Pulsed Gas Feeding for Stoichiometric Operation of a Gas-Solid Vortex Flow Solar Chemical Reactor

[+] Author and Article Information
Stefan Kräupl

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

Aldo Steinfeld

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

J. Sol. Energy Eng 123(2), 133-137 (Nov 01, 2000) (5 pages) doi:10.1115/1.1351172 History: Received June 01, 2000; Revised November 01, 2000
Copyright © 2001 by ASME
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H-T diagram for the reaction ZnO+CH4→Zn+2H2+CO. 1-2: heat ZnO and CH4 from 298 K to 1300 K; 2-3: chemical reaction at 1300 K; 3-4: cool Zn(g), 2H2 and CO to 1180 K; 4-5: phase transformation Zn(g)→Zn(l); 5-6: cool Zn (l), 2H2 and CO to 692 K; 6-7: phase transformation Zn(l)→Zn(s); 7-8: cool Zn(s), 2H2 and CO to 298 K. (Enthalpy reference temperature is 298.15 K)
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Variation of the solar thermal conversion efficiency as a function of the stoichiometric factor for various temperatures and solar flux concentration ratios
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Extent of the reduction of ZnO as a function of reactor temperature at 1 bar and for various stoichiometric factors
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Schematic of the reactor set-up. Legend: (1) spiral-type feeder; (2) reactor cavity; (3) primary CH4 inlet; (4) valve for CH4 pulse feeding; (5) programmable logic module; (6) quartz window; (7) secondary CH4 flow for window protection
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Measured average CH4 volume per single pulse as a function of the pulse duration
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Measured mass flow rate of CH4 as a function of the pulse rate
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Measured CH4 mass flow rate as a function of the ZnO mass flow rate for representative experiments conducted at PSI solar furnace




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