IGTC-41 Numerical Analysis of Nitrogen Dioxide Formation in Combustors(Session B-5 NUMERICAL ANALYSIS OF COMBUSTION)

概要

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The formation of NO_2 in the mixing region of the combustion gases of methane and hydrogen with the diluent air in combustors was numerically studied by considering 40 species with 158 reactions for methane and 14 species with 36 reactions for hydrogen. As the combustion gas, the hot burnt gas of atmospheric and laminar premixed flat flames of methane-air and hydrogen-air was used. NO_2 is generated in the mixing region of hot burnt gas with the surrounding air having a peak of concentration at a temperature between 700K and 800K. The generated NO_2 is converted to NO at higher temperatures than 1000K. The formation of NO_2 is mainly attributed to the reaction of NO with HO_2 produced via the reaction of O_2 with H. H species exists in the burnt gas or is produced by oxidation reactions of unburnt fuels such as HCHO, CHO, etc. in the burnt gas. With increase in concentrations of H and unburnt fuels in the burnt gas, the NO_2 formation in the mixing region is enhanced and the NO_2/NO_x ratio is also increased. The NO_2 concentration and the NO_2/NO_x are higher for the burnt gas of methane than those of hydrogen.
公益社団法人日本ガスタービン学会の論文
1995-10-00