A packed-bed solar reactor for the carbothermal zinc production - dynamic modelling and experimental validation
| Autor: | Christian Wieckert, Aldo Steinfeld, Nikolaos Tzouganatos |
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| Rok vydání: | 2016 |
| Předmět: |
Packed bed
Environmental Engineering Materials science Waste management business.industry 020209 energy General Chemical Engineering Nuclear engineering Fossil fuel Energy conversion efficiency 02 engineering and technology 021001 nanoscience & nanotechnology Solar energy Carbothermic reaction Heat transfer 0202 electrical engineering electronic engineering information engineering Radiative transfer Solar simulator 0210 nano-technology business Biotechnology |
| Zdroj: | AIChE Journal. 62:4586-4594 |
| ISSN: | 0001-1541 |
| DOI: | 10.1002/aic.15522 |
| Popis: | 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 CO2 emissions. The solar-driven carbothermal reduction of ZnO is investigated using a 10-kWth 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 analysed 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-kWth packed-bed solar reactor and further applied to predict the effect of incorporating semi-continuous feeding of reactants on the process efficiency. This article is protected by copyright. All rights reserved. |
| Databáze: | OpenAIRE |
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