Development of Gas Extraction Technology in Coal Mines of China

Based on theoretical researches pratical and applications of gas control for many years,we propose a classification method of gas extraction,which is suitable for evaluation standards and can ensure the gas extraction before,during or after coal seam mining.Then,we make a brief description about basic theories on gas control methods and give the concrete design method and technical parameters.In addition,we explain the method of gas extraction before coal seam mining using examples which follow the working principle of regional gas control measures taken in advance.At last,based on the practice in Qinan coal mine of Huaibei mining industry group,we introduce advanced experiences to achieve safe and highly efficient mining using comprehensive gas extraction methods.