Proposal of self sinking CO2 sending system:: COSMOS

A new CO2 sending method, COSMOS, (CO2 Sending Method for Ocean Storage) was proposed, which can send CO2 economically to the dented ocean floor deeper than 3500 meter where liquid CO2 can be stably stored. Because the density of cold CO2 transported by a CO2 career is heavier than sea water even in rather shallow ocean such as 500 meters depth, large CO2 droplets covered with ice layer can sink to the ocean floor crossing the critical depth (2700 m) where the density of thermally equilibrium CO2 balances with sea water. The minimum diameter of initial CO2 droplet, which depends on the initial temperature and the release depth, was calculated considering the buoyancy of ice, the heat transfer between droplet and sea water and the dissolution rate of CO2 hydrate.