In this work, thermal behaviors of ten coal samples (across different thermal maturity levels) collected from five different open cast mines in the Jharia and Raniganj basins, India, were examined using differential scanning calorimeter (DSC), thermogravimetry (TG–DTG), Rock–Eval, and organo-petrographic techniques. Rank played a critical factor in controlling their thermal behavior, and with increasing coal rank the combustion parameters shifted towards higher temperatures. The oil-window mature non-coking coals were marked by least ignition and burnout temperatures, least DSC T_peak, DTG T_peak, and maximum reactivity. In contrast, the coking-coal samples of peak-oil window and condensate wet–gas window stages of maturity, because of their higher thermal maturity level and lower reactivity, required higher temperatures for combustion. Among the peak-oil window mature coking coals, one sample (C4) showed distinct lower combustion parameters relative to others, although vitrinite reflectance (Ro; %) and Rock–Eval pyrolysis T_max showed similar results as the other coals. This sample was marked by higher reactive maceral content. Highest combustion parameters and least reactivity were shown by the Jhama sample (baked coal), followed by the condensate wet–gas window mature coking coals. The Rock–Eval S4 T_peak clearly resolved the coal samples with distinct maturities and complemented the results from TG–DTG–DSC thermograms. Our results indicate that Rock–Eval S4T_peak can be used to decipher convincingly the thermal maturity level of coals.

在这项工作中，使用差示扫描量热仪（DSC），热重分析（TG-DTG）对从印度Jharia和Raniganj盆地的五个不同的露天煤矿采集的十个煤样品（在不同的热成熟度水平下）的热行为进行了研究，岩石评估和有机岩相学技术。等级是控制其热行为的关键因素，并且随着煤等级的提高，燃烧参数向更高的温度转移。油窗成熟的非焦煤的特征是最低着火温度和燃尽温度，最低DSC T_峰，DTG T_峰和最大的反应性。相比之下，成熟的峰值油窗和冷凝水湿气窗阶段的焦煤样品，由于其较高的热成熟度和较低的反应性，因此需要较高的燃烧温度。在峰值油窗成熟的炼焦煤中，一个样品（C4）相对于其他样品显示出明显更低的燃烧参数，尽管镜质体反射率（Ro ;％）和Rock-Eval热解T _max显示出与其他煤相似的结果。该样品的特征在于较高的反应性黄酮含量。Jhama样品（烤煤）显示出最高的燃烧参数和最低的反应性，其次是凝结水湿气窗口成熟的炼焦煤。岩石评估S4 T_峰清楚地分辨出具有不同成熟度的煤样品，并补充了TG–DTG–DSC热谱图的结果。我们的结果表明，Rock–Eval S4T_峰可用于令人信服地解释煤的热成熟度水平。