Development and application of an efficient gas extraction model for low-rank high-gas coal beds  

作　　者：Baiquan Lin 

机构地区：[1]The State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology, Xuzhou 221008, China [2]Faculty of Safety Engineering, China University of Mining and Technology, Xuzhou 221008, China [3]Shaanxi Binchang Mining Group Co., Ltd.,Xianyang 721000, China

出　　处：《International Journal of Coal Science & Technology》2015年第1期76-83,共8页国际煤炭科学技术学报（英文）

基　　金：Acknowledgments The research was supported by the National Basic Research Programme of China （973 Project） （2011CB201205）, National Natural Science Foundation of China （51474211）, and the National Key Technology R＆D Program （2012BAK04B07）.

摘　　要：To promote gas extraction in low-rank high-gas coal beds, the pore structure characteristics of the coal and their effect on gas desorption were studied. The results show that micropores are relatively rare in low-rank coal; mesopores are usually semi-open and inkpot-shaped whereas macropores are usually slit-shaped. Gas desorption is relatively easy at high- pressure stages, whereas it is difficult at low-pressure stages because of the ＇bottleneck effect＇ of the semi-open inkpot-shaped mesopores. A ＇two-three-two＇ gas extraction model was established following experimental analysis and engineering practice applied in the Binchang mining area. In this model, gas extraction is divided into three periods： a planning period, a transitional period and a production period. In each period, surface extraction and underground extraction are performed simultaneously, and pressure-relief extraction and conventional extraction are coupled to each other. After applying this model, the gas extraction rate rose to 78.8 %.

关 键 词：Low-rank coal Pore structure Gas extraction Inkpot-shaped pore 

分 类 号：TD712.6[矿业工程—矿井通风与安全] P618.11[天文地球—矿床学]