Hydrodynamics and bubble behaviour in a three-phase two-stage internal loop airlift reactor  

作　　者：Dan Li Kai Guo Jingnan Li Yiping Huang Junchao Zhou Hui Liu Chunjiang Liu 

机构地区：[1]School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China [2]State Key Laboratory of Chemical Engineering Tianjin University, Tianjin 300072, China [3]China Construction Industrial & Energy Engineering Co., Ltd., Nanjing210000, China

出　　处：《Chinese Journal of Chemical Engineering》2018年第6期1359-1369,共11页中国化学工程学报（英文版）

基　　金：Supported by the State Key Laboratory of Chemical Engineering(SKL-ChE-16B01);China Postdoctoral Science Foundation(2016M601263)

摘　　要：Local hydrodynamics of a gas–liquid–solid system,such as bubble circulation regime,gas holdup,liquid velocity and axial profile of solid concentration,are studied in a two-stage internal loop airlift reactor.Empirical correlations for gas holdup and liquid velocity are proposed to ease the reactor design and scale-up.Different bubble circulation regimes were displayed in the first(lower) and second(upper) stages.Increasing superficial gas velocity and solid loading can promote regime transition of the second stage,and the gas holdup of the second stage is higher than that of the lower stage.In addition,the effects of solid loading on bubble behaviour are experimentally investigated for each stage.It is found that bubble size in the downcomer decreases with the presence of solid particles,and bubble size distribution widens under higher superficial gas velocity and lower solid loading.Local hydrodynamics of a gas–liquid–solid system,such as bubble circulation regime,gas holdup,liquid velocity and axial profile of solid concentration,are studied in a two-stage internal loop airlift reactor.Empirical correlations for gas holdup and liquid velocity are proposed to ease the reactor design and scale-up.Different bubble circulation regimes were displayed in the first（lower） and second（upper） stages.Increasing superficial gas velocity and solid loading can promote regime transition of the second stage,and the gas holdup of the second stage is higher than that of the lower stage.In addition,the effects of solid loading on bubble behaviour are experimentally investigated for each stage.It is found that bubble size in the downcomer decreases with the presence of solid particles,and bubble size distribution widens under higher superficial gas velocity and lower solid loading.

关 键 词：Two-stage internal loop airlift reactor HYDRODYNAMICS BUBBLE Multiphase flow 

分 类 号：TQ021.1[化学工程]