Analysis of solar chemical processes for hydrogen production from water splitting thermochemical cycles

• DOI: 10.1016/j.enconman.2007.12.011
• Publication Date: 2008-02-07T12:32:36Z
• Authors: Patrice Charvin; Abanades Stéphane; Lemort Florent; Flamant Gilles
• Keywords: Thermochemical cycle; Metal oxide; [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Mechanics of the fluids [physics.class-ph]; 02 engineering and technology; 7. Clean energy; [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]; Concentrated solar energy; Economic assessment; 13. Climate action; Hydrogen production; 0202 electrical engineering, electronic engineering, information engineering; Process engineering; PIEnergie; [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph]

Abstract This paper presents a process analysis of ZnO/Zn, Fe3O4/FeO and Fe2O3/Fe3O4 thermochemical cycles as potential high efficiency, large scale and environmentally attractive routes to produce hydrogen by concentrated solar energy. Mass and energy balances allowed estimation of the efficiency of solar thermal energy to hydrogen conversion for current process data, accounting for chemical conversion limitations. Then, the process was optimized by taking into account possible improvements in chemical conversion and heat recoveries. Coupling of the thermochemical process with a solar tower plant providing concentrated solar energy was considered to scale up the system. An economic assessment gave a hydrogen production cost of 7.98$ kg−1 and 14.75$ kg−1 of H2 for, respectively a 55 MWth and 11 MWth solar tower plant operating 40 years.