高温下煤吸附氮气后氧化特性变化的实验研究
发布时间：2018-08-16 17:12
【摘要】：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。
[Abstract]:It is found that the temperature of coal body will remain in high temperature for a period of time when injecting nitrogen gas to extinguish fire in mine spontaneous combustion area. The adsorption of nitrogen gas to coal sample under high temperature affects the characteristics of coal oxidation spontaneous combustion. Taking Ximeng lignite as the research object, the coal sample was adsorbed nitrogen at 200 鈩，
本文编号：2186644
[Abstract]:It is found that the temperature of coal body will remain in high temperature for a period of time when injecting nitrogen gas to extinguish fire in mine spontaneous combustion area. The adsorption of nitrogen gas to coal sample under high temperature affects the characteristics of coal oxidation spontaneous combustion. Taking Ximeng lignite as the research object, the coal sample was adsorbed nitrogen at 200 鈩，
本文编号：2186644
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