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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Modeling on the hydrodynamics of pressurized high-flux circulating fluidized beds (PHFCFBs) by Eulerian-Lagrangian approach
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Modeling on the hydrodynamics of pressurized high-flux circulating fluidized beds (PHFCFBs) by Eulerian-Lagrangian approach

机译：欧拉-拉格朗日方法对高压高通量循环流化床（PHFCFBs）的流体动力学建模

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摘要

A novel Eulerian-Lagrangian approach based on the multi-phase particle-in-cell (MP-PIC) methodology was applied in the simulation of the hydrodynamic behavior of pressurized high-flux circulating fluidized beds (DHFCFBs) in this work. The sensitivities of key model (i.e. the drag model) and modeling parameters (particle-particle restitution coefficient, normal particle-wall restitution coefficient, and tangential particle-wall restitution coefficient) on the predictions have been tested systematically. Experimental results of Richtberg et al. [Powder Technol. 2005,155(2), 145-152] and Yin et al. [Chem. Eng. TechnoL 2012,35(5), 904-910] were used as a numerical benchmark to assess the simulations quantitatively. The results show that the Gidaspow drag model displays better agreement with both the axial profiles of pressure drop and the radial distributions of particle volume fraction. Compared with the perfectly elastic particle collision (e_p = 1.0), the non-ideal particle-particle interaction could get more reasonable prediction results. The particle-wall restitution coefficient has somewhat of an effect on the simulated gas-solid flow behaviors in the risers. However, no critical changes of simulated flow characteristic in the trends of pressure drop and solid volume fraction distribution have been found. Based on the comparison of simulation results with experiments, a suitable model (i.e., Gidaspow drag model) and a group of modeling parameters, namely a particle-particle restitution coefficient (e_p = 0.9), a normal particle-wall restitution coefficient (e_(wn) = 0.1) and a free-slip boundary condition (i.e. the tangential particle-wall restitution coefficient, e_(WT) = 1.0) for modeling the hydrodynamic behavior in the DHFCDB riser were determined and verified.
机译：在这项工作中，基于多相孔内粒子（MP-PIC）方法的新颖的欧拉-拉格朗日方法被用于模拟加压高通量循环流化床（DHFCFBs）的流体力学行为。系统地测试了关键模型（即阻力模型）和建模参数（颗粒-颗粒恢复系数，法向颗粒-壁恢复系数和切向颗粒-壁恢复系数）的敏感性。 Richtberg等人的实验结果。 [粉末技术。 2005,155（2），145-152]和Yin等。 [化学。 。 TechnoL 2012,35（5），904-910]被用作数值基准来定量评估模拟。结果表明，Gidaspow阻力模型与压降的轴向分布和颗粒体积分数的径向分布都显示出更好的一致性。与理想的粒子碰撞（e_p = 1.0）相比，非理想的粒子间相互作用可以得到更合理的预测结果。颗粒壁恢复系数对立管中模拟的气固流动行为有一定影响。然而，在压降和固体体积分数分布的趋势中，没有发现模拟流动特性的关键变化。根据仿真结果与实验结果的比较，选择合适的模型（即Gidaspow阻力模型）和一组建模参数，即颗粒-颗粒恢复系数（e_p = 0.9），正常的颗粒-壁恢复系数（e_（ wn）= 0.1），并确定并验证了用于模拟DHFCDB立管中水动力行为的自由滑移边界条件（即切向颗粒壁恢复系数e_（WT）= 1.0）。

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