【摘要】：我國西北地區(qū)侏羅紀煤層儲量豐富，厚度大、煤質優(yōu)、變質程度較低，自然發(fā)火現(xiàn)象較為嚴重。本論文以陜北侏羅紀煤為研究對象，采用理論分析與實驗研究相結合的方法，對侏羅紀煤氧化過程中的微觀及宏觀特性進行了研究，研究結果對侏羅紀煤自燃機理的揭示、煤自燃預測預報及防治技術研究提供了一定的理論依據(jù)。 采用工業(yè)分析儀、元素分析儀、X-射線衍射儀和傅里葉紅外光譜儀等，分析了陜北侏羅紀煤的煤質組成、芳香微晶結構和官能團特征，，掌握了陜北侏羅紀煤的物理化學結構特性。 通過對陜北侏羅紀煤的同步熱分析實驗，分析得出了表征煤自燃特性的5個特征溫度，并對氧化過程中的水分蒸發(fā)及脫附階段和吸氧增重階段進行了熱分析動力學分析，掌握了陜北侏羅紀煤氧化過程中表觀活化能及指前因子等動力學參數(shù)，找出了滿足Bagchi法的侏羅紀煤氧化過程最概然機理函數(shù)。 針對陜北侏羅紀煤氧化過程中的特征溫度，利用傅里葉變換紅外光譜儀分析了煤分子結構中官能團的變化規(guī)律，確定出侏羅紀煤分子結構中對氧化反應影響較大的活性官能團。 通過分析陜北侏羅紀煤自燃程序升溫過程中耗氧速率、氣體產生率和放熱強度等宏觀自燃特性參數(shù)，并與其他成煤時期煤樣對比，結合氧化自燃過程中的動力學參數(shù)及活性官能團變化規(guī)律分析，從微觀闡明了陜北侏羅紀煤氧化自燃過程。
[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.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD752.2

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