Hydrodynamics and mass transfer characteristics of a three-stage internal loop airlift reactor

doi:10.16085/j.issn.1000-6613.2023-1269

Abstract

Abstract:

The hydrodynamics and mass transfer characteristics of a three-stage internal loop airlift reactor were investigated experimentally. The gas hold-up, mixing time, residence time, and volumetric mass transfer coefficient were measured in the cold mode experiment under different superficial gas velocities (0.015—0.1m/s) and internals. Experimental results showed that as the superficial gas velocity increased, the gas hold-up increased, mixing time decreased, and mean residence time decreased. Meanwhile, the volumetric mass transfer coefficient increased as the superficial gas velocity increased. The effect of internals on the reactor performance was discussed based on the flow pattern observation. It was found that the mixing effect of the reactor was better when the diameter of the upper cross-section of the internal is relative large (3^# internal), whereas the reactor inhibited the liquid backmixing effectively when the upper cross-section of the internal was relative small (1^# internal).

Key words: multistage airlift loop reactor, multiphase flow, interstage internals, hydrodynamics, gas-liquid mass transfer

摘要：

针对级间安装导流筒的三级环流反应器的气液流动与传质过程开展实验研究。通过冷模实验获得不同表观气速下（0.015~0.1m/s）以及安装不同级间内构件时环流反应器内的气含率、混合时间、停留时间以及体积氧传质系数。结果表明，随着表观气速的增加，反应器各级内的气含率增加，混合时间减少，平均停留时间减小，同时氧传质系数增加。通过对反应器内气液流型的变化的观察，进一步分析了级间内构件对三级环流反应器性能的影响，发现内构件上截面较宽时（3^#内构件），反应器的混合效果更好，而内构件的上截面较小时（1^#内构件），反应器可以更好地抑制返混。

关键词: 多级气升式环流反应器, 多相流, 级间内构件, 流体动力学, 气液传质

CLC Number:

TQ021.1

HUANG Yiping, LI Ting, ZHENG Longyun, QI Ao, CHEN Zhenglin, SHI Tianhao, ZHANG Xinyu, GUO Kai, HU Meng, NI Zeyu, LIU Hui, XIA Miao, ZHU Kai, LIU Chunjiang. Hydrodynamics and mass transfer characteristics of a three-stage internal loop airlift reactor[J]. Chemical Industry and Engineering Progress, 2023, 42(S1): 175-188.

黄益平, 李婷, 郑龙云, 戚傲, 陈政霖, 史天昊, 张新宇, 郭凯, 胡猛, 倪泽雨, 刘辉, 夏苗, 主凯, 刘春江. 三级环流反应器中气液流动与传质规律[J]. 化工进展, 2023, 42(S1): 175-188.

Figures/Tables 14

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表观气速 /m·s^-1	安装1^#内构件时的混合时间/ s	安装2^#内构件时的混合时间/ s	安装3^#内构件时的混合时间/ s
0.015	137.5	49	32.5
0.029	114.5	39.5	27
0.042	112	36	32.5
0.057	105	46	32.5
0.07	101.5	28	34.5
0.1	80	24	21

表观气速 /m·s^-1	安装1^#内构件时的混合时间/ s	安装2^#内构件时的混合时间/ s	安装3^#内构件时的混合时间/ s
0.015	137.5	49	32.5
0.029	114.5	39.5	27
0.042	112	36	32.5
0.057	105	46	32.5
0.07	101.5	28	34.5
0.1	80	24	21

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