Study of oscillations during methane oxidation with species probing


Biogas has been considered as a renewable energy source with respect to fossil fuels due to its sustainability, security supply, and environmental friendly potential [1-4]. Methane occupies a large part in biogas. It is of great value to review the methane oxidation for a primary understanding of the features associated with biogas combustion. It was found that dynamic behavior in terms of methane oxidation occurred under specific conditions. The first methane oxidation oscillation experiments were conducted by [5] in a jet-stirred reactor (JSR) and were extended to a higher inlet temperature [6]. The map of dynamic behavior was drawn in terms of various C/O ratios and temperatures ranging from 1025-1275 K at a fixed 90% nitrogen bath gas. Recently, Lubrano Lavadera et al. [7] investigated the main parameters, such as, equivalence ratios (0.5-1.5), residence time (1.5-2 s), various bath gases (N2, CO2, He, H2O), on the oscillatory behavior of methane oxidation. However, to our best knowledge, studies of dynamic phenomenology with species probing have never been reported. Because of the heat release in terms of the exothermic or endothermic reactions, the temperature and species oscillations are strongly coupled during fuel oxidation. In order to put emphasis on species dynamic behavior, very diluted conditions are needed to decouple as much as possible temperature and species oscillations. The purpose of this work is to investigate the effects of various parameters: inlet mole fraction of methane (0.1-0.5%), stoichiometric condition (=1) and reactor temperatures (950-1200 K), on the species oscillations during methane oxidation. A detailed kinetic mechanism (POLIMI) [8] is selected to interpret the experimental data

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