Dimensionless Model to Determine Spontaneous Combustion Danger Zone in the Longwall Gob
According to spontaneous combustion propensity, the longwall gob is divided into three zones, including heat dissipation zone, self-heating zone and the choking zone. Only in the self-heating zone can temperature of coal rise due to oxidation. Studying the distribution of the three zones in gob is important for predicting and preventing spontaneous combustion in coal mine. In normal mining operations, temperature of coal is roughly constant. The process of mass transfer in the gob is considered to be steady. Based on mass conservation, gas species conservation, Darcys law, Ficks law of diffusion and coal oxidation 1-grade reaction rule, governing equation for air leakage intensity and species concentration are deduced. With critical value of coal spontaneous combustion and the size of longwall workface as basic dimension, a dimensionless steady coupled model of air flow diffusion and chemical reaction in loose coal of Fully Mechanized Top-Coal Caving Mining Workface (FMTCCMW) is setup. By solving the model numerically, regulation of three zones distribution and spontaneous combustion in the gob can be obtained. The results can be easily popularized to prediction of spontaneous combustion in other coal mines longwall gob.
fully mechanized top-coal caving workface spontaneous combustion dimensionless model
ZHANG Xin-hai DENG Jun WEN Hu
School of Energy Engineering, Xian University of Science and Technology, Xian 710054, China
国际会议
The 2nd International Conference on Mine Safety and Environment Protection(第二届采矿、安全与环境保护国际会议)
西安
英文
83-88
2011-10-10（万方平台首次上网日期，不代表论文的发表时间）