ZEROclean Concentration System with Thermal Post Treatment

Using a combination of concentration and thermal post treatment is a particularly cost effective way of cleaning large-volume exhaust air flows with low hydrocarbon concentrations. With a combination of these systems, the total investment and, operating costs can be significantly reduced in comparison with using a thermal process alone.

Typical applications are exhaust air volumes from approx. 30,000 Nm³/h with solvent concentrations < 1 g/Nm³. For this process combination to work successfully, the temperature of process exhaust air must be < 40°C, the relative humidity < 80% and the exhaust air must be largely free of dust.

Exhaust air flows with low organic solvent concentrations, are cleaned to the required limits by using a continuously operating rotor made of hydrophobic zeolite which absorbs the solvents. The adsorbed solvents are continuously de-absorbed by a much smaller hot air stream which is finally treated by a compact installation (thermal, catalytic or thermal-regenerative) downstream.

This reduces the size of the exhaust air purification system needed downstream by 90-95% – and, of course, the corresponding investment costs.

The de-sorption air is preheated via the hot clean gas from the thermal post treatment either directly or indirectly (depending upon the level of available energy and local conditions) or by using a separate burner system.

• Painting and spray booths
• Semiconductor industry
• GPR industry