@inproceedings{d5b5441d76ab40a1a2278376d3d7f387,
title = "EFFICIENT SOLAR THERMOCHEMICAL HYDROGEN PRODUCTION IN A REACTOR TRAIN SYSTEM WITH THERMOCHEMICAL OXYGEN REMOVAL",
abstract = "Solar Thermochemical Hydrogen Production (STCH) is a promising technology that uses high-temperature heat directly to split water. The authors have previously proposed a Reactor Train System (RTS) that addresses the largest source of inefficiency in state-of-the-art STCH systems – solid heat recovery – by using multiple moving reactors that exchange heat radiatively between STCH steps. In this work, another major source of inefficiency – oxygen removal during metal reduction – is addressed. Two oxygen pumping schemes are considered – vacuum pumping (VP) and thermochemical oxygen pumping (TcOP). For vacuum pumping, the modularity of RTS enables a {\textquoteleft}Pressure Cascade{\textquoteright} which reduces pumping work by a factor of four and the capex by a factor of five as compared to a single-step VP scheme. The optimized RTS + VP system achieves 31% heat-to-hydrogen conversion efficiency with ceria despite the low efficiency of vacuum pumps at low pressures. Thermochemical Oxygen Pumping (TcOP) uses a second redox material - SrFeO3 - to pump oxygen. This material is transported in reactors moving in the opposite direction to the main RTS train. The optimized RTS + TcOP achieves more than 40% heat-to-hydrogen efficiency, while producing twice as much hydrogen per kilogram of ceria as the RTS + VP system.",
keywords = "Hydrogen, Solar Fuel, Thermochemical Cycle",
author = "Patankar, {Aniket S.} and Wu, {Xiao Yu} and Wonjae Choi and Tuller, {Harry L.} and Ghoniem, {Ahmed F.}",
note = "Funding Information: This work has been supported by the Centers for Mechanical Engineering Research and Education at MIT and SUSTech. Publisher Copyright: Copyright {\textcopyright} 2022 by ASME.; ASME 2022 International Mechanical Engineering Congress and Exposition, IMECE 2022 ; Conference date: 30-10-2022 Through 03-11-2022",
year = "2022",
doi = "10.1115/IMECE2022-94821",
language = "English",
series = "ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)",
publisher = "American Society of Mechanical Engineers (ASME)",
booktitle = "Energy",
}