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Solubility of Nitrogen and Oxygen Gas in Aqueous NaCl Solutions for Elevated Temperatures and Pressures
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, The Third Sustainable Earth Sciences Conference and Exhibition, Oct 2015, Volume 2015, p.1 - 5
Abstract
Compressed air energy storage (CAES) is considered a possible option for storing energy from renewable production. Using geological porous formations for compressed air energy storage is viable. The solubility of compressed air in the highly mineralized formation water determines the total amount of dissolved gas and the magnitude of possible water-rock interactions. An accurate model for compressed air solubility under different temperature, pressure and salinity conditions is thus required to study the induced effects of compressed air energy storage in porous formations. Based on the principles of thermodynamics, we established the compressed air solubility model and expressed it as a polynomial formula, which consists of Henry’s constant, Poynting Factor, fugacity coefficient and activity coefficient, as well as partial pressure of each component in gas phase. By parameterization, we can directly use the model to work out solubility conveniently under various given conditions. For the model, the appropriate ranges of temperature, pressure and solution concentration are 273–373 K, 0.1–50 MPa, 0–5 mol/l of NaCl concentration. We have established a computer program for the model, which is also coupled with OpenGeoSys for reservoir simulation purposes and can thus be used in future work on CAES induced geochemical effects.