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- W1978511201 abstract "Twenty-five kinds of coals (carbon content on dry ash-free basis, C[%], ranges from 65.0 to 92.8%) were pyrolysed and gasified simultaneously by use of a rapid heating method (heating rate ≈ 1600 K min−1) in steam at temperatures between 750 and 850 °C to clarify the factors which control the gasification rates of various coals. The relationships were examined in detail between the reactivity of each coal, represented by the initial gasification rate − rcm0, and various properties such as pore surface area of char, ultimate and proximate analyses of coal, reflectance of coal, contents of metals in char, and the amount of oxygen trapped by char. For gasification at 800 °C, the relation between − rcm0 and the carbon content C[%] changed abruptly at C ≈ 75–80%. For higher rank coals (C > 75–80%), − rcm0 was rather small and was well correlated by C[%]. On the other hand, the plot of − rcm0versus C % scattered largely for the lower rank coals (C < 75–80%). For these coals, the rate of CO2 formation was much greater than that of CO formation, and was almost proportional to − rcm0. The CO2 formation reaction is known to be catalysed by alkali or alkaline earth metals such as Na, K and Ca. Then the reactivities of lower rank coals were supposed to be controlled mainly by the catalytic effect of the minerals in the coal." @default.
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- W1978511201 date "1986-11-01" @default.
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- W1978511201 title "Correlation of gasification rates of various coals measured by a rapid heating method in a steam atmosphere at relatively low temperatures" @default.
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- W1978511201 doi "https://doi.org/10.1016/0016-2361(86)90327-3" @default.
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