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1 Journal of KONES

1 2003

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Injection of lean mixtures into hot burned gas for maintaining lownox emissions over an extended range of fuel-air ratios in prevaporized combustion

Kawakami T., Aida N., Nishijima T., Yamada H., Hayashi S.

Journal of KONES

2003

Vol. 10, No. 3-4

137-148

“Flameless combustion” of lean to ultra lean mixtures, supported by hightemperature burned gas, can resolve the dilemma between complete combustion versus ultralow NOx emissions in gas turbine combustors. The characteristic of NOx emissions and combustion in “leanlean” twostage combustion was investigated for premixedprevaporized keroseneair mixtures using a coaxial flow configuration. A circular jet of secondary keroseneair mixtures of lean to ultralean compositions were injected into the primary hot burned gas prepared by combustion of lean mixtures on an annular perforated flame holder The progress of reaction and NOx formation in the combustion tube were measured for nonswirled and swirled secondary jets. The conditions required for complete combustion of the secondary mixtures were defined for various ratios of secondary to primary air flow rates.