TY - JOUR
T1 - Influence of steam dilution on the ignition of hydrogen, syngas and natural gas blends at elevated pressures
AU - Donohoe, Nicola
AU - Heufer, Karl A.
AU - Aul, Christopher J.
AU - Petersen, Eric L.
AU - Bourque, Gilles
AU - Gordon, Robert
AU - Curran, Henry J.
N1 - Publisher Copyright:
© 2014 The Combustion Institute.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - This paper presents the influence of steam dilution on the autoignition behaviour of hydrogen, carbon monoxide, syngas, methane, and natural gas mixtures under gas turbine-relevant conditions. Rapid compression machine experiments were performed for fuel/air mixtures at equivalence ratios of 0.5, 1.0, and 2.0, in the temperature range 895-1140K for the H2 and CO mixtures and 730-1060K for the natural gas mixtures and at pressures of 10 and 30bar. Shock-tube experiments were performed for CH4-O2-Argon mixtures with and without H2O addition, highly diluted in argon (98% by vol.). The parameters were varied using an L9 Taguchi matrix for equivalence ratios of 0.5, 1.0, and 2.0; pressures of 1.6, 11, and 30atm; and water contents of 0%, 10%, and 30% of the fuel by volume. It was found that significant changes in the thermal properties of the mixtures affect the reactivity, whereas no chemical effect of the steam addition was observed for the majority of the mixtures investigated. Only mixtures of pure carbon monoxide were strongly influenced by water addition. In this case, the presence of water in the mixture allows the formation of relatively reactive O˙H radicals which enhances the possible oxidation chemistry of carbon monoxide leading to a greater observed reactivity of CO in the presence of water.
AB - This paper presents the influence of steam dilution on the autoignition behaviour of hydrogen, carbon monoxide, syngas, methane, and natural gas mixtures under gas turbine-relevant conditions. Rapid compression machine experiments were performed for fuel/air mixtures at equivalence ratios of 0.5, 1.0, and 2.0, in the temperature range 895-1140K for the H2 and CO mixtures and 730-1060K for the natural gas mixtures and at pressures of 10 and 30bar. Shock-tube experiments were performed for CH4-O2-Argon mixtures with and without H2O addition, highly diluted in argon (98% by vol.). The parameters were varied using an L9 Taguchi matrix for equivalence ratios of 0.5, 1.0, and 2.0; pressures of 1.6, 11, and 30atm; and water contents of 0%, 10%, and 30% of the fuel by volume. It was found that significant changes in the thermal properties of the mixtures affect the reactivity, whereas no chemical effect of the steam addition was observed for the majority of the mixtures investigated. Only mixtures of pure carbon monoxide were strongly influenced by water addition. In this case, the presence of water in the mixture allows the formation of relatively reactive O˙H radicals which enhances the possible oxidation chemistry of carbon monoxide leading to a greater observed reactivity of CO in the presence of water.
KW - Hydrogen
KW - Ignition delay times
KW - Natural gas
KW - Rapid compression machine
KW - Steam
KW - Syngas
UR - https://www.scopus.com/pages/publications/84924102357
U2 - 10.1016/j.combustflame.2014.10.005
DO - 10.1016/j.combustflame.2014.10.005
M3 - Article
SN - 0010-2180
VL - 162
SP - 1126
EP - 1135
JO - Combustion and Flame
JF - Combustion and Flame
IS - 4
ER -