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            Knowledge Explanation of Foshan Spray Painting Factory: General Treatment Method of Spray Painting E
            Category: Industry Information
            Date: 2019-08-08
            Click: 912
            Author: admin
            Spray painting technology is widely used in machinery, electrical equipment, household appliances, automobiles, ships, furniture and other industries.

            Spray painting technology is widely used in machinery, electrical equipment, household appliances, automobiles, ships, furniture and other industries. Spray paint raw materials - paint is composed of non-volatile and volatile components, non-volatile components include film-forming substances and auxiliary film-forming substances, volatile components refer to solvents and diluents (mainly xylene).

            Organic gases in spray paint exhaust come from volatilization of solvent and diluent. Organic solvents will not adhere to the surface of spray paint with paint, and will be released completely during spray painting and curing process to form organic exhaust gas. Among them, the amount of volatile dimethylbenzene waste gas accounts for about 30% of the diluent dosage, and another 70% volatilizes in the drying process.

            The two-phase suspended solvents formed by atomization of coatings and solvents in spray painting operations diffuse into the surrounding air and pollute the air. The collection and separation of paint mist in polluted air is an important method to improve the quality of spray paint, improve the environment of spray paint and meet the requirements of environmental protection.

            Waste Gas Treatment Technology of Spray Painting Plant in Foshan

            Paint spraying exhaust gas mainly consists of two parts, one is liquid paint mist, the other is gaseous volatile organic compounds (VOC). For liquid paint mist, it is necessary to use paint mist removal device, but for insoluble VOC, industrial mature technology should still be "activated carbon adsorption + photocatalytic oxidation desorption combined waste gas purification system".

            1. Dry paint mist filtration and purification device

            At present, 80% of spray rooms in developed countries in Europe and the United States adopt dry paint mist purification. The important reason lies in the comprehensive consideration of environmental protection. In addition, dry paint mist purification also shows great advantages in ensuring spray paint performance, purification efficiency, reducing secondary pollution, reducing operating costs, etc.

            2. Activated Carbon Waste Gas Purification Processing Unit

            Activated carbon waste gas purifier is a dry waste gas treatment equipment. The utility model is composed of a box body and an adsorption unit packed in the box body. According to the number of adsorption units and air volume, different specifications can be combined. Activated carbon waste gas purifier can select different fillers to treat a variety of different waste gases, mainly for the purification of organic waste gases such as paint. For the exhaust gas whose concentration is less than 1 000 mg/m3, the discharge after purification meets GB16297-1996 Comprehensive Emission Standard of Air Pollutants. The main advantages of activated carbon adsorption device are high adsorption efficiency, low operation cost, convenient maintenance, and the ability to simultaneously treat a variety of mixed waste gases.

            3. Photocatalytic oxidation purification device

            Because activated carbon has the characteristics of regeneration, in the case of large amount of activated carbon, high concentration of waste gas and short saturation time of activated carbon adsorption, activated carbon desorption device can be used for regeneration and recycling of activated carbon (the desorption medium can use steam). Using activated carbon desorption device can not only save operation cost, but also recover adsorbed waste gas, and avoid secondary pollution.

            In the absence of solvent recovery, photocatalytic oxidation of activated carbon regeneration device can also be used for regeneration and recycling of activated carbon. The nanometer photocatalytic catalyst material (GC-100) in the core of this device is a kind of material which can absorb light energy and produce catalytic reaction on its surface. Its function is similar to chlorophyll of plants. The photocatalytic oxidation-reduction reaction takes place on the surface of photocatalyst materials when ultraviolet light irradiates them at a specific nano-wavelength.

            Photocatalytic catalysts absorb photons and produce electrons (E-) and holes (H+) on their surfaces. They convert the absorbed light into chemical energy, that is, they have photocatalytic activity. When the photocatalytic catalyst material contacts with water in the air, the surface adsorbs H_2, O_H-, H_2 and O_H-are oxidized by holes (H+), O_2 is reduced by electrons (E-), and the oxidation ability of OH-groups is strong, which makes the organic matter oxidize and finally decompose into water and CO_2.

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