To research the impact of oxygen consistency on the thermal dynamic characteristics and the change of gas products of weakly caking coal oxidation, differential scanning calorimetry and temperature programmed experiments were used to study, and the correlation between the intensity of heat release at distinct consistencies of oxygen and concentration of gas products was computed applying grey correlation method. The outcomes indicated that the coal low-temperature oxidation process can be categorized into three phases: speedy endothermic, slow endothermic, and exothermic. The apparent activation energy in the slow heat absorption phase exceeded the speedy endothermic stage, and the apparent activation energy in the heat release phase increased by 20.83 kJ/mol. The concentration of gas products generated at the spontaneous combustion process of coal growth when temperature went up. However, CH4 concentration increased with the temperature rising after 120 °C. C2H6 gas does not appear until 100 °C. C2H4 gas appeared after 90 °C. At various O2 consistencies, the correlation between exothermic intensity and CO2 remained the largest, the correlation between exothermic intensity and CO and CH4 was larger at lower oxygen consistencies. As concentration of oxygen increased, the correlation between exothermic intensity and C2H4 and C2H6 increased first and then decreased.

中文翻译：

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低氧浓度环境下弱结块煤氧化的热力学特性及气态产品的变化规律


为研究氧浓度对弱结块煤氧化热动力学特性和瓦斯产物变化的影响，采用差示扫描量热法和程序升温实验进行研究，采用灰色相关法计算了不同浓度氧下放热强度与瓦斯产物浓度的相关性。结果表明，煤低温氧化过程可分为三个阶段：快速吸热、慢吸热和放热。慢热吸收期的表观活化能超过快速吸热期，放热期的表观活化能增加了 20.83 kJ/mol。温度升高时，煤生长自燃过程中产生的气体产物浓度。然而，CH4 浓度在 120 °C 后随着温度的升高而增加。 C2H6 气体直到 100 °C 才会出现。 90 °C 后出现 C2H4 气体。 在各种 O 2 浓度下，放热强度与 CO2 之间的相关性保持最大，放热强度与 CO 和 CH4 之间的相关性在较低氧浓度下更大。随着氧浓度的增加，放热强度与 C2H4 和 C2H6 的相关性先增加后降低。