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CFD numerical simulation of particle suspension and hydromechanical stress in various designs of multi-stage bioleaching reactors
Hydrometallurgy ( IF 4.8 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.hydromet.2020.105490
Jonathan Chéron , Céline Loubière , Stéphane Delaunay , Anne-Gwénaëlle Guezennec , Eric Olmos

Abstract 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.

中文翻译:

多级生物浸出反应器不同设计中颗粒悬浮和流体力学应力的CFD数值模拟

摘要 生物浸出搅拌釜反应器(STR)的性能与生物质、底物和溶解气体的均匀性有关。这项工作的重点是生物反应器流体动力学叶轮设计的表征,更具体地说是功率、混合效率和颗粒应力。很少有研究涉及叶轮设计对这些的影响问题,特别是对于工业规模最常用的多级生物反应器。为了弥补这一不足,我们在 50 多种条件下模拟了两阶段固液计算流体动力学 (CFD) 模型,以评估功耗、耗散功率、悬浮液质量和颗粒应力。使用 Rushton 涡轮机、R600、Hydrofoil、Elephant Ear 和 HTPG 叶轮选择了双叶轮配置。研磨的富含黄铁矿的材料(平均粒径:80 μm)被认为是 3 种不同固体浓度(10%、18% 和 26% w/w)的固相。考虑到叶轮功率数 (Np),根据文献数据,轴向叶轮的配置比径向叶轮消耗的能量少。结果表明,考虑到给定的单位体积功率耗散,叶轮设计对混合效率几乎没有影响。独立于所使用的叶轮,在颗粒应力和混合效率之间发现了独特的关系。这项研究为生物浸出搅拌釜反应器的反应器设计和缩放提供了新的见解,更具体地说是减少附着细菌群落的剪切应力。18% 和 26% w/w)。考虑到叶轮功率数 (Np),根据文献数据,轴向叶轮的配置比径向叶轮消耗的能量少。结果表明,考虑到给定的单位体积功率耗散,叶轮设计对混合效率几乎没有影响。独立于所使用的叶轮,在颗粒应力和混合效率之间发现了独特的关系。这项研究为生物浸出搅拌釜反应器的反应器设计和缩放提供了新的见解,更具体地说是减少附着细菌群落的剪切应力。18% 和 26% w/w)。考虑到叶轮功率数 (Np),根据文献数据,轴向叶轮的配置比径向叶轮消耗的能量少。结果表明,考虑到给定的单位体积功率耗散,叶轮设计对混合效率几乎没有影响。独立于所使用的叶轮,在颗粒应力和混合效率之间发现了独特的关系。这项研究为生物浸出搅拌釜反应器的反应器设计和缩放提供了新的见解,更具体地说是减少附着细菌群落的剪切应力。结果表明,考虑到给定的单位体积功率耗散,叶轮设计对混合效率几乎没有影响。独立于所使用的叶轮,在颗粒应力和混合效率之间发现了独特的关系。这项研究为生物浸出搅拌釜反应器的反应器设计和缩放提供了新的见解,更具体地说是减少附着细菌群落的剪切应力。结果表明,考虑到给定的单位体积功率耗散,叶轮设计对混合效率几乎没有影响。独立于所使用的叶轮,在颗粒应力和混合效率之间发现了独特的关系。这项研究为生物浸出搅拌釜反应器的反应器设计和缩放提供了新的见解,更具体地说是减少附着细菌群落的剪切应力。
更新日期:2020-11-01
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