メタンハイドレート中のメタンとCO2の置換速度
2000 年 79 巻 10 号 p. 1011-1019
詳細
2000 年 79 巻 10 号 p. 1011-1019
Injection of liquid CO2 in hydrate layers of natural gas is a promising tech-nique to recover CH4 simultaneously segregating CO2 from the biosphere. This work exam-ined the rate of the conversion of CH4-hydrate immersed in liquid CO2 to CO2-hydrate in a tem-perature range of 274-281K and the pressure range of 4-10MPa for 800-1600h.
The conversion was on going even at the end of every experiment. Mass-transfer in hydrate solid is presumed to dominate the conversion rate. The solute mobility of methane and CO2 in hydrate solid was determined for feasibility studies of this technique in the future. The solute mobility raised as the temperature increased, it decreased as the total pressure increased.
Significantly high conversion rate was observed when the total pressure was set below the dissociation pressure of CH4-hydrate and above the hydrate forming pressure of CO2.
