Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Power Generation of Blue Hydrogen Fuel Cells using Mineral Carbonation and Analysis of CO2 Reduction through Waste Heat Rankine Cycle

광물 탄산화를 이용한 블루 수소 연료전지 발전과 폐열 랭킨 사이클을 통한 CO2 저감량 분석

  • SangJin Lim (Department of Marine System Engineering, Graduate School of Mokpo National Maritime University) ;
  • YoonHo Lee (Division of Coast Guard, Mokpo National Maritime University)
  • 임상진 (목포해양대학교 기관시스템공학과 대학원 ) ;
  • 이윤호 (목포해양대학교 해양경찰학부)
  • Received : 2024.07.15
  • Accepted : 2024.11.13
  • Published : 2024.12.31
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Abstract

In this study, the CO2 reduction and power generation of the entire system according to the mineral carbonization, high and low temperature waste heat Rankine cycle were calculated. The power generation system was designed using the UniSim R460 program. As a result of the study, the CO2 capture rate through mineral carbonation was 96.8%, and the carbonation conversion rate of 99.2%. This reduced the total CO2 generation by about 44%, and led to a decrease in carbon dioxide generation compared to net power generation. By using both HRC and LRC, the power generation could be increased compared to using one Rankine cycle. when the Rankine cycle was applied to the mineral carbonization-based blue hydrogen process system, CO2 generation was reduced by about 59%, and net power generation was increased by about 62%. As a result, compared to the existing gray hydrogen power generation, it was investigated that 0.3 kgCO2/kWh of carbon dioxide and 74.6% of CO2 were reduced.

본 논문에서는 광물 탄산화, 고온 및 저온 폐열 랭킨 사이클에 따른 전체 시스템의 CO2 저감량과 발전량을 산출하기위한 시스템 공정을 설계하였다. 해당 발전 시스템은 UniSim R470 프로그램을 이용해 설계됐다. 연구 결과 광물 탄산화를 통한 CO2 포집률은 96.8%였으며 99.2%의 Carbonation 전환율을 확인했다. 이를 통해 총 CO2 발생량 약 44% 감소와 순 발전량 대비 이산화탄소 발생량의 감소를 확인하였다. 또한, HRC와 LRC를 동시에 활용함으로써 하나의 랭킨 사이클을 사용할 때보다 발전량을 늘릴 수 있었다. 따라서 광물탄산화기반 블루수소 공정 시스템에 랭킨사이클을 적용한 경우 CO2 발생량이 약 59%가 저감되었고, 순 발전량이 약 62% 증가하는 것을 확인하였다. 결과적으로 기존 그레이 수소 발전에 비하여 0.3kg CO2/kWh의 전력량 대비 이산화탄소 발생량과 74.6%의 CO2 발생량 감소를 확인했다.

Keywords

Acknowledgement

이 논문은 2024년도 정부(교육부)의 재원으로 한국연구재단 국립대학육성사업의 지원을 받아 수행된 연구임

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