This process consists of increasing the temperature in order to obtain the VOC destruction. The use of catalysts decreases considerably the activation energy for this kind of reactions.
The catalyst is chosen according to the organic compounds which have to be treated and also taking into account that there can be pollutants in the gas. They can be metalic oxides or a precious metal on an inert support, such as ceramics or alumina.
In order to reduce the energy consumption the gases are preheated in a gas/gas heat exchanger prior to their way through the catalytic reactor. This way a recuperative energy efficiency of 70% is achieved.
There is also another possibility: regenerative recuperation, working with ceramic beds on which the catalyst lays, achieving an energy efficiency of 95%.
Catalytic oxidation characteristics:
Wide flow range
Reaction temperature: 200 – 450 ºC
Recuperative catalytic oxidation works without fuel from 3,5 – 4 g/Nm3 depending on the organic compounds’ LHV
Regenerative catalytic oxidation works without fuel from 0,8 – 1 g/Nm3 depending on the organic compounds’ LHV
It enables working with concentration ranges up to 25 % LEL
High VOC destruction ranges > 99%
It is necessary to ensure poison absence in the waste gas
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