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过程工程学报 ›› 2022, Vol. 22 ›› Issue (7): 963-969.DOI: 10.12034/j.issn.1009-606X.221275

• 研究论文 • 上一篇    下一篇

同心圈式超重力旋转床液泛模型

姚文博1， 张仲君2， 刘承伟1， 李育敏1*， 计建炳1   

  1. 1. 浙江工业大学化学工程学院，浙江 杭州 310014 2. 杭州中美华东制药有限公司，浙江 杭州 310011
  • 收稿日期:2021-08-26 修回日期:2021-10-11 出版日期:2022-07-28 发布日期:2022-08-02
  • 通讯作者: 李育敏 liym@zjut.edu.cn

Flooding model of concentric-ring high gravity rotating bed

Wenbo YAO1,  Zhongjun ZHANG2,  Chengwei LIU1,  Yumin LI1*,  Jianbing JI1   

  1. 1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China 2. Hangzhou Zhongmei Huadong Pharmaceutical Co., Ltd., Hangzhou, Zhejiang 310011, China
  • Received:2021-08-26 Revised:2021-10-11 Online:2022-07-28 Published:2022-08-02
  • Contact: LI Yu-min liym@zjut.edu.cn

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摘要： 同心圈式超重力旋转床是一种新型超重力旋转床。液泛是超重力旋转床流体力学的重要特征。同心圈式超重力旋转床液体分布器和转子内缘之间的环形空间内的液滴被气体夹带，液滴受到离心力和气体曳力的作用，通过建立微分方程可获得液滴径向速度为零时的液滴运动径向距离。当该径向距离小于环形空间的径向距离，此时产生雾沫夹带液泛。由此建立同心圈式超重力旋转床雾沫夹带液泛模型。实验以空气和水为物系，测定了转子直径为1000 mm、高度为100 mm的同心圈式超重力旋转床在不同转速和表观液速下气体进口和出口之间的气相压降随表观气速的变化。气相压降随表观气速的增大先缓慢增大后快速增大。用表观气速对气相压降求导和目测旋转床中心气体出口处出现大量液体被气体夹带来确定液泛点气速。通过液泛点气速求得雾沫夹带液泛模型的系数k，并对该系数k进行关联。该雾沫夹带液泛模型的计算值和实验值吻合很好，平均偏差为3.1%。该模型优于Sherwood液泛模型，对同心圈式超重力旋转床的工业应用提供了必要的设计依据。

关键词: 同心圈式超重力旋转床, 液泛模型, 气相压降, 雾沫夹带

Abstract: Concentric-ring high gravity rotating bed is a new type of high gravity rotating bed. Liquid flooding is an important characteristic of hydrodynamics of high gravity rotating bed. The liquid droplets in the ring space between the liquid distributor and the inner edge of the rotor of the concentric-ring high gravity rotating bed are entrained by the gas. In terms of centrifugal force and drag force of gas that exerts the liquid droplets, a differential equation is established, from which a radial distance of the liquid droplets at radial velocity of the liquid droplets of zero is obtained. As the radial distance of the droplets at radial velocity of zero is less than that of the ring space, the entrainment flooding occurs. Thus, an entrainment flooding model of concentric-ring high gravity rotating bed was established. Experiments were carried out in a concentric-ring high gravity rotating bed with a rotor of 1000 mm diameter and 100 mm height using air-water system. Change of gas pressure drop between inlet and outlet of the concentric-ring high gravity rotating bed with superficial gas velocity was measured at various rotational speeds and superficial liquid velocities. The gas pressure drop increased slowly at first and then rapidly with increase of superficial gas velocity. The superficial gas velocity at flooding point was determined by both a derivation of gas pressure drop with apparent gas velocity and visual observation of a large amount of liquid entrained by gas at the gas outlet in the eye of the rotor. Thus, coefficient k of entrainment flooding model was obtained by the superficial gas velocity at flooding point and then coefficient k was correlated. Calculated values agreed well with experimental values, with an average deviation of 3.1%. The entrainment flooding model was superior to Sherwood's flooding model, and providing design basis for the industrial application of concentric-ring high gravity rotating bed.

Key words: concentric-ring high-gravity rotating bed, flooding model, gas pressure drop, entrainment