The gas-phase partial oxidation (POx) of nascent volatiles (NV) derived from the fast pyrolysis of cedar sawdust at 700 and 800 o C was studied both numerically and experimentally. A detailed chemical kinetic model (DCKM) was applied to simulate the POx in a two-stage reactor: the first stage was designed for fast biomass pyrolysis and the second effected the POx of the NV. Analytical pyrolysis experiments were also conducted to approximate the molecular composition of the NV, which is required input for computations using DCKM. The DCKM was modified by an empirical kinetic model for the decomposition of an ill-defined portion of the NV. The kinetic model coupled with a plug-flow reactor model reproduced the observed trends in the product yields with respect

Steam reforming (SR) and partial oxidation (POx) of nascent volatiles (NV) generated from fast pyrolysis of cedar wood chips in a two-stage reactor were studied numerically. A detailed chemical kinetic model (DCKM) consisting of more than 8000 elementary step-like reactions and more than 500 chemical species was used to simulate pyrolysis at 750 °C and reforming of the NV at 900 °C in the first and second stages, respectively.The molecular composition of the NV, which is one of the required boundary conditions for computations using the DCKM, was approximated based on analytical pyrolysis experiments. Global reactions accounting for the decomposition of the ill-defined portion of the NV and soot reforming were also tested to improve the model capabilities. The DCKM with the global reaction coupled with a plug-flow reactor model could fairly reproduce the experimentally observed trends for the effects of oxygen and steam partial pressures on the yields of major products such as hydrogen, carbon monoxide, and tar residual rate. 熱分解部と改質部で構成される二段反応器における，スギチップ熱分解で生成した揮発成分の無触媒水蒸気改質および部分 酸化特性に関する数値解析的研究を実施した。揮発成分に含まれる化学種の反応を網羅する 8000 以上の素反応および 500 以 上の化学種からなる詳細化学反応速度モデルをバイオマス急速熱分解生成物の水蒸気改質反応系に初めて適用し，反応特性の 予測を試みた。本速度モデルを用いたシミュレーションの場合，熱分解生成物の分子組成を定義する必要がある。そこで，別途， 熱分解-ガスクロマ トグラフィー実験を実施し，熱分解初期生成物中の 52 種類の化合物を同定，定量した。初期熱分解生成物に 含まれる未定義成分 (ガスクロマトグラフィーで分離不可能な重質成分)の分解やススのガス化反応を表現する総括反応モデルを 経験的に構築し， これらを詳細化学反応速度モデルに加えてシミュレーショ ンを実施した。得られた反応速度モデルは，水蒸気およ び酸素の分圧が，水素，一酸化酸素などの主要生成物の収率に及ぼす影響ばかりでなく，微量副生成物であるタールの転換特性 に及ぼす影響も良好に再現した。