There are five main methods of spray painting exhaust gas treatment: painting exhaust gas treatment activated carbon adsorption, spray exhaust gas treatment catalytic combustion, spray exhaust gas treatment washing absorption and direct combustion paint exhaust gas treatment, ion spray exhaust gas treatment.

Advantages and Disadvantages of the Above Five Methods for Spray Painting Waste Gas:

First, paint exhaust gas treatment activated carbon adsorption method

High operating costs and high maintenance costs; the organic solvents contained in the exhaust gas can be recovered and utilized. When the activated carbon is regenerated, the equipment covers a large area, the energy consumption is large, and the cost is high; when the exhaust gas temperature of the drying room needs to be higher, the cooling needs to be performed first. When there is a large amount of paint mist in the spray room exhaust gas, the paint mist needs to be removed first. Applicable for the treatment of paint exhaust gas at normal temperature, low concentration and relatively small amount of exhaust gas.

Second, paint exhaust gas treatment catalytic combustion method

Exhaust gas treatment efficiency is high and the installation area is small; it consumes less energy than the direct combustion method. The impurities in the exhaust gas should be removed to prevent catalyst poisoning; when the catalyst is used for a long time, the efficiency of the waste gas treatment is reduced accordingly; the cost of the waste gas treatment equipment is high. Applicable to high temperature, small flow, spray paint concentration high, containing impurities less occasions. Exhaust gas treatment applications in the drying room are more.

Third, painting exhaust gas treatment washing absorption method

Spray paint exhaust gas treatment equipment is low in cost and covers a small area; it can handle a large amount of exhaust gas; there is no danger of explosion, fire, etc., and the safety is good. Compared with other methods, spray paint exhaust gas treatment efficiency is relatively low; the waste gas components in the scrubbing absorbing liquid need to be treated twice; the selection of paint exhaust gas purification deodorant needs to be determined based on the main solvent in the exhaust gas. It is applicable to the occasions where the temperature is low, the amount of exhaust gas is large, and the treatment of mixed exhaust gas in the drying room and spray booth. Fourth, paint exhaust gas treatment direct combustion method Spray paint exhaust gas treatment efficiency is high, the general exhaust gas after burning, that is to achieve the discharge standard; paint exhaust gas treatment reliability. However, there is a lot of preheat energy, high cost; need to consider safety measures such as explosion-proof, heat exchanger, combustion chamber design is more complex. Suitable for the treatment of exhaust gas with high organic solvent content and high temperature.

Fifth, photocatalytic paint exhaust gas treatment method

The defect of high operating cost of the traditional activated carbon adsorption method has been completely changed, the purification efficiency is high, the operation is stable, the safety factor is high, and there is no defect in the replacement of consumables. Suitable for low concentration, high volume spray paint exhaust treatment.

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