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TECHNICAL PAPERS

Solar Thermal Splitting of Zinc Oxide: A Review of Some of the Rate Controlling Factors

[+] Author and Article Information
Jacques Lédé, Enrique Elorza-Ricart, Monique Ferrer

Laboratoire des Sciences du Génie Chimique, CNRS-ENSIC, 1 rue Grandville–BP 451, F-54001 NANCY Cedex, France

J. Sol. Energy Eng 123(2), 91-97 (Dec 01, 2000) (7 pages) doi:10.1115/1.1351815 History: Received May 01, 2000; Revised December 01, 2000
Copyright © 2001 by ASME
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References

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Palumbo,  R., Lédé,  J., Boutin,  O., Elorza-Ricart,  E., Steinfeld,  A., Möller,  S., Weindenkaff,  A., Fletcher,  E. A., and Bielicki,  J., 1998, “The Production of Zn from ZnO in a High-Temperature Solar Decomposition Quench Process,” Chem. Eng. Sci., 53, 14, pp. 2503–2519.
Elorza-Ricart,  E., Martin,  P. Y., Ferrer,  M., and Lédé,  J., 1999, “Direct Thermal Splitting of ZnO Followed by a Quench. Experimental Measurement of Mass Balances,” J. Phys. IV, 9, Pr3, pp. 325–330.
Elorza-Ricart,  E., Ferrer,  M., and Lédé,  J., 2000, “Dissociation thermique directe de l’oxyde de zinc para voie solaire,” Entropie, 36, No. 228, pp. 55–59.
Elorza-Ricart, E., 1998, “Dissociation thermique solaire, suivie de trempe, de l’oxyde de zinc,” Diplome d’Etudes Approfondies, ENSIC-INPL-LSGC, Nancy, France.
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Villermaux,  J., Antoine,  B., Lédé,  J., and Soulignac,  F., 1986, “A New Model for Thermal Volatilization of Solid Particles Undergoing Fast Pyrolysis,” Chem. Eng. Sci., 41, 1, pp. 151–157.
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Figures

Grahic Jump Location
Schemes of the 3 experimental set-up used for studying: the thermal splitting of ZnO samples (A); the whole process inside an image furnace (B); the quench phenomena (C)
Grahic Jump Location
Theoretical and experimental variations of the mean ablation velocities (umexp and umth) as a function of the time of irradiation t. The available flux density is 6×106 W m−2.
Grahic Jump Location
Theoretical variations of the mean radial temperature Tm and of the partial zinc pressure PZn as a function of the abscissa z inside the quench zone. Their intersections with the curves representing the saturated zinc partial pressure PZnsat and the zinc solidification temperature TZnsol give respectively the two theoretical abscissa of zinc condensation and solidification (calculations made with two inlet temperatures Tmi:1000 and 1100 K and QAr=4.9×10−5 m3 s−1 STP).
Grahic Jump Location
Conceptual representation of an ideal plug flow reactor including in series the solar section of high temperature ZnO dissociation (D), followed by several subparts of the quench section (Q1, Q2, Q3)

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