Vasilkovskiy V. Development of scientific bases of kinetics of mass transfer in fossil coals and determination of his gas content

The thesis is devoted to development of scientific basis of the kinetics of mass transfer in porous sorbing media, the nature of interaction of noble gases and methane with coal substance in order to create a complete physical analog of gas-coal system, which considers new data on gas distribution, volume and the nature of micropores in coals. The quantitative assessment of volume of methane in various phase states (free and adsorbed in open pores and blocks of fossil coal) is performed. It is revealed that no filling with helium of micropores happen. It is shown that the kinetics of penetration of helium, neon, argon and methane in coal substance can be explained within the model where the main mechanism of filling of coal micropores is folmers diffusion. A new method of the analysis of the kinetics of methane desorption from fossil coal is theoretically reasonable. It is shown that of the concluding phase, conditions providing the balance of diffusion and filtration streams are realized. In the conditions of balance of streams, characteristic time of desorption is a linear combination of the characteristic times of straining actions and diffusion. The scale effect for granule size dependence of intensity of methane desorption in the coal samples of identical weight is found: the dependence takes place in small granules (R < 2 mm) and it is absent when the size of granules exceeds the layer thickness in layered structure of coal. The phenomenon is associated with porosity rescaling: the larger piece of coal, the higher density of cracks and pores of big diameter. The way of express diagnostics of coal layer with methane is developed. Rules of determination of gas content of coal layers and methane pressure by a meter of kinetics of a mass transfer are developed for correction of a permissible load on a clearing face on a gas factor and monitoring of effectiveness of against gas emission actions.