It is clear that each type of pollutant requires different design considerations because, to achieve optimal effectiveness and efficiency of abatement, it may be necessary to modify turbulence, temperature and residence time.
However, to these three parameters, we need to add a fourth: the concentration of oxygen in the effluent.
In heat recovery systems, generally, oxygen is an integral part of the effluent and it is hardly necessary to add more to ensure that the minimum excess of air is achieved. Typically, in oxidative systems, this value is adopted as at least 3% in excess respect the stoichiometric quantity. Typical values of oxygen concentration at the stack, for oxidizers, are about 15% or more, depending on application, input data and input conditions.
From the above, it is easy to understand how all these factors must be balanced to find the right mix able to break down VOCs. For this reason, the design of the thermal oxidizers must be carried out by people specialized in the sector and with the right knowledge in this field.
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