ABSTRACT

In the process of coal formation at deep coal seam, the coal quality changes by geological environment. Under the influence of high-temperature and surrounding heat storage conditions, the combined capacity of coal and oxygen is enhanced, and the risk of coal spontaneous combustion is enhanced. Based on the spontaneous combustion law of coal in deep high-temperature and thermal environment, industrial analysis and correlation analysis of coal samples with different buried depth in the same coal seam were carried out. The low-medium temperature oxidation laws of different coal samples were studied by infrared spectroscopy (IR) and thermogravimetric analysis. Industrial analysis and correlation analysis showed that the buried depth of coal samples was significantly correlated with protolith temperature and water content. The infrared spectrum analysis of coal samples showed that with the increase in buried depth, the oxygen-containing functional groups in coal structure increased so the tendency of spontaneous combustion of deep coal seam was greater. Thermogravimetric analysis showed that the low medium temperature oxidation process of coal samples could be divided into three stages. Compared with the shallow coal seam, the deep coal seam changes smoothly in the first two stages, and dramatically in the last stage.

摘要

在深部煤层成煤过程中，煤质随地质环境而变化。在高温及周围储热条件的影响下，煤与氧气的结合能力增强，煤自燃风险增加。基于煤在深层高温热环境下的自燃规律，对同一煤层中不同埋深煤样进行工业化分析和相关性分析。通过红外光谱（IR）和热重分析研究了不同煤样的中低温氧化规律。工业分析和相关性分析表明，煤样埋深与原岩温度、含水量显着相关。煤样红外光谱分析表明，随着埋藏深度的增加，煤结构中的含氧官能团增多，深部煤层自燃倾向增大。热重分析表明，煤样的中低温氧化过程可分为三个阶段。与浅层煤层相比，深部煤层在前两个阶段变化平稳，在最后阶段变化剧烈。