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......
Research on numerical emulator of mine methane and coal dust explosion
Journal of Coal Science and Engineering (China) - Tập 14 - Trang 447-452 - 2008
The mathematical physics model of mine methane and coal dust explosion propagation was established in the research, by using continuous phase, combustion, particulate equations of mathematical physics. Based upon the data from mine methane drainage roadway explosion, and mine methane and coal dust explosion propagation experimental studies, the numerical emulator system of mine methane and coal du......
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......
Effects of mushroom waste on improvement of reclaimed soil quality in coal mining areas
Journal of Coal Science and Engineering (China) - Tập 19 - Trang 237-242 - 2013
Restoring soil quality is the main evaluation norm of the reclamation. In order to reveal the effects of mushroom waste on the quality improvement of reclaimed soil in coal mining areas, the physical, chemical and microbial characteristics of soil are studied. The results show clear improvement in the soil after using mushroom waste. Because of human cultivation and fertilization, cultivated soil ......
Reliability and maintainability analysis of electrical system of drum shearers
Journal of Coal Science and Engineering (China) - Tập 17 - Trang 192-197 - 2011
The reliability and maintainability of electrical system of drum shearer at Parvade.1 Coal Mine in central Iran was analyzed. The maintenance and failure data were collected during 19 months of shearer operation. According to trend and serial correlation tests, the data were independent and identically distributed (iid) and therefore the statistical techniques were used for modeling. The data anal......
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......
Experimental study for the particle size distribution of mine spoil pile cross section
Journal of Coal Science and Engineering (China) - Tập 16 - Trang 415-418 - 2010
The aim of the experiment is to analyze and view the distribution of gangue with different particle sizes in mine spoil pile cross section. According to the Dimensional method, ‘Pi’ theorem was employed first to abbreviate ten physical and mechanical parameters to three dimensionless groups, and then the similarity criterion and coefficient of the experiment were determined and calculated based on......
Improving mine safety technology and training in the U.S. recommendations of the Mine Safety Technology and Training Commission
Journal of Coal Science and Engineering (China) - Tập 14 - Trang 425-431 - 2008
The key issues studied focused on underground coal mining and included (1) prevention of explosions in sealed areas, (2) better emergency preparedness and response, (3) improvement of miners’ ability to escape, (4) better protection of miners before and after a fire or explosion, (5) improved provision of oxygen, and (6) development and implementation of more robust post-incident communication. Th......
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