NDLI: Large Eddy Simulations of Hydrogen Oxidation at Ultra-Wet Conditions in a Model Gas Turbine Combustor Applying Detailed Chemistry

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Krüger, Oliver Terhaar, Steffen Paschereit, Christian Oliver Duwig, Christophe
Copyright Year	2012
Abstract	Humidified Gas Turbines (HGT) offer the attractive possibility of increasing the plant efficiency without the cost of an additional steam turbine, as is the case for a combined gas-steam cycle. In addition to efficiency gains, adding steam into the combustion process reduces NOx emissions. It increases the specific heat capacity (hence, lowers possible temperature peaks) and reduces the oxygen concentration. Despite the thermo-physical effects, steam alters the kinetics, and thus, reduces NOx formation significantly. In addition, it allows operation using a variety of fuels, including hydrogen and hydrogen-rich fuels. Therefore, ultra-wet gas turbine operation is an attractive solution for industrial applications. The major modification compared to current gas turbines lies in the design of the combustion chamber, which should accommodate a large amount of steam without losing in stability. In the current study, the premixed combustion of pure hydrogen diluted with different steam levels is investigated. The effect of steam on the combustion process is addressed using detailed chemistry. In order to identify an adequate oxidation mechanism, several candidates are identified and compared. The respective performances are assessed based on laminar premixed flame calculations under dry and wet conditions, for which experimentally determined flame speeds are available. Further insight is gained by observing the effect of steam on the flame structure, in particular HO2 and OH* profiles. Moreover, the mechanism is used for the simulation of a turbulent flame in a generic swirl burner fed with hydrogen and humidified air. Large Eddy Simulations (LES) are employed. It is shown that by adding steam, the heat release peak spreads. At high steam content, the flame front is thicker and the flame extends further downstream. The dynamics of the oxidation layer under dry and wet conditions is captured, thus, an accurate prediction of the velocity field, flame shape and position is achieved. The latter is compared with experimental data (PIV and OH* chemiluminescence). The reacting simulations were conducted under atmospheric conditions. The steam-air ratio was varied from 0% to 50%.
Sponsorship	International Gas Turbine Institute
Starting Page	1081
Ending Page	1094
Page Count	14
File Format	PDF
ISBN	9780791844687
DOI	10.1115/GT2012-69446
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	Cycles Temperature Hydrogen Combustion Fuels Steam turbines Design Specific heat Flames Gas turbines Large eddy simulation Oxidation Shapes Oxygen Turbulence Stability Chemiluminescence Emissions Chemistry Heat Simulation Dynamics (mechanics) Steam Nitrogen oxides Combustion chambers
Content Type	Text
Resource Type	Article

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