Mass transport phenomena of liquid CO2 with hydrate

Present paper reports dissolution rate of liquid CO2 with hydrate film into water which is essential for estimation of CO2 sequestration in ocean and marine environmental impact assessment. Effect of hydrate film was fully included in the simulations. Droplet diameter released from pipeline introduced from power-plant is required to be less than 0.8 cm to obtain the complete dissolution for the travel distance less than 1000 m. On the other hand, it was demonstrated that easier released droplet size condition to obtain complete dissolution is acceptable when liquid CO2 is released from a pipe of moving ship. For CO2 isolation at seabeds deeper than 3000 m, an experiment simulating dissolution of liquid CO2 stored at a seabed into an undercurrent flow was conducted. Applying the measured surface concentration and mass transfer coefficient obtained from the actual conditions of deep ocean, the time scale of CO2 dissolution into an undercurrent flow was estimated to be around 240 years for a complete dissolution of the CO2 pool created by a 1 GW power plant in 10 years.