압축공기에너지저장 : 복공식 저장공동의 기술 현황
Compressed Air Energy Storage : State-of-the-Art of Lined Rock Cavern
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초록
재생에너지 통합 시장의 확대가 예상됨에 따라 암염 공동을 활용한 기존 CAES의 입지 제약성을 해결하기 위해 제안되었던 암반굴착 방식인 복공식 저장공동에 대한 관심이 높아지고 있다. 본고에서는 복공식 저장공동의 기밀성능과 내압성능을 확보하기 위한 기술적 현안으로 기밀성 평가, 지반 융기에 대한 민감도 분석, LRC 구성 요소에 대한 설계 기법, EDZ 평가, 그리고 열-수리-역학적상호작용 등에 대한 주요 연구 사례를 소개하였다. 또한 기밀성과 지반 융기와 같은 지반 안정성에영향을 미치는 LRC 설계인자들의 민감도 분석, 확률론적 접근법에 기초한 설계 제원 결정, 굴착손상대 평가와 그 영향에 대한 분석, 열-수리-역학적 상호작용 해석에 기초한 에너지 균형 분석 및CAES 운영 전략 등에 관한 기술적 의미들을 분석하였다.
Abstract
As the market for renewable integration is expected to grow, there is an increasing interest in excavated rock caverns as a solution to overcome the limitations of conventional CAES that use solution-mined salt caverns. One of the major challenges is ensuring the air tightness and pressure resistance performance of lined-rock caverns (LRCs). To address this, we reviewed research on several key aspects, including air tightness, ground uplifting, structural stability of the LRC, excavation damaged zone (EDZ), and thermal-hydraulic-mechanical (T-H-M) interactions. The technical implications of the sensitivity analysis of various design factors that affect the air tightness and stability of LRCs were investigated. We reviewed the reliability-based design of the LRC using a probabilistic approach and evaluated mechanical and hydraulic effects of the EDZ. Additionally, we performed the energy balance analysis based on the T-H-M coupled analysis and determined the optimal operation strategy for the CAES.
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