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Lean Blowout Limits and NOx Emissions of Turbulent, Lean Premixed, Hydrogen-Enriched Methane/Air Flames at High Pressure
Journal article

Lean Blowout Limits and NOx Emissions of Turbulent, Lean Premixed, Hydrogen-Enriched Methane/Air Flames at High Pressure

  • Griebel, P. Combustion Research, Paul Scherrer Institut (PSI), 5232 Villigen PSI, Switzerland
  • Boschek, E. Combustion Research, Paul Scherrer Institut (PSI), 5232 Villigen PSI, Switzerland
  • Jansohn, P. Combustion Research, Paul Scherrer Institut (PSI), 5232 Villigen PSI, Switzerland
  • 2006-8-15
Published in:
  • Journal of Engineering for Gas Turbines and Power. - ASME International. - 2006, vol. 129, no. 2, p. 404-410
English Flame stability is a crucial issue in low NOx combustion systems operating at extremely lean conditions. Hydrogen enrichment seems to be a promising option to extend lean blowout limits (LBO) of natural gas combustion. This experimental study addresses flame stability enhancement and NOx reduction in turbulent, high-pressure, lean premixed methane/air flames in a generic combustor capable of a wide range of operating conditions. Lean blowout limits and NOx emissions are presented for pressures up to 14bar, bulk velocities in the range of 32–80m∕s, two different preheating temperatures (673K, 773K), and a range of fuel mixtures from pure methane to 20% H2∕80%CH4 by volume. The influence of turbulence on LBO limits is also discussed. In addition to the investigation of perfectly premixed H2-enriched flames, LBO and NOx are also discussed for hydrogen piloting. Experiments have revealed that a mixture of 20% hydrogen and 80% methane, by volume, can typically extend the lean blowout limit by ∼10% compared to pure methane. The flame temperature at LBO is ∼60K lower resulting in the reduction of NOx concentration by ≈35%(0.5→0.3ppm∕15%O2).
Language
  • English
Open access status
closed
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Persistent URL
https://sonar.ch/global/documents/92930
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