期刊
CHEMICAL ENGINEERING SCIENCE
卷 227, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2020.115858
关键词
Iron ore reduction; Fluidized beds; Computational fluid dynamics; Discrete element method; Reduction models; Unreacted shrinking core model
资金
- Austrian Federal Ministry for Digital and Economic Affairs
- National Foundation for Research, Technology and Development
- K1-MET GmbH, metallurgical competence center
- COMET (Competence Center for Excellent Technologies), the Austrian program for competence centers
- Federal Ministry for Transport, Innovation and Technology
- Federal Ministry for Digital and Economic Affairs
- province of Upper Austria
- province of Tyrol
- province of Styria
- COMET
- Primetals Technologies Austria GmbH
- voestalpine Stahl Donawitz GmbH
- RHI Magnesita GmbH
- voestalpine Stahl GmbH
The aim of this work is the investigation of the indirect reduction of hematite in fluidized beds and the effects of different kinetic parameters on the reduction process at a numerical level, which are validated against experimental results. We utilize a CFD-DEM coupling method, where gas phase is represented by classic CFD and iron ores by DEM. Both phases are strongly coupled by heat and mass transfer. The particle reduction is modeled using unreacted shrinking core model taking into account the morphological changes of the ore. The model is validated and critical reaction parameters such as the activation energies, pre-exponenital factors and equilibrium constants are investigated. It sheds light on how much an influence the kinetic parameters have on the reduction degree and becomes evident that the rate determining step is reduction from wustite to iron. The model is then applied to a lab-scale fluidized bed reactor. (C) 2020 Elsevier Ltd. All rights reserved.
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