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.
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机译：提出了三种空气中碳含量不同的煤焦的氧化动力学研究。测试了无烟煤，烟煤T级煤和2B级褐煤的煤焦粉，其粒径小于80μm。煤焦氧化是通过等温方法，同时通过TG-DSC分析仪Netzsch STA 449 Jupiter F3在1000–1200°C的温度范围内进行的。在环境压力下进行测量。进入分析仪室的氧化介质的体积流量为250 ml / min。流量由体积比为24/1的空气和氩气组成。根据实验结果确定各温度下的碳平均氧化反应速率。为Arrhenius方程定义了动力学常数（频率因子和活化能），该方程用以下三个子模型修改：体积模型，收缩核模型和随机孔模型。无烟煤的活化能值比烟煤和褐煤的焦炭高1,6-1,7倍。
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