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Medientyp: E-Artikel Titel: A packed‐bed solar reactor for the carbothermal zinc production – dynamic modelling and experimental validation Beteiligte: Tzouganatos, Nikolaos; Wieckert, Christian; Steinfeld, Aldo Erschienen: Wiley, 2016 Erschienen in: AIChE Journal, 62 (2016) 12, Seite 4586-4594 Sprache: Englisch DOI: 10.1002/aic.15522 ISSN: 0001-1541; 1547-5905 Schlagwörter: General Chemical Engineering ; Environmental Engineering ; Biotechnology Entstehung: Anmerkungen: Beschreibung: <jats:p>Integration of concentrated solar energy into the pyrometallurgical Zn production process as clean source of high‐temperature process heat could significantly reduce fossil fuels consumption and its concomitant CO<jats:sub>2</jats:sub> emissions. The solar‐driven carbothermal reduction of ZnO is investigated using a 10‐kW<jats:sub>th</jats:sub> solar reactor featuring two cavities, the upper one serving as the solar absorber and the lower one containing a packed‐bed of ZnO and beech charcoal as the biogenic reducing agent. Experimentation in a high‐flux solar simulator is carried out under radiative fluxes of 2300–2890 suns, yielding a peak solar‐to‐chemical energy conversion efficiency of 18.4%. The reactor performance under variable operating conditions is analyzed via a dynamic numerical model coupling heat transfer with chemical kinetics. The model is validated by comparison to the experimental data obtained with the 10‐kW<jats:sub>th</jats:sub> packed‐bed solar reactor and further applied to predict the effect of incorporating semi‐continuous feeding of reactants on the process efficiency. © 2016 American Institute of Chemical Engineers <jats:italic>AIChE J</jats:italic>, 62: 4586–4594, 2016</jats:p>