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。
In order to better use oxygen index for early warning of goaf spontaneous combustion accidents,numerical method is used to study the dynamic response mechanism of oxygen distribution on spontaneous combustion stage. The calculated results show that oxygen area becomes wedge- shape structure in early stage,and oxygen distribution can shrink back forward with increasing temperature.Then,the oxidation area width divided by oxygen or temperature index appears three stages which presents overlapping in the second stage. Oxidation area position presents different changing trend when air leakage strength is changed. The oxygen distribution dynamic response mechanism with temperature must be grasped in site,the oxygen index should be applied in early spontaneous combustion stage but the temperature index should be applied in latter stage.
出处
《煤矿安全》
CAS
北大核心
2015年第7期24-27,共4页
Safety in Coal Mines
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)
关键词
氧气指标
数值方法
采空区
氧化带
自燃
oxygen index
numerical method
goaf
oxidizing area
spontaneous combustion
