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TECHNICAL PAPERS

The Development of a Solar Chemical Reactor for the Direct Thermal Dissociation of Zinc Oxide

[+] Author and Article Information
S. Möller, R. Palumbo

Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

J. Sol. Energy Eng 123(2), 83-90 (Nov 01, 2000) (8 pages) doi:10.1115/1.1349717 History: Received April 01, 2000; Revised November 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Schematic representation of the two-step water-splitting cycle using the Zn/ZnO redox system for the solar production of hydrogen
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Schematic of SLOPE—a solar chemical reactor for the solar thermal decomposition of ZnO. Legend: 1 = reactor chamber; 2 = ZnO-slope; 3 = quartz glass window; 4 = outlet for non-reacted ZnO; 5 = feeding system; 6 = inert gas streams; 7 = chimney for gaseous products
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Schematic of the model - It is a semi infinite solid of ZnO
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Calculated temperature profile in thermally decomposing semi infinite wall of solid ZnO for property and input values indicated in the text
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Calculated velocity profile in thermally decomposing semi infinite wall of solid ZnO. Values are negative due to defined coordinate system in Fig. 3. The property and input values are indicated in the text.
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Front view of reactor with an 18 cm aperture window for coupling concentrated sunlight into a chemical process
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Comparison between experimental and calculated decomposition mass fluxes depending on q̇solar. The error bars are shown only for the experimental data. It is presumed that there is no error in q̇solar.
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Orientations of the three gas flows
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Flow patterns for different gas flow conditions; a) circulation near the chimney, which occurs in all experiments. b) the particles draw first backwards at the flow condition 1) 19 lNmin−1, 2) 20 lNmin−1, 3) 28 lNmin−1; c) the particles draw first to the window at the flow condition 1) 20 lNmin−1, 2) 10 lNmin−1, 3) 5 lNmin−1.
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Schematic of the latest design for the entrances of the curtain of gas protecting the window

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