한국가스학회지 (Journal of the Korean Institute of Gas)

  • 제28권2호
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  • Pages.7-16
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  • 2024
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  • 1226-8402(pISSN)
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  • 2713-6922(eISSN)
한국가스학회 (The Korean Institute of GAS)
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대규모 수소 저장을 위한 암염 공동 저장 기술 특성 및 적용 사례 분석

Investigation on the Technical Characteristics and Cases of Salt Cavern for Large-Scale Hydrogen Storage

  • 조성학 (전남대학교 에너지자원공학과) ;
  • 이정환 (전남대학교 에너지자원공학과)
  • Seonghak Cho (Department of Energy and Resources Engineering, Chonnam National University) ;
  • Jeonghwan Lee (Department of Energy and Resources Engineering, Chonnam National University)
  • 투고 : 2024.02.23
  • 심사 : 2024.04.09
  • 발행 : 2024.06.30
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초록

본 연구에서는 대규모 수소 저장을 위한 암염 공동(salt cavern) 저장 공법의 기술 특성과 현장사례 분석을 수행하였다. 암염 공동 저장 방식은 공동을 구성하는 암염(rock salt)의 낮은 공극률(porosity)과 투과도(permeability)로 인해 누출이 잘 일어나지 않고, 운영을 위한 쿠션 가스(cushion gas)의 양이 적어 타 공법 대비 효과적인 수소 저장이 가능하다. 암염-수소 간 화학적 반응이 거의 일어나지 않으며 다수의 주입/배출 사이클을 수행할 수 있어 피크 쉐이빙(peak shaving) 및 단주기 저장에 효과적이다. 공동은 크게 침출(leaching), 염수제거(debrining), 충진(filling)의 3단계로 형성되며 누출 실험을 통해 공동의 안정성을 평가한다. 현재 영국과 미국 Texas 주의 4개소에서 주변 지역의 산업 수요를 충당하기 위한 현장 적용이 이루어지고 있으며, 독일, 프랑스와 같은 유럽 지역에서 에너지 저장을 위한 암염 공동 운영을 준비하고 있다. 본 연구 결과는 향후 수소 저장 프로젝트 설계를 위한 기초자료로 활용될 수 있을 것으로 기대된다.

This study presents investigation on the technical characteristics and field cases of the salt cavern storage method for large-scale hydrogen storage. The salt cavern storage method enables effective hydrogen storage compared to other methods due to the low porosity and permeability of the rock salt that constitutes the cavern, which is not likely to leak and requires a small amount of cushion gas for operation. In addition, there is no chemical reaction between rock salt and hydrogen, and multiple injection/withdrawl cycles can be performed making it effective for peak shaving and short-term storage. The salt cavern is formed in three stages: leaching, debrining, and filling, and leakage tests are conducted to ensure stable operation. Field applications are currently performing to meet industrial demand in the surrounding area of four sites in the UK and Texas, USA, and salt cavern operation is being prepared for energy storage in European countries such as Germany and France. The investigated results in this study can be utilized as a basic guideline for the design of future hydrogen storage projects.

키워드

과제정보

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었습니다(과제번호 RS-2022-00143541). 또한 본 연구는 한국에너지기술평가원(KETEP)의 지원을 받아 수행되었습니다(No. 20212010200010).

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