이산화탄소 포집 및 저장 실용화를 위한 대한민국에서의 이산화탄소 수송

Abstract

Offshore subsurface storage of CO2 is regarded as one of the most promising options to response severe climate change. Marine geological storage of CO2 is to capture CO2 from major point sources, to transport to the storage sites and to store CO2 into the offshore subsurface geological structure such as the depleted gas reservoir and deep sea saline aquifer. Since 2005, we have developed relevant technologies for marine geological storage of CO2. Those technologies include possible storage site surveys and basic designs for CO2 transport and storage processes. To design a reliable CO2 marine geological storage system, we devised a hypothetical scenario and used a numerical simulation tool to study its detailed processes. The process of transport CO2 from the onshore capture sites to the offshore storage sites can be simulated with a thermodynamic equation of state. Before going to main calculation of process design, we compared and analyzed the relevant equation of states. To evaluate the predictive accuracies of the examined equation of states, we compare the results of numerical calculations with experimental reference data. Up to now, process design for this CO2 marine geological storage has been carried out mainly on pure CO2. Unfortunately the captured CO2 mixture contains many impurities such as N2, O2, Ar, H2O, SOx, H2S. A small amount of impurities can change the thermodynamic properties and then significantly affect the compression,purification and transport processes. This paper analyzes the major design parameters that are useful for constructing onshore and offshore CO2 transport systems. On the basis of a parametric study of the hypothetical scenario,we suggest relevant variation ranges for the design parameters, particularly the flow rate, diameter, temperature,and pressure.