メタンハイドレート開発における二酸化炭素ガスを用いた人工天盤構築の基礎的研究 : 模擬堆積層中における二酸化炭素ハイドレートの成長挙動

概要

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The experiments to observe formation and growth of CO2 hydrate in model sediment was conducted and the following results were obtained.(1) The CO2 hydrate started to form under a state of supercooling. The temperature of the sediment in the hydrate-growth region gradually increased and finally reached the nearly thermodynamic equilibrium condition.(2) The measurement of temperature distribution was effective to understand the location and the process of hydrate growth. The speed of hydrate growth in the direction of height was found to be 0.5-1.0cm/min under the experimental condition.(3) A simple kinetic equation predicting the hydrate growth was constructed under the assumption that the driving force of hydrate growth was proportional to the fugacity difference, where the overall rate constant of hydrate growth K for each experiment was estimated from the amount of CO2 consumed. The value of K showed the tendency of increase under the experimental condition having the larger area of gas-water contact.These results can be used as basic data in the future study of CO2 sequestration process into the sediment while gas recovery from natural methane hydrate.
社団法人資源・素材学会の論文
2004-03-25