Effect of coal type on the gasification rate.

概要

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The rate data of the coal gasification with air, CO<SUB>2</SUB> and steam in a number of literatures were summarized and reviewed to clarify the factors which control the gasification rate of coal. Based on the rate data of 68 kinds of coals whose carbon content (C [%]) range from 65.0 to 93.7%, the gasification rates of lower rank coals (C<ca. 80%) were found to be controlled mainly by the catalytic effect of coal minerals such as Ca, Na, K and so on, whereas those of higher rank coals (C>ca. 80%) were controlled by the intrinsic reactivity of coal . The intrinsic reactivity of coal was reported to decrease with the development of carbon crystallites, and was well correlated with the amount of chemically adsorbed oxygen. On the other hand, the catalytic effect was in general not so easy to represent quantitatively, but the dispersion or the crystallite size of CaO was said to control the gasification rate for a certain lignite. For the gasification catalyzed by K or Na, the amount of chemically adsorbed oxygen was again reported to be an index to represent the reactivity. The global indices such as C [%], pore surface area, reflectance etc. could be employed only for the purpose of correlation of the reactivity
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