Noncircular jet shear layer turbulent diffusion flames for ultra-low NO{sub x} gas turbine primary zones
- Univ. of Leeds (United Kingdom). Dept. of Fuel and Energy
Direct fueling of each shear layer generated by an array of holes in a grid plate, with the fuel injected radially inward from the jet wall, was shown to have ultra-low NOx emissions combined with a good flame stability, compared with a premixed system. Four shear layers in a 76 mm combustor were used at gas turbine primary zone operating conditions with 60% simulated primary zone air at one bar pressure. The fuel used was natural gas. Non-circular s layers have additional mixing forces due to additional small scale turbulence generated at jet sharp edges and these enhance the fuel and air mixing rates in the shear layer. This resulted in reduced NOx emissions for the non-circular shear layers for the same equivalence ratio. Four different jet hole shapes were compared with circular holes at 740 and 600K inlet temperatures. NOx emissions were reduced by up to a factor of three by changing from circular to noncircular shear layers and each jet hole shape had different NOx emissions. NOx emissions as low as 1ppm corrected to 15% oxygen were demonstrated with 1ppm CO at 740K and 0.4 equivalence ratio. These designs have the potential for a dry NOx solution to any current or proposed gas turbine NOx regulation for natural gas.
- OSTI ID:
- 86041
- Report Number(s):
- CONF-941024-; ISBN 0-7918-1213-8; TRN: IM9534%%112
- Resource Relation:
- Conference: 8. COGEN-TURBO power congress and exposition: gas turbines in cogeneration and utility, industrial and independent power generation, Portland, OR (United States), 25-27 Oct 1994; Other Information: PBD: 1994; Related Information: Is Part Of ASME cogen turbo power `94. IGTI-Volume 9; Kidd, H.A.; Cooke, D.H.; Fransson, T.H.; Greitzer, E.M. [eds.]; PB: 759 p.
- Country of Publication:
- United States
- Language:
- English
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