煤自燃热效应对采空区瓦斯分布的影响机理  

The Influence Mechanism of Heat Effect of Coal Spontaneous Combustion on Gas Distribution in Goaf

作　　者：凌紫城 施式亮 鲁义[1] 李贺 张巨峰 LING Zicheng;SHI Shiliang;LU Yi;LI He;ZHANG Jufeng(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201

出　　处：《矿业工程研究》2023年第2期58-64,共7页Mineral Engineering Research

基　　金：国家自然科学基金资助项目(51974120;52274196)。

摘　　要：利用自主设计搭建的三维采空区流场模拟试验装置,开展煤自燃升温模拟试验.结果表明:(1)随热源温度升高,高温范围沿X轴,Y轴向外延伸;某点温度与距热源距离呈负相关;同一位置温度随时间呈指数增大;(2)自燃后发生瓦斯积聚现象,第Ⅰ层出现在热源处,Ⅱ,Ⅲ层在热源沿倾向偏10 cm处;热源附近瓦斯低体积分数区域随升温扩大;采空区深部瓦斯体积分数在竖直方向上从低平面到高平面分别呈下降、持平、升高趋势.分析得到:瓦斯积聚是热源产生的升浮力与抽吸力共同作用的结果;积聚点偏移是向上的升浮力受到了水平漏风风流的影响;升浮强度与抽吸强度均随温度升高而增大,但在不同高度平面存在不同关系.A three-dimensional goaf flow field simulation test device is designed and built independently to simulate coal spontaneous combustion and temperature rise.The results show that:(1)With the increase of heat source temperature,the high temperature range extends outwards along X axis and Y axis.The temperature at a certain point is negatively correlated with the distance from the heat source.The temperature at the same position increases exponentially with time.(2)Gas accumulation occurs after spontaneous combustion.The first layer appears at the heat source,and the second and third layers are 10 cm away from the heat source.The region of low concentration near the heat source expands with temperature rise.The deep concentration of goaf shows a decreasing,flat and increasing trend from low to high plane.Gas accumulation is the result of lifting force and suction force produced by heat source.The accumulation point deviation is that the upward buoyancy is affected by the horizontal air leakage flow.The buoyancy strength and suction strength both increase with the increase of temperature,but there are different relationships at different heights.

关 键 词：煤自燃 热效应 模拟试验 瓦斯分布 影响机理 

分 类 号：X936[环境科学与工程—安全科学]