Journal of Coal Science and Engineering (China)
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Tracer gas measurement and simulation of turbulent diffusion in mine ventilation airways
Journal of Coal Science and Engineering (China) - Tập 14 - Trang 523-529 - 2008
The effective diffusion coefficients in mine ventilation-flows had been obtained as 4 to 200 m2/s by matching the measured concentration-time curves with the advection-diffusion equation. The turbulent diffusion coefficients in the simple airways have good agreement with the equation proposed by Taylor. However, for complex airways in operating mines, the evaluated effective diffusion coefficients......
Control core of safety management: the reasonable distribution of safety resources
Journal of Coal Science and Engineering (China) - Tập 15 - Trang 328-331 - 2009
The distribution of resources is the basis of safety management. Based on the systematic analysis of a resource distribution system affecting the level of safety, the best distribution proportion between safety activities and production and best resources distribution proportion among the various links of security activities are presented. Moreover, it is stated that the distribution of resources ......
Study on the formation mechanism of shock wave in process of coal and gas outburst
Journal of Coal Science and Engineering (China) - Tập 15 - Trang 134-137 - 2009
According to the research results of motion parameters of coal-gas flow, analyzed the formation mechanism of shock waves at different states of coal-gas flow in the process of coal and gas outburst, and briefly described the two possible cases of outburst shock wave formation and their formation conditions in the process of coal and gas outburst, and then pointed out that a high degree of under-ex......
Explanation for peat-forming environments of coal seam 2 and 9−2 based on the maceral composition and aromatic compounds in the Xingtai coalfield, China
Journal of Coal Science and Engineering (China) - Tập 15 - Trang 16-23 - 2009
Maceral composition and aromatic compounds were determined on column samples to study the peat-forming environments of Permian coal seam 2 and Carboniferous coal seam 9−2 from the Xingtai coalfield, China. The macerals were dominated by inertinite in seam 2 and by vitrinite in seam 9−2. Three maceral groups were selected as indicators of peat-forming environments. Two triangle diagrams were drawn ......
Stress sensitivity of coal samples in terms of anisotropy
Journal of Coal Science and Engineering (China) - Tập 19 - Trang 203-209 - 2013
The permeability and porosity of coal seams are anisotropic, and the variation of confining stress may induce deformation in coal samples. In order to study these characteristics, experiments and model analyses were conducted to understand the behaviors of anisotropic stress sensitivity of lean coal samples. The results showed as the closure of cleats and the generation of micro-cracks, the strong......
Determination of protection range of mining upper protective layers and its numerical simulation
Journal of Coal Science and Engineering (China) - Tập 18 Số 4 - Trang 368-373 - 2012
Rock engineering property of the high-steep open-pit slope and its stability
Journal of Coal Science and Engineering (China) - Tập 16 - Trang 35-40 - 2010
According to the rock engineering property and stability of high-steep open-pit slopes, various factors were collected on the basis of rock engineering system (RSE) theory, and the interaction matrix of stability evaluation was established. Then, the stability evaluation index (S
p) of the slope was put forward. Ranges of the S
p value and the corres......
Research on steel-fibber polymer concrete machine tool structure
Journal of Coal Science and Engineering (China) - Tập 14 - Trang 689-692 - 2008
Researched on the design and manufacturing of machine tool bed made by Steel-fibber Polymer Concrete(SFPC), which analyzed the static, dynamic and thermal performances of the bed. The results of study prove that machine tool bed made with SFPC is much more superiority than made in cast iron in dynamic and thermal performances, and is more superiority then made in Polymer Concrete (PC) in static pe......
A contrast study on different gasifying agents of underground coal gasification at Huating Coal Mine
Journal of Coal Science and Engineering (China) - Tập 17 - Trang 181-186 - 2011
To optimize the technological parameter of underground coal gasification (UCG), the experimental results of air gasification, air-steam gasification, oxygen-enrichment steam gasification, pure oxygen steam gasification and two-stage gasification were studied contrastively based on field trial at the Huating UCG project. The results indicate that the average low heat value of gas from air experimen......
Experimental studies on resistance characteristics of high concentration red mud in pipeline transport
Journal of Coal Science and Engineering (China) - Tập 14 - Trang 157-161 - 2008
Red mud will flow in paste form under high pressure during pipeline transport. It belongs to a two-phase flow of materials with high viscosity and a high concentration of non-sedimentation, homogeneous solid-liquids. In pipeline transport, its resistance characteristics will be influenced by such factors as grain size, velocity, concentration, density, grain composition and pipe diameter etc.. Wit......
Tổng số: 399
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