Study on the Principle and Technology of Coal and Methane Simultaneous Extraction Based on the Mining Fissure Elliptic Parabolic Zone

Coal and coal-bed methane are all valuable energy resource, if they can be extracted simultaneously and safely, the triple purposes of mine safety production, new energy resource supply and environment protection can be fulfilled. The coal-bed methane existing features of "three high-low" are analyzed in China, it is obtained that the main degasification method is drawing relieved methane. Based on the analysis of formation and dynamic feature of mining fissure Elliptic Parabolic Zone, applying environmental fluid mechanics and the principle of gas transportation, the floating-diffusion process of relieved methane in mining fissure zone is explained, and the layout principle of relieved degasification system is obtained. The artificial diversion flow method of degasification roadway which fulfills the coal and methane simultaneous extraction is put forward by a coal mine in Yangquan, China. Such studies show that the paper can provide the theoretical base and technical support for safely simultaneous extraction of coal and methane.