Instability Analysis of Supercritical CO 2 during Transportation and Injection in Carbon Capture and Storage Systems

Il Hong Min, Seong-Gil Kang and Cheol Huh
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Il Hong Min: Department of Convergence Study on the Ocean Science and Technology, Ocean Science and Technology School, Korea Maritime and Ocean University, Busan 49112, Korea
Seong-Gil Kang: Korea Research Institute of Ships and Ocean Engineering, Daejeon 34103, Korea
Cheol Huh: Department of Convergence Study on the Ocean Science and Technology, Ocean Science and Technology School, Korea Maritime and Ocean University, Busan 49112, Korea

Energies, 2018, vol. 11, issue 8, 1-19

Abstract: Captured CO 2 is in a subcritical state, whereas CO 2 deep underground is in a supercritical state because of the high geothermal heat and pressure. The properties of CO 2 can change rapidly at the critical point and in the near-critical region during the transportation and injection process. This study aims to identify the instabilities in the CO 2 flow in these regions, along with the causes and effects, during the transportation and injection process, and propose relevant design specifications. Thus, the critical points and near-critical region of CO 2 flow were numerically analyzed. The unstable region is presented in terms of temperature and pressure ranges, and the changes in the CO 2 properties in this region were analyzed. In the unstable region, the sudden change in density was similar to the density wave oscillation of a two-phase flow. The CO 2 stability map we obtained and the stability map of supercritical water show similar trends. Flow instability was also found to occur in standard CO 2 transportation pipelines. We demonstrate that flow instability in CO 2 transportation and injection systems can be avoided by maintaining the proposed conditions.

Keywords: supercritical CO 2; flow instability; stability map; CO 2 pipeline; carbon capture and storage (CCS) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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