Hydrogen and air storage in salt caverns: a thermodynamic model for phase equilibrium calculations

When storing gas in a salt cavern, it occupies most of the excavated volume, but lower part cavern inevitably contains residual brine, contact with gas. The design hydrogen and compressed air storage caverns requires to have thermodynamic model able accurately predict both phase properties such as densities, equilibrium (gas solubility water content vapour phase). This work proposes parameterization e-PPC-SAFT equation state this context. Experimental data pure components mixtures light + salted are reviewed used fit component parameters for hydrogen, nitrogen, oxygen, binary interaction between H 2 , O N ions (Na Cl − ), temperature ranging from 273 473 K salinities up NaCl saturation (6 mol/kg). developed delivers good accuracy reproducing data: average deviation experiments calculated is 3% 9% saturated brine. More interestingly, has been validated on its capability not included database, including composition vapor phase, extension mixture, air. Finally, case study Compressed Air Energy Storage (CAES) evaluate produced during injection-withdrawing cycles.