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http://dx.doi.org/10.7316/KHNES.2019.30.1.21

Techno-Economic Analysis of Reversible Solid Oxide Fuel Cell System Couple with Waste Steam  

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))
Publication Information
Transactions of the Korean hydrogen and new energy society / v.30, no.1, 2019 , pp. 21-28 More about this Journal
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
Electrical energy storage; Reversible solid oxide fuel cell; Renewable energy; Round-trip efficiency; Hydrogen storage; Waste steam; Waste heat;
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