本论文以铜川陈家山矿的新鲜原煤、水浸煤、氧化煤、水浸氧化风干煤作为研究对象，对四个煤样的微观物理、化学结构以及在低温氧化阶段的热分解特征参数进行研究。分析四个煤样的自燃倾向性，为煤炭安全开采提供更多的理论依据。

通过工业、元素实验与扫描电镜实验，分析了各煤样的挥发分、灰分、水分、元素成分含量以及表面结构变化，得出：工业、元素分析中，各煤样的参数均发生了不同程度的变化。水浸煤表面则出现了微小级孔、裂隙结构；氧化煤与水浸氧化风干煤孔裂隙结构明显增多，结构宽度程度增大。

通过XRD实验对各煤样的矿物质成分、微晶结构进行了分析，得出：实验煤样中主要含有的矿物质为石英。且与原煤相比，其他三个煤样的衍射峰均发生了偏移。水浸氧化风干煤体较其他煤样中，d_m、L_c、M_c、P出现不同程度的减小趋势。但与原煤相比水浸煤与水浸氧化风干煤的L_a出现增大。

通过红外光谱实验对各煤样中的主要官能团进行了分析，可知：原煤中羟基多以分子内氢键的形式存在，而氧化煤、水浸煤与水浸氧化风干煤中，羟基多以游离的羟基存在。煤分子中脂肪烃主要在2975-2915cm^-1间存在。原煤、水浸煤、氧化煤、水浸氧化风干煤的主要官能团吸收峰面积依次增大。

通过热物性与C80实验，分别研究了在不同氧浓度条件下，各煤样的热物性参数、热流曲线与活化能等参数。得到：热扩散系数随着温度的升高而降低。而比热容与导热系数均随着温度的增大而增大。但四个实验煤样的热物性参数均没有随着氧浓度的增加或减小呈现出较明显的变化规律。实验煤样热流值与温度、氧浓度均呈现正相关关系。其中，水浸氧化风干煤活化能随着氧浓度的增加而减小。

In this thesis, fresh raw coal, water-soaked coal, oxidized coal and water-soaked oxidized air-dried coal from Chenjiashan mine in Tongchuan.They were used as the research objects to investigate the micro-physical and chemical structures of the four coal samples as well as the characteristic parameters of thermal decomposition in the low temperature oxidation stage. The spontaneous combustion propensity of the four coal samples was analyzed to provide a more theoretical basis for safe coal mining.

The volatile matter, ash, moisture, elemental composition content, and surface structure changes of each coal sample were analyzed by industrial and elemental experiments and scanning electron microscopy experiments, and it was concluded that: the parameters of each coal sample changed to different degrees in industrial and elemental analysis. The surface of water-soaked coal, on the other hand, showed tiny grade pore and fissure structures; the pore and fissure structures of oxidized coal and water-soaked oxidized air-dried coal increased significantly and the degree of structure width increased.

The mineral composition and the microcrystalline structure of each coal sample were analyzed by XRD experiments, and it was concluded that: the main mineral contained in the experimental coal samples was quartz. And opposed to the original coal, the diffraction peaks of the other three coal samples were shifted. The d_m, L_c, M_c, and P showed different decreasing trends in the water-leached oxidized air-dried coal body compared with the other coal samples. However, L_a appeared to increase in the water-soaked coal compared with the water-soaked oxidized air-dried coal compared with the raw coal.

The main functional groups in each coal sample were analyzed by infrared spectroscopy experiments, and it was found that the hydroxyl groups in raw coal mostly existed as intramolecular hydrogen bonds, while in oxidized coal, water-leached coal and water-leached oxidized air-dried coal, the hydroxyl groups mostly existed as free hydroxyl groups. Aliphatic hydrocarbons in coal molecules are mainly present between 2975-2915 cm^-1. The absorption peak areas of the principal functional groups of raw coal, water-leached coal, oxidized coal and water-leached oxidized air-dried coal increased in order.

The parameters of thermal properties, heat flow curves and activation energy of each coal sample were investigated by thermal properties and C80 experiments under different oxygen concentration conditions, respectively. It was obtained that the thermal diffusion coefficient decreased with the increase of temperature. The specific heat capacity and thermal conductivity both increase with the increase of temperature. However, the thermal properties of the four experimental coal samples did not show any obvious change with the increase or decrease in oxygen concentration. The heat flow value of each coal sample showed positive correlation with temperature and oxygen concentration. Among them, the activation energy of water-oxidized air-dried coal reduced with the increase of oxygen concentration

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