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›› 2006, Vol. 6 ›› Issue (5): 703-707.

• 流动与传递 • 上一篇    下一篇

膨胀床中QMA Spherosil LS介质粒径分布

周小平,史清洪,孙彦   

  1. 天津大学化工学院生物化工系
  • 出版日期:2006-10-20 发布日期:2006-10-20

Hydrodynamic Characteristics of QMA Spherosil LS in an Expanded Bed

ZHOU Xiao-ping,SHI Qing-hong,SUN Yan   

  1. Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University
  • Online:2006-10-20 Published:2006-10-20

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摘要： 对新型的膨胀床吸附介质QMA Spherosil LS在膨胀床内的流体力学性能和粒径分布行为进行了详细的研究. 在实验过程中，通过侧壁设有多个取样口的自制膨胀床装置在线采集床层内部的固液混合物样品，考察了介质填充高度、流速及料液性质对轴向粒径分布的影响. 研究结果表明，膨胀床内QMA Spherosil LS介质的流体力学行为可用Richardson-Zaki方程很好地描述. 在膨胀床中QMA Spherosil LS介质的平均粒径沿轴向存在着明显的变化，但介质密度无明显的改变；这种粒径的轴向分布情况受床层的填充高度和流动相速度的影响. 在忽略细胞与介质相互作用的条件下，3%酵母细胞悬浮液对阴离子交换吸附剂QMA Spherosil LS的粒径分级的影响十分有限.

关键词: 膨胀床, 粒径分布, 空隙率

Abstract: The bed expansion and size distribution of ion-exchanger, QMA Spherosil LS, were extensively investigated in a glass column (26 mm I.D.) modified by side ports, and the influences of packed bed height, flow velocity and nature of feedstock were discussed. The results suggested that the characteristics of bed expansion could be well described by Richardson-Zaki Equation. The QMA Spherosil LS had a significant size distribution along the axial direction of column, but a relative uniform density. The classification was changed with the packed bed height and flow velocity. Regardless of the interaction between yeast cell and adsorbent, the classification of the adsorbents varied little in the transition from aqueous buffer to biomass containing feedstock.

Key words: expanded bed, particle size distribution, bed voidage