They are employed for the oxidation of volatile organic compound (VOC) conveyed by air flow produced in production departments and conveyed outside of the working area.
The thermal oxidation of the VOC take place in the combustion chamber, thermally insulated, at a temperature of 750 -850 ° C; it is possible to reduce the output concentration of VOC at 5 -20 mg / Nm3.
The heat required to increasing temperature of combustion chamber (in the starting phase) and to maintain the combustion temperature is supplied from an intake fuel, usually natural gas or LPG.
The combustors are defined by the term “regenerative” since the heat of exhaust smoke from the combustion chamber is used for preheating the ceramic material contained in a first heat exchange tower; incoming fumes, passing over a second exchange tower already in temperature, exchange heat accumulated and provided by the already purified hot fumes. The third room in stand-by ensures that there are no peaks of concentration of VOC in the atmosphere during inversion phase of exchanging rooms.
The dimensional criteria are given in Table 1 “Minimum requirements for thermal and catalytic combustion systems” UNI 11304-2: 2008, incorporated into PC.T board: 02 BAT Lombardia (DGR May 30, 2012 – n. 3552), in particular:
The number of exchanging rooms depend on the type of pollutant and the flow of the fumes. The most common configurations are:
COIND may assist the customer in all phases, from design to turn-key RTo; in particular: