The spray coating industry is a major emitter of VOCs, and the effectiveness of its treatment directly impacts the survival and development of enterprises. Our company’s Spray Coating Waste Gas Catalytic Combustion Project, launched for this sector, has been successfully applied in several large-scale projects, with a treatment capacity of up to 40,000 to 60,000 m³/h. It has become a demonstration project widely studied by the industry, thanks to its high purification efficiency and significant economic benefits.

Spray coating waste gas has a complex composition, often containing toxic and harmful substances such as benzene, toluene, and xylene, and the gas concentration fluctuates greatly with production rhythms, making treatment highly challenging. Our company’s catalytic combustion system first uses high-efficiency composite fiber + mesh filters to pre-treat over 98% of the paint mist particles in the waste gas, preventing subsequent equipment clogging and catalyst poisoning.

The pre-treated clean gas then enters the core catalytic combustion unit. This system uses a new honeycomb precious metal catalyst, which features low ignition temperature (as low as 200-250°C), high catalytic activity, and a long service life (typically 3-5 years). Under the action of the catalyst, organic waste gas undergoes complete oxidation at relatively low temperatures, converting into non-toxic CO₂ and H₂O, with a stable purification efficiency of over 99%, effectively preventing secondary pollution.

Particularly noteworthy is the system’s regenerative heat recovery design. The heat released during the oxidation and decomposition of organic waste gas is efficiently recovered by the regenerator and used to preheat the incoming waste gas. When the waste gas concentration reaches a certain value (e.g., 450 ppm), the system can achieve “self-sustaining” operation, requiring little or no auxiliary fuel and reducing operating costs by over 70% compared to traditional direct-fired equipment. This truly achieves “turning waste into treasure,” creating direct energy-saving benefits for customers.

The successful application of this project not only helps enterprises achieve stable compliance with emissions standards but also brings economic benefits through energy recovery, embodying the perfect unity of environmental and economic benefits and outlining a clear blueprint for the green future of the spray coating industry.