溶解拡散型CO_2海洋隔離における希釈放流技術に関する基礎研究(その1)

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Ocean sequestration of the captured CO_2 from fossil fuel burning is a possible option to mitigate the increase of CO_2 concentration in the atmosphere. It can isolate huge amount of CO_2 from the atmosphere for long time in relatively low cost, if it is acceptable from the viewpoint of the oceanic environmental impact. The dissolution type treated in this paper is based on the idea that CO_2 dissolved and sufficiently diluted in seawater does no more harms than slightly increasing the concentration of CO_2 already contained in the seawater. The concept of CO_2 dispersion in the ocean depths by ship is a promising implementation for the efficient dilution. That is, liquefied CO_2 is delivered by ship to the site and injected into ocean depths of 1,000 to 2,500m with a suspended and towed pipe by a slowly moving ship. The constant movement of releasing point of CO_2 causes no stagnation and accumulation of CO_2 in seawater. The released CO_2 will form plenty of droplets, and then they rise gently due to the buoyancy, while reducing in the size to disappear by dissolution in the ambient seawater. Since the turbulent diffusion in the intermediate ocean is dominant horizontally, use of the vertical journey of CO_2 droplets will be very effective for the initial dilution. Thus, authors have good prospects for the dilution ratio of one to a hundred thousands in a couple of hours after injection on an engineering realistic scale, by means that the initial size of droplets is controlled. Drop formations from a fixed nozzle are investigated referring the common knowledge on textbooks. And the possibility of generating relatively large size of droplets from a moving nozzle is experimentally studied. As a result, it is found that the horizontal nozzle towed by the slowly moving ship is promising for the control of the drop formations in a realistic scale .
社団法人日本船舶海洋工学会の論文

溶解拡散型CO_2海洋隔離における希釈放流技術に関する基礎研究(その1)

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