Development of the hybrid sulfur cycle for use with concentrated solar heat. I. Conceptual design

TitleDevelopment of the hybrid sulfur cycle for use with concentrated solar heat. I. Conceptual design
Publication TypeJournal Article
AuthorsGorensek MB, Corgnale C, Summers WA
JournalInternational Journal of Hydrogen Energy
Volume42
Issue33
Pagination20939-20954
ISSN0360-3199
Abstract

A detailed conceptual design of a solar hybrid sulfur (HyS) cycle is proposed. Numerous design tradeoffs, including process operating conditions and strategies, methods of integration with solar energy sources, and solar design options were considered. A baseline design was selected, and process flowsheets were developed. Pinch analyses were performed to establish the limiting energy efficiency. Detailed material and energy balances were completed, and a full stream table prepared. Design assumptions include use of: location in the southwest US desert, falling particle concentrated solar receiver, indirect heat transfer via pressurized helium, continuous operation with thermal energy storage, liquid-fed electrolyzer with PBI membrane, and bayonet-type acid decomposer. Thermochemical cycle efficiency for the HyS process was estimated to be 35.0%, LHV basis. The solar-to-hydrogen (STH) energy conversion ratio was 16.9%. This exceeds the Year 2015 DOE STCH target of STH >10%, and shows promise for meeting the Year 2020 target of 20%.

Notes

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URLhttp://www.sciencedirect.com/science/article/pii/S0360319917327027
DOI10.1016/j.ijhydene.2017.06.241
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