이산화탄소 해양지중격리 공정 사례연구

Abstract

A case study on carbon dioxide (CO2) sequestration process into ocean underground was performed in order to investigate technical feasibility of supercritical pipeline transportation concept. The whole process is composed of three plants and three zones from the emission source of CO2 to the sink, i.e. ocean underground such as oil and/or gas reservoir and aquifer layer: Plant 1, Zone 1, Plant 2, Zone 2, Plant 3 and Zone 3(Huh et al., 2008). Plant 1 performs several functions such as dehydration, compression and purification. Zone 1 denotes pipe line transportation on land. Plant 2 is an optional process, which includes liquefaction, temporal storage and compression for ship transportation. Plant 2 is usually located in onshore. Zone 2 denotes pipe line transportation on the seafloor from Plant 2 to Plant 3. Plant 3 denotes ocean platform which has facilities such as compression and cooling. Zone 3 denotes pipe line transportation from Plant 3 to ocean underground in which pressure and temperature are higher than that of supercritical point, 73.9 bar and 31.1 ℃. The steady-state simulation was performed by using Aspentech HYSYS. Finally, It was concluded that the concept of supercritical transportation and storage of CO2 is technically feasible.