不同气体环境长焰煤氧化进程基团演化特性  

Groups evolution of long-flame coal oxidation process under various air ambience

作　　者：吕志广 徐永亮[1,2,3] 刘泽健 吴晋东 李敏杰 Lü Zhiguang;XU Yongliang;LIU Zejian;WU Jindong;LI Minjie(College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic Universityy Jiaozuo 454003,China;Collaborative Innovation Center for Coal Safety Production&High-efficient-clean Utilization,Jiaozuo 454003,China)

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454003 [2]河南省瓦斯地质与瓦斯治理重点实验室一省部共建国家重点实验室培育基地,河南焦作454003 [3]煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454003

出　　处：《煤矿安全》2022年第2期46-52,共7页Safety in Coal Mines

基　　金：国家自然科学基金面上资助项目(52074108,51874124)。

摘　　要：漏风强度不仅加大煤自燃的危险性,而且是采空区遗煤自燃引发煤火灾害的致因。为探究火区启封时漏风强度对遗煤自燃特性的影响,利用煤自燃特性测定装置对煤样进行程序升温实验,然后运用傅里叶变换红外光谱法(FTIR)进行分析,得到不同气体环境下各特征温度点官能团相对含量变化。结果表明:含氧基团中,伴随温度阶段的提升,-COOH含量整体上升,-C-O-含量波动虽不明显,但整体含量较高;-OH官能团中,在各温度阶段都有存在且谱峰强度明显;脂肪烃中,-CH_(3)和-CH_(2)的谱峰面积均较大,无论干空气或氮气氛围各温度点都有参与反应,且活性较高;通过结构参数值分析,T_(120)是关键的活性点温度;干空气或氮气氛围下自然降温处理的煤样,在T_(120)相比原煤各官能团反应更加剧烈,官能团变化更大;整体上氮气氛围官能团变化增长和下降的趋势相比干空气氛围变化较小,煤复燃的危险性也降低。The intensity of air leakage not only increases the risk of spontaneous combustion of coal,but also is the cause of coal fire disasters caused by spontaneous combustion of coal left in the goaf.Aim to find the influence of the air leakage intensity on the spontaneous combustion characteristics of the remaining coal when the fire zone is opened,the coal spontaneous combustion characteristics measuring device is used to conduct a temperature-programming experiment on the coal samples,and then Fourier transform infrared spectroscopy (FTIR) is used for analysis to obtain different gas environments.The relative content of functional groups changes at each characteristic temperature point.The results show that in the oxygen-containing groups,the content ofCOOH increases as the temperature rises.Although the change range of-C-O-is not obvious with the rise of the temperature point,its content is relatively high;in the functional groups of-OH,it is present at all temperature stages.It exists and the peak intensity is obvious;among the aliphatic hydrocarbons,the peak areas of-CH_(3)and-CH_(2)are both large,and both dry air and nitrogen atmosphere participate in the reaction at various temperature points,and the activity is high.Through structural parameter value analysis,T_(120)is the key active point temperature.In the coal sample that is naturally cooled under dry air or nitrogen atmosphere,the functional groups of the raw coal react more violently in T_(120),and the functional groups change more.As a whole,the increasing and decreasing trend of functional group changes in nitrogen atmosphere is smaller than that in dry air atmosphere,and the risk of coal re-ignition is also reduced.

关 键 词：煤自燃 傅里叶变换红外光谱法 分峰拟合 官能团 结构特性 氧化进程 

分 类 号：TD752.2[矿业工程—矿井通风与安全]