Abstract :
A 244-reaction mechanism containing 60 species was used with the PREMIX computer program to model a stoichiometric carbon tetrachloride-methane-air flat flame with a Cl/H ratio of 0.33. The flame was found to progress in three stages, an initiation stage, a chlorine inhibited oxidation stage, and a CO burnout stage. Some important reactions occurring in each stage were identified. The simulation showed that a lack of CH3 radicals inhibited the highly exothermic oxidation reaction O + CH3 = CH2O + H. As a result, the less energetic oxidation of acetylene, O + C2H2 = CH2 + CO, became the dominant oxidation reaction. CO burnout was found to begin when hydroxyl radicals became available through the reactions O + HCl = OH + Cl and O + H2O = OH + OH.
