NDLI: Ignition Delay Time and Laminar Flame Speed Calculations for Natural Gas/Hydrogen Blends at Elevated Pressures

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Brower, Marissa Petersen, Eric Metcalfe, Wayne Henry, J. Curran Füri, Marc Bourque, Gilles Aluri, Naresh Güthe, Felix
Copyright Year	2012
Abstract	Applications of natural gas and hydrogen co-firing have received increased attention in the gas turbine market, which aims at higher flexibility due to concerns over the availability of fuels. While much work has been done in the development of a fuels database and corresponding chemical kinetics mechanism for natural gas mixtures, there are nonetheless few if any data for mixtures with high levels of hydrogen at conditions of interest to gas turbines. The focus of the present paper is on gas turbine engines with primary and secondary reaction zones as represented in the Alstom and Rolls Royce product portfolio. The present effort includes a parametric study, a gas turbine model study, and turbulent flame speed predictions. Using a highly optimized chemical kinetics mechanism, ignition delay times and laminar burning velocities were calculated for fuels from pure methane to pure hydrogen and with natural gas/hydrogen mixtures. A wide range of engine-relevant conditions were studied: pressures from 1 to 30 atm, flame temperatures from 1600 to 2200 K, primary combustor inlet temperature from 300 to 900 K, and secondary combustor inlet temperatures from 900 to 1400 K. Hydrogen addition was found to increase the reactivity of hydrocarbon fuels at all conditions by increasing the laminar flame speed and decreasing the ignition delay time. Predictions of turbulent flame speeds from the laminar flame speeds show that hydrogen addition affects the reactivity more when turbulence is considered. This combined effort of industrial and university partners brings together the know-how of applied, as well as experimental and theoretical disciplines.
Sponsorship	International Gas Turbine Institute
Starting Page	1005
Ending Page	1016
Page Count	12
File Format	PDF
ISBN	9780791844687
DOI	10.1115/GT2012-69310
Volume Number	Volume 2: Combustion, Fuels and Emissions, Parts A and B
Conference Proceedings	ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2012-06-11
Publisher Place	Copenhagen, Denmark
Access Restriction	Subscribed
Subject Keyword	Methane Temperature Turbulence Hydrogen Combustion Fuels Engines Flames Gas turbines Databases Chemical kinetics Co-firing Engineering disciplines Ignition delay Combustion chambers Natural gas
Content Type	Text
Resource Type	Article

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