This chapter illustrates that the moving-ship type of CO2 ocean storage is a concept whereby captured and liquefied CO2 is delivered by ship to a site and injected into the ocean depths by means of a pipe suspended beneath it as it slowly moves through the water. In addition to the horizontal movement of the release point, the rising and gradual dissolving behavior of CO2 droplets contributes to the dilution of CO2 in seawater. From the point of view of dilution, deeper injection and faster movement of the release point are preferable, and a technology to make droplets of an appropriate initial size is needed to control the distance of the vertical journey of CO2 droplets. It discusses that the engineering feasibility of a long pipe suspended and towed by a moving ship is first investigated. A streamlined nozzle for making droplets of an appropriate initial size is designed and examined in a towing tank and also in a high-pressure tank. The terminal velocity of a rising CO2 droplet under deep ocean circumstances is measured in a high-pressure tank taking into direct account the influence of a covering hydrate film. Finally, a numerical case study is performed to assess the effects of initial CO2 droplets on the plume dynamics, implementing the observation data taken from the experiments to a two-fluid CO2 plume evolution model.
|Title of host publication||Greenhouse Gas Control Technologies 7|
|Subtitle of host publication||Proceedings of the 7th International Conference on Greenhouse Gas Control Technologies 5– September 2004, Vancouver, Canada|
|Number of pages||9|
|Publication status||Published - 2005|
ASJC Scopus subject areas