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Medientyp:
E-Artikel
Titel:
Laminar Burning Velocities and Emissions of Hydrogen–Methane–Air–Steam Mixtures
Beteiligte:
Göckeler, Katharina;
Krüger, Oliver;
Paschereit, Christian Oliver
Erschienen:
ASME International, 2015
Erschienen in:
Journal of Engineering for Gas Turbines and Power, 137 (2015) 3
Sprache:
Englisch
DOI:
10.1115/1.4028460
ISSN:
0742-4795;
1528-8919
Entstehung:
Anmerkungen:
Beschreibung:
Humidified gas turbines using steam generated from excess heat feature increased cycle efficiencies. Injecting the steam into the combustor reduces NOx emissions, flame temperatures, and burning velocities, promising a clean and stable combustion of highly reactive fuels such as hydrogen or hydrogen–methane blends. This study presents laminar burning velocities for methane and hydrogen-enriched methane (10 mol. % and 50 mol. %) at steam contents up to 30% of the air mass flow. Experiments were conducted on prismatic Bunsen flames stabilized on a slot-burner, employing OH planar laser-induced fluorescence (OH-PLIF) as an indicator for flame front areas. The experimental burning velocities agree well with results from one-dimensional simulations using the GRI 3.0 mechanism. Burning velocities reduce nonlinearly with ascending steam mole fractions and more rapid compared to simulations using “virtual H2O” stemming from a chemical influence on reactions. Hydrogen enrichment increases burning velocities, extending the flammability range toward leaner and more humid mixtures. Additionally, measured NOx and CO emissions reveal a strong reduction in NOx emissions for increasing steam dilution rates, whereas CO curves are shifted toward higher equivalence ratios.