Influence of impeller diameter on overall gas dispersion properties in a sparged multi-impeller stirred tank

被引:27
作者
Bao, Yuyun [1 ]
Wang, Bingjie [1 ]
Lin, Mingli [1 ]
Gao, Zhengming [1 ]
Yang, Jie [1 ]
机构
[1] Beijing Univ Chem Technol, Sch Chem Engn, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
基金
中国国家自然科学基金;
关键词
Gas holdup; Mixing; Multiphase reactors; Relative power demand; CFD; Multi-impeller stirred tank; LIQUID FLOW; NUMERICAL-SIMULATION; SOLID SUSPENSION; TEMPERATURE; REACTOR; TURBINE; VESSEL; MODEL;
D O I
10.1016/j.cjche.2014.11.030
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The impeller configuration with a six parabolic blade disk turbine below two down-pumping hydrofoil propellers, identified as PDT + 2CBY, was used in this study. The effect of the impeller diameter D, ranging from 0.30T to 0.40T (T as the tank diameter), on gas dispersion in a stirred tank of 0.48 m diameter was investigated by experimental and CFD simulation methods. Power consumption and total gas holdup were measured for the same impeller configuration PDT + 2CBY with four different D/T. Results show that with D/T increases from 0.30 to 0.40, the relative power demand (RPD) in a gas-liquid system decreases slightly. At low superficial gas velocity VS of 0.0078 m . s(-1), the gas holdup increases evidently with the increase of D/T. However, at high superficial gas velocity, the system with D/T - 0.33 gets a good balance between the gas recirculation and liquid shearing rate, which resulted in the highest gas holdup among four different D/T. CFD simulation based on the two-fluid model along with the Population Balance Model (PBM) was used to investigate the effect of impeller diameter on the gas dispersion. The power consumption and total gas holdup predicted by CFD simulation were in reasonable agreement with the experimental data. (C) 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.
引用
收藏
页码:890 / 896
页数:7
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