不同风量下采空区自燃三带判定及防灭火技术

Spontaneous combustion three zones determination and fire control technology in goaf under different ventilation volume

为了研究不同风量下采空区自燃三带的范围变化,以磁窑沟煤矿10-2煤层为研究对象,采用数值模拟分析了不同风量下采空区的自燃三带的变化规律。结果表明:随风量的增加,氧化带的边界向采空区深部延伸,距工作面的距离也逐渐加大;工作面风量的影响由大到小依次为:回风巷侧、进风巷侧、采空区中部;且回风巷远离工作面的边界较进风巷侧、采空区中部受风量影响大得多。根据研究结果及现场实际提出采用高强复合发泡堵漏防灭火技术,采用该封堵技术可使采空区氧化带向工作面靠近,并且在相同风量条件下进行封堵比未进行封堵时氧化带的宽度明显减小。

In order to have the study on scope variations of spontaneous combustion three zones in goal under different ventilation volume, taking No. 10-2 seam in Ciyaogou Mine as a study object, the variation law of the spontaneous combustion three zones in the goal under different ventilation volume was studied with numerical simulation.The result showed that,with the ventilation volume increased, a boundary of the oxidized zone would be expanded to a deep section of the goal and the distance to the coal mining face would he steadily increased.The ventilation influence of the coal mining face would be in a sequence from high to low, they were sides of an air returning gateway, sides of the air intake gateway and middle of the goaf.The air retuuing gateway with a far distance to the boundary of coal mining face would have higher ventilation volume influences than the sides of the air intake gateway and the middle of the goaf.According to the study results and the site practices, an application of a high power complex foaming air leakage sealing and fire prevention technology was provided.The application of the sealing technology could make an oxidized zone in the goaf closed to the coal mining face.Under conditions of the same ventilation volume, the width of the oxidized zone with the sealing technology applied would be obviously reduced than the width of oxidized zone with no sealing technology applied.