The Regenerative Thermal Oxidizers or Combustors are aspiration and filtration systems which eliminate organic substances present in the airflow through combustion or thermal oxidation. Their main distinguishing advantage is the heat and energy recovery system.
High purification efficiency: the high temperatures of the combustion chamber ensure the complete oxidation and elimination of polluting substances.
High efficiency energy recovery system: the exchange and thermal recovery process reaches 90-97% of efficiency through ceramic beds.
Consumption optimization and costs reduction: the energy recovery system reduces the needed quantity of combustible and related costs.
Energetic advantages of thermal oxidation
The combustor is efficiently used when the carbon filter is not advantageous or efficient anymore. In particular, CTR can be used when the emitted organic substances have such concentrations to cause a short durability of the absorbent bed, even with low airflow rates (high mass flow). Thermal oxidation is also used in the event of particularly odorous emissions, especially in sensitive anthropic contexts (industries in tourist places, city centers, areas of high environmental interest, etc.). The combustion of the polluted air is performed in a thermally insulated chamber at minimum temperature of 750°C. The necessary heat is supplied by a fuel, usually natural gas or LPG. What allows industries using these systems to reduce energy consumptions and costs for their functioning is the energy recovery system, called “regenerative”. Indeed, Regenerative Thermal Combustors use ceramic beds as heat exchangers.
The heat of the fumes exiting from the combustion chamber is used to preheat the ceramic masses contained in a first thermal exchange tower. Incoming fumes pass through a second exchange tower in temperature and exchange in turn the heat which has been accumulated and supplied by the already purified warm fumes. The third chamber in stand-by ensures that there are no concentration peaks of organic compounds in the atmosphere during the inversion phase of chambers. In this regard, compared to bicameral combustors, three-compartments ones have a third chamber in stand-by which has exactly the function of ensuring that there aren’t high concentrations of exiting contaminant during this inversion phase of chambers. The efficiency of thermal recovery reaches 90-97%.