煤自燃阶段特征及采空区自燃区域变化规律研究
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摘要
为研究煤自燃机理及其阶段变化特征,通过理论分析煤自燃过程、探讨煤层自燃的基本条件、煤自燃阶段特征。通过程序升温、绝热氧化和TG-FTIR实验对比研究不同煤种低温阶段指标气体的变化特征、煤自燃倾向性和高温阶段煤燃烧过程的热重变化、气体释放规律,以此研究煤自燃各阶段中反应和结构特性,并为采空区自燃“三带”数值模拟提供放热源、耗氧源等数据支持。结合兴陶煤矿回采工作面上覆岩层裂隙发育模拟,按区域计算了采空区渗透系数,并在前人基础上,总结了采空区渗透系数分布规律,为采空区渗透率场模拟提供数据支撑。论文在理论分析基础上,建立采空区煤自燃数学模型,并结合Visual C++开发了可视化采空区火源定位数值模拟软件V1.0,辅以实验基础数据,模拟不同情况下采空区自燃区域的变化情况,并提出煤自燃综合防治方案。研究结果表明：通过煤的元素分析可以预测煤各阶段特征点及其气体浓度,自燃数值模拟为采空区防灭火提供可靠的决策方案,为采空区自燃的预测、预防、预报及治理提供理论支撑。
In order to study mechanism of phase variation of the coal spontaneous combustion, researched the process of coal spontaneous combustion, explored the basic conditions of the coal seam spontaneous combustion, coal combustion process and geological features of the shallow Tibet seam by theoretical analysis. By the experimental of temperature programmed、adiabatic oxidation、and the TG-FTIR to comparison and study the variation of the indicator gas in the low-temperature phase of the different coals、TGA variation of coal spontaneous combustion tendency and high-temperature phase of the coal combustion process、characteristics of disasters gas characteristics of changes. So study of coal spontaneous combustion reactions and structural properties of the various stages based on the different experiments, and provide data support such as heat source、oxygen source for numerical simulation of Gob "three zones". By the combination of Xing Tao coal mining work surface overlying rock fissures simulation, analysis the permeability coefficient of variation of goaf area (fractured zone, the caving zone, the deformation zone), to reveal the main air leakage characteristics of the mine. According to goaf seam tendency (horizontal) direction, established a mathematical model of permeability coefficient of variation, provide data support for the goaf penetration field simulation. Based on the theoretical analysis in papers, established coal spontaneous combustion mathematical model of goaf, and combined with Visual C++development visualization goaf fire localization numerical simulation software V1.0, by the experimental basis data, simulation the different circumstances changes of spontaneous combustion region, and found a comprehensive prevention and treatment programs for the coal spontaneous combustion. The results show that:by the elemental analysis of coal can be predicted coal various stages of feature points and their gas concentration, provide a reliable decision-making for fire prevention of the goaf by numerical Simulation, and provide the management theory and technical support for the goaf's prediction, prevention, forecasting.
In order to study mechanism of phase variation of the coal spontaneous combustion, researched the process of coal spontaneous combustion, explored the basic conditions of the coal seam spontaneous combustion, coal combustion process and geological features of the shallow Tibet seam by theoretical analysis. By the experimental of temperature programmed、adiabatic oxidation、and the TG-FTIR to comparison and study the variation of the indicator gas in the low-temperature phase of the different coals、TGA variation of coal spontaneous combustion tendency and high-temperature phase of the coal combustion process、characteristics of disasters gas characteristics of changes. So study of coal spontaneous combustion reactions and structural properties of the various stages based on the different experiments, and provide data support such as heat source、oxygen source for numerical simulation of Gob "three zones". By the combination of Xing Tao coal mining work surface overlying rock fissures simulation, analysis the permeability coefficient of variation of goaf area (fractured zone, the caving zone, the deformation zone), to reveal the main air leakage characteristics of the mine. According to goaf seam tendency (horizontal) direction, established a mathematical model of permeability coefficient of variation, provide data support for the goaf penetration field simulation. Based on the theoretical analysis in papers, established coal spontaneous combustion mathematical model of goaf, and combined with Visual C++development visualization goaf fire localization numerical simulation software V1.0, by the experimental basis data, simulation the different circumstances changes of spontaneous combustion region, and found a comprehensive prevention and treatment programs for the coal spontaneous combustion. The results show that:by the elemental analysis of coal can be predicted coal various stages of feature points and their gas concentration, provide a reliable decision-making for fire prevention of the goaf by numerical Simulation, and provide the management theory and technical support for the goaf's prediction, prevention, forecasting.
引文
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