采空区自燃过程中氧气场分布的动态特征研究

发布时间：2018-05-07 18:37

本文选题：氧气指标 + 数值方法　；参考：《煤矿安全》2015年07期

【摘要】：为了更好地利用氧气指标对采空区自燃事故进行预警,利用数值方法对采空区氧气分布对于自燃阶段发展的动态响应机制进行了研究,结果表明:自燃初期,以氧气为指标的氧化带形成"楔形"分布结构;氧气分布会随温度的升高大面积回缩前移;以温度指标和氧气指标划分的氧化带宽度变化均呈现3个阶段,二者在各自的第2阶段出现重叠;改变漏风强度后会导致自燃带位置呈不同的变化趋势。现场需要把握氧气分布随温度的动态响应趋势,在自燃初期适合采用氧气指标,但在自燃中后期,宜采用温度指标划分氧化带位置。
[Abstract]:In order to make better use of oxygen index to forewarn the spontaneous combustion accident in goaf, the dynamic response mechanism of oxygen distribution in goaf to the development of spontaneous combustion stage is studied by using numerical method. The results show that: at the initial stage of spontaneous combustion, the dynamic response mechanism of oxygen distribution in goaf to the development of spontaneous combustion stage is studied. The oxidation zone with oxygen as the index forms a "wedge-shaped" distribution structure; the oxygen distribution retracts forward with the increase of temperature, and the width of the oxidation zone divided by the temperature index and the oxygen index presents three stages. They overlap in the second stage, and the change of the air leakage intensity will lead to different trends of the spontaneous combustion zone position. It is necessary to grasp the dynamic response trend of oxygen distribution with temperature in the field, so it is suitable to use oxygen index in the initial stage of spontaneous combustion, but in the middle and late stage of spontaneous combustion, the temperature index should be used to divide the oxidation zone position.
【作者单位】：河南理工大学能源科学与工程学院;河南工程学院安全工程学院;
【基金】：国家自然科学基金资助项目(51404089) 2013河南省科技攻关计划资助项目(132102210448)
【分类号】：TD752.2

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