煤微晶结构与热解动力学的自燃倾向性研究  

Study on Spontaneous Combustion Tendency of Coal Microcrystalline Structure and Pyrolysis Kinetics

作　　者：李亚欣 张渝 朱令起 胡社荣[3] LI Yaxin;ZHANG Yu;ZHU Lingqi;HU Sherong(School of Emergency Management and Safety Engineering,North China University of Science and Technology,Tangshan 063210,China;Hebei Provincial Key Laboratory of Mining Development and Safety Technology,Tangshan 063210,China;School of Earth Science and Surveying Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]华北理工大学应急管理与安全工程学院,河北唐山063210 [2]河北省矿业开发与安全重点实验室,河北唐山063210 [3]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《煤炭技术》2024年第8期202-207,共6页Coal Technology

摘　　要：为系统探讨煤的微晶结构、变质程度与煤的热解动力学对煤自燃活化能的影响,选用不同变质程度的煤样作为研究对象,采用XRD分析、绝氧热重以及程序升温实验,基于逐步回归分析法对煤的微晶结构参数、煤质参数、交叉点温度进行分析,预测煤自燃的数学模型。基于特征温度点以及活化能的计算,分析微晶结构与热解行为之间的关系。结果表明:随煤变质程度的增大,层间距d_(002)逐渐减小,煤化度P、堆砌高度L_(c)和堆砌层数N整体呈现增大的趋势;L_(c)和L_(a)可以解释交差点温度变化且对其产生负影响关系,预测模型为交叉点温度=210.409-2.575L_(c)-12.700L_(a)(R^(2)=1.000);T_(p)随煤变质程度和堆砌高度L_(c)的增大而增大,随层间距d_(002)增大而减小;活化能E随煤级增大而增大,燃烧特性降低。活化能E随着芳香性f_(a)的增加和层间距d_(002)的减小而逐渐增大,微晶结构的有序化能使煤的燃烧反应特性下降。To systematically explore the effects of coal microcrystalline structure,degree of metamorphism,and coal pyrolysis kinetics on the activation energy of coal spontaneous combustion,coal samples with different degrees of metamorphism were selected as the research object.XRD analysis,oxygen insulated thermogravimetric experiment,and programmed temperature rise experiment were used to analyze the microcrystalline structure parameters,coal quality parameters,and intersection temperature of coal based on stepwise regression analysis,and predict the mathematical model of coal spontaneous combustion.The relationship between microstructure and pyrolysis behavior was analyzed based on the calculation of characteristic temperature points and activation energy,and the influence of modification degree on activation energy was explored.The results indicate that the degree of coal metamorphism is a key f_(a)ctor affecting the microstructure of coal.As the degree of coal metamorphism increases,the interlayer spacing d_(002)gradually decreases,and the overall coalification degree P,stacking height L_(c),and stacking layer N show an increasing trend;L_(c)and L_(a)can explain the temperature changes at the intersection point and have a negative impact on it.the prediction model is the intersection point temperature=210.409-2.575L_(c)-12.700L_(a)(R^(2)=1.000);the main factors affecting T_(p)are the degree of metamorphism and microcrystalline structure parameters.T_(p)increases with the increase of coal metamorphism degree and stacking height L_(c),and decreases with the increase of interlayer spacing d_(002);the influencing factors of activation energy include the degree of metamorphism and microcrystalline structure parameters.The activation energy E increases with the increase of coal grade,while the combustion characteristics decrease.The activation energy E gradually increases with the increase of aromaticity f_(a)and the decrease of interlayer spacing d_(002),indicating that the ordered microcrystalline structure can reduce the

关 键 词：自燃倾向性 XRD 交叉点温度 热解动力学 活化能 

分 类 号：TD752.2[矿业工程—矿井通风与安全]