Distribution of spontaneous combustion "three-zone" in fully mechanized golf under the condition of gas drainage
LI Yan-zeng · Journal of Xi'an University of Science and Technology · 2008
Based on the characteristics of fully mechanized golf under the condition of gas drainage,the spontaneous combustion danger zone of fully mechanized golf under the condition of gas drainage is judged.By making use of the self-ignition experiment oven,three important parameters of oxygen consumption,intensity of heat transmission and the shortest coal ignition of the coal sample of Xiashijie mine in Tongchuan city are obtained,which can provide basic data for numeric simulation of seepage filed in the gob under the condition of gas drainage.A mathematical model of seepage,oxygenation and diffusion in the gob under the condition of gas drainage are set up,and numeric simulation of oxygen concentration and intensity of air leakage can be obtained.The minimum moving velocity of the workface not to cause spontaneous combustion are determined.The study provides guidance for prediction and prevention of spontaneous combustion in high gas coal mine.