Effects of internals on phase holdup and backmixing in a slightlyexpanded-bed reactor with gas-liquid concurrent upflow |
| |
Authors: | Kang Yu Weijie Wang Tao Zhang Yumei Yong Chao Yang |
| |
Affiliation: | CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;PetroChina Petrochemical Research Institute, Beijing 102206, China;CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China |
| |
Abstract: | Five different internals were designed, and their effects on phase holdup and backmixing were investigated in a gas-liquid concurrent upflow reactor where the spherical alumina packing particles of three diameters (3.0, 4.5 and 6.0 mm) were slightly expanded under the conditions of varied superficial gas velocities (6.77×10-2-3.61×10-1 m·s-1) and superficial liquid velocities (9.47×10-4-2.17×10-3 m·s-1). The experimental results show that the gas holdup increases with the superficial gas velocity and particle size, opposite to the variational trend of liquid holdup. When an internal component is installed amid the upflow reactor, a higher gas holdup, a less liquid holdup and a larger Peclet number characterizing the weaker backmixing are obtained compared to those in the bed without internals under the same operating conditions. Additionally, the minimal backmixing is observed in the reactor equipped with the internals with a novel multi-step design. Finally, empirical correlations were proposed for estimating gas holdup, liquid holdup and Peclet number with the relative deviations within 11%, 12% and 25%, respectively. |
| |
Keywords: | Internals Phase holdup Backmixing Slightly-expanded-bed reactor Multiphase flow Hydrodynamics |
本文献已被 万方数据 ScienceDirect 等数据库收录! |
| 点击此处可从《中国化学工程学报》浏览原始摘要信息 |
|
点击此处可从《中国化学工程学报》下载全文 |
|