DETERMINATION OF PARAMETERS OF METHANE TRANSPORT IN FOSSIL COAL AT DESORPTION
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2018, Vol 1, Issue 110
Abstract
Purpose. To develop physically sound method of determination of characteristic methane diffusion and filtration times at desorption from the fossil coals. Methodology. Fluid mechanics methods are used for description of mass transfer process combined with the sorptographic experiments for the determination of methane desorption from coal. Experimental data are used, which were obtained from conducted experiments on saturation of various grain-size coal samples with methane in the high-pressure chamber with the further recording of its release to the known volume container. Results. Based on the previously derived analytical expression for the characteristic time of desorption at its final stage, method is developed of separate determination of characteristic filtration and diffusion times. It is found that time of methane release from the D and G grade coals is mainly determined by the diffusion process. This suggests diffusion of gas molecules in the dense coal matter. On the contrary, diffusion in anthracite is relatively fast, and principal time of methane release from coal is determined by time of gas migration through the filtration channels. Originality. Information is obtained about the values of diffusion coefficients being free of additional filtration effects accompanying desorption from coals. It is found that coefficient of diffusion increases with the coal metamorphization degree increase. Coefficient of diffusion in coals with low volatile-matter content and anthracite increases by up to two orders, which may be due to addition of surface diffusion in micropores and transient pores. The scale effect variation is found for desorption in the metamorphic coal series. Practical value consists in the separate determination of diffusion and filtration parameters of methane transport in the fossil coal at desorption, which is used to maintain the comparative characteristics of methane transport parameters in the flat mine bed coal, in the geological faults zone coal and in the gas-dynamic zone coal. The coal desorption characteristics determination will allow improvement of the colliery operation safety estimation methods and assessment of possibility of coal mining as accessory energy producing material.
Authors and Affiliations
V. Vasilkovskiy, О. Chesnokova
Keywords
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- EP ID EP659904
- DOI 10.30929/1995-0519.2018.3.52-59
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