39.詳細な化学を考慮した石炭揮発成分燃焼の数値シミュレーション

概要

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Homogeneous combustion of volatiles from seventeen coals were numerically simulated with detailed chemical kinetics. The composition of coal volatile was estimated based on the experimental results reported by Xu and Tomital who pyrolyzed seventeen coals in a Curie point pyrolyzer and quantitatively analyzed fifteen pyrolysates by a gas chromatography. A reaction mechanism including 257 chemical species and 2216 reactions developed by Richter et al. and a software package computing time dependent homogeneous reaction system were employed for the numerical simulations. When mixed coal and air at a stoichiometric ratio and assumed the molecular mass of tar produced in the coal pyrolysis to be 350, the coal volatiles account for only a few percent of gas phase in volume at 1037K. The simulation was performed at an initial temperature of 1037K under isobaric (1bar) and adiabatic conditions. Chemical compositions of coal volatiles influence the ignition delay time and adiabatic temperature, varying 1〜25 ms and 1130 to 1400K, respectively. Mixing ratio of coal and air is also an important factor for the combustion characteristics. Sensitivity analysis provided insight into the crucial reaction steps in the coal combustion which are radical producing reactions such as H+O_2→OH+H enhancing combustion and radical quenching reactions such as H+O_2→HO_2 hindering combustion.
一般社団法人日本エネルギー学会の論文
2006-10-12