Distribution of gas holdup in slurry bubble column reactor
Zhang Fengbo
Bu Yifeng
Xu Ming
Men Zhuowu
Abstract：In order to study distribution law of gas holdup in slurry bubble column reactor,the gas holdup in slurry bubble column reactor was studied under cold-state experiment with the aid of an air-liquid paraffin-alumina microspheres 3-phase system.The effects of superficial gas velocity and solid concentration on total gas holdup were investigated using differential pressure transmitter.The distribution of local gas holdup under different operating condition was also systematically elucidated by means of an optical fiber probe.Based on these experimental results,the design of an industrial slurry bubble column reactor was also proposed.Results show that total gas holdup increases with increasing of superficial gas velocity,while the addition of solid fine particles slightly decreases the total gas holdup.In the bottom area of the reactor,a significant effect of gas sparger on gas holdup distribution presents.Such effects partly decrease with the increasing of superficial gas velocity.In the middle and upper area of the reactor,the gas holdup shows higher in the middle,while lower at the edge distribution status along the radial direction,which means there is no obvious effect from the gas sparger in this area.For an industrial Fischer-Tropsch synthesis reactor,the filtration system should be better located at the area near the middle/upper reactor wall,with the operating superficial velocity higher than 0.12 m/s.
Keywords：slurry bubble column reactorsuperficial gas velocitytotal gas holduplocal gas holdup
Publication Date：2017-01-01