Unific Estimation by Maceral on CO2 Gasification Reaction Rate of Demineralized Coal.

概要

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In the study of coal gasification, it's necessary to analyze the diffe-rent reactivity for coals. Then we estimated coal gasification reaction in point of macer-al, which was a component of coal, uniformly tried to evaluate the reactivity. We prepared four demineralized coals (Taiheiyo, Datong, Wandoan, Plateau) by the HF-HCl treatment to remove the catalytic effect of ash and carried out density separa-tion of these coals by the ZnCl2 solution (density range; 1.20-1.50) to have some sam-ples with concentrated maceral from same coal. Every fractions were gasified in a CO2 stream under 850°C, using a thermobalance and measured the reaction rate and reaction order from TG-curve. Futhermore, some fractions were characterized by ultimate and proximate analysis, CO2 surface area, chemisorbed oxygen, 13C-NMR, maceral analysis, which showed different values. Apparently, the initial reaction rate based on CO2 sur-face area was proportional to acertain maceral ratio, the rate corrected by CO2 surface area and maceral ratio had an exponential relation to H/C ratio. Also the reaction order was proportional to the vitrinite ratio in maceral groups. Consequently, it was possible that the reaction rate constant and reaction order were estimated uniformly with H/C ratio, CO2 surface area, and maceral ratio.
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