National Engineering Research Center for Coal Gas Control

Huainan, China

National Engineering Research Center for Coal Gas Control

Huainan, China
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Yuan L.,China University of Mining and Technology | Yuan L.,China Coal Research Institute | Yuan L.,State Key laboratory of Deep Coal Mining and Environment Protection | Yuan L.,National Engineering Research Center for Coal Gas Control
Meitan Xuebao/Journal of the China Coal Society | Year: 2017

As the Internet plus era and intelligence development are intensified in the new century, this research investigates how coal mining copes with the advent of a new round of science and technology innovation by summarizing the history of coal mining and the technological development trends therein. A scientific concept of precise coal mining is proposed to meet the challenges and opportunities facing coal mining in China. By means of technologies including intellisense, intelligent control, the Internet of Things, cloud computing and big data, precise coal mining is proposed as a new future mining mode integrating intelligent mining technique with few workers(unmanned), and disaster prevention and control. This mode is based on transparent spaces and geophysics, as well as multi-field coupling to achieve spatial-temporal accuracy and efficiency. It is able to comprehensively consider factors relating mining under different geological conditions, including mining influences, relevant factors inducing disasters, and ecological destruction caused by exploitation: it is able to enhance the automatisation, intelligentisation, and informatization levels of safe coal production which promotes the transformation of the coal industry from a labor-intensive, to a technology-intensive sector. The research proposes seven key scientific problems and eight major research directions for coal mining and therefore directs the technology route for future science-based mining with few people (unmanned) in the Internet plus era. © 2017, Editorial Office of Journal of China Coal Society. All right reserved.


Yuan L.,China Coal Research Institute | Yuan L.,National Engineering Research Center for Coal Gas Control | Yuan L.,State Key Laboratory of Deep Coal Mining & Environment Protection
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

China is one of the countries which are mostly affected by gas disasters. The coal exploitation rapidly transfers to deep part at the speed of 10-25 m a year for China's coal resources endowment and long-term demand. Deep coal mining faces more serious gas problem. From the safety, energy, environmental considerations, the research on deep coal mining has been strengthened. This paper analyzes the current situations and problems of simultaneous exploitation of coal and gas in China. The direction of simultaneous exploitation of coal and gas is pointed out. China's coal bed methane (CBM) development should stick to the ground and underground combined mode of “walking on two legs”, and improve the overall level of deep coal seam simultaneous exploitation of coal and gas technologies from the basic theory research, key technology and equipment development, demonstration project construction, policy support, etc. © 2016, China Coal Society. All right reserved.


Liu H.,Anhui University of Science and Technology | Sang S.,China University of Mining and Technology | Wang G.G.X.,University of Queensland | Li M.,Shanxi Coalbed Methane Branch of Huabei Oilfield Company | And 7 more authors.
Journal of Petroleum Science and Engineering | Year: 2014

This study performs a block scale investigation on gas content of a coal reservoir in Zhengzhuang Block of the southern Qinshui basin in China. The gas content of Coal Seam No. 3 in this coal reservoir was measured in field and laboratory in conjunction with tests on coal properties such as adsorption isotherm, maximum vitrinite reflectance, coal composition and maceral component etc. Total 36 coal cores collected from 3 adjacent coalmines in the southern Qinshui basin were investigated, including analysis of logging data from the drilling wells. The investigations provided experimental data for block scale modeling and visualization analyses on the correlation between gas content and the key factors such as coal properties and geological conditions of the coal reservoir. Data obtained by field and lab tests were analyzed by statistical models in order to correlate gas content and individual type of coal properties and geological variables. The statistical model was then used to map the gas content of the target coal seam in the studied area, resulting in a flood map of gas content at a 1:50000 scale. The flood map was further visualized with other variables in terms of the properties of coal and coal reservoir and its geological conditions. These visualized maps provide useful geological interpretation for block scale investigation of the comprehensive relationships between the gas content and the coal properties and regional structure in the given coal reservoir. The results show that gas content has little correlation with coal rank, maceral composition, coal thickness, cap and bottom lithology, while it is highly related to the structural properties such as burial depth and effective cover thickness. A stagnant hydrodynamic condition is favorable to the higher gas content on the whole but does not contribute to gas lateral and local variation. Canonical correlation and principal component analysis on the statistical model reveal the key factors that control the gas content are burial depth, effective thickness of overlying strata, groundwater level and moisture content in coal seam. © 2013 Elsevier B.V.


Luo Y.,State Key Laboratory of Deep Coal Mining and Environment Protection | Luo Y.,National Engineering Research Center for Coal Gas Control | Luo Y.,Huainan Mining Group Co.
Journal of Coal Science and Engineering | Year: 2012

Aiming to effectively solve the problem of deep mining with safety and high efficiency, according to geological conditions, production and stress analysis in roadway surrounding rock, experimental studies on roadway supporting of workface 103 under three types of roof conditions with different supporting technologies and parameters were carried out based on the theory of supporting technology of gob-side entry. The results show the supporting of gob-side entry retaining is successful, and the deep surrounding rock is effectively controlled by field monitoring and drilling-hole photos. After stress in surrounding rock of roadways restores stable, the final roadway deformation of surrounding rock of haulage roadway and air-roadway are both about 300 mm; width of gob-side entry is 3.8-4.0 m and average height is 2.0-2.2 m; roadway section is above 8.0 m2, which solves the problems of gob-side entry retaining support strength and safe mining; necessary conditions of mining safety in workface 103 are met. © The Editorial Office of Journal of Coal Science and Engineering (China) and Springer-Verlag Berlin Heidelberg 2012.


Zhang N.,China University of Mining and Technology | Yuan L.,National Engineering Research Center for Coal Gas Control | Han C.,China University of Mining and Technology | Xue J.,National Engineering Research Center for Coal Gas Control | Kan J.,China University of Mining and Technology
Safety Science | Year: 2012

We analyzed the stability of the retained gob-side entry in four different Chinese coal mining sites and evaluated the influencing factors of roadway deformation such as mining depth, support strength and area of gob-side hanging roof. It was found that the length of cantilever roof block above roadway has a major impact on the deformation, whereas the impact of mining depth is minor if the depth is less than 500 m. Minimum support resistance of 0.3. MPa is essential to effectively confine the deformation of a retained roadway. We performed physical experiments to further study the features of roof fracturing and their impact on roadway deformation under three typical immediate roof conditions, i.e., thick-immediate roof, thin-immediate roof and non-immediate roof. In addition, equations to calculate desired support resistance of filled gob-side wall were derived based on superimposed continuous laminate model. The results provide valuable theoretical and practical guidance for implementing pillarless gob-side entry retaining in engineering practices. © 2011 Elsevier Ltd.


Zhai C.,State Key Laboratory of Coal Resources and Safe Mining | Zhai C.,China University of Mining and Technology | Zhai C.,National Engineering Research Center for Coal Gas Control | Li X.-Z.,State Key Laboratory of Coal Resources and Safe Mining | And 5 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

In order to improve the gas drainage efficiency of high gas and low permeability coal seams, the pulse hydraulic fracturing technology was proposed, hydraulic fracturing experiments and mechanical analysis were taken under different pressures and frequencies, and fatigue damage characteristics of coal and the mechanism of high pressure pulse hydraulic fracturing were analyzed too. The results show that alternating stress is formed at the end of coal fracture under the action of the intense pulse water, and fatigue damage failure can be formed in the coal due to repeated action of compression-expansion-compression. The extension of fracture and weak plane in the coal is transformed into interlaced transfixion fracture network. Compared with general methods of hydraulic fracturing, the results of industrial experiments show that pulse hydraulic fracturing generates a better effect of pressure relieving and permeability improving, meanwhile, the concentration and flow of drilling gas extraction are remarkably improved.


Luo Y.,National Engineering Research Center for Coal Gas Control | Qi Q.,Huainan Union University
Journal of Coal Science and Engineering | Year: 2011

The origins and main control methods of gas in coal seams were introduced cursorily, and the processes that need to be done in controlling gas, which includes prediction of gas emissions, drainage systems, the means of prevention of gas outbursts, and some suggestions were put forward. The characteristic of different gas emissions and the corresponding counter measures were presented, and a case study of simultaneous extraction of coal and gas in Xieyi Coal Mine was carried out by coal mining and gas extraction without coal-pillar. The field application shows that gas drainage ratio in panel 5121(0) averages about 90% and reaches as high as 95%, which will give beneficial references to gas control in coal mines. © 2011 The Editorial Office of Journal of Coal Science and Engineering (China) and Springer-Verlag Berlin Heidelberg.

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