Thermodynamic Modeling of Methane Hydrate Dissociation Temperature in Porous Media

In this work, an alternative method for prediction of methane hydrate dissociation conditions in the porous media is studied. At a specified temperature, three phase L-H-V equilibrium curves of pore hydrates were shifted to the higher pressure region depending on pore sizes when compared with those of bulk hydrates. The activity of water in porous media was expressed with a correction term to account for capillary effect. Hydrate dissociation temperature in bulk water is calculated using van der Waals-Plaateuw (vdW-P) solid solution theory. After all, methane hydrate dissociation temperature in the porous media is calculated using a model first proposed by Pieroen for H/nR. It was found out that in the porous media, operating pressure of hydrate phase boundary increases with decreasing pore radius. A general equation is suggested to estimate H/nR for methane hydrate dissociation conditions in a porous media as a function of pore radius. Experimental data were achieved from the literature. Comparison with experimental data reported in the literature indicates that the new model is fitted properly with the AAD of 0.2 K.

کلیدواژه ها:

Methane Hydrate ، Porous Media ، Dissociation ، Thermodynamic Modeling