摘要
针对综放工作面煤巷周围破碎煤体潜在的自燃问题,以南山矿18-5综放工作面回风煤巷为研究对象,对仅存在巷道漏风源条件的煤巷周围破碎煤体氧气与温度分布特征进行了数值模拟,并对注氮和封堵防火的效果进行理论预测。结果表明:氧气从煤巷新风入口向周边破碎煤体发生渗流,渗流范围沿走向随漏风风压损失呈缩减趋势;高温区位于距漏风边界一定距离的煤柱中部,并逐渐上移至顶煤附近;封堵和注氮对自燃具有不同的抑制作用,二者配合使用在局部可获得较好的防火效果。数值模拟结果与现场监测结果相符。
According to the potential spontaneous combustion problem of the broken coal left around the coal drift in fully-mechanized top coal caving face, taking the air returning gateway of No. 18-5 fully-mechanized top coal caving face in Nanshan Mine as a study object, a numerical simulation was conducted on the oxygen and temperature distribution features of the broken coal around the coal drift with the only condition of ventilation leakage source. A theoretical prediction was conducted on the fire prevention effect of nitrogen injection and gateway sealing.The results showed that seepage would occur when the oxygen with fresh air ventilation flowed from the coal drift entry to the broken coal around.The seepage scope along the strike would be in a reduced tendency with the ventilation air leakage pressure lost. The high temperature area was in the middle of the coal pillar with a certain distance to the air leakage boundary and would be steadily up- ward moved to a location around the top coal.The gateway sealing and nitrogen injection in the gateway would have different restricted functions to the spontaneous combustions.The coordinated application of sealing and nitrogen injection locally could have good fire prevention effects.The numerical simulation results and the site monitored and measured results would be well fitted.
出处
《煤炭科学技术》
CAS
北大核心
2013年第11期75-78,共4页
Coal Science and Technology
基金
2013年河南省科技攻关计划资助项目(132102210448)
关键词
破碎煤体
注氮
自燃
防火
broken coal
nitrogen injection
spontaneous combustion
fire prevention
