Gas dispersion and solid suspension in a three-phase stirred tank with triple impellers  

作　　者：Hanbin Wang Zhengming Gao Bingjie Wang Yuyun Bao Ziqi Cai 

机构地区：[1]State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Chinese Journal of Chemical Engineering》2020年第5期1195-1202,共8页中国化学工程学报（英文版）

基　　金：the financial support from the National Key R&D Program of China(2017YFB0306703);the Fundamental Research Funds for the Central Universities(XK1802-1);the National Natural Science Foundation of China(No.21676007)。

摘　　要：The hydrodynamics is still not fully understood in the three-phase stirred tank equipped with multi-impeller due to the intensive interaction between phases.In this work,the solid critical suspension speed(NJSG),relative power demand(RPD)and overall gas holdup(ε_G)were measured in an air–water–glass beads stirred tank equipped with multi-impeller,which consists of a parabolic blade disk turbine below two down-pumping hydrofoils.Results show that either the NJSGor the specific power consumption increases when increasing the volumetric solid concentration or superficial gas velocity.RPD changes less than 10%when solid volumetric concentration ranges from 0 to 15%.ε_G decreases with the increase of solid concentration,and increases with the increase of both superficial gas velocity and the total specific power consumption.The quantitative correlations of NJSG,RPD andεGwere regressed as the function of superficial gas velocity,specific power consumption,Froude number and gas flow number,in order to provide the reference in the design of such three-phase stirred tank with similar multi-impellers.

关 键 词：Solid suspension Gas holdup Gas-liquid-solid system Stirred reactor 

分 类 号：TQ051.72[化学工程]