O-201 木質バイオマス粒子の熱分解中における熱・化学反応シミュレーション(セッション2:熱分解・ガス化)

概要

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Heat transfer and heterogeneous chemical reactions in a biomass particle during pyrolysis were investigated numerically. When the lignin decomposition would occur mainly, the temperature in the particle increased with the effect of the radiation heat transfer through the pores. If the tar decomposed to char and gas, the temperature in the particle increased slightly due to the exothermic reaction of char formation and the yield of gas was more than those of tar and solid. Time course of the temperature at the center didn't depend on the lignin content of the biomass. However, the higher the lignin content of biomass made the more the yields of the tar and solid and the less the yield of gas at steady state for 673K < T_S (setting temperature) < 1073K. There were two regimes for the relationship between the setting temperature (T_S) and the maximum gas flow rate didn't depend on the lignin content. The gas could be formed by the decomposition of cellulose and hemicellulose for T_S < 573 K while it would be formed by the decomposition of lignin for TS > 573 K. The maximum gas generation rate depended on the volume of the particle until a certain particle size, Dp*(a few mm). On the other hand, it depended on the surface area of the particle for Dp > Dp*.
2012-12-25