dust collector, the powder particles with small viscosity are formed, the viscose paint mist is mixed with the lime powder inside the venturi mixer so as to remove the viscosity of the paint mist, then the paint mist enters the cloth-bag dust collector so as to filter the paint powder, organic waste gas containing trace paint powder enters the foam dust collector, the paint powder is removed by utilizing the foam principle, the organic waste gas is fed into the adsorption tank to be adsorbed and desorbed, and finally the pure organic solvent can be obtained in a cooling and separating manner. The method has the characteristics of reasonability and compactness in process connection and high dust removal efficiency.

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...

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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

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