First, paint organic waste gas treatment equipment introduction
Painting process is widely used in machinery, electrical equipment, home appliances, automobiles, ships, furniture and other industries。
Paint materials - Paint is composed of non-volatile components and volatile components, non-volatile components include film forming substances and auxiliary film forming substances, volatile components refer to solvents and diluents (mainly xylene)。Spray paint exhaust from organic gasesThe volatilization of the solvent and diluent and the organic solvent will not be attached to the surface of the spray paint with the paint, and will be released to form organic exhaust gas during the spray painting and curing process。
在The amount of xylene exhaust gas volatilized in the spray painting process accounts for about 30% of the amount of diluent, and another 70% is volatilized in the drying process, and the paint and solvent atomization in the spray painting operationThe resulting two-phase suspended matter escapes into the surrounding air and pollutes the air。The collection and separation of paint mist in polluted air is the main method to improve the quality of spray painting, improve the spray painting environment and meet the requirements of environmental protection emission。
Second, spray paint waste gas treatment technology
Paint spraying exhaust gas is mainly composed of two parts, one is liquid paint fog, and the other is gaseous VOC。For liquid paint mist, it is necessary to use paint mist removal device;However, for the VOC of insoluble water, the industrial mature technology should still be "activated carbon adsorption + photocatalytic oxidation desorption combined waste gas purification system".。
1, dry paint mist filter purification device
At present, 80% of the paint spray rooms in developed countries in Europe and the United States are purified by dry paint mist, an important reason is the comprehensive consideration of environmental protection。In addition, dry paint mist purification also shows great advantages in ensuring paint performance, purification efficiency, reducing secondary pollution, and reducing operating costs。
2, activated carbon waste gas purification device
Activated carbon exhaust gas purifier is a dry exhaust gas treatment equipment。It is composed of a box and an adsorption unit packed in the box。According to the number of adsorption units and air volume can be different specifications of the combination, activated carbon exhaust gas purifier choose different fillers can deal with a variety of different waste gas, mainly used for paint and other organic waste gas purification。For the concentration of exhaust gas less than 1000mg/m3 after purification discharge meet the GB16297-1996 "Comprehensive Emission Standard of Air Pollutants"。
This equipment is an activated carbon adsorption device, which needs to be used together with an activated carbon regeneration system (using nano photocatalytic oxidation device)。The main advantages of activated carbon adsorption device are: high adsorption efficiency, low operating cost, easy maintenance, and can simultaneously deal with a variety of mixed waste gases。
3, photocatalytic oxidation purification device
Since activated carbon has the characteristics of regeneration, in the case of large amount of activated carbon, high concentration of waste gas and short adsorption and saturation time of activated carbon, activated carbon desorption device can be used to recycle activated carbon (the desorption medium can use steam).。The use of activated carbon desorption device can not only save operating costs, but also recover the adsorbed waste gas and avoid secondary pollution。In the absence of solvent recovery, the photocatalytic oxidation activated carbon regeneration device can also be used to recycle activated carbon
