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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低氧环境下弱粘结煤氧化热力学特性及气态产物变化规律


为研究氧浓度对弱粘结煤氧化热动力特性及气体产物变化的影响，采用差示扫描量热法和程序升温实验，研究不同氧浓度下放热强度之间的相关性。采用灰色关联法计算气体产物浓度。结果表明，煤的低温氧化过程可分为快速吸热、慢速吸热和放热三个阶段。慢吸热阶段的表观活化能超过了快速吸热阶段，放热阶段的表观活化能增加了20.83 kJ/mol。当温度升高时煤生长自燃过程中产生的气体产物的浓度。然而，120℃以后，CH4浓度随着温度升高而增加。 C2H6气体直到100℃才出现。 90℃后出现C2H4气体。在不同的氧气浓度下，放热强度与CO2之间的相关性仍然最大，在氧气浓度较低时，放热强度与CO和CH4之间的相关性更大。随着氧浓度的增加，放热强度与C2H4和C2H6之间的相关性先增加后减少。