【作者】 车强；

【导师】 周心权；

【作者基本信息】 中国矿业大学（北京） ， 安全技术及工程， 2010， 博士

【摘要】 采空区存在的遗煤易自燃，为瓦斯爆炸提供了长期存在的火源，易引发继发性瓦斯爆炸本文以采空区瓦斯-空气混合气体中的CH₄、O₂、CO、CO₂和N₂等主要组分为研究对象，在现场实测煤矿采空区气体的浓度和温度等参数的基础上，通过理论分析、实验验证和三维CFD模拟的方法，系统研究了遗煤自燃前后采空区气体组分的流动和传热的变化规律。通过采空区多孔介质气测渗透率的测定实验分析了采空区冒落带渗透率的分布规律。通过采空区瓦斯渗流和传热的大尺寸实验测定了采空区瓦斯的浓度分布、压力分布和温度分布。建立了采空区多孔介质的孔隙率和渗透率的空间分布方程，完善了采空区的物理模型和采空区气体流动的CFD模拟数学模型，并通过解算得出遗煤自燃前后采空区气体组分的三维渗流场、浓度场和温度场的多场耦合变化规律。数值模拟结果与实验结果以及现场观测结果都相互符合较好。本文研究工作对采空区瓦斯抽放、遗煤自燃以及继发性瓦斯爆炸的防治具有较大的指导意义。更多还原

【Abstract】 Residual coal in goaf easily cause spontaneous combustion, and provide a long-term existence fire source, then easily lead to secondary gas explosion. Taking CH4_, O₂, CO, CO₂ and N₂ constituents in goaf gas-air mixed gas as the research object, on the basis of measurement of gas concentration and temperature in mine goaf, this dissertation has a systematic study on the law of gas flow and heat transfer in goaf pre-and post spontaneous combustion of residual coal by theoretical analysis, experimental verification and numerical simulation. Gas permeability distribution in goaf seepage is summarized in permeability determination experiments. Large-scale goaf gas seepage and heat transfer experiments are practiced and gas concentration distribution, pressure distribution and temperature distribution in goaf seepage are summarized. The space equations of porosity and permeability in the goaf porous media are established, and the 3D goaf physical model is constructed, and the goaf gas mathematical models are improved. And multi-field coupling changed law of gas-air mixed gas 3D seepage field, concentration field and temperature field pre-and post spontaneous combustion of residual coal in goaf have been obtained by discreting mathematical model equations. The numerical simulation results coincide well with experimental results and site observation data. The dissertation has great significance on goaf gas drainage, prevention of residual coal spontaneous combustion and secondary gas explosion.更多还原