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矿井自燃火区注氮气灭火时发现,煤体的温度仍会在高温中维持一段时间,高温下煤样对氮气的吸附影响着煤氧化自燃特性。以锡盟褐煤为研究对象,将煤样分别在200℃下吸附氮气6、12、18 h,通过分析实验煤样的气相产物及氧气消耗,煤氧化表观活化能以及煤孔隙结构参数的变化,研究吸附氮气后煤样的氧化特性。实验表明,煤样经过高温吸附氮气的处理后,气相产物的释放量均高于原煤;高温吸附氮气降低了煤氧化活化能,吸附氮气时间越长,活化能值越低;处理后煤的孔平均直径、孔隙率与渗透率均高于原煤,增加了煤氧反应速率,加快煤氧反应进程。
Spontaneous combustion zone of mine injection of nitrogen gas fire extinguishing found that the temperature of coal will remain at high temperatures for some time, high temperature coal sample adsorption of nitrogen affects the spontaneous combustion of coal oxidation characteristics. Taking Ximeng lignite as the research object, the coal samples were respectively adsorbed nitrogen at 200 ℃ for 6, 12 and 18 h. By analyzing the gas phase products and oxygen consumption, the apparent activation energy of coal oxidation and the change of pore structure parameters , To study the oxidation characteristics of coal samples adsorbed nitrogen. The experimental results show that after the high temperature nitrogen adsorption, the release amount of gas phase products are higher than that of the raw coal. High temperature nitrogen adsorption reduces the coal oxidation activation energy. The longer the nitrogen adsorption time, the lower the activation energy value. Average diameter, porosity and permeability are higher than the original coal, increasing the reaction rate of coal oxygen to speed up the process of coal-oxygen reaction.