MATEC Web Conf.
Volume 92, 2017Thermophysical Basis of Energy Technologies (TBET-2016)
|Number of page(s)||5|
|Published online||21 December 2016|
Coal char oxidation kinetics in air medium
National ResearchTomsk polytechnic university, 634050 Tomsk, Russia
* Corresponding author: email@example.com
Study of oxidation kinetics for three types of coal char with different carbon content in air is presented. The coal char powders of anthracite, bituminous T-grade coal and 2B-grade lignite with particle size less than 80 μm were tested. The coal char oxidation was researched by isothermal method via simultaneous TG-DSC analyzer Netzsch STA 449 Jupiter F3 in the temperature range of 1000–1200 °C. Measurements were carried out at ambient pressure. Volumetric flow rate of oxidizing medium into analyser chamber was 250 ml/min. Flow consisted of air and argon with volumetric ratio 24/1. Carbon average rate of oxidation reaction at each temperature were defined based on experimental results. Kinetic constants (the frequency factor and activation energy) were defined for Arrhenius equation modified with three submodels: volumetric model, shrinking core model and random pore model. The activation energy values for anthracite are 1,6-1,7 times higher than for chars of bituminous coal and lignite.
© The Authors, published by EDP Sciences, 2017
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