Study on Technical Method for Sending CO2 into Deep Ocean with Pipe from Floating Platform

概要

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Concerning with the disposal of CO2 in ocean, technical aspects on sending CO2 into deep ocean with a long vertical pipe from a floating platform are treated in this paper.At first, the heat balance of liquid CO2, pipe, ice on the wall and the surrounding seawater is formulated under the equilibrium condition. In order to estimate the vertical temperature change of CO2 correctly, it is found that the heat insulating effects of the ice covered on the pipe wall should be taken into accout. The validity of the estimation method is confirmed with a laboratory test. A stainless pipe is fixed in a seawater-circulating tank and cold N2 gas is let flow in the pipe constantly. The temperature change of the N2 gas and the thickness of ice generated on the pipe wall are measured to be compared with calculated results.Secondly, case studies are performed on liquid CO2 recovered from a 1.0 GW-class coal burning power station. Here, the equipments and piping diagram are initially designed under the necessary condition that the temperature and the pressure of CO2 at the lower outlet are almost the same with those of surrounding seawater.
社団法人日本船舶海洋工学会の論文