瓦斯与煤自燃灾害共存严重威胁着矿井的安全生产。因此，通过对瓦斯与煤自燃复合灾害方面开展相关研究，揭示不同瓦斯浓度对煤自燃特征的影响规律，研究结果对煤与瓦斯复合灾害发生机理及综合治理具有重要意义。本文以长焰煤、不粘煤、瘦煤和无烟煤四种不同变质程度煤样作为研究对象，对不同瓦斯浓度下煤样的气体吸附特征、氧化放热特征、微观物理特征和煤自燃指标气体特征等进行了实验研究，旨在为含瓦斯气氛下煤自燃的防控工作提供理论依据。

       采用工业分析仪和元素分析仪测试了不同变质程度煤样的煤质组成，发现固定碳和碳元素的含量随着煤样变质程度的增加逐渐增加，挥发分和氧元素的含量则呈现出随煤样变质程度增加而逐渐减小的趋势。通过吸附常数测定实验发现在相同压力条件下，煤样对气体的吸附能力大小排序为CH₄＞N₂＞O₂。采用瓦斯吸附解吸装置对比分析了不同瓦斯浓度下煤样的瓦斯吸附特征，得出煤样的瓦斯吸附能力与煤变质程度、压力以及瓦斯浓度成正比，但与温度成反比的结论。

       通过C80微量热仪探究了瓦斯浓度对煤氧化放热的影响，对比分析了不同瓦斯浓度和变质程度煤样的热流曲线、初始放热温度以及放热量等。发现随着瓦斯浓度的升高，煤样的整个热流曲线向高温区域移动，总放热量也显著降低。瓦斯浓度升高对长焰煤、不粘煤等低变质程度煤样的低温氧化过程影响较大，瓦斯浓度的增加会使煤样优先吸附瓦斯气体，造成环境中氧气浓度的降低，进而对煤的氧化放热产生一定的抑制作用。

       基于FTIR实验得到了不同瓦斯浓度条件下煤样在低温氧化过程的活性基团变化特征，并采用Peakfit软件对煤样的活性基团进行了半定量分析。随着环境中瓦斯浓度的增加，煤样氧化过程中羟基和脂肪烃含量逐渐减少，烷基醚含量增加，而芳香烃结构变化不明显。采用程序升温实验对不同瓦斯浓度下煤样低温氧化过程中的气体产物和热动力学参数等进行了探究。结果表明，随着环境中瓦斯浓度的升高，煤自燃过程中的CO产生量和CO₂产生量、耗氧速率以及放热强度等均呈现出降低趋势，但表观活化能则相对升高。因此，环境中瓦斯浓度增加会对煤自燃过程造成一定的抑制作用。采用Pearson相关系数法探究了煤样活性基团变化量与表观活化能之间的关联程度，得出羟基和烷基醚对煤样的低温氧化过程的促进作用较大，脂肪烃则会对煤样的低温氧化过程起一定的抑制作用。

            The coexistence of gas and coal spontaneous combustion disasters seriously threatens the safety of mine production. Therefore, by carrying out relevant research on the compound disasters of gas and coal spontaneous combustion, revealing the influence of different gas concentrations on the characteristics of coal spontaneous combustion, the research results are of great significance to the mechanism and comprehensive management of coal and gas compound disasters. In this thesis, four coal samples with different levels of metamorphism, long flame coal, non-stick coal, lean coal and anthracite, are taken as the research objects. The gas adsorption characteristics, oxidation heat release characteristics, micro-physical characteristics and coal spontaneous combustion index gases of coal samples under different gas concentrations are studied. Feature and other experimental researches have been conducted to provide a theoretical basis for the prevention and control of coal spontaneous combustion in a gas atmosphere.

             Industrial analyzers and elemental analyzers were used to test the coal composition of coal samples with different degrees of metamorphism. It was found that the content of fixed carbon and carbon elements gradually increased with the degree of metamorphism of the coal samples, while the content of volatile and oxygen elements showed varying degrees. The deterioration degree of coal samples increases and gradually decreases. Through the experiments of adsorption constant determination, it is found that under the same pressure conditions, the adsorption capacity of coal samples is in the order of CH₄>N₂>O₂. The gas adsorption and desorption device is used to compare and analyze the gas adsorption characteristics of coal samples under different gas concentrations. It is concluded that the gas adsorption capacity of coal samples is directly proportional to the degree of coal deterioration, pressure and gas concentration, but inversely proportional to temperature.

            The C80 microcalorimeter was used to explore the influence of gas concentration on coal oxidation heat release, and the heat flow curve, initial heat release temperature and heat release of coal samples with different gas concentrations and metamorphic degrees were compared and analyzed. It is found that as the gas concentration increases, the entire heat flow curve of the coal sample moves to the high temperature area, and the total heat release is also significantly reduced. The increase of gas concentration has a greater impact on the low-temperature oxidation process of low-grade coal samples such as long flame coal and non-stick coal. The oxidation exotherm produced a certain inhibitory effect.

            Based on the FTIR experiment, the characteristics of the active group changes of coal samples in the low-temperature oxidation process under different gas concentration conditions were obtained, and the peakfit software was used to semi-quantitatively analyze the active groups of the coal samples. As the gas concentration in the environment increases, the content of hydroxyl and aliphatic hydrocarbons in the oxidation process of coal samples gradually decreases, and the content of alkyl ethers increases, but the structure of aromatic hydrocarbons does not change significantly. The temperature-programmed experiment was used to explore the gas products and thermodynamic parameters in the low-temperature oxidation process of coal samples under different gas concentrations. The results show that with the increase of gas concentration in the environment, the amount of CO production, CO₂ production, oxygen consumption rate and heat release intensity during the spontaneous combustion of coal all show a decreasing trend, but the apparent activation energy increases relatively. Therefore, the increase of gas concentration in the environment will have a certain inhibitory effect on the spontaneous combustion process of coal. The Pearson correlation coefficient method was used to explore the correlation between the change of active groups of coal samples and the apparent activation energy, and it was concluded that hydroxyl groups and alkyl ethers had a greater promotion effect on the low-temperature oxidation process of coal samples, while aliphatic hydrocarbons would the low-temperature oxidation process of coal samples has a certain inhibitory effect.

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