中文摘要：

实验测定了在不同温度、压力条件下,水合物存在时CO2和CH4在水溶液中的溶解度。将Chen-Guo水合物模型和拓展的P-T状态方程应用到水合物存在条件下CH4和CO2在溶液中的溶解度计算,对于V-Lw-H三相条件下CH4和CO2在液相中的溶解度取得了较高的计算精度。本文将vander Waals-Platteeuw模型和拓展的P-T状态方程结合,建立了用于计算高于三相平衡压力条件下CH4和CO2在液相中溶解度的模型。考察了系统压力对CH4和CO2在液相中溶解度的影响。结果表明,压力增加会显著影响CH4和CO2在其溶液中的溶解度。模型基于两点假设经过改进后具有较高的计算精度,能够用于水合物存在条件下CH4和CO2在液相中溶解度的计算。

英文摘要：

The solubilities of CO2 and CH4 in pure water in the presence of gas hydrate were measured under different conditions.The Chen-Guo hydrate model combining with the extended P-T equation of state was used to calculate the hydrate-liquid phase equilibrium of CO2-H2O and CH4-H2O systems at V-Lw-H equilibrium condition,and reliable predictions were obtained in a wide range of temperature and pressure.A model was proposed to evaluate the effect of pressure on the solubilities of CO2 and CH4 by using the P-T equation of state and the van der Waals and Platteeuw model.The calculated results indicate that from thermodynamic equilibrium the pressure has a significant effect on the solubility values.Based on the two assumptions the model is improved and can be used to calculate the solubilities of CH4 and CO2 in pure water.