Thermodynamic model of CO2 and SO2 injection into deep saline formations

CO2 sequestration in saline aquifers system is modeled as integration between thermodynamic equilibrium between gas phase and an aqueous saline water phase without rock interactions over a range of pressure, temperature and salinity conditions and chemical speciation equilibrium is in aqueous solutions. The gas phase formed of a mixture of Supercritical CO2 and SO2 that are retained from the original flue gases. The equilibrium in this model based on equating the chemical potentials in the system, using Peng-robinson EOS and pressure-salinity adjusted Henry's law constant. Sensitivity analysis was established to allow simulation of the effects of SO2 in subsurface CO2 storage. A key advantage of the present model is that this model uses a fluid property module of mixtures of SO2 and CO2 under saline aquifers conditions for CO2 disposal which is not available in the most recent reactive geochemical transport codes as TOUGHREACT.