Flame stability is a crucial issue in low 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 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 emissions are presented for pressures up to , bulk velocities in the range of 32–, two different preheating temperatures (, ), and a range of fuel mixtures from pure methane to 20% by volume. The influence of turbulence on LBO limits is also discussed. In addition to the investigation of perfectly premixed -enriched flames, LBO and 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 compared to pure methane. The flame temperature at LBO is lower resulting in the reduction of concentration by ).
Lean Blowout Limits and Emissions of Turbulent, Lean Premixed, Hydrogen-Enriched Methane/Air Flames at High Pressure
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Griebel, P., Boschek, E., and Jansohn, P. (August 15, 2006). "Lean Blowout Limits and Emissions of Turbulent, Lean Premixed, Hydrogen-Enriched Methane/Air Flames at High Pressure." ASME. J. Eng. Gas Turbines Power. April 2007; 129(2): 404–410. https://doi.org/10.1115/1.2436568
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