A preliminary kinetic model of chromium in a hydrogen/air flame

Chromium has been identified as a carcinogenic metal. Incineration is the u seful method for disposal of toxic chromium hazard waste and a chromium kin etic model in a flame is very important to study chromium oxidation. Chromi um chemical kinetics over a range of temperatures of a hydrogen/air flame i s proposed. Nine chromium compounds and fifty-eight reversible chemical rea ctions were considered. The forward reaction rates are calculated based on the molecular collision approach and Arrhenius's Law. The backward reaction rates were calculated according to forward reaction rates, the equilibrium constants and chemical thermodynamics. The kinetic model is verified for t wo premixed equilibrium cases and is tested for a hydrogen/air diffusion fl ame. A chemical flux analysis is employed to reveal the significant chemica l reactions. The results show that the kinetic model is precise enough and the chromium kinetics play an important role in the Hydrogen/Air diffusion flame.