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

In general, it is difficult for the low NOx 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 NOx reduction in non-premixed flames. In the present study, experiments on non-premixed, lift-off jet flam...

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Bibliographic Details
Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 71; no. 701; pp. 310 - 315
Main Authors UEJIMA, Mitsuhiro, IWAKI, Ryo, WAKIMURA, Makoto, NODA, Susumu, ONUMA, Yoshiaki
Format Journal Article
LanguageJapanese
English
Published The Japan Society of Mechanical Engineers 2005
Subjects
Diffusion Combustion
Gaseous Fuel
Lifted Flame
Nitrogen Oxides
Partial Premixed Combustion
Pollutant
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Summary:In general, it is difficult for the low NOx 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 NOx 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 NOx formation was examined. It was shown that the increase of the lift-off height reduces NOx emission. The results suggest that the premixing after the process of the injection of fuel becomes a very effective method for NOx reduction in non-premixed combustion.
ISSN:0387-5016
1884-8346
DOI:10.1299/kikaib.71.310