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This study takes place in an engineering global study of incineration process (rotary kiln, post-combustion room, smoke treatment), which has as objective the identification of the aero-thermal and chemical behaviour of the reactive flow in the post combustion room. The work developed here, in an engineering approach, focuses in particular on the verification of the three T rule (Temperature, Turbulence and Time stay of gases) in the first treatment smoke unity. The study is done through numerical simulation in reactive flow of a post-combustion room. The incineration unity works with a rotary kiln of 1.5 MW and consuming gas fuel. Phoenics is used to achieve simulation, taking into account turbulence and combustion interaction through the Eddy Break Up model coupled with the turbulence model K-ε. [ABSTRACT FROM AUTHOR]