Hydrodynamics of a slurry airlift reactor at high solid concentrations
Hydrodynamics of a slurry airlift reactor at high solid concentrations
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DOI：
10.1016/j.ces.2007.08.025
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发表时间：
2007-12
影响因子：
4.7
通讯作者：
Malin Liu;Tiefeng Wang;Wei Yu;Jin-fu Wang
中科院分区：
文献类型：
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作者：
Malin Liu;Tiefeng Wang;Wei Yu;Jin-fu Wang
对高固含量浆态气升式反应器的流体力学特性进行了实验研究。考察了平均固含率、平均气含率和液体循环速度随平均固含率、表观气速和颗粒粒径的变化规律。用电导率探针测量了局部固含率。在低固含率或高表观气速下，固含率的径向分布是均匀的。在高固含率下，固含率的径向分布是不均匀的，在壁面附近具有较高的值。这种径向不均匀性随着表观气速的降低或平均固体浓度的增加而增加。横截面平均固含率的轴向分布在这项工作中的所有条件下是均匀的，即使在高固体浓度。平均气含率和液体循环速度随表观气速的增大而增大，随平均固体浓度的增大而减小。提出了一个基于横向提升力和湍流扩散力平衡的固含率径向分布的数学模型。合理的预测，从这个模型与可调的模型参数。
The hydrodynamics of a slurry airlift reactor at high solid concentrations were experimentally studied. The influences of the average solid concentration, superficial gas velocity and particle size on the radial and axial profiles of the solid holdup, average gas holdup and liquid circulation velocity were investigated. The local solid holdup was measured with an electrical conductivity probe. At low solid concentrations or high superficial gas velocities, the radial profile of the solid holdup was uniform. At high solid concentrations, the radial profile of the solid holdup was nonuniform, with higher values near the wall. This radial nonuniformity increased with decreased superficial gas velocity or increased average solid concentration. The axial profile of the cross-sectional average solid holdup was uniform at all conditions in this work, even at high solid concentrations. The average gas holdup and liquid circulation velocity increased with the superficial gas velocity but decreased with the average solid concentration. A mathematical model based on the balance of the transverse lift force and turbulent dispersion force was proposed to predict the radial profile of the solid holdup. Reasonable predictions were obtained from this model with an adjustable model parameter.