The method of dividing the “three zones” of spontaneous combustion in goaf by oxygen volume fraction is the most widely used and effective method at present. However, the oxygen volume fraction method does not consider the influence of methane concentration in goaf, which is only applicable to low-gas goaf, not high-gassy goaf. In this work, the oxidation behavior and kinetics parameters of a lean coal at low temperatures under five different oxygen concentrations, including methane and its kinetics during low-temperature oxidation, were studied using temperature programming tests and thermogravimetric tests. The results showed that the decrease of oxygen content improves the adsorption capacity of coal to absorb different atmospheres at the initial stage. In the whole reaction process, there is a negative correlation between the strong-to-weak order of exothermicity and adsorption capacity, with a significant increase in apparent activation energy E. A marked hysteresis of the precipitation time of CO and CO₂ and a decrease in their precipitation amount and a rise in the initial temperature for the generation of CO and CO₂ were found.

中文翻译：

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不同氧浓度下贫煤的低温氧化行为和动力学参数

将采空区自燃“三个区域”除以氧气体积分数的方法是目前使用最广泛，最有效的方法。但是，氧气体积分数法没有考虑采空区甲烷浓度的影响，该方法仅适用于低瓦斯采空区，不适用于高瓦斯采空区。在这项工作中，使用温度编程测试和热重测试研究了贫煤在五种不同氧浓度下的低温下的氧化行为和动力学参数，包括甲烷及其在低温氧化过程中的动力学。结果表明，氧含量的降低提高了煤在初始阶段吸收不同大气的吸附能力。在整个反应过程中_由图2可知，由于生成CO和CO ₂，其析出量减少，初始温度上升。