Influence of Insulation Characteristics and Operational Modes on the Storage Efficiency in Underground Caverns for Compressed Air Energy Storage (CAES)

Hyung-Mok Kim; Hyunwoo Kim; Dong-Woo Ryu; Eui-Seob Park

doi:10.12972/ksmer.2014.51.6.820

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2014 Vol.51, Issue 6 Preview Page Next Page

Technical Report

Influence of Insulation Characteristics and Operational Modes on the Storage Efficiency in Underground Caverns for Compressed Air Energy Storage (CAES) 단열특성 및 운영모드가 압축공기에너지 지하저장 공동의 저장효율에 미치는 영향

31 December 2014. pp. 820-828

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Abstract

Compressed air energy storage (CAES) is one of the electric energy storage systems at a large scale. Recent numerical studies and in-situ pilot tests have demonstrated that lined rock caverns (LRC) is feasible for an underground storage space of the CAES even at a shallow depth. In this study, we investigated the influence of insulation and operational conditions of the LRC on its storage efficiency to optimize the economical feasibility and so as to include in designing specification and operational conditions of the caverns. In evaluating the efficiency, the energy balance equation developed by our previous study, where pressure and temperature estimation produced by TOUGH2 analysis were used as an input, was employed. From the analysis results, we showed that the effect of insulation condition was comparatively insignificant to a storage efficiency but, the efficiency can be improved when the duration of compression-injection period during a daily operation becomes longer, since the temperature variation inside the LRC is reduced under these conditions.

Keywords

Underground storage

Compressed air energy storage

Lined rock caverns

Insulation

Operational mode

Storage efficiency

복공식 암반공동(lined rock cavern, LRC)은 대용량 전력저장 장치로서의 압축공기에너지 발전시스템의 저장 공간으로 비교적 천심도에도 설치 가능함이 최근의 수치해석 결과 및 실증실험 결과를 통해 검증된 바 있다. 본 연구에서는 압축공기에너지의 지하저장을 위한 LRC 저장공동의 경제성 향상 및 운영 효율을 극대화하기 위한 공동 사양 및 운영 조건 설정을 목적으로 LRC 단열사양, 운영 모드 및 주입 온도가 저장 효율에 미치는 영향을 분석하였다. 저장 효율 평가를 위해서는 기 개발된 LRC 저장공동의 에너지수지 기본식과 TOUGH2 해석코드를 이용한 온도·압력 예측 해석 결과를 이용하였다. 분석 결과, LRC 저장공동 단열조건은 저장효율에 큰 영향을 미치지 않았으며, 1일 운전과정 중 압축-저장 시간이 길어질수록 공동 내 온도변화량이 감소하여 저장효율이 증가하는 결과를 보였다.

키워드

지하저장

압축공기에너지

복공식 암반공동

단열

운영모드

저장효율

References

KIGAM (Korea Institute of Geoscience and Mineral Resources), 2012, Development of Underground Energy Storage System in Lined Rock Cavern, Ministry of Knowledge Economy, Korea.

Kim, H.M., Park, D.H., Ryu, D.W., Choi, B.H. and Song, W.K., 2011, “Thermodynamic energy balance analysis of underground lined rock caverns (LRC) for compressed air energy storage (CAES),” Tunnel & Underground Space, Vol. 21, No.4, pp. 297-306.

Kim, H.M., Rutqvist, J., Ryu, D.W., Choi, B.H., Sunwoo, C. and Song, W.K., 2012a, “Exploring the concept of compressed air energy storage (CAES) in lined rock caverns at shallow depth: A modeling study of air tightness and energy balance,” Applied Energy, Vol. 92, pp. 653-667.

Kim, H.M., Ryu, D.W., Rutqvist, J., Park, D. and Song, W.K., 2012b, “Numerical Study on the Impact of Air Tight Liner of Underground Lined Rock Cavern for Compressed Air Energy Storage (CAES),” Journal of Korean Society of Geosystem Engineering, Vol. 49, No. 2, pp. 147-156.

Kushnir, R., Ayan, A. and Ullmann, A., 2012, “Temperature and pressure variations within compressed air energy storage caverns,” Int. J. Heat and Mass Transfer, Vol. 52, pp. 5616-5630.

Pruess, K., Oldenburg, C. and Moridis, G., 1999, TOUGH2 User’s Guide Version 2.0, LBNL-43134. p. 198.

Succar, S. and Williams, R.H., 2008, Compressed air energy storage: Theory, resources and applications for wind power, Princeton Environmental Institute (PEI), Princeton University. pp. 22-26.

Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 51
No :6
Pages :820-828
Received Date : 2014-09-17
Revised Date : 2014-12-29
Accepted Date : 2014-12-29
DOI :https://doi.org/10.12972/ksmer.2014.51.6.820

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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