Experimental Investigation of the Solar Carbothermic Reduction of ZnO Using a Two-cavity Solar Reactor

[+] Author and Article Information
T. Osinga, A. Steinfeld

ETH-Swiss Federal Institute of Technology, Department of Mechanical and Process Engineering, ETH-Zentrum, CH-8092 Zurich, Switzerland

U. Frommherz

Solar Process Technology, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

C. Wieckert

Solar Process Technology, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

J. Sol. Energy Eng 126(1), 633-637 (Feb 12, 2004) (5 pages) doi:10.1115/1.1639001 History: Received May 01, 2003; Revised May 01, 2003; Online February 12, 2004
Copyright © 2004 by ASME
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Optical Scheme at PSI’s Solar Furnace
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Optical Scheme at ETH’s High-Flux Solar Simulator
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Scheme of solar reactor configuration
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H-T diagram of the ZnO+C process for a stoichiometric molar mixture
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Solar power input, reactor temperature, and product gas flow rates during a representative batch run with 500 g of ZnO-C mixture (C:ZnO molar ratio 0.8:1), using beech charcoal as reducing agent. The solar blind pyrometer used to record the inner cavity temperature operates at above 800 K.
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Energy balance for 3 batch runs at PSI’s solar furnace, in terms of percent of Qsolar
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Reaction rates versus temperature for different carrier gas flows, carbon materials (beech charcoal, activated charcoal and petcoke) and C:ZnO ratios
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Influence of the stochiometric molar ratio C:ZnO on the integral chemical conversion of ZnO to Zn within tests of 32 min




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