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Lean Low NOx Primary Zones Using Radial Swirlers FREE

[+] Author Affiliations
H. S. Alkabie, G. E. Andrews, N. T. Ahmad

The University of Leeds, Leeds, UK

Paper No. 88-GT-245, pp. V003T06A027; 10 pages
doi:10.1115/88-GT-245
From:
  • ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Amsterdam, The Netherlands, June 6–9, 1988
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7920-7
  • Copyright © 1988 by ASME

abstract

Swirling flow primary zones with between 30% and 60% simulated primary zone air flow were investigated using curved blade radial swirlers. Two radial swirlers were compared with the same open area but different outlet diameters, d, giving different expansion ratios, D/d, from the swirler to the combustor diameter, D. Two combustors were used, 76 mm and 140 mm diameter, the larger one corresponding to the size of several gas turbine can combustors. There was no influence of D/d on the weak extinction. It was demonstrated that an adequate efficiency was not achieved in the weak region until there was a significant outer expansion and associated recirculation zone. It was shown that these systems with central gaseous fuel injection had good flame stability with very low NOx emissions. Propane and natural gas were compared and the NOx emissions were 50% lower with natural gas. The optimum NOx emissions, compatible with a high combustion efficiency, were close to 10 ppm NOx emissions corrected to 15% oxygen.

Copyright © 1988 by ASME
Topics: Nitrogen oxides
This article is only available in the PDF format.

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