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    赵钟杰, 张建鹏, 唐艳玲, 肖桐, 黄子宾, 程振民. 基于CFD-DEM的固液分级过滤模拟[J]. 华东理工大学学报(自然科学版), 2022, 48(5): 591-599. DOI: 10.14135/j.cnki.1006-3080.20210506010
    引用本文: 赵钟杰, 张建鹏, 唐艳玲, 肖桐, 黄子宾, 程振民. 基于CFD-DEM的固液分级过滤模拟[J]. 华东理工大学学报(自然科学版), 2022, 48(5): 591-599. DOI: 10.14135/j.cnki.1006-3080.20210506010
    ZHAO Zhongjie, ZHANG Jianpeng, TANG Yanling, XIAO Tong, HUANG Zibin, CHENG Zhenmin. Simulation of Solid-Liquid Cascade Filtration Based on CFD-DEM[J]. Journal of East China University of Science and Technology, 2022, 48(5): 591-599. DOI: 10.14135/j.cnki.1006-3080.20210506010
    Citation: ZHAO Zhongjie, ZHANG Jianpeng, TANG Yanling, XIAO Tong, HUANG Zibin, CHENG Zhenmin. Simulation of Solid-Liquid Cascade Filtration Based on CFD-DEM[J]. Journal of East China University of Science and Technology, 2022, 48(5): 591-599. DOI: 10.14135/j.cnki.1006-3080.20210506010

    基于CFD-DEM的固液分级过滤模拟

    Simulation of Solid-Liquid Cascade Filtration Based on CFD-DEM

    • 摘要: 采用计算流体力学(CFD)和离散单元法(DEM)耦合的方法,在不同滤层结构的三维随机堆积颗粒层过滤器内进行固液分级过滤的数值模拟研究。实验结果表明,过滤效率的模拟计算值与实验值吻合良好,压降值的偏差在Ergun方程允许误差范围内。过滤器的容垢能力用计算模型的颗粒沉积均匀度表示,并拟合得到沉积均匀度的关联式。颗粒沉积分布的模拟结果显示:单层细滤料过滤器的颗粒沉积主要发生在近入口处,容垢能力较低;分级过滤器的细滤料层保证了高过滤效率,粗滤料层则提供了较大的容垢能力。

       

      Abstract: The three-dimensional model for a randomly packed bed filter was established by the combination of computational fluid dynamics (CFD) and discrete element method (DEM). To obtain more reliable simulation results, the liquid-solid, particle-granule and particle-particle interactions were all taken into consideration. The filtration performances of the system including filtration efficiency, pressure drop and impurity holding capacity were systematically analyzed, and the particle deposition distribution and morphology were quantitatively studied. The simulated results of filtration efficiency agreed well with those obtained from experimental operations. The deviation of the pressure drop fell in the allowable error range of the Ergun equation. The impurity holding capacity could be represented by the deposition uniformity obtained by simulation, which increased with superficial velocity. Correlation of deposition uniformity for granular bed filters was also simulated with a good prediction accuracy. The results show that cascade filtration has both a high filtration efficiency and a low pressure drop by combining deep bed filtration and surface filtration. The quality factor of the cascade filters is greater than those with single-layer filters. Simulation of particle deposition morphology and distribution suggests that the particles mainly deposit on the surface of single-layer filter packed with fine granules, resulting in a small holding capacity. As for the cascade filter, the fine and coarse granular layer produces a high filtration efficiency and large impurity holding capacity, respectively

       

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