2333 海洋中層溶解法における CO_2 希釈の評価

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  • Dilution of CO_2 at intermediate depth of ocean

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CO_2 sequestration in ocean, i.e. transportation of liquefied CO_2 removed from flue gas at fossil-fuel-fired power plants through a pipe into the ocean, is considered to be an effective mitigation strategy for global warning due to the increase of CO_2 in the atmosphere. One of the methods considered for implementation is dissolution of CO_2 at intermediate ocean depth using moving ship, where released liquid CO_2 droplets dissolve in the process of rising upward due to buoyancy in the sea water. CO_2 dissolved sea water would be diluted due to the seawater entrainment induced by the turbulent wake of towed pipe for releasing CO_2. Key point of the strategy is how long would it take for CO_2 concentration to be negligibly small. We describe here numerical studies on the evaluation of the dilution of CO_2 at the wake region of moving towed pipe. A numerical simulation employing four equations turbulence model was conducted to elucidate the pH variations in terms of both time and space. CO_2 dilution is fast enough compared to the data of biological impact.

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