混合气体抑制煤自燃的实验研究  

Experimental study on inhibition of spontaneous combustion of coal by gas mixture

作　　者：白刚[1,2] 王硕硕 兰天伟[1] 周西华[2] 辛天宇 BAI Gang;WANG Shuoshuo;LAN Tianwei;ZHOU Xihua;XIN Tianyu(Ordos Institute,Liaoning Technical University,Ordos 017004,China;College of Safety Science&Engineering,Liaoning Technical University,Huludao 125105,China)

机构地区：[1]辽宁工程技术大学鄂尔多斯研究院,内蒙古鄂尔多斯017004 [2]辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛125105

出　　处：《煤矿安全》2024年第9期1-11,共11页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(52274204,52104195)。

摘　　要：为了研究混合气体(O_(2)/N_(2)和O_(2)/N_(2)/CO_(2))对煤自燃特性的影响,利用同步热分析仪、程序升温-气相色谱联用仪/红外光谱仪研究煤在混合气体下的特征温度、热效应/标志气体及官能团变化。结果表明:O_(2)/N_(2)气体氛围(简称气氛)下,随着N_(2)体积分数的增加,特征温度点滞后,TG、DTG、DSC均向高温偏移,放热量减少,燃烧阶段活化能升高,煤的最终耗氧量和CO体积分数均降低,煤中羟基增加,脂肪烃、含氧官能团、芳香烃的含量呈减少趋势;O_(2)/N_(2)/CO_(2)气氛下,随着CO_(2)体积分数的增加,特征温度点后移,放热量下降,燃烧阶段活化能减小,耗氧量、CO体积分数均降低,羟基、脂肪烃增加,含氧官能团的含量减少;当O_(2)体积分数相同时,O_(2)/N_(2)/CO_(2)混合气体中的失重率峰值、耗氧量与CO体积分数均小于O_(2)/N_(2)混合气体;-OH易被氧化发生脱水反应,煤在反应初期放热量较少,后期放热量快速增加,CO主要由-C=O生成。In order to investigate the influence of gas mixture(O_(2)/N_(2) and O_(2)/N_(2)/CO_(2))on the spontaneous combustion characteristics of coal,synchronous thermal analyzers,temperature programmed gas chromatography/infrared spectrometers were used to study the characteristic temperature,thermal effect/indicator gas,and functional group changes of coal under gas mixture.The results show that under O_(2)/N_(2) atmosphere,with the increase of N_(2) volume fraction,the characteristic temperature point lags behind,TG,DTG,DSC all shift towards high temperature,heat release decreases,activation energy during combustion stage increases,final oxygen consumption and CO volume fraction of coal decrease,hydroxyl groups in coal increase,and the content of aliphatic hydrocarbons,oxygen-containing functional groups,and aromatic hydrocarbons shows a decreasing trend;under O_(2)/N_(2)/CO_(2) atmosphere,as CO_(2) increases,the characteristic temperature point shifts backward,the heat release decreases,the activation energy during the combustion stage decreases,the oxygen consumption and CO volume fraction both decrease,hydroxyl and fatty hydrocarbons increase,and the content of oxygen-containing functional groups decreases;when the volume fraction of O_(2) is the same,the peak weight loss rate,oxygen consumption,and CO volume fraction in the O_(2)/N_(2)/CO_(2) mixture are all lower than those in O_(2)/N_(2);-OH is easily oxidized and undergoes dehydration reaction.Coal releases less heat in the initial stage of the reaction,but rapidly increases in the later stage.CO is mainly generated by-C=O.

关 键 词：煤自燃 特征温度 标志气体 低温氧化 官能团 

分 类 号：TD752.2[矿业工程—矿井通风与安全]