基于流场模拟的综放面自燃危险区域划分及预测

通过对采空区渗流场的数值模拟,得到采空区渗流速度及氧气体积分数的分布.结合实验测得的煤自燃发火期和自燃临界参数,对采空区"三带"进行划分,并得到了采空区不自燃的工作面最小推进度.该方法计算量比模拟采空区煤自燃全过程少得多,预测精度却能够满足实际防灭火需要.

Partition of spontaneous combustion dangerous zone and prediction of spontaneous combustion based on numerically modeling the flow field at fully mechanized caving face

The distribution of oxygen concenlration and the velocity of air flow in a mined-out area were determined by numerically simulating the flow field. With the simulated results together with the duration and threshold of coal spontaneous combustion obtained from experiments, the spontaneous combustion dangerous zone was partitioned into three zones, and the smallest working face moving velocity to prevent spontaneous combustion was calculated. Compared with the simulation of the whole process of coal spontaneous combustion in a mined-out area, this proposed method requires a smaller amount of calculations, but its precision can satisfy the demand to predict and prevent spontaneous combustion in the mined-out area.