Chemical Kinetics of the NH sub 3 /NO Reaction System under Combustion Exhaust-Flow Conditions

摘要

Quantitative understanding of the NH/sub i/NO/sub x/ reaction system is necessary to optimize the homogeneous removal of exhaust flow nitric oxide by ammonia addition and to minimize the formation of NO/sub x/ from fuel nitrogen. Attempts to model this chemistry have been hampered by a lack of high temperature rate constant and product branching ratio data for key reactions. Utilizing a unique high temperature flow facility, the rate constants for important initiation and propagation steps for the NH/sub i/NO/sub x/ reaction system have been measured over the temperature range 294 to 1200 exp 0 K. Product branching results have been incorporated into a chemical model which describes the salient features of the NO/sub i/NO/sub x/ reaction system. The application of the model in predicting the behavior of NO in combustor exhaust flows upon addition of ammonia is presented.