Abstract
Evolution of the internal pore structure during the combustion of two different types of coal chars is compared. In this study brown coal char prepared from brown coal (coal-mine Novaky) by drying and devolatilization, and commercial black coal char (provided by U.S. Steel Kosice) were used. Particles were combusted to different degrees of burnout at an initial temperature of 800°C in a low oxygen containing atmosphere (5 vol%). It was shown that the combustion of both types of coal chars proceeds via the same shell progressive mechanism, despite differences in their original internal pore structure. The internal surface area of the brown coal char particles mainly belongs to the region of micropores, while for the black coal char is typical its macropore structure. Inside the brown coal particle cores pore structure evolution was observed. This change of the structure was caused by the reaction between solid carbon and carbon dioxide, due to which the specific surface area in the region of micropores significantly increased.
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