Need and Measurements of Accurate Thermodynamic Data for CCS

Abstract

For more efficient, robust and inexpensive CCS systems, improvements of the models describing the behavior of fluids involved in CCS are required. Accurate models in turn require experimental data of high quality, which are still lacking for many important properties when impurities are present. SINTEF Energy Research and the Norwegian CCS Research Centre (NCCS) are addressing the lack of phase equilibrium data in CCS by performing accurate measurements of important systems using a purpose-built setup. So far, the binary mixtures of CO2 + N2, CO2 + O2, CO2 + CH4, CO2 + Ar, and CO2 + CO have been investigated. In the present paper, some examples from the measurements on CO2 + Ar and CO2 + CO systems are provided, illustrating that trusting models could lead to serious consequences if they are not supported by independently verified data.

Experimental density and an improved Helmholtz-energy-explicit mixture model for (CO2 + CO)

“…However, two major deficiencies were identified: first, some binary systems present large regions without data; second, there are significant discrepancies between different data sources. Despite some recent improvements in the data situation, including Tsankova et al [21,22] and Løvseth et al [23] on (CO2 + Ar), Petropoulo et al [24] on (CO2 + CH4), and Tsankova et al [25], Westman et al [26] and Souza et al [27] on (CO2 + CO), these deficiencies remain.…”