Journal
CHEMICAL ENGINEERING JOURNAL
Volume 150, Issue 2-3, Pages 502-508Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2009.03.012
Keywords
Zinc; Oxide; Dissociation; Ablation; Water splitting; Thermochemical; Cycle; Hydrogen; Solar; Energy; Reactor; Heat transfer; Radiation
Categories
Funding
- Swiss Federal Office of Energy (SFOE)
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A transient heat transfer model is developed for analyzing the thermal performance of a thermochemical reactor for the solar-driven dissociation of ZnO in the 1600-2136 K range. The reactor consists of a rotating cavity-receiver lined with ZnO particles that are directly exposed to concentrated solar radiation. The model couples radiation, convection, and conduction heat transfer to the reaction kinetics for a shrinking domain and simulates a transient ablation regime with semi-batch feed cycles of ZnO particles. Validation is accomplished in terms of the numerically calculated and experimentally measured temperature profiles and reaction extents for a 10 kW reactor prototype tested in a high-flux solar simulator and subjected to peak solar concentration ratios exceeding 5000 suns. Scaling-up the reactor technology to 1 MW solar thermal power input has the potential of reaching a solar-to-chemical energy conversion efficiency of 56%. (C) 2009 Elsevier B.V. All rights reserved.
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