含瓦斯风流条件下煤自燃产物CO生成规律的实验研究

摘要

Due to the methane-contained air leakage flow existing in a high gassy goaf, an experimental system on coal sample＇ s oxidation in low temperature under the condition of methane-contained airflow was designed. Model experi- ments simulating spontaneous combustion were carried out according to the gas distributing scheme. The formation of the oxidation products CO was studied. The result shows that the temperature for initial production is suppressed and the amount of products produced decreases with the decrease of oxygen volume fraction or increase of methane volume fraction. When fresh air is used to predict the state of coal spontaneous combustion in high gassy goaf, a delayed pre- diction is caused. Finally, based on the principle of gas-solid chemical reaction kinetics, the variation of reaction rate was analyzed, and the experimental results were reasonably explained.%针对高瓦斯采空区漏风流内含有瓦斯的实际情况,自制了含瓦斯风流条件下煤的低温氧化实验系统,按拟定的配气方案开展了低温氧化实验,分析了CO的生成规律。结果表明：随氧气体积分数的降低或甲烷体积分数的升高,CO生成的初始温度滞后,相同温度时CO的生成量减小。因此,用新鲜空气来预测高瓦斯采空区的煤自燃状态,易造成错判、误判。根据气固多相反应动力学原理,分析了化学反应速率变化的原因,从而合理解释了实验结果。