二酸化炭素深海貯留のための実海域実験

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An international joint research team "Ocean Abyssal Carbon Experiment (OACE)" was organized by National Maritime Research Institute (NMRI), Monterey Bay Aquarium Research Institute (MBARI), and University of Bergen (UoB) with financial support from the New Energy and Industrial Technology Organization (NEDO) with a view to examining feasibility of CCh ocean storage in 2002. The team has accomplished three-time complex field experiments leaded by Dr. Brewer with supporting laboratory experiments and theoretical analysis leaded by Dr. Aya, Prof. Haugan, and Prof. Johannessen. In early 2003, the team conducted a preliminary experiment of CO_2 release into an inverted box at 684m depth. Then, they manufactured a benthic flume for creating controlled flow conditions, and conducted regular experiments of CO_2 release using the flume at 3942m depth in late 2003 and late 2004. At the depth, they confirmed that the liquid CO_2 in the flume was covered with thick CO_2 hydrate membrane and stably stored after left in a natural weak ocean current for two days. Also, from the experiments using a seawater recirculation loop on dilution process of the seawater with high concentration of CO_2 and HCl, they found out that it took a measure of time for CO_2 liquid or CO_2 hydrate to generate hydrogen ions, and pointed out that electrical conductivity of seawater should be additionally taken into account in order to accurately estimate CO_2 solution rate into seawater nearby the CO_2 source. Prof. Haugan's group at UoB observed and analyzed the fluid dynamics of the liquid CO_2 surface. Dr. Aya's group at NMRI simulated these field results in their 40MPa pressure vessel system. Prof. Johannessen's group at UoB developed a sensitive and high-pressure resistant pH sensor. The results of these field experiments were included in the "IPCC Special Report on Carbon Dioxide Capture and Storage."
独立行政法人海上技術安全研究所の論文
2006-09-19

二酸化炭素深海貯留のための実海域実験

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