How to Treat Automotive Painting Exhaust Gas?
2 Answers
Use activated carbon as an adsorbent. Activated carbon adsorption devices are commonly used to purify exhaust gases containing carbon tetrachloride and vinyl chloride. Adopt appropriate absorbents to fully contact with chemical exhaust gases, allowing the absorbents to absorb the harmful substances in the exhaust, thereby purifying the exhaust gas. Increase the exhaust gas pressure or decrease the exhaust gas temperature to condense some easily condensable harmful substances in the chemical exhaust into liquid, separating them from the exhaust gas.
There are several common methods for treating automotive paint exhaust gases. We commonly use activated carbon adsorption devices, where organic solvents are captured as the exhaust passes through the activated carbon, which needs regular replacement to ensure effectiveness. Catalytic combustion equipment is also widely used, heating the exhaust to around 300 degrees Celsius to decompose it into harmless substances with the help of a catalyst, offering stable performance but higher energy consumption. Photocatalytic oxidation equipment is more environmentally friendly and energy-efficient, using ultraviolet light to activate catalysts that break down the exhaust, though its effectiveness can be compromised with high-concentration exhaust. For large-scale painting workshops, RTO (Regenerative Thermal Oxidizer) systems are more efficient, completely decomposing exhaust into carbon dioxide and water. Additionally, pre-filtration steps are essential, using filter cotton to remove paint mist particles first. Regular inspection of equipment operation is crucial to avoid reduced treatment efficiency impacting the environment. The choice of method should be evaluated based on site conditions and budget constraints.
