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2023 Vol.60, Issue 5S Preview Page

Research Paper

A Study on Prospective Carbon Dioxide Storage Resources at Hwasun Coal Mine

화순 탄광의 이산화탄소 탐사 저장자원량 평가

Sunlee Han1
,
Hyeonyeong Roh1
,
Youngbin Lee1
,
Chanyoung Yun1
,
Youngsoo Lee12*
한 선이1
,
노 현영1
,
이 영빈1
,
윤 찬영1
,
이 영수12*
1Department of Mineral Resources and Energy Engineering, Jeonbuk National University, Jeonju, Korea
2Department of Environment and Energy, Jeonbuk National University, Jeonju, Kroea
1전북대학교 자원‧에너지공학과
2전북대학교 환경에너지융합학과
*Corresponding Author
31 October 2023. pp. 366-376
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Abstract

South Korea's carbon neutrality policies are causing the domestic coal industry to contract, leading to interests in repurposing abandoned coal mines as CO2 storage sites. This study investigated the relationship between coal particle size and CO2 adsorption, specifically focusing on the Hwasun coal mine. The findings reveal that smaller coal particles exhibit higher CO2 adsorption capacities, demonstrating substantial storage potential. However, the injection of supercritical CO2 requires a depth of 800 m, whereas the Hwasun coal mine reaches a depth of only 560 m. Therefore, further exploration and capacity assessment are essential. Assuming a 1-m-thick coal layer below 800 m, the CO2 injection well could store 27–320 thousand tons of CO2. Additionally, even in the event of leakage into the lower tunnel, the high CO2 adsorption capacity of coal could effectively mitigate such occurrences.

Keywords
net zero
abandoned coal mine
CO2 adsorption
carbon capture and storage (CCS)

탄소중립 정책으로 국내 석탄산업이 축소되면서, 폐석탄광을 이산화탄소 지중저장소로 활용하는 대안이 제시되고 있다. 본 연구는 2023년 6월 폐광된 화순탄광의 이산화탄소 저장소로의 활용을 목적으로 현장 석탄시료에 대한 입자크기와 이산화탄소 흡착량간의 관계를 조사하였다. 그 결과 석탄입자가 작을수록 이산화탄소 흡착량이 증가하였고, 최대흡착량은 67.74에서 262.19 m3/ton로 측정되어 상당히 높은 흡착성을 보이는 것으로 나타났다. 다만, 초임계 상태의 이산화탄소를 주입하기 위해서는 800 m이상의 주입심도가 필요하며, 화순탄광의 경우 주가행심도가 560 m이므로 하부지층에 대한 탐사와 저장지층 흡착 능력 평가, 인근 이산화탄소 배출원과의 연계가 필요하다. 심도 800 m이상에서 화순탄광 석탄층의 두께를 1 m로 가정하면, 주입정 하나당 최소 2.7만 톤에서 32만 톤의 이산화탄소가 저장할 수 있는 것으로 판단되었다. 또한 갱도 하부의 미채광 석탄층 또는 사암층에 이산화탄소를 주입하면 상부로의 누출이 발생한다고 하더라도 석탄의 높은 이산화탄소 흡착성으로 인해 누출을 효과적으로 방지할 것으로 기대된다.

키워드
탄소중립
폐석탄광
이산화탄소 흡착
이산화탄소 지중저장
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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 : 60
  • No :5
  • Pages :366-376
  • Received Date : 2023-09-05
  • Revised Date : 2023-10-17
  • Accepted Date : 2023-10-26
  • DOI :https://doi.org/10.32390/ksmer.2023.60.5.366
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