| 초록 |
Naturally occurring CH4 hydrates have promising potential as a possible new clean energy source and appropriate materials for sequestering CO2. Research has been recently conducted on the injection of flue gas, which consists mainly of CO2 and N2 into these natural gas reservoirs. Using this method, CO2 is able to be stored without separating stage, and a new energy source is more effectively exploited. For this method, thermodynamic properties of CH4-flue gas swapping are critical factors for the application of the swapping process. This study is mainly focused on measuring dissociation enthalpy of mixture of CO2 and N2 hydrates, and CH4 hydrates swapped by mixture of CO2 and N2 using differential scanning calorimetry (DSC). In order to decide on the proper experimental conditions, three-phase (H-Lw-V) equilibrium points of gas hydrates are measured at various compositions. Each gas hydrate related to this process is also analyzed via NMR spectroscopy, Raman spectroscopy and X-ray diffractometry (XRD) to determine the effect of swapping on the hydrate structure. From this study, the feasibility of CH4-flue gas swapping is revealed in terms of thermodynamic analysis. |
