The spontaneous combustion of coals is a natural phenomenon that causes serious losses in the mining sector as well as environmental problems as a result of greenhouse gases released during spontaneous combustion of coal. In this study, for the first time, the effect of coal reactor size on the spontaneous combustion tendency parameters (crossing point temperature (CPT), average heating rate (AHR), and liability index (I_FCC)) of the coal samples having two different ranks (bituminous coal and lignite) have been searched by the use of crossing point method. According to the results obtained from the reactors manufactured in three different sizes (R-1, R-2, and R-3), ignition temperatures of coal samples were 161–172 °C for bituminous coal and 143–175 °C for lignite; average temperature rise was 0.92–1.45 °C min⁻¹ for bituminous coal and 1.47–2.98 °C min⁻¹ for lignite; spontaneous combustion risk index was determined in the range of 5.61–8.88 min⁻¹ for bituminous coal and 8.39–20.79 min⁻¹ for lignite. As the reactor size decreased, spontaneous combustion tendencies of lignite samples increased, and no significant change was observed in bituminous coal samples. It has been found that the effect of reactor size on the spontaneous combustion of coal gives significant results in low-rank coals but has no effect on high-rank coals.

中文翻译：

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反应器大小对不同煤化度煤自燃特性影响的研究

煤的自然燃烧是自然现象，由于在煤的自然燃烧过程中释放出的温室气体，导致采矿行业的严重损失以及环境问题。在这项研究中，在第一次，煤反应器大小对自燃倾向参数（交叉点温度（CPT），平均升温速度（AHR），和责任指数（I效果_FCC具有两个煤样的））使用交叉点法搜索了不同等级（烟煤和褐煤）。根据从三种不同尺寸（R-1，R-2和R-3）制造的反应堆获得的结果，烟煤的点燃温度为烟煤为161-172°C，褐煤为143-175°C ; 平均温度升高0.92–1.45°C分钟^-1用于烟煤和1.47-2.98℃每分钟^-1褐煤; 烟煤的自燃风险指数范围为5.61–8.88 min ^-1，褐煤的范围为8.39–20.79 min ^-1。随着反应器尺寸的减小，褐煤样品的自燃趋势增加，并且在烟煤样品中未观察到显着变化。已经发现，反应器尺寸对煤自燃的影响在低等级煤中给出了显着的结果，但是对高档煤没有​​影响。