Equation of state and thermodynamic properties for mixtures of H2O,O2, N2, and CO2 from ambient up to 1000 K and 280 MPa
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Author (Corporation)
Publication date
05.03.2019
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Type
01A - Journal article
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Parent work
The Journal of Supercritical Fluids
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Volume
153
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Elsevier
Place of publication / Event location
Amsterdam
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Abstract
Supercritical water oxidation (SCWO) is an effective technique to treat wet organic wastes. Its modeling requires an accurate calculation of thermodynamic properties. In this work an equation of state (EOS) is proposed which accurately predicts the thermodynamic state of mixtures of water, oxygen, nitrogen, and carbon dioxide for a wide range of compositions, temperatures, and pressures including supercritical conditions. The EOS includes a volume translation, an evolved alpha-function and non-quadratic mixing rules. The introduced parameters are regressed to experimental data. From the pressure-explicit EOS, enthalpy, specific heats at constant volume and constant pressure, and fugacity coefficients are derived and calculated. The binary mixtures H2O/O2, H2O/N2, H2O/CO2, N2/CO2 as well as the ternary mixture H2O/O2/N2 are well predicted by the proposed EOS with relative errors below 10% and 15%, respectively. The region of low temperature and high pressure is most difficult to predict with relative errors up to 20%.
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ISBN
ISSN
0896-8446
1872-8162
1872-8162
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Zero Emission
Publication status
Published
Review
Peer review of the complete publication
Open access category
Hybrid
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Citation
Mangold, F., Pilz, S., Bjelic, S., & Vogel, F. (2019). Equation of state and thermodynamic properties for mixtures of H2O,O2, N2, and CO2 from ambient up to 1000 K and 280 MPa. The Journal of Supercritical Fluids, 153. https://doi.org/10.1016/j.supflu.2019.02.016