Abstract
This article summarizes the results of a series of combustion kinetic investigations on chars from a suite of ten US coals of various rank. An optical technique was used to measure in situ single-particle sizes, temperatures, and velocities, from which combustion rates were computed using a model of gas-particle transport processes. Combustion rates were also determined independently by an inorganic tracer technique based on chemical analysis of extracted samples. The data set was acquired in a single experimental facility, using a standardized experimental procedure, and was analyzed in a uniform way to allow direct comparisons between coals. A pronounced trend is evident in the data set; char reactivity decreases with increasing carbon content of the parent coal. A unified treatment of this data set is presented, culminating in a rank-dependent reactivity correlation, allowing the prediction of char combustion rates for a range of coals under conditions relevant to pulverized coal fired combustors.
Published Version
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