遗煤二次氧化宏微观特征参数变化及动力学研究
Variation of macro and microscopic characteristic parameters and kinetics of secondary oxidation of residual coal
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摘要: 为了探究采空区遗煤二次氧化自燃特性，利用红外光谱仪和同步热分析仪等测试对比了原煤与氧化煤二次氧化过程中宏观参数与微观参数变化特性，并计算了二次氧化过程的反应动力学参数。结果表明：氧化煤中取代苯、-C=C-、-CH3、-CH2-、-CH3 /-CH2-、-C=O、-COOH等基团的含量增大，而-CH、-OH、自由基浓度、g因子、线宽则显著减小；相较于原煤，遗煤二次氧化过程中有着更小的特征温度和吸热量，有着更大的放热量、质量损失速率、综合燃烧系数；原煤和氧化煤的燃烧过程虽然均符合一级反应，但氧化煤有着更小的活化能；整体而言，氧化煤有着更强的自燃倾向性和自燃危险性。Abstract: In order to investigate the spontaneous combustion characteristics of secondary oxidation of residual coal in the mining area, the changes of microscopic and macroscopic parameters during the secondary oxidation of raw and oxidized coals were compared using tests such as infrared spectroscopy and simultaneous thermal analyzer, and the kinetic parameters of secondary oxidation were calculated. The results show that the content of substituted benzene, -C=C-, -CH3, -CH2-, -CH3/-CH2-, -C=O and -COOH groups in the oxidized coal increases, while -CH, -OH and free radical concentrations, g-factor and line width decrease significantly. Compared to raw coal, the secondary oxidation of residual coal has a smaller characteristic temperature and heat absorption and a larger heat release, mass loss rate and overall combustion coefficient. The combustion processes of both raw and oxidized coals are consistent with primary reactions, but oxidized coal has a lower activation energy. On balance, oxidized coal has a greater propensity for spontaneous combustion and a greater risk of spontaneous combustion.
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