The Theoretical Prediction Model of Reasonable Pre-draining Time of Gas in Coal Seam
In order to plan pre-draining time of gas from extracting seam reasonably, coal seam is counted as double media with pores and cracks. Considering seepage, diffusion and desorption process of gas, the gas flow equation is built up. The solver with MATLAB is work out, and the prediction method of reasonable pre-draining time is discussed. The solver is applied in workface of 4* coal seam of north area of Sha qu mine, and gas pre-draining rate curve is obtained with time in different holes space. The results show that in same pre-draining time, the smaller holes space is, the greater gas pre-draining rate is. Under the condition of 5m holes space, and in the demand of 30％ pre-draining rate, the reasonable pre-draining time is 200d, which is close to the actual result. The theoretical method does not need drilling in the field, which could reduce on-site work and avoid the problem such as drilling and sealing quality, uneven distribution of gas and others, as provide dependable basis for gas pre-draining management.
gas pre-draining gas seepage diffusion gas flow equation reasonable pre-draining time
LI Gang QI Qingxin LI Hongyan JI Wenbo
China Coal Research Institute, Beijing 10013, China
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
1325-1330
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）