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Wu Y.,Datong Coal Mine Group Co.
Procedia Engineering | Year: 2011

In recent years, a series of gas and spontaneous fire prevention technologies are summarized by Tashan coal mine of Datong Coal Mine Group CO.,LTD, which are suitable for extra-thick coal seam mining of carboniferous period through collaborative investigation of industry-university-institute and engineering practice. These technologies provide safety guarantee for the high efficient mining of extra-thick coal seam of permo-carboniferous in Tashan coal mine. © 2011 Published by Elsevier Ltd.

Li W.-T.,Taiyuan University of Technology | Li W.-T.,Datong Coal Mine Group Co. | Guo B.-T.,Taiyuan University of Technology | Zhao J.-Z.,Taiyuan University of Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

As a traditional purification technology (low temperature liquefaction, pressure swing absorption, membrane separation, etc.) is not applicable to low concentration coal bed methane (CBM), a new technology is put forward, which achieves the enrichment of CH4 with low concentration CBM in a hydrates formation way. However, to implement such technology, there are two problems in the process of CBM hydrates formation, such as low hydrates formation rate and low gas storage density, which are required to be solved. The tubular reactor test results in Japan and the research achievements obtained from the current theoretical research and experimental study including the optimum concentration ratio promoted by THF and SDS based on the hydrates formation phase equilibrium condition, gas density and hydrates formation rate and the promotion of porous medium to hydrates formation are used for reference in this study. The change of hydrates formation rate and industrial implementation under the optimum promotion system of molar fraction of 17% THF+mass concentration of 300×10-6SDS theory are investigated by taking the tubular reactor filled with 5×10-10 m zeolite as the CBM hydrates formation interface. The results show that with the increase of the formation pressure, the rate of the whole pipeline reaction rate increases and the peak moves forward along the pipeline; with the increase of the hydrate driving force, the gas storage efficiency of hydrate is improved, and the effect of over-voltage driving force on hydrate gas storage is stronger than that of under-cooling driving force; in the condition of 284 K/1.5 MPa, after primary formation, the second formation is generated by porous medium, when the same gas storage capacity is achieved, ge, the secondary formation time is only 10% of the first formation time; in the condition of 284 K/1.8 MPa, with the increase of the formation time, the gas consumption per formation unit reaches 67.25 mL/mL, and the formation rate and gas density of the hydrates can be improved greatly by using the shortening effect of secondary formationtime. © 2016, China Coal Society. All right reserved.

Deng J.Q.,Tsinghua University | Lin C.,Tsinghua University | Yang Q.,Tsinghua University | Liu Y.R.,Tsinghua University | And 2 more authors.
Computers and Geotechnics | Year: 2016

The initiation and propagation of directional hydraulic fracturing (DHF) was investigated based on true tri-axial experiment and finite element modeling. The influences of notch angle, notch length and injection rate on the DHF were investigated. The initiation and propagation of DHF was modeled by a 3D nonlinear finite element method. A comparison between experimental investigation and numerical modeling results indicates that there is a good correlation between unbalanced force (UF) and fracturing. UF can be used to predict the hydraulic fracture initiation and propagation. © 2016 Elsevier Ltd.

Yu B.,Datong Coal Mine Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

Based on theoretical analysis, numerical simulation and field monitoring, an evolution model of breaking roof group structure of multi-coal seams was established, the development and extension height of breaking roof group were derived when mining successive coal seams, and the formula of mining face support strength was given under the interaction of remained coal pillars and breaking roof group. Subsequently, the extension law of breaking roof group height was studied using numerical simulation and the site validation was also carried out. The results show that: the space between the coal seams of Jurassic system is small and the interval layer is easily broken and connected to the caving and broken roof structure of upper coal seam which leads to the formation of a breaking roof group structure. Though the space between Jurassic and Carboniferous system is large, the weight of breaking roof group of Jurassic system passes down through remained coal pillars and acts on the mining face support together with breaking roof group strata of Carboniferous system, which results in the significant increase of support pressure in mining face of Carboniferous system and strong ground pressure occurs. This paper explains the reason why strong ground pressure appears in lower coal seam when mining multiple coal seams, which could provide the basis for the surrounding rock control in multi-coal seams mining at Datong mining area and similar coal mines. ©, 2015, China Coal Society. All right reserved.

Yu B.,Datong Coal Mine Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2010

Briefly introduced the main achievements of the roof control technology, mining technique and the gas prevention and control as well as the seam spontaneous combustion comprehensive prevention and control technology for the fully mechanized coal mining under the hard roof and hard seam deposit conditions in Datong mining area in the passed 40 years. According to the present status of the coal resources getting less and less, looked ahead on the development orientation of the near several coming years in Datong mining area. Pointed out that the breakthrough should be achieved at the mining technology for the seam thickness below 1.2 m and above 20 m, and the fully mechanized coal mining technology suitable for the coal mine with residual coal resources and the new integrated coal mine in order to ensure the sustainable development of the enterprise.

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