Molecular Simulation on Adsorption Difference of Water and Methane on Long-Flame Coal

Abstract

The adsorption difference of water and methane by long-flame coal is compared and analyzed by molecular simulation. The results show that when the single-component isothermal adsorption pressure is less than 15 MPa, the adsorption capacity of CH4 and H2O increases gradually with the increase of the adsorption pressure, and the average adsorption amount of H2O is much higher than that of CH4; after more than 15 MPa, the average adsorption amount of CH4 and H2O is saturated. When the two-component isothermal adsorption pressure is less than 0.7595 MPa, the long-flame coal molecule can adsorb both CH4 and H2O; after more than 0.7595 MPa, the average adsorption amount of H2O is much larger than that of CH4 indicating that H2O is in a dominant position in the competitive adsorption with CH4.