CO2 탱크내에서의 열유동장 수치해석

Abstract

In CCS project, CO2 is usually transported by pipeline or ship. In the case of ship transport, CO2 is transported in liquified state in pressurized tanks because of 600 times higher density of liquid CO2 than gaseous CO2. Even though the CO2 tank is efficiently insulated, the heat transfer from the ambient to CO2 tank is inevitable. This heat transfer could cause the significant increase of pressure in the tank and therefore the understanding of thermodynamic and fluid mechanical mechanism of CO2 in the tank during voyage is essential for the development of safe CO2 ships. We numerically studied the pressure increase and fluid flow in the CO2 tank. The FLUENT ver.16 is used for the simulation, and VOF model and Peng-Robinson Equation are used to predict the two phase flow and density of CO2, respectively. In our simulation results, the main cause of pressure increase in the tank is not a evaporation of CO2 but a thermal expansion of liquid CO2. The stratified liquid zone developed by natural convection induce the ingress heat to be accumulated in the upper part of tank.2 tank is efficiently insulated, the heat transfer from the ambient to CO2 tank is inevitable. This heat transfer could cause the significant increase of pressure in the tank and therefore the understanding of thermodynamic and fluid mechanical mechanism of CO2 in the tank during voyage is essential for the development of safe CO2 ships. We numerically studied the pressure increase and fluid flow in the CO2 tank. The FLUENT ver.16 is used for the simulation, and VOF model and Peng-Robinson Equation are used to predict the two phase flow and density of CO2, respectively. In our simulation results, the main cause of pressure increase in the tank is not a evaporation of CO2 but a thermal expansion of liquid CO2. The stratified liquid zone developed by natural convection induce the ingress heat to be accumulated in the upper part of tank.