摘要
基于漏风渗流方程、多组分气体混溶-扩散方程和综合传热方程,建立采空区瓦斯和自燃耦合数学模型.通过现场实测获得基础数据,用G3程序(有限元数值方法)求解了在煤耗氧和瓦斯涌出共同环境下采空区瓦斯-氧浓度及温度的分布.结果表明,在单纯瓦斯涌出(无消耗氧)条件下,采空区氧被瓦斯稀释现象比较显著;采空区内高强度的瓦斯涌出能够使自燃氧化区域进一步缩小,削弱了煤的自燃氧化进程;自燃产生的热风压也能加剧工作面向采空区的漏风及对采空区内瓦斯的排放.耦合影响随工作面向采空区的漏风量的提高而相对降低.
A coupling mathematical model of coal spontaneous combustion and gas effusion in the goal was developed based on an air seepage continuity equation, a mixing-diffusion equation and an integral heat transfer equation of the gas mixture. The distribution of gas, oxygen and temperature in the goal under conditions where oxygen is consumed and gas is effusing were obtained by numerical simulation methods. The results show that the oxygen in the goal was diluted by gas effusion, that the spontaneous combustion zone was reduced and the process of spontaneous combustion was weakened when a high intensity of gas effusion from the goal was present and that air leakage from the working face to the goal and gas drainage from the goal were increased by the high air pressures caused by spontaneous combustion. The coupling between effusion and spontaneous combustion decreased as air leakage from the working face to the goal increased.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2008年第1期38-42,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(50574038)
关键词
采空区
多组分气体
温度场
瓦斯涌出与自燃耦合
有限元
goaf
mixture gas
temperature field
coupling of methane and spontaneous combustion
finite element
