综放面自燃危险区域及最小推进速度的确定

Determining technique of spontaneous combustion hazard zone in the gob of fully mechanized longwall top-coal caving face

通过实验测定煤的自燃特性参数 ;由现场观测和理论分析确定综放面采空区浮煤、漏风和氧浓度的分布情况 ,然后根据实际条件下浮煤自燃的极限参数 ,将采空区划分为窒熄带、氧化升温带和散热带 ;最后根据综放面实际推进速度和最短自然发火期判定出采空区自燃危险区域 。

The spontaneous combustion characteristic parameters are evaluated using the self ignition experiment oven. Based on the actual survey in the workface, the distributions of the remain coal, the intensity of air leakage and the oxygen concentration in the gob are obtained. And then the three zones are determined according to the actual values of the limit parameters. Finally, on the basis of the shortest self ignition term of coal and the speed of the workface advancing, the spontaneous combustion hazard zone in the gob are determined and the minimum safe speed of face advancing is evaluated.