This type of purification system is suitable for large air flows with low concentrations of solvents.
Typical range of volyme is 15 000- 250 000 m3/h and concentration range from 0 to 1 000 mg/m3.
The system consists of two units:
An adsorption unit with activated carbon filter and main fan.
A catalytic oxidation unit.
Purification takes place in two steps:
The air is purified and the solvent is concentrated in the carbon filter.
When the system is started, the speed of the main fan is automatically adjusted to draw process air from the emission points connected to the system. The main fan takes this contaminated air through the carbon filter. The solvent is adsorbed by the activated carbon and the air is purified.
Regeneration of the carbon filter and destruction of the solvent in the catalytic unit.
When the carbon filter becomes saturated with solvent, it is first shut off from the process air flow, and then regenerated using hot gas from the catalytic unit. During continuous operation, a second carbon filter takes over the adsorption process. During regeneration, the hot gas from the catalytic unit heats the carbon to release the solvent and carries the solvent to the oxidiser. Since the strip gas flow is much smaller than the process air flow, it becomes highly concentrated, allowing the solvent to be destroyed without any suplementary fuel, or energy. This is very important to achieving the low level of energy consumption.