CO2 주입정내에서 CO2 열유동 수치해석에 관한 연구

Abstract

Carbon Capture and Storage technology can reduce the release of large amount of CO2 into the atmosphere to mitigate the global warming and ocean acidification. One of the most important key elements in CCS is determining the adequate pressure and temperature injection conditions. Therefore this study numerically analyzes the heat and fluid flow in injection well to see the effect of injection temperature variation. We use FLUENT ver.15 software to estimate the fluidic behavior of CO2 in injection well. The injection target is the saline aquifer, that is located 2000 m under the shallow continental shelf at offshore. The injection rate of CO2 is fixed to 1 MtCO2/y. The diameter and length of injection well are 13 cm and 2000 m, respectively. In order to consider the heat exchanges between injection well and surrounding rocks, the surrounding rocks with 100 m radius are included in the computation domain. The injection temperatures of CO2 are &#8211 27℃, 4℃, and 40℃. The temperature rises of CO2 at the bottom of well are calculated to be small compared to geological thermal gradient. Among effects of compressibility, potential energy and heat transfer, potential energy effect is most significant in increase of bottom well temperature.re and temperature injection conditions. Therefore this study numerically analyzes the heat and fluid flow in injection well to see the effect of injection temperature variation. We use FLUENT ver.15 software to estimate the fluidic behavior of CO2 in injection well. The injection target is the saline aquifer, that is located 2000 m under the shallow continental shelf at offshore. The injection rate of CO2 is fixed to 1 MtCO2/y. The diameter and length of injection well are 13 cm and 2000 m, respectively. In order to consider the heat exchanges between injection well and surrounding rocks, the surrounding rocks with 100 m radius are included in the computation domain. The injection temperatures of CO2 are &#8211 27℃, 4℃, and 40℃. The temperature rises of CO2 at the bottom of well are calculated to be small compared to geological thermal gradient. Among effects of compressibility, potential energy and heat transfer, potential energy effect is most significant in increase of bottom well temperature.