メタノール火炎内でのNo_xの生成

概要

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The formation of NO and NO_2 in the one-dimensional laminar premixed flame of methanol-air mixtures was numerically studied by considering 39 species with 157 elementary reactions and compared with that in the methane-air premixed flame. The uncertain rate constants of consumption reactions of methanol were determined based on the reaction mechanism of methane so as to make the predicted laminar burning velocities coincide with the experimental values as well as possible. It is found that the concentration of prompt NO and Zeldovich NO in the methanol flame are lower than those in the methane flame at any equivalence ratio. The formation of prompt NO is predominantly governed by the reaction of CH+N_2=HCN+N, being accompanied with the reaction of N+O_2=NO+O. NO_2 is generated in the preheating zone by the reaction of NO with HO_2 : NO+HO_2=NO_2+OH and diminished in the downstream region by the reaction of NO_2+H=NO+OH. The NO_2 concentration in the methanol flame is also lower than that in the methane flame at any equivalence ratio. As the unburned gas temperature of methanol flame increases from 298K to 400K, the flame temperature and the NO concentration in the burned gas increase at any equivalence ratio, whereas the NO_2 concentration generated in the preheating zone decreases a little.
東海大学の論文