文献类型：期刊文献

英文题名：Influence of Sparger Type on Mass Transfer in a Pilot-Scale Internal Loop Airlift Reactor

作者：Wang, Zongliang[1];Guo, Hongshan[2];Zhou, Tong[2];Cheng, Zhenmin[1];Huang, Zibin[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Sinopec Co, Dalian Res Inst Petr & Petrochem, Dalian 116045, Peoples R China

年份：2022

卷号：10

期号：2

外文期刊名：PROCESSES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000865606200001)】；

基金：This research was funded by National Key R&D Program of China (No. 2019YFC1906705). It was also funded by National Natural Science Foundation of China (22178113), China Petrochemical Corporation (120011) and China National Petroleum Corporation (PRIKY19022).

语种：英文

外文关键词：internal loop airlift reactor; mass transfer; sparger; gas holdup; liquid circulation velocity

摘要：In a pilot-scale internal loop airlift reactor with a height of 5.5 m and a main column diameter of 0.484 m, the influence of three gas sparger structures (ladder distributor, tri-nozzle sparger and perforated plate) on the volumetric mass transfer coefficient kLa was investigated. It was found that the perforated plate produces the highest gas holdup difference and circulating liquid velocity between the riser and the downcomer. The perforated plate provides the most efficient mass transfer due to the more uniform gas distribution and higher circulating liquid velocity, followed by the ladder distributor and tri-nozzle spargers. Compared with the tri-nozzle sparger, the perforated plate increases the value of kLa by up to 16% at a superficial velocity of 0.15 m/s. Interestingly, the analysis of the liquid-phase mass transfer coefficient kL and specific area a with respect to gas velocity shows that the mass transfer rate is primarily controlled by a. By comparing the predictions of different mass transfer models, the slip velocity model based on penetration theory yields a satisfactory agreement with the experimental results within similar to 15% error. Meanwhile, empirical correlations regarding gas holdup and kLa were developed and were found to have good consistency with experimental values.