Effect of oxidizing medium temperature on gasification process of coal char

A. G. Korotkikh^ab, K. V. Slyusarskiy<sup>b

a</sup> Tomsk State University, Research Institute of Applied Mathematics and Mechanics, Tomsk, Russia
^b National Research Tomsk Polytechnic University, Tomsk, Russia

Abstract: This work researches a coal char gasification in carbon dioxide medium at different temperatures via simultaneous thermal analysis. The coal powder samples of anthracite, bituminous coal and lignite of Kuznetsk and Kansk-Achinsk deposits with various carbon and ash content, particle structure and dispersity were investigated. The char samples for research were produced by heating coal to 1000 $^{\circ}$C in argon. The density, specific surface area, pore volume and mean particle size of the test fuel samples were determined, as well as the coal char mass loss rate over time and conversion during gasification, the activation energy of oxidation reaction and the frequency factor. A decrease in the sample gasification time and an increase in both mass loss and carbon oxidation chemical reaction rate were detected. Increasing the carbon content in the initial solid fuel caused an increase in coal char sample mass loss rate, which may be attributed to a higher porosity and specific particle reaction surface area of the solid fuel sample.

Keywords: coal char, dispersity, pore volume, gasification, thermal analysis, carbon dioxide.

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