New measurements on hydrodynamics in a gas-liquid-solid expanded bed  

作　　者：Xiuhong Zhou Yongli Ma Mingyan Liu Yixian Zhu Jiaming Zhang 

机构地区：[1]School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China [2]State Key Laboratory of Chemical Engineering,Tianjin University,Tianjin 300350,China [3]China Energy Longyuan Environmental Protection Co.,Ltd.,Beijing 100039,China

出　　处：《Particuology》2021年第5期276-284,共9页颗粒学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.91834303,22008169);the Open Research Fund of State Key Laboratory of Multiphase Complex Systems(No.MPCS-2019-D-11).

摘　　要：The solid holdup,in a 150 mm-ID×2460 mm-height gas-liquid-solid expanded bed with air,water and glass beads(the diameter of particles is 0.6-0.8 mm)was firstly investigated based on the immersion-type online multiphase measuring instrument,and bubble behavior was studied via the BVW-2 double electrical conductivity probe.The effect of the superficial gas velocity and liquid velocity on the expanded ratio,the transition ratio,the bubble rising velocity,the gas holdup and the solid holdup was studied.It is discovered that compared with the gas velocity,the liquid velocity has stronger impact on the expanded ratio,but it is opposite for the transition ratio.The average gas holdup and solid holdup increase linearly as the superficial gas velocity goes up.Among it,the gas holdup increases greater in the center,while the solid holdup increases greater near the wall.Compared with it,when the superficial liquid velocity rises,the average gas holdup hardly changes,but the average solid holdup keeps decreasing,especially the solid holdup distributes flatter with the increase of the superficial liquid velocity.

关 键 词：Phase holdup Gas-liquid-solid expanded bed Immersion-type online multiphase measuring instrument BVW-2 double electrical conductivity probe 

分 类 号：O35[理学—流体力学]