An Experimental Study of CO2 Pipeline Transport: the Effect of Nitrogen and Application Scenario in Republic of Korea

Abstract

Carbon dioxide capture and storage (CCS) technology is regarded as one of the most promising emission reduction options for the mitigation of climate change and global warming. Although the technologies for capture and storage of CO2 have been globally investigated and verified, the development of transport infrastructure is still in the initial stage except some typical cases. Especially, the effect of impurities on transport and injection is not clearly resolved yet. Up to now, process design researches for CO2 transport and storage have been carried out mainly on pure CO2 cases. Unfortunately the real captured CO2 mixture contains many impurities such as N2, O2, Ar, H2O, SOx, H2S. Someimpurities can change the thermodynamic properties and then significantly affect the compression, purification, transport and injection processes. Among them, N2 can affect the CO2 transport process by its low boiling point. In other words, a small amount of nitrogen can make change flow conditions from single phase flow to two-phase flow. In this study, we compared and analyzed the relevant equations of state for CO2-N2 mixture. To quantitatively evaluate the predictive accuracy of the equation of the state, we compared numerical calculation results with reference experimental data. In addition, optimum binary parameters to consider the interaction of CO2 and N2 molecules were suggested based on the mea