The dilution of fuel-air mixtures by exhaust gases (mainly CO 2 , H 2 O, and CO) affects the kinetics of combustion. This dilution is used in gas turbines and flameless combustor to reduce pollutant emissions, particularly nitrogen oxides (NO x ). Therefore, studying the effect of these compounds on the kinetics of oxidation of fuels such as natural gas and hydrogen is needed. The oxidation of H 2 and that of CH 4 were studied experimentally in a fused silica jet-stirred reactor (JSR) from fuel-lean to fuel-rich conditions, over the temperature range 800-1300 K. The experiments were repeated in the presence of 10% in mol of H 2 O. A detailed chemical kinetic modeling of these experiments and of literature data (ignition delays, flame speed) was performed using a detailed kinetic reaction mechanism. Good agreement between the data and this modeling was obtained. Sensitivity and reaction paths analyses were used to respectively delineate the influencing and important reactions for the kinetics of oxidation of the fuels in the presence of H 2 O. The proposed kinetic reaction mechanism helps us to understand the inhibiting effect of water vapor on the oxidation of hydrogen and methane. The effect of H 2 O on NO x formation under gas turbine conditions was also investigated numerically, showing the reduction of NO x emissions is mainly due to dilution and thermal effects.
The oxidation of methane-based fuels was studied experimentally in a fused-silica jet-stirred reactor (JSR) operating at 1–10atm, over the temperature range of 900–1450K, from fuel-lean to fuel-rich conditions. Similar experiments were performed in the presence of carbon dioxide or syngas (CO∕H2). A previously proposed kinetic reaction mechanism updated for modeling the oxidation of hydrogen, CO, methane, methanol, formaldehyde, and natural gas over a wide range of conditions including JSR, flame, shock tube, and plug flow reactor was used. A detailed chemical kinetic modeling of the present experiments was performed yielding a good agreement between the modeling, the present data and literature burning velocities, and ignition data. Reaction path analyses were used to delineate the important reactions influencing the kinetic of oxidation of the fuels in the presence of variable amounts of CO2. The kinetic reaction scheme proposed helps understand the effect of the additives on the oxidation of methane.
The dilution of fuels by exhausts gases (mainly CO, CO2 and H2O) affects the kinetics of combustion. This dilution is used in gas turbines and flameless combustor. It helps reducing pollutant emissions, particularly NOx. Therefore, it is useful to study the effect of such compounds on the kinetics of oxidation of fuels such as natural gas and hydrogen. The oxidation of hydrogen and that of methane were studied experimentally in a fused silica jet-stirred reactor (JSR) over the temperature range 800–1500 K, from fuel-lean to fuel-rich conditions. The experiments were repeated in presence of 10% in mole of water vapor. A detailed chemical kinetic modeling of the present experiments and of literature data (flame speed, ignition delays) was performed using a previously proposed kinetic reaction mechanism, showing good agreement between the data and this modeling. Sensitivity and reaction paths analyses were used to delineate the important reactions influencing the kinetic of oxidation of the fuels in presence of water vapor. The kinetic reaction scheme proposed helps understanding the inhibiting effect of water vapor on the oxidation of hydrogen and methane. The effect of water vapor on NOx formation under gas turbine conditions was also investigated numerically using the proposed kinetic scheme.
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