Hydrodynamics of a bubble-induced inverse fluidized bed reactor with a nanobubble tray  

作　　者：Yicheng Deng Keying Ma Yuanyuan Shao Jesse Zhu 

机构地区：[1]School of Chemical Engineering and Technology,Tianjin University,Tianjin,300072,China [2]Department of Chemical and Biochemical Engineering,The University of Western Ontario,London,Ontario,N6A 3K7,Canada [3]Institute of Shaoxing,Tianjin University,Zhejiang,312300,China

出　　处：《Particuology》2023年第2期8-16,共9页颗粒学报（英文版）

摘　　要：This paper reports on the hydrodynamics of a bubble-induced inverse fluidized bed reactor,using a nanobubble tray gas distributor,where solid particles are fluidized only by an upward gas flow.Increasing the gas velocity,the fixed layer of particles initially packed at the top of the liquid starts to move downwards,due to the rise of bubbles in this system,and then gradually expands downwards until fully suspended.The axial local pressure drops and standard deviation were examined to delineate the flow regime comprehensively under different superficial gas velocities.Four flow regimes(fixed bed regime,initial fluidization regime,expanded regime,and post-homogeneous regime)were observed and three transitional gas velocities(the initial fluidization velocity,minimum fluidization velocity,and homogeneous fluidization velocity)were identified to demarcate the flow regime.Three correlations were developed for the three transitional velocities.As the fine bubbles generated from the nanobubble tray gas distributor are well distributed in the entire column,the bed expansion process of the particles is relatively steady.

关 键 词：Bubble-induced Inverse fluidized bed Pressure drop Flow regime Bed expansion ratio Standard deviation 

分 类 号：O35[理学—流体力学]