Thermodynamic Modeling of CO 2 -N 2 -O 2 -Brine-Carbonates in Conditions from Surface to High Temperature and Pressure

Jun Li, Raheel Ahmed and Xiaochun Li
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Jun Li: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
Raheel Ahmed: Dimue Technology Ltd. Co., Wuhan 430000, China
Xiaochun Li: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Energies, 2018, vol. 11, issue 10, 1-18

Abstract: Nitrogen (N 2 ) and oxygen (O 2 ) are important impurities obtained from carbon dioxide (CO 2 ) capture procedures. Thermodynamic modeling of CO 2 -N 2 -O 2 -brine-minerals is important work for understanding the geochemical change of CO 2 geologic storage with impurities. In this work, a thermodynamic model of the CO 2 -N 2 -O 2 -brine-carbonate system is established using the “fugacity-activity” method, i.e., gas fugacity coefficients are calculated using a cubic model and activity coefficients are calculated using the Pitzer model. The model can calculate the properties at an equilibrium state of the CO 2 -N 2 -O 2 -brine-carbonate system in terms of gas solubilities, mineral solubilities, H 2 O solubility in gas-rich phase, species concentrations in each phase, pH and alkalinity. The experimental data of this system can be well reproduced by the presented model, as validated by careful comparisons in conditions from surface to high temperature and pressure. The model established in this work is suitable for CO 2 geologic storage simulation with N 2 or O 2 present as impurities.

Keywords: thermodynamic modeling; CO 2 geologic storage; CO 2 -N 2 -O 2 -brine-carbonates; fugacity; activity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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