多级搅拌塔气液体系的轴向混合和气含率  

Axial Mixing and Gas Hold-Up of Gas-Liquid in Multistage Agitated Column

作　　者：崔巍[1] 朱家文[1] 杨志东[1] 武斌[1] 陈葵[1] 纪利俊[1] 

机构地区：[1]华东理工大学化学工程研究所,上海200237

出　　处：《化学反应工程与工艺》2009年第2期116-120,共5页Chemical Reaction Engineering and Technology

摘　　要：采用改进的Rushton六直叶涡轮桨,在内径为80 mm的多级搅拌塔中,以氮气-水体系为研究对象,考察了液速、气速和搅拌桨转速对连续相轴向混合和气含率的影响。结果表明:在液速1.38×10^(-4)～4.42×10^(-4)m/s、气速5.53×10^(-2)～17.68×10^(-2) m/s和转速1.67～13.33 r/s条件下,轴向扩散系数随着液速和气速的增加而增大,随着搅拌桨转速的增加先减小后增大;平均气含率随着液速、气速及搅拌桨转速的增加而增大。根据实验数据得到了连续相轴向扩散系数和平均气含率的关联式,其计算值与实验值误差较小,分别小于15%和10%。The axial mixing and gas hold-up of nitrogen-water system in a multistage agitated column with inside diameter 80 mm were studied. The effects of liquid velocity, gas velocity and stirring speed on axial mixing and gas hold-up were investigated. Under the experimental conditions of liquid velocity 1.38×10^-4 --4.42 ×10^-4 m/s, gas velocity 5.53×10^-2 --17.68×10^-2 m/s and stirring speed 1.67- 13. 33 r/s, the results showed that the axial diffusion coefficient increased with the increase of liquid velocity and gas velocity, and first increased then decreased with the increase of the stirring speed while the gas hold-up increased with the increse of stirring speed, liquid velocity and gas velocity increased. Empirical correlations describing axial diffusion coefficient of continuous phase and gas hold-up in the column were obtained from the experimental data and the errors experimental values of the caculated values of the axial diffusion coefficient and gas hold-up were less than 15% and 10 %, respectively.

关 键 词：多级搅拌塔 轴向返混 气含率 轴向扩散系数 

分 类 号：TQ027.32[化学工程]