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Table of Content
05 April 2011, Volume 62 Issue 4
    Stability condition of CO2 hydrate in silts
    YAN Rongtao, WEI Houzhen, WU Erlin, LU Xiaobing, WEI Changfu
    2011, 62(4):  889-894. 
    Abstract ( 964 )   PDF (1027KB) ( 368 )  
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    Evaluation of stability condition is an important issue in the study of gas hydrate.In this study, the stability conditions for the bulk CO2 hydrate and the CO2 hydrate in silts with dry densities 1.40 g·cm-3, 1.50 g·cm-3 and 1.65 g·cm-3, respectively, are measured and compared.It is shown that the pore effect of silts affects the stability of CO2 hydrate.Compared with the bulk hydrate, the hydrate in the silts has higher equilibrium pressure and lower equilibrium temperature.In addition, the initial dissociation temperature of pore hydrate may affect the stability of hydrate in the silts.Based on the modified van der Waals-Platteeuw model, the stability conditions of gas hydrate in the silt with density 1.65 g·cm-3 are analyzed.It is found that the effect of capillarity on the stability varies.As the hydrate in the silt dissociates, the capillary effect diminishes.