采空区瓦斯涌出源位置对瓦斯浓度及自燃带分布的影响

发布时间：2019-03-18 18:30

【摘要】：利用Fluent软件,对采空区瓦斯为采空区整个区域涌出和上、下临近层及底板遗煤处同时涌出两种情况下的流场进行了数值模拟,并分析了采空区瓦斯体积分数及自燃带分布规律。结果表明:当采空区整个区域瓦斯涌出时,采空区瓦斯体积分数由底板到顶板垂直方向上呈逐渐升高的趋势;当上、下临近层及底板遗煤处瓦斯同时涌出时,采空区瓦斯体积分数在靠近底板和顶板位置处较高,中间区域处较低。与采空区整个区域瓦斯涌出相比,当上、下临近层及底板遗煤处瓦斯同时涌出时,在采空区底板处,自燃带更靠近工作面;在采空区底板和顶板中间位置处,自燃带远离工作面;在采空区顶板处,自燃带位置几乎没有变化。
[Abstract]:By using Fluent software, the flow field of goaf gas gushing out from the whole area of goaf is simulated, and the gas volume fraction and the distribution of spontaneous combustion zone in goaf are analyzed under two conditions: the gas gushing out of the goaf at the same time, and the gas volume fraction in the goaf and the distribution rule of the self-ignition zone at the same time. The results show that the gas volume fraction of goaf increases gradually from the floor to the vertical direction of roof when the whole area gas gushes out. The gas volume fraction in goaf is higher near the floor and roof, and lower in the middle area when the gas is emitted simultaneously from the bottom layer and the bottom coal residue at the upper and lower side of the coal mine. The gas volume fraction in the goaf is higher than that near the floor and roof. Compared with the gas emission from the whole area of goaf, the spontaneous combustion zone is closer to the working face when the gas gushes out at the bottom of the goaf and the bottom coal at the bottom of the goaf at the same time, when the gas gushes out at the bottom of the goaf. The spontaneous combustion zone is far away from the working face at the middle position between the floor and roof of the goaf, and the position of the self-ignition zone is almost unchanged at the roof of the goaf.
【作者单位】：河南理工大学安全科学与工程学院;河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培育基地;
【基金】：国家自然科学基金项目(51174079) 国家重点基础研究发展计划“973”项目(2012CB723103) 教育部“长江学者和创新团队发展计划”创新团队项目(IRT1235)
【分类号】：TD712

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