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Meng Z.-P.,China University of Mining and Technology | Meng Z.-P.,China Three Gorges University | Wang B.-Y.,China University of Mining and Technology | Wang B.-Y.,Shanxi Jincheng Anthracite Mining Group | And 3 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

By the mechanical tests of the coal samples, the physical and mechanical properties of coal and the law of permeability during the complete stress-strain process were studied. It is shown that, compared with the rocks from coal roof and floor, the coal is more prone to plastic deformation with the property of lower mechanical strength, lower elastic modulus and higher Poisson's ratio. For the coal samples which have obvious strain-softening character during the complete stress-strain process, first, the coal sample volume is compressed and the permeability of coal with stress increases slightly or permeability changes little in the micro-cracks closure and elastic deformation stage. After the stress increases higher than the elastic limit, the coal sample gets into the crack propagation stage. The volume strain of coal changs from compression to expansion. The permeability of coal first slowly and then sharply increases with an increasing of crack extension. During the strain-softening stage, the coal permeability achieves the maximum and follows by a sharp decrease. The coal permeability after the peak strength is generally greater than that before the peak. For coal samples which have little strain-softening character or strain-hardening during the complete stress-strain process, the maximum permeability is mainly achieved in the plastic deformation stage before the peak. During the strain-hardening stage after the peak strength, the permeability decreases with an increasing of stress. Commonly, the coal permeability after the peak strength is generally less than that before the peak.


He T.-C.,Shanxi Jincheng Anthracite Mining Group | Wang B.-Y.,Shanxi Jincheng Anthracite Mining Group | Tian Y.-D.,Shanxi Jincheng Anthracite Mining Group
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

Jincheng mining area is China's largest anthracite coal production area with high gas content. Conventional underground drainage is not sufficient to meet the requirements of mine safety and efficient coal production. Through exploring ground drainage technology, underground drainage technology and ground and underground combined drainage technology, Jincheng Anthracite Mining Group has developed an “Integrated Coal Mining and Gas Extraction” 3D extraction method named “Jincheng Mode”. This mode is used widely in China, and has achieved good results. Based on the actual situation in Jincheng mining area, this paper presents the basic concept and analyzes the current research status of coal and coal-bed methane simultaneous extraction, introduces the mine gas control model of “coal and coal-bed methane simultaneous extraction” and the key technologies of ground drainage and underground gas drainage. Also the future direction and some basic problems needed for further study will be discussed.


Li Q.-F.,Shanxi Institute of Coal CAS Chemistry | Li Q.-F.,Shanxi Coal Gasification Engineering Research Center | Zhao X.-P.,Shanxi Coal Gasification Engineering Research Center | Zhao X.-P.,Shanxi Jincheng Anthracite Mining Group | And 6 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2010

The ash agglomerating fluidized bed (AFB) process researched and developed by the Institute of Coal Chemistry of Chinese Academy Sciences was described, and an introduction to its adaption range and industrial application was given. The AFB coal gasification technology is featured by moderate operation temperature, low oxygen consumption, good adaptability to different coal types, no tar contained in the gas, and low requirement for the refractory material of gasifier, etc. Meanwhile, the running situation of 0.6 MPa industrial gasification plant was presented, the operating results were summarized, and the needs of improvement were proposed.

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