Experimental and Numerical Simulation of Water Adsorption and Diffusion in Coals with Inorganic Minerals

The study on the adsorption and micropore filling of water vapor in coal is significant for predicting coalbed methane content seams. primary purpose this to explain effects pore structure its surface chemistry monolayer adsorption, filling, diffusion coefficient. First, X-ray diffraction (XRD) mercury intrusion porosimetry (MIP) analyzed inorganic mineral components two kinds samples fissures structures. Then, we divide pores according theory fractal dimensions. Furthermore, carried out desorption experiments coal; particular, set 14 points relative pressure between 0 0.2. Guggenheim–Anderson–de Boer (GAB), Frenkel–Halsey–Hill (FHH), Freundlich models were used analyze data obtain boundary monolayer, multilayer capillary condensation. Finally, parameters obtained by fitting combined GAB, Freundlich, DA, bidisperse (BDA) interaction mechanism water. We why strongly adsorbed minerals, such as pyrite, illite, nacrite coal, can improve vapor’s capacity fissures.