Vasilenko T. Sorption phenomena in the coal-methane system under various thermobaric conditions

Object: cleat-porosity system of gas-saturated fossil coal. The aim: development of physical bases of the system "fossil coal-gas" behavior under the temperature and outer pressure changes for creation of reliable ways of gas content (methane content) and of parameters of methane release from coal estimation. Methods: sorption and gravimetric methods, high hydrostatic pressures, high unequalcomponent pressures, X-ray analysis, small angle X-ray scattering, differential thermal analysis, optical investigations, NMR-spectroscopy (spin-echo and autodyne method), atomic-force microscopy, mathematical methods of surface image analysis, thermodynamic, statistic and mathematical methods for solution of problems of mass transfer. Results: the base model of sorption phenomena in cleat-porosity system "fossil coal-methane" is developed. It differs by the accounting of main characteristics of this system: close and open porosity of coal substance, solubility, diffusion and filtration coefficients of methane. It is shown that the mass transfer of methane in coal is determined by the joint flow processes of methane diffusion in coal blocs and by the filtration of methane through the system of open pores, channels and cracks of coal. Field of application: physics of solid state, physics of mass transfer, physics of mining industry.