Abstract：Based on the method of radial division of flow field, liquid backmixing characteristics were investigated using pulse tracing technique in a bubble column of 50 cm in height and 550 cm in diameter. Air and water were used as the gas and liquid phases. The superficial gas velocity ranged from 3.0 to 8.6 cm/s, while the liquid velocity ranged from 0.30 to 1.00 cm/s. The experimental results showed that each residence time distribution curve demonstrated obvious long tail phenomenon, with the increase of the superficial liquid velocity, the long tail phenomenon was improved, which implied that the degree of liquid backmixing decreased, while the increase of the superficial gas velocity aggravated long tail phenomenon, but it was not as significant as the effect of superficial liquid velocity. By comparing with the hollow bubble column, the improvement of backmixing in the bubble column with radial division was increased by up to 22%. Finally, according to experimental results, the calculation formula for predicting the degree of liquid phase backmixing was obtained, most of the variances of the predicted model were within 5% of their experimental values.
ZHANG Jianpeng,JIN Zhichao,ZHAO Zhongjie et al. Effect of Radial Division of Flow Field on Backmixing of the Liquid Phase in a Bubble Column[J]. 化学反应工程与工艺, 2021, 37(2): 97-105.
