液固磁稳定床中固含率分布与液相返混特性

摘要固含率分布和液相返混系数是液固磁稳定反应器放大与优化所必需的基础数据。采用床层膨胀高度法、光电法及瞬态点源示踪技术,研究了以SRNA-4催化剂为固相的液固磁稳定床中固含率分布和液相返混特性。试验结果表明,固含率轴向分布基本均匀,径向为“扁-陡曲线”分布。固含率随磁场强度和颗粒尺寸的增大而增大,随液体粘度和空塔液速的增大而减小。轴向液相返混系数随磁场强度和液体粘度的增大而减小,随空塔液速和颗粒尺寸的增大而增大。回归得到了固含率和轴向普朗特准数的关联式,预测值与试验值吻合良好

	Service

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	Email Alert
	RSS
	作者相关文章
	李韡
	张晓尘
	张金利
	李晓芳
	卢立祥

关键词：磁稳定床返混固含率

Abstract： Solids holdup distribution and liquid backmixing coefficients are fundamental to the scale-up design and optimization of liquid-solid magnetically stabilized reactors.In this article,local solid holdup distribution and liquid backmixing coefficients were analyzed using the bed height-expanded method,the photoelectric method and the transient point source tracer pulse input technique for the liquid-solid magnetically stabilized bed taking the ferromagnetic amorphous alloy catalysts of SRNA-4 as the solid phase.The experimental results showed that the local solid holdup appeared a uniformly axial distribution and a "flat-steep curve" of radial distribution.The solid holdup increased at higher magnetic intensity as well as under larger particle sizes,but decreased at lower liquid viscosity and slower superficial liquid velocity.Axial liquid backmixing coefficients weakened at higher magnetic intensity and liquid viscosity,but enhanced at higher superficial liquid velocity and larger particle size.Based on the experimental data,the equation was established to estimate accurately the axial liquid backmixing Peclet number using physical properties and operating conditions in the magnetically stabilized bed.The experimental results showed they were in accordance with the prediction.

Keywords：

Received 2006-07-15; published 2006-07-15

引用本文:

李韡;张晓尘;张金利;李晓芳;卢立祥;.液固磁稳定床中固含率分布与液相返混特性[J]. 化学工业与工程, 2006,23(4): 283-286

LI Wei,ZHANG Xiao-chen,ZHANG Jin-li,LI Xiao-fang,LU Li-xiang.Solid Holdup and Liquid Backmixing of Liquid-SRNA-4 Catalysts in Magnetically Stabilized Beds[J]. Chemcial Industry and Engineering, 2006,23(4): 283-286