Pyrolysis of Bituminous Coal and Reactivity between Bituminous Coal Chars and Various Reactive Gases

概要

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The gasification rates and methane formation for raw bituminous coal, demineralized bituminous coal and the coal chars, high in pyrite and sulfur, were investigated in various gases at 700°C and 850°C. Weight loss or methane production during coal pyrolysis up to 1, 000°C in N2 was essentially the same over the raw and demineralized bituminous coal and reached a maximum rate in the temperature range of 480∼520°C. Gasification of the char in steam was inhibited by the presence of H2 and CO. Carbon deposition from CO disproportionation was clearly seen the dry in H2/CO mixture at both 850 and 700°C. The deposited carbon was seen to be particularly reactive to steam at 850°C and at 700°C. Inorganic constituents present in the raw coal char exhibited negligible catalyst activity for the methanation reaction in the presence of H2/CO at 850 and 700°C.
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