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In comparison with conventional air combustion, char particle reacts with higher concentrations of O 2 and CO 2 in the oxy-fuel combustion. At higher temperatures, strong Stefan flow is formed at the char surface and the CO gas-reaction occurs in the boundary layer, which have significant effects on the char reaction and the mass transfer. But Stefan flow and CO gas-phase reaction...
Considering the effects of Stefan flow and steam in the oxy-fuel combustion of char, correction factors for the mass transfer coefficients of gas reactants, O 2 , CO 2 , and H 2 O, are derived in the present work. By comparisons with the experimental data, the rigid continuous-film model, and the uncorrected single-film model, it is concluded that the corrections greatly improve...
Stefan flow occurring at the surface of char and CO oxidation in the boundary layer are often neglected in the conventional pulverized-coal air combustion. In this work, effects of Stefan flow and CO oxidation in the oxy-fuel burning are investigated numerically and experimentally. A mathematical model is firstly developed for the combustion of a carbon particle. Comparisons with the experiment data...
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