Regenerative thermal oxidizers consist of several vertical prism towers, partially filled with ceramic material, and an oxidation chamber which joins the towers.
The gas flow goes through one tower and absorbs energy from the filling (heated in prior cycles). These gases reach the oxidation chamber where the reaction takes place. Afterwards they go through another tower giving off heat to the filling.
Several watertight valves switch cyclically in a way that allows the gas to enter always through a warm bed.
The inversion of the flux direction would cause a little waste gas emission through the stack. In order to avoid this, a third tower takes part in the purge process by re-circulating a bit of flow to the fan.
Regenerative thermal oxidation characteristics:
Gas flows from 1.000 Nm3/h
Reaction temperature: 750 – 1100 ºC
It allows an energy efficiency up to 95%
If the inlet concentration of the waste gas is lower than 2,5 g/Nm3, it is designed a system with 2 towers. For higher concentrations, it is designed a system with 3 towers.
It works without fuel from 1,5 – 2 g/Nm3 depending on the organic compounds LHV
Suitable for large gas flows with low VOC concentration
It enables working with concentrations up to 25 % LEL
High VOC destruction ranges> 99%
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