复采煤层氧化煤的自燃特性研究  

Study on spontaneous combustion characteristics of oxidized coal in re-mining coal seam

作　　者：张艳芳 王福生 王建涛[1] ZHANG Yanfang;WANG Fusheng;WANG Jiantao(College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China;Mining Development and Safety Technology Key Laboratory of Hebei Province,Tcmgshan 063210,China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]河北省矿业开发与安全技术重点实验室,河北唐山063210

出　　处：《煤矿安全》2021年第5期31-35,共5页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51474086);河北省自然科学基金资助项目(E2014209138);华北理工大学培育基金资助项目(GP201511)。

摘　　要：针对复采煤层的煤的自然发火现状,分析荆各庄矿的4种不同复采时间的氧化煤自燃特性的差异。采用程序升温-气相色谱联用实验,对比不同复采时间煤样的自燃氧化过程中的特征气体含量变化和自燃倾向性变化。结果表明:4种煤样产生的CO体积分数在170℃前后呈现不同的变化规律;复采时间越长的氧化煤,煤样产生CH_(4)、C_(2)H_(4)、C_(2)H_(6)气体的时间越晚;通过对不同煤样交叉点温度和FCC复合指标的综合分析,得出短时间复采的煤样其自燃氧化能力强于长时间复采的煤;在同一种煤的低温段和高温段,自燃倾向性也随着表观活化能在不断变化。According to the current situation of spontaneous combustion of coal in the re-mining coal seam,the differences of spontaneous combustion characteristics of oxidized coal in Jinggezhuang Mine with four different re-mining times are analyzed.The characteristic of gas content changes and spontaneous combustion tendency changes of coal samples during spontaneous oxidation process with different re-mining times were compared by using temperature-programmed gas chromatography.The results indicate that the CO concentration produced by the four kinds of coal samples changed differently before and after 170℃;the longer the re-mining time is,the later the coal sample produces CH_(4),C_(2)H_(4) and C_(2)H_(6) gases;through the comprehensive analysis of temperature and FCC composite index of different coal samples,it is concluded that the spontaneous combustion oxidation capacity of coal samples with short time re-mining is stronger than that with long time re-mining;in the low temperature and high temperature section of the same kind of coal,the tendency of spontaneous combustion is changing with the apparent activation energy.

关 键 词：复采煤 程序升温 FCC 表观活化能 自燃倾向性 

分 类 号：TD752.2[矿业工程—矿井通风与安全]