不同变质程度煤自燃产物特性与官能团变化  

Product characteristics and functional group changes of spontaneous combustion during different stages of metamorphic coal

作　　者：李璕 李伟 姚海飞 彭然 贾廷贵 LI Xun;LI Wei;YAO Haifei;PENG Ran;JIA Tinggui(CCRI Tongan(Beijing)Intelligent Control Technology Corporation Ltd.,Beijing 100013,China;China Coal Research Institute Corporation Ltd.,Beijing 100013,China;Beijing Engineering and Research Center of Mine Safe,Beijing 100013,China;National Key Laboratory of Intelligent Coal Mining and Rock Strata Control,Beijing 100013,China;Institute of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]煤科通安(北京)智控科技有限公司,北京100013 [2]煤炭科学技术研究院有限公司,北京100013 [3]北京市煤矿安全工程技术研究中心,北京100013 [4]智能开采与岩层控制全国重点实验室,北京100013 [5]内蒙古科技大学矿业与煤炭学院,内蒙古包头014010

出　　处：《煤质技术》2024年第4期8-14,共7页Coal Quality Technology

基　　金：煤炭科学技术研究院有限公司科技发展基金资助项目(2023CX-I-16)。

摘　　要：煤分子结构特性是研究煤氧化自燃过程和煤自燃机理的基础,即煤低温氧化过程中煤分子结构变化规律是解释煤自燃原因的根本途径,不同温度的煤表面官能团变化规律研究对探究煤自燃特性具有重要意义。以雁南褐煤、红阳焦煤与南阳坡无烟煤为研究对象,采用程序升温实验方法,测试煤低温氧化过程中气体产物生成规律,采用傅里叶变换红外光谱法(FTIR)分析不同变质程度煤的微观化学结构特征,并探究温度对煤分子表面官能团的影响,从宏观和微观上揭示、表征煤自燃的内在属性。研究表明:在煤低温氧化过程中,气体产物生成量随温度的升高而逐渐增大,煤分子结构断裂,芳香核缩合;随着煤变质程度的加深,气体产物生成量减小,煤分子表面的含氧官能团含量减少,活性降低,煤自燃能力减弱;随着温度的增加,煤分子表面甲基、亚甲基整体呈增加趋势,羟基整体呈现出先减后增再减趋势,羧基、羰基呈现增加趋势。The characteristic of coal molecular structure is the basis for studying the process of coal oxidation and spontaneous combustion and the mechanism of coal spontaneous combustion,the change law of middling coal molecular structure in the process of coal low-temperature oxidation is the fundamental way to explain the cause of coal spontaneous combustion,which is of great significance to the study of coal spontaneous combustion characteristics.Taking Yannan lignite,Hongyang coking coal and Nanyangpo anthracite as the research objects,the temperature programmed system was used to test the law of gas product formation during low temperature oxidation of coal.The microstructure characteristics of coal with different metamorphic degrees were analyzed by Fourier transform infrared spectroscopy(FTIR).The influence of temperature on the surface functional groups of coal molecules was explored.The intrinsic properties of coal spontaneous combustion were revealed and characterized from macro and microscopic.The results shows that:the amount of gas products increased with the increase of temperature,the molecular structure of coal was broken and aromatic nucleus condensation was carried out in the process of coal oxidation at low temperature.With the deepening of coal metamorphism,the amount of gas products decreased,the content of oxygen-containing functional groups on the surface of coal molecules decreased,the activity decreased,and the spontaneous combustion ability of coal weakened.With the increase of temperature,the methyl and methylene groups on coal molecular surface increased as a whole,the hydroxyl groups decreased at first,then increased and then decreased,and the carboxyl and carbonyl groups increased.

关 键 词：煤自燃 产物特性 官能团 程序升温实验 红外光谱 芳香核 气体产物生成量 

分 类 号：TQ530[化学工程—煤化学工程] TD752.2[矿业工程—矿井通风与安全]