Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Techno-Economic Analysis of Reversible Solid Oxide Fuel Cell System Couple with Waste Steam

폐스팀을 이용한 가역 고체산화물 연료전지의 기술적 경제적 해석

  • GIAP, VAN-TIEN (Department of Environment & Energy Mechanical Engineering, University of Science and Technology (UST)) ;
  • LEE, YOUNG DUK (Department of Environment & Energy Mechanical Engineering, University of Science and Technology (UST)) ;
  • KIM, YOUNG SANG (Department of Clean Fuel & Power Generation, Korea Institute of Machinery & Materials (KIMM)) ;
  • AHN, KOOK YOUNG (Department of Environment & Energy Mechanical Engineering, University of Science and Technology (UST))
  • 잡반티엔 (과학기술연합대학원대학교 환경에너지기계공학) ;
  • 이영덕 (과학기술연합대학원대학교 환경에너지기계공학) ;
  • 김영상 (한국기계연구원 청정연료발전연구실) ;
  • 안국영 (과학기술연합대학원대학교 환경에너지기계공학)
  • Received : 2019.01.07
  • Accepted : 2019.02.28
  • Published : 2019.02.28
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Abstract

Reversible solid oxide fuel cell (ReSOC) system was integrated with waste steam for electrical energy storage in distributed energy storage application. Waste steam was utilized as external heat in SOEC mode for higher hydrogen production efficiency. Three system configurations were analyzed to evaluate techno-economic performance. The first system is a simple configuration to minimize the cost of balance of plant. The second system is the more complicated configuration with heat recovery steam generator (HRSG). The third system is featured with HRSG and fuel recirculation by blower. Lumped models were used for system performance analyses. The ReSOC stack was characterized by applying area specific resistance value at fixed operating pressure and temperature. In economical assessment, the levelized costs of energy storage (LCOS) were calculated for three system configurations based on capital investment. The system lifetime was assumed 20 years with ReSOC stack replaced every 5 years, inflation rate of 2%, and capacity factor of 80%. The results showed that the exergy round-trip efficiency of system 1, 2, 3 were 47.9%, 48.8%, and 52.8% respectively. The high round-trip efficiency of third system compared to others is attributed to the remarkable reduction in steam requirement and hydrogen compression power owning to fuel recirculation. The result from economic calculation showed that the LCOS values of system 1, 2, 3 were 3.46 ¢/kWh, 3.43 ¢/kWh, and 3.14 ¢/kWh, respectively. Even though the systems 2 and 3 have expensive HRSG, they showed higher round-trip efficiencies and significant reduction in boiler and hydrogen compressor cost.

Keywords

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Fig. 1. Schematics of SOEC mode couple with waste steam – system 1

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Fig. 2. Schematics of SOFC mode couple with waste steam – all systems

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Fig. 3. Schematics of SOEC mode couple with waste steam – system 2

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Fig. 4. Schematics of SOEC mode couple with waste steam – system 3

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Fig. 5. Round-trip efficiencies of three defined systems at de-sign point

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Fig. 6. Levelized cost of storage of three system configurations

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Fig. 7. Cost of component in 2017 in three system configurations

Table 1. System specification and variables

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Table 2. Purchased equipment cost7-14)

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