MC simulation research on adsorption and desorption of methane in coal seam

At present, the study of methane adsorption and desorption inside coal only stay in the level of its mechanism and invertible experiment. Study about methane molecules' adsorption and desorption characteristic in coal pores in microcosmic level is few. In this study, relationship of macrofluid parameters and micromolecules physical quantity which represent methane adsorption and desorption characteristic was established applying thermodynamics, statistical mechanics and coal chemistry theories. Random movement of methane molecules in coal pores was simulated adopting Monte Carlo molecular simulation technology. Action of methane molecules in adsorption and desorption process was studied. Research methods of this paper have some unique characteristics. Firstly, it is an innovative method that theory of methane molecules random movement in the microcosmic was combined with thermodynamics, statistical mechanics theories to study methane adsorption and desorption characteristic. Secondly, model of methane molecules' adsorption and desorption process was established. Computer simulation and laboratory experiment were both used to inspect and verify each other. Thirdly, simulation program was developed adopting VC++6.0 development environment. Fourthly, relationship graph can be drawn between different parameters including porosity, pressure, temperature etc. and methane adsorption quantity adopting computer graphics visualization technology.