陕北侏罗纪煤氧化自燃特性实验研究
发布时间：2018-08-24 12:07
【摘要】：我国西北地区侏罗纪煤层储量丰富，厚度大、煤质优、变质程度较低，自然发火现象较为严重。本论文以陕北侏罗纪煤为研究对象，采用理论分析与实验研究相结合的方法，对侏罗纪煤氧化过程中的微观及宏观特性进行了研究，研究结果对侏罗纪煤自燃机理的揭示、煤自燃预测预报及防治技术研究提供了一定的理论依据。 采用工业分析仪、元素分析仪、X-射线衍射仪和傅里叶红外光谱仪等，分析了陕北侏罗纪煤的煤质组成、芳香微晶结构和官能团特征，，掌握了陕北侏罗纪煤的物理化学结构特性。 通过对陕北侏罗纪煤的同步热分析实验，分析得出了表征煤自燃特性的5个特征温度，并对氧化过程中的水分蒸发及脱附阶段和吸氧增重阶段进行了热分析动力学分析，掌握了陕北侏罗纪煤氧化过程中表观活化能及指前因子等动力学参数，找出了满足Bagchi法的侏罗纪煤氧化过程最概然机理函数。 针对陕北侏罗纪煤氧化过程中的特征温度，利用傅里叶变换红外光谱仪分析了煤分子结构中官能团的变化规律，确定出侏罗纪煤分子结构中对氧化反应影响较大的活性官能团。 通过分析陕北侏罗纪煤自燃程序升温过程中耗氧速率、气体产生率和放热强度等宏观自燃特性参数，并与其他成煤时期煤样对比，结合氧化自燃过程中的动力学参数及活性官能团变化规律分析，从微观阐明了陕北侏罗纪煤氧化自燃过程。
[Abstract]:Jurassic coal seams in northwest China are rich in reserves, large in thickness, excellent in coal quality, low in metamorphism and serious in spontaneous combustion. In this paper, the microscopic and macroscopic characteristics of Jurassic coal oxidation process are studied by combining theoretical analysis with experimental research. The results reveal the mechanism of Jurassic coal spontaneous combustion. The prediction, prediction and prevention technology of coal spontaneous combustion provide some theoretical basis. The composition of coal, aromatic microcrystalline structure and functional group characteristics of Jurassic coal in northern Shaanxi were analyzed by means of industrial analyzer, element analyzer, X-ray diffractometer and Fourier transform infrared spectrometer. The physical and chemical structure characteristics of Jurassic coal in northern Shaanxi were mastered. Through the simultaneous thermal analysis experiment of Jurassic coal in northern Shaanxi, five characteristic temperatures were obtained to characterize the spontaneous combustion characteristics of coal, and the kinetic analysis of water evaporation and desorption stage and oxygen absorption weight gain stage in the oxidation process was carried out. The kinetic parameters such as apparent activation energy and preexponential factors in the process of Jurassic coal oxidation in northern Shaanxi were grasped and the most probable mechanism function of Jurassic coal oxidation process satisfying Bagchi method was found. In view of the characteristic temperature in the process of coal oxidation in the Jurassic of northern Shaanxi, the functional groups in the coal molecular structure were analyzed by Fourier transform infrared spectroscopy, and the active functional groups which had great influence on the oxidation reaction in the Jurassic coal molecular structure were determined. The characteristics of oxygen consumption rate, gas production rate and exothermic intensity in the process of temperature programmed spontaneous combustion of Jurassic coal in Northern Shaanxi are analyzed, and compared with other coal samples during coal-forming period. Based on the analysis of the kinetic parameters and the changes of active functional groups in the process of oxidation spontaneous combustion, the process of oxidation spontaneous combustion of Jurassic coal in northern Shaanxi was elucidated from the microcosmic point of view.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD752.2
本文编号：2200777
[Abstract]:Jurassic coal seams in northwest China are rich in reserves, large in thickness, excellent in coal quality, low in metamorphism and serious in spontaneous combustion. In this paper, the microscopic and macroscopic characteristics of Jurassic coal oxidation process are studied by combining theoretical analysis with experimental research. The results reveal the mechanism of Jurassic coal spontaneous combustion. The prediction, prediction and prevention technology of coal spontaneous combustion provide some theoretical basis. The composition of coal, aromatic microcrystalline structure and functional group characteristics of Jurassic coal in northern Shaanxi were analyzed by means of industrial analyzer, element analyzer, X-ray diffractometer and Fourier transform infrared spectrometer. The physical and chemical structure characteristics of Jurassic coal in northern Shaanxi were mastered. Through the simultaneous thermal analysis experiment of Jurassic coal in northern Shaanxi, five characteristic temperatures were obtained to characterize the spontaneous combustion characteristics of coal, and the kinetic analysis of water evaporation and desorption stage and oxygen absorption weight gain stage in the oxidation process was carried out. The kinetic parameters such as apparent activation energy and preexponential factors in the process of Jurassic coal oxidation in northern Shaanxi were grasped and the most probable mechanism function of Jurassic coal oxidation process satisfying Bagchi method was found. In view of the characteristic temperature in the process of coal oxidation in the Jurassic of northern Shaanxi, the functional groups in the coal molecular structure were analyzed by Fourier transform infrared spectroscopy, and the active functional groups which had great influence on the oxidation reaction in the Jurassic coal molecular structure were determined. The characteristics of oxygen consumption rate, gas production rate and exothermic intensity in the process of temperature programmed spontaneous combustion of Jurassic coal in Northern Shaanxi are analyzed, and compared with other coal samples during coal-forming period. Based on the analysis of the kinetic parameters and the changes of active functional groups in the process of oxidation spontaneous combustion, the process of oxidation spontaneous combustion of Jurassic coal in northern Shaanxi was elucidated from the microcosmic point of view.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD752.2
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