With the expansion of the scale of coal mining, the safety problems caused by the reburning of coal are becoming more and more serious. In this paper, the pyrolysis characteristics of gas coal and the exothermic characteristics of reoxidation of residues were studied by using a synchronous thermal analyzer. The functional groups of pyrolysis residues were tested, and the group content and characteristic structural parameters were calculated based on quantum chemistry method. The results show that with the increase of pyrolysis temperature, Volatile maximum separation rate (Vmax) and the change in the residual weight of the coal sample (ΔW_vp) increase. The increase of temperature will lead to the decrease of hydroxyl and aliphatic hydrocarbon content in coal, and the increase of aromatic hydrocarbon. With the deepening of pyrolysis, the ignition point temperature of coal samples decreases first and then rises, the combustion intensity and combustion concentration are strengthened. The pyrolysis results show that 462.8°C is the critical temperature for the transition during pyrolysis. The ignition point of the residue is less affected by the pyrolysis conditions, and the ignition temperature of the raw coal and the pyrolysis residue varies within 330.57°C–334.98°C.

随着煤炭开采规模的扩大，煤炭再燃带来的安全问题日益严重。本文利用同步热分析仪研究了气煤的热解特性和残渣再氧化的放热特性。对热解残渣的官能团进行了测试，并基于量子化学方法计算了基团含量和特征结构参数。结果表明，随着热解温度的升高，挥发分最大分离率（Vmax）和煤样残余重量（ΔW _vp） 增加。温度升高会导致煤中羟基和脂肪烃含量降低，芳香烃增加。随着热解的加深，煤样的燃点温度先降低后升高，燃烧强度和燃烧浓度增强。热解结果表明，462.8℃是热解过程中转变的临界温度。残渣的着火点受热解条件的影响较小，原煤和热解残渣的着火温度在330.57℃～334.98℃之间变化。