【摘要】：礦井自燃火區(qū)注氮氣滅火時發(fā)現(xiàn),煤體的溫度仍會在高溫中維持一段時間,高溫下煤樣對氮氣的吸附影響著煤氧化自燃特性。以錫盟褐煤為研究對象,將煤樣分別在200℃下吸附氮氣6、12、18 h,通過分析實驗煤樣的氣相產(chǎn)物及氧氣消耗,煤氧化表觀活化能以及煤孔隙結(jié)構(gòu)參數(shù)的變化,研究吸附氮氣后煤樣的氧化特性。實驗表明,煤樣經(jīng)過高溫吸附氮氣的處理后,氣相產(chǎn)物的釋放量均高于原煤;高溫吸附氮氣降低了煤氧化活化能,吸附氮氣時間越長,活化能值越低;處理后煤的孔平均直徑、孔隙率與滲透率均高于原煤,增加了煤氧反應(yīng)速率,加快煤氧反應(yīng)進程。
[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，

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