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

We propose a detailed conceptual design of a solar hybrid sulfur (HyS) cycle. 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 thus exceeds the Year 2015 DOE STCH target of STH >10%, and shows promise for meeting the Year 2020 target of 20%.
Authors:
ORCiD logo [1] ;  [2] ;  [2]
  1. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL). Strategic Development and Innovation
  2. Savannah River Consulting, LLC, Aiken, SC (United States)
Publication Date:
Report Number(s):
SRNL-STI-2017-00327
Journal ID: ISSN 0360-3199; PII: S0360319917327027; TRN: US1703063
Grant/Contract Number:
AC09-08SR22470
Type:
Accepted Manuscript
Journal Name:
International Journal of Hydrogen Energy
Additional Journal Information:
Journal Volume: 42; Journal Issue: 33; Journal ID: ISSN 0360-3199
Publisher:
Elsevier
Research Org:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F)
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 25 ENERGY STORAGE; hybrid sulfur cycle; concentrated solar; falling particle receiver; thermal energy storage; conceptual design
OSTI Identifier:
1407943