Study on Hydrate Phase Equilibrium Diagram of Methane Containing System Based on Thermodynamic Model

Natural gas hydrate is a potential energy source in the future, which widely occurs nature and industrial activities, its formation decomposition are identified by phase equilibrium. The calculation of multicomponent equilibrium more complex than that single component gas, depends on accurate model characterized enthalpy free energy. Based Kvamme-Tanaka statistical thermodynamic model, theoretical experimental methods were used to predict verify pure methane carbon dioxide temperature range 273.17–289.05 K. curves methane-containing gases such as CH 4 +CO 2 ,CH +C H 6 +H S under different mole fractions drawn analyzed, or calculated. results show that, containing systems mainly related guest molecule type composition gas. evolution law pressure varies with temperature, splitting CO at quadruple point affects conditions. Due consideration interaction between motion molecules vibration crystal lattice, exhibits good performance, quantified terms mean square error (MSE) respect data. magnitudes MSE percent respectively 1.2, 4.8, 15.12 9.20 MPa for , systems, values low 3.57 1.32 dioxide, respectively. This study provides engineers researchers who want consult diagrams any time some new data, calculated curves. research great significance development utilization flow safety prediction gathering transportation.