Research on the spontaneous combustion of coal caused by sulfur has always been focused on pyrite in coal but has rarely considered the influence of organic sulfur. In this paper, coal samples, rather than model compounds, were used to study the influence of organic sulfur content in coal on its spontaneous combustion process. The results of X-ray photoelectron spectroscopy and thermogravimetry, differential scanning calorimetry, and mass spectrometry indicate that organic sulfur in Shuiyu clean coal exists in forms of mercaptan, thioether, sulfone (sulfoxide), and thiophene. With the decrease of organic sulfur content, the characteristic temperature points and the peak values of the exothermic curves in the process of coal oxidation spontaneous combustion all shifted toward higher temperatures. The ignition activation energy of coal also increased, and the initial and peak gas evolution temperatures of the oxidation products shifted toward higher temperatures. These findings suggest that the reduction of organic sulfur content can inhibit the oxidation process and spontaneous combustion tendency of coal. This effectively reveals the mechanism of the spontaneous combustion of coal and is of great significance to future studies in this field.

硫引起煤自燃的研究一直集中在煤中的黄铁矿上，而很少考虑有机硫的影响。在本文中，煤样品，而不是模型化合物，被用来研究煤中有机硫含量对其自燃过程的影响。X 射线光电子能谱和热重分析、差示扫描量热分析和质谱分析结果表明，水玉精煤中的有机硫以硫醇、硫醚、砜（亚砜）和噻吩的形式存在。随着有机硫含量的降低，煤氧化自燃过程中的特征温度点和放热曲线峰值均向较高温度移动。煤的点火活化能也增加，氧化产物的初始和峰值析气温度向更高的温度移动。这些发现表明有机硫含量的降低可以抑制煤的氧化过程和自燃倾向。这有效地揭示了煤自燃的机理，对该领域的未来研究具有重要意义。