| 초록 |
The vast natural gas hydrate deposits on the deep seafloor have attracted the attention of many researchers in energy and environmental fields because of recovering a huge amount of CH4 stored in the hydrate-bearing sediments. Separately, CO2 hydrates in deep ocean CO2 storage are also considered. To attain both of these things at the same time, the swapping mechanism, the replacement of CH4 hydrate with the sequestration of flue gas N2+CO2, has investigated into the actual application in recent years. However, the phase equilibrium data of ternary CH4-N2-CO2 mixed hydrate is essential to the swapping mechanism, but not yet available. In the present study, phase equilibrium measurements were carried out for ternary CH4-N2-CO2 mixed hydrate system and the feed gas molar ratio of N2 to CO2 of 8:2 will be fixed according to conventional flue gas type of power plant. This hydrate system cannot form structure II at all composition, because the binary mixed N2-CO2 hydrate was known to form structure I at compositions above 0.2 mole fraction of CO2. Gas chromatography would be introduced to hydrate phase compositions of the ternary mixed hydrates measured at the corresponding vapor phase compositions. |
