二次氧化煤自燃热特性与活性基团迁变规律研究  

Study on spontaneous combustion thermal characteristic and change of active functional group of secondary oxidized coal

作　　者：张岩峰 李璕 Zhang Yanfeng;Li Xun(Zhongtian Hechuang Energy Co.,Ltd.,Wushen Banner Inner Mongolia 017320,China;CCRI Tongan(Beijing)Intelligent Control Technology Co.,Ltd.,Beijing 100013,China;Mine Intelligent Ventilation Division,CCTEG China Coal Research Institute Co.,Ltd.,Beijing 100013,China)

机构地区：[1]中天合创能源有限责任公司,内蒙古乌审旗017320 [2]煤科通安(北京)智控科技有限公司,北京100013 [3]煤炭科学技术研究院有限公司矿山智能通风事业部,北京100013

出　　处：《煤化工》2024年第4期104-108,共5页Coal Chemical Industry

基　　金：国家自然科学基金面上项目(52074156)。

摘　　要：以葫芦素煤矿(Hls)长焰煤为研究对象,采用TG和FTIR测试了煤二次氧化过程中热特性参数变化,根据特征温度点T0~T5描述二次氧化煤样自燃过程,计算得到煤样放热量与综合燃烧系数S,分析了不同温度预氧化煤样表面活性基团的变化。研究表明:随着预氧化温度的升高,煤样的T1呈降低趋势,T2呈增加趋势,T3呈降低趋势,而T4、T5变化趋势不明显。经过预氧化的煤样,在脱水吸附阶段温度范围缩小,但吸氧增重能力提高,率先达到燃烧温度。随着预氧化温度的升高,煤样放热量与综合燃烧系数S呈缓增后降趋势。预氧化对煤样氢键含量、芳香族CH与脂肪族CH含量起到积极影响,煤体表面产生大量活性羟基、甲基、亚甲基,含氧官能团含量随着温度的增大呈现先增后减再增趋势。Taking Hls long-flame coal as the research object,TG and FTIR were used to test the change of thermal characteristic parameters during the secondary oxidation of coal.Characteristic temperature points T0-T5 were used to describe the spontaneous combustion process of the secondary oxidation coal samples.The heat release and comprehensive combustion coefficient S of the coal were calculated,and the changes of surface active functional groups of the pre-oxidized coal under different temperature conditions were analyzed.The research showed that with the increase of pre-oxidation temperature,T1 of the coal sample showed a decreasing trend,T2 showed an increasing trend,and T3 showed a decreasing trend,while T4 and T5 showed no obvious change trend.The temperature range of the pre-oxidized coal was reduced in the stage of dehydration and adsorption,but the ability of oxygen absorption and weight gain was improved,and the combustion temperature was reached first.With the increase of pre-oxidation temperature,the heat release and the S of coal showed the trend of slow increase before decrease.The pre-oxidized coal had a positive effect on hydrogen bond content,aromatic CH and aliphatic CH content,and a large amount of active-OH,methyl and methylene were produced on the coal surface.The content of oxygen-containing functional groups increased first,then decreased and increased again with the increase of pre-oxidation temperature.

关 键 词：煤自燃 热特性 活性官能团 热重法(TG) FTIR 

分 类 号：TD752[矿业工程—矿井通风与安全]