Dynamic Process and Control of Gas Hydrate Formation/Dissociation under nonequilibrium conditions

摘要

Experiments on the dynamic process of gas hydrate formation/dissociation and the control method have been performed to obtain fundamental data for the development and utilization of gas hydrates in the future. Phase behaviors of gas hydrates are measured as hysteresis curve of the process of gas hydrate formation and dissociation under nonequilbirimum conditions. Differences in the formation/dissociation temperatures and pressures are clarified between methane and carbon dioxide hydrates. Pure samples of methane gas hydrate are synthesized from ice crystals and the dissociated solution of gas, and are analyzed using DSC and Raman Spectroscopy. The replacement of guest molecules can be achieved within a short period in the synthesized gas hydrate, if the pressure and temperature is precisely controlled in a pressure vessel. As for the engineering data necessary for the development of gas hydrates, the dissociation rate of gas hydrate is measured, changing the temperature condition.