Formation and Control of Nitric Oxide from Fuel Nitrogen : 1st Report, Experimental and Modeling Studies of Fuel NO in Premixed Flat Flames

Abstract

The formation of nitric oxide from small additions of ammonia in premixed methane/air and hydrogen/air flat burner flames was studied and the conversion ratio of ammonia to nitric oxide was compared with the ;model calculation proposed. Experimental results show that fuel-NO is formed promptly above the equilibrium concentration in and near the flame zone and that the conversion ratio becomes larger (i) at higher air ratio, (ii) for less fuel-N, and (iii) at higher flame temperature. These characteristics can be explained by the kinetic scheme based primarily on extended Zeldovich mechanism if an assumption is made that fuel-N decays finally into N atom.