Inside the thermal oxidizer, each regenerative chamber contains a ceramic bed that has the function of storing heat, which is heated or cooled depending on the direction of the flow of the emission to be treated.
The pollutant-laden emission to be purified reaches the first chamber (i.e., after the expansion, the first two) and, passing through the ceramic bed heated during the previous phase, is brought to a temperature as close as possible to the reaction temperature (which is approximately 850 °C).
The reaction temperature is maintained by auto-combustion of the contaminants in the emission, which, being VOCs, have a good calorific value, but can also be controlled by the introduction of auxiliary fuel in the heating transients.
The emission to be treated remains at combustion temperature for a residence time sufficient to completely oxidize the pollutants it contains.
After leaving the combustion chamber, the purified emission flows vertically from top to bottom through the second chamber (i.e. the third and fourth, after expansion). The average duration of these process intervals is variable and automatically regulated by a logic specially developed by Brofind according to its own industry-specific know-how.
The third (fifth, after expansion) chamber, on the other hand, allows for further treatment of the incompletely treated emission, which could be conveyed directly to the stack during flow reversal.