CFD numerical simulation of particle suspension and hydromechanical stress in various designs of multi-stage bioleaching reactors
| Autor: | Céline Loubière, Anne-Gwenaëlle Guezennec, Eric Olmos, Stéphane Delaunay, Jonathan Chéron |
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| Přispěvatelé: | Laboratoire Réactions et Génie des Procédés (LRGP), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) |
| Rok vydání: | 2020 |
| Předmět: |
Computer simulation
Chemistry business.industry 0211 other engineering and technologies Metals and Alloys Continuous stirred-tank reactor 02 engineering and technology Mechanics Dissipation Power number Computational fluid dynamics 7. Clean energy Industrial and Manufacturing Engineering food.food Impeller Elephant ear food 020401 chemical engineering Materials Chemistry Shear stress [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering 0204 chemical engineering business 021102 mining & metallurgy |
| Zdroj: | Hydrometallurgy Hydrometallurgy, Elsevier, 2020, 197, pp.105490. ⟨10.1016/j.hydromet.2020.105490⟩ |
| ISSN: | 0304-386X |
| DOI: | 10.1016/j.hydromet.2020.105490 |
| Popis: | International audience; The performance of bioleaching stirred tank reactors (STR) is related to the homogeneity of biomass, substrates and dissolved gases. This work was focused on the characterization of the impeller design on bioreactor hydrodynamics and, more specifically on power, mixing efficiency and particle stress. Few studies addressed the issue of the impact of the impeller design on these, especially for multi-stage bioreactors which are the most commonly used at the industrial scale. To fill this lack, a two-stage solid-liquid computational fluid dynamics (CFD) model was simulated on more than 50 conditions to assess power consumption, dissipated power, suspension quality and particle stress. A dual impeller configuration was chosen using Rushton turbines, R600, Hydrofoil, Elephant Ear and HTPG impellers. Grinded pyrite-rich materials (average particles size: 80 μm) were considered as the solid phase at 3 different solid concentrations (10, 18 and 26% w/w). Considering the impeller power number (Np), the configuration with an axial impeller consumed less energy than a radial impeller in concordance with literature data. The results show that the impeller design had few to no effect on mixing efficiency considering a given power dissipation per unit volume. Independently on the impeller used, unique relationships were found between particle stress and mixing efficiency. This study gives new insights for reactor design and scaling of bioleaching stirred tank reactor and more specifically on the reduction of shear stress for the attached bacterial communities |
| Databáze: | OpenAIRE |
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