Optimization of Inert Gas Feeding Strategy in a Fixed-Bed Reactor for Efficient Water Splitting Via Solar-Driven Thermal Reduction of Nonstoichiometric CeO2
JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME(2022)
Abstract
In this study, a solar-driven reduction process of nonstoichiometric cerium oxide in a fixed bed is optimized for efficient water splitting via metal-oxide-based redox cycling. Nitrogen is used as sweeping gas to scavenge oxygen from the beds during the reduction process. A transient lumped heat transfer model is developed for the simulation of the process. Parametric analysis and genetic algorithm are used to find the optimal N-2 flow rate and establish a novel N-2 feeding strategy with variable flow to maximize the thermal efficiency for water splitting. An efficiency close to 13% is estimated without solid-phase heat recovery, which is more than twice that of the best present experimental systems (similar to 5%). The results are regarded preliminary as a thermodynamic analysis.
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Key words
solar thermochemistry,water splitting,nonstoichiometry,cerium oxide,genetic algorithm,hydrogen,solar reactor,thermodynamics
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