Premixing Combustion of a Lifted Non-Premixed Flame in Hot Airstreams and NOx Reduction

In general, it is difficult for the low NO.z combustion to occur in non-premixed flames. It was assumed that the premixing combustion by the spouting of fuel and air brought about the remarkable NO. reduction in non-premixed flames. In the present study, experiments on non-premixed, lift-off jet fla...

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Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 17; no. 1; pp. 310 - 315
Main Authors Uejima, Mitsuhiro, Iwaki, Ryo, Wakimura, Makoto, Noda, Susumu, Onuma, Yoshiaki
Format Journal Article
LanguageJapanese
Published 01.01.2005
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Summary:In general, it is difficult for the low NO.z combustion to occur in non-premixed flames. It was assumed that the premixing combustion by the spouting of fuel and air brought about the remarkable NO. reduction in non-premixed flames. In the present study, experiments on non-premixed, lift-off jet flames in a high-temperature air stream were carried out. The premixing occurs in the lift-off region. The air temperature was 1073 K, and the mixture of ethylene and nitrogen were used for fuels. With the lift-off height changed, the effect of the premixing on NO. formation was examined. It was shown that the increase of the lift-off height reduces NO. emission. The results suggest that the premixing after the process of the injection of fuel becomes a very effective method for NO.r reduction in non-premixed combustion.
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ISSN:0387-5016