抄録
Ocean storage of carbon dioxide (CO_2) is one of greenhouse gas control technologies. The authors have proposed a CO_2 sending method for ocean storage using a mixture of liquid CO_2 and dry ice, CO_2 slurry. Releasing experiments of CO_2 slurry using a high-pressure tank was carried out to observe the behavior of CO_2 slurry released in highly pressurized water. CO_2 slurry was prepared by melting of dry ice in a chamber at the triple point of CO_2, -56 degrees of Celsius. Descending of CO_2 slurry drops in water was observed. However, releasing of cold CO_2 slurry caused the formation of tubular ice at the releasing nozzle, which narrowed the flow of CO_2 slurry to form slurry drops with a diameter smaller than the nozzle hole. The result implies that the formation of tubular ice at the nozzle should be reduced to control the size of slurry drops.
