In the present study, we propose a new concept to capture carbon dioxide (CO2) from gas industries using a supersonic separator. We develop and validate a computational fluid dynamics model to evaluate the effect of a real gas model on the non-equilibrium condensation CO2 in high-pressure supersonic flows. The results show that the ideal gas equation of state underpredicts the CO2 condensation with the predicted liquid fraction of approximately 15% of the total mass. The Redlich-Kwong equation of state incorporating with the condensing flow model shifts the onset of the CO2 nucleation process upwards to the nozzle throat, while predicting a liquid fraction up to 28% of the total mass. The study indicates that the CO2 condensation in supersonic flows provides an efficient way to mitigate the CO2 emissions from gas industries.
Keywords carbon capture and storage, carbon dioxide separation, non-equilibrium condensation, real gas