Measurement of phase equilibrium and calculation of dissociation heat of mine gas hydrate
WU Qiang
WANG Shihai
ZHANG Baoyong
GAO Xia
LIU Chuanhai
ZHU Wang
Abstract：In order to investigate the phase equilibrium and dissociation heat characteristic of gas hydrate,the phase equilibrium conditions of gas hydrate which CH4-N2-O2 gas mixture in pure water system and TBAB(0.2 mol/L) system were studied.The graphics method and phase equilibrium experimental device for gas hydrate were used.The experimental values of the equilibrium pressure of gas hydrate in pure water system were compared with those calculated by Chen-Guo model.The decomposition heat of gas hydrate was calculated based on the Clausius-Clapeyron equation.The results show that the gas hydrate phase equilibrium conditions become more moderate with the increase of CH4 concentration.TBAB can remarkably improve the phase equilibrium conditions of gas hydrate,then make the boundary of hydrate phase-gas phase shift to the area which higher temperatures and lower pressures.The experi mental data of phase equilibrium pressure were lower than the calculation data by Chen-Guo model for the two kinds of gas mixture at the same temperature in pure water system,the relative errors were 0.18 and 0.23.The decomposition heat of gas hydrate increaseing with the rise of CH4 concentration,the decomposition heat of gas hydrate in TBAB system was much larger than in pure water system.
Keywords：mine gasgas hydratephase equilibriumdissociation heatTBAB
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 748-754 )