Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Numerical Analysis of Flow Characteristics in an Injection Tubing during Supercritical CO2 Injection: Application of Demonstration-scale CO2 Storage Project in the Pohang Basin, Korea

초임계 상태의 CO2 주입시 주입관내 유동 특성의 수치해석적 연구: 포항분지 중소규모 CO2 지중저장 실증 사업에 적용

  • Jung, Woodong (Dept. of Earth Resources and Environmental Engineering, Hanyang University) ;
  • Sung, Wonmo (Dept. of Earth Resources and Environmental Engineering, Hanyang University) ;
  • Han, Jeongmin (KOGAS Research Institute, Korea Gas Corporation) ;
  • Song, Youngsoo (Dept. of Earth Resources and Environmental Engineering, Hanyang University) ;
  • Wang, Jihoon (Dept. of Earth Resources and Environmental Engineering, Hanyang University)
  • 정우동 (한양대학교 자원환경공학과) ;
  • 성원모 (한양대학교 자원환경공학과) ;
  • 한정민 (한국가스공사 가스연구원) ;
  • 송영수 (한양대학교 자원환경공학과) ;
  • 왕지훈 (한양대학교 자원환경공학과)
  • Received : 2022.05.31
  • Accepted : 2022.07.26
  • Published : 2022.08.31
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Abstract

This paper is the continuation of our previous paper, which we refer to as numerical analysis of phase behavior and flow properties in an injection tubing during gas phase CO2 injection. Our study in this paper show the results during supercritcal CO2 injection under the same project. Geological CO2 storage technology is one of the most effective method to decrease climate change due to high injectivity and storage capacity and economics. A demonstration-scale CO2 storage project was performed in a deep aquifer in the Pohang basin, Korea for a technological development in a large-scale CO2 storage project. A problem to consider in the early stage design of the project was to analyze CO2 phase change and flow characteristics during CO2 injection. To solve this problem, injection conditions were decided by calculating injection rate, pressure, temperature, and thermodynamic properties. For this research, we simulated and numerically analyzed CO2 phase change from liquid to supercritical phase and flow characteristics in injection tubing using OLGA program. Our results provide discharge pressure and temperature conditions of CO2 injection combined with a pressure of an aquifer.

본 연구는 기존 연구에서 다루었던 기체상태의 CO2를 송출시 주입관내 상변화 및 유동특성 연구의 계속으로 액체 상태의 CO2를 송출하여 초임계 상태로 주입시의 연구 결과이다. 지중에 CO2를 저장하는 기술은 높은 주입성, 저장량 및 경제성으로 기후 변화를 완화하는 효율적인 방법중 하나이다. 심부 대수층에 CO2를 주입 및 저장하는 실증 프로젝트인 포항분지 CO2 지중저장 사업은 미래 대규모 CO2 지중 저장 사업에 필요한 기술을 개발하는데 목적이 있다. 이 사업의 설계 단계에서 고려해야 하는 문제 중 하나는 CO2를 주입시 주입관내 CO2의 상(phase)변화 및 그에 따른 유동특성의 분석이다. 이러한 문제 해결을 위해 주입량에 따른 압력, 온도 및 열역학적인 물성값 등을 계산하여 주입설비의 송출 조건을 결정한다. 본 연구를 위해 액체 상태의 CO2를 송출하고 초임계로 변하는 주입관내 상변화 및 유동 특성을 OLGA 프로그램을 사용하여 수치해석적으로 분석하였다. 결과를 통하여 CO2의 주입 시스템과 저장소의 공저압을 연계하는 주입 송출 조건을 제시하였다.

Keywords

Acknowledgement

본 연구는 산업통상자원부의 연구과제 대심도 해양 탐사시추를 통한 대규모 CO2 지중저장소 확보 프로젝트(20214710100050)로 부터 지원받아 수행되었으며, 지원에 감사를 드립니다.

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