In this work, the e-PPC-SAFT equation of state has been parameterized to predict phase equilibrium of the system H₂ + CH₄ + H₂O + Na⁺Cl⁻ in conditions of temperature, pressure and salinities of interest for gas storage in salt caverns. The ions parameters have been adjusted to match salted water properties such as mean ionic coefficient activities, vapor pressures and molar densities. Furthermore, binary interaction parameters between hydrogen, methane, water, Na⁺ and Cl⁻ have been adjusted to match gas solubility data through Henry constant data. The validity ranges of this model are 0–200 °C for temperatures, 0–300 bar for pressures, and 0 to 8 mol_NaCl/kg_H2O for salinities. The e-PPC-SAFT equation of state has then been used to model gas storage in salt caverns. The performance of a storage of pure methane, pure hydrogen and a mixture methane + hydrogen have been compared. The simulations of the storage cycles show that integrating up to 20% of hydrogen in caverns does not have a major influence on temperature, pressure and water content compared to pure methane storage. They also allowed to estimate the thermodynamic properties of the system during the storage operations, like the water content in the gaseous phase. The developed model constitutes thus an interesting tool to help size surface installations and to operate caverns.

在这项工作中，状态的E-PPC-SAFT方程已经被参数化以预测系统H的相平衡₂  + CH ₄  + H ₂ O +的Na ⁺氯^-在用于气体储存的温度，压力条件和感兴趣盐度在盐洞里。调整了离子参数以匹配咸水特性，例如平均离子系数活性，蒸气压和摩尔密度。此外，氢气，甲烷，水之间二元相互作用参数，钠⁺和Cl ^-已被调整，以匹配通过亨利常数数据气体溶解度数据。该模型的有效范围是温度范围为0–200°C，压力范围为0–300 bar和0至8 mol_NaCl / kg _H2O用于盐度。然后，将e-PPC-SAFT状态方程式用于对盐洞中的气体存储进行建模。比较了纯甲烷，纯氢气和甲烷+氢气混合物的储存性能。储存循环的模拟表明，与纯甲烷储存相比，在洞穴中整合多达20％的氢不会对温度，压力和水含量产生重大影响。他们还可以估算存储过程中系统的热力学性质，例如气相中的水含量。因此，开发的模型构成了一个有趣的工具，可以帮助确定地面设施的大小和操作洞穴。