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The combined process consisting of a water curtain cabinet, spray tower, dry filter and two-stage activated carbon adsorption is a common industrial waste gas treatment technology. It is mainly applied to the waste gas generated in industries such as painting and chemical engineering. The introduction of each equipment in this process is described as follows:
Water Curtain Cabinet
It is mainly used for waste gas treatment in painting workshops. The self-priming water pump circulates water to the water curtain plate to form a uniform flowing water film. The paint mist generated by the spray gun is washed down into the water tank by the water curtain. A small amount of uncaptured paint mist is discharged through the exhaust duct by the fan.
Spray Tower
The spray tower is generally arranged as the subsequent treatment equipment of the water curtain cabinet. The waste gas fully contacts with sprayed liquid (usually water) inside the tower. Liquid droplets wash and absorb particulate matter, paint mist and partial water-soluble organic pollutants to further remove impurities from the waste gas.
Dry Filter
Medium-efficiency or high-efficiency filter cotton is adopted as the core filter material. It intercepts fine residual particles and paint mist in waste gas through physical filtration. Solid particulate matter is trapped on the surface of the filter material to prevent the blockage of micropores in the subsequent activated carbon device and avoid the reduction of adsorption performance.
Two-stage Activated Carbon Adsorption
The system is composed of two sets of activated carbon adsorption devices. The first stage adopts coal-based granular carbon to treat high-concentration VOCs waste gas with an adsorption efficiency of 60% - 80%. Coconut shell-based activated carbon or chemically impregnated carbon is used in the second stage for deep adsorption of residual small-molecule pollutants, ensuring that the tail gas meets emission standards.
