文献类型：期刊文献

英文题名：External Wetting Efficiency in a Three-Phase Fixed Bed Loaded with Porous and Non-Porous Packings

作者：Cheng, Zhenmin[1];Luo, Gang[1];Tang, Yanling[1];Ling, Dan[1];Chen, Zhaoxuan[1];Liu, Peng[1];Zhang, Bo[2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Fudan Univ, Dept Macromol Sci, State Key Lab Mol Engn Polymers, Shanghai 200438, Peoples R China

年份：2022

卷号：10

期号：1

外文期刊名：PROCESSES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000760458500001)】；

基金：FundingThe authors are grateful to the financial support from the National Key R&D Program of China (No. 2019YFC1906705) and the National Natural Science Foundation of China (No. 21676085).

语种：英文

外文关键词：trickle bed; liquid flow texture; alumina pellets; glass pellets; liquid-solid wetting efficiency

摘要：Films and rivulets are the two basic forms of dynamic liquid in a three-phase fixed bed (trickle bed), which determines the wetting efficiency of the catalyst. This paper is devoted to the conflicting wetting performance observed between non-porous glass beads and less wettable porous alumina, and a parallel zone model is applied to resolve the complex liquid flow texture. It shows in both cases of glass beads and aluminium pellets, the pressure drop, film flow and rivulet flow fractions all display pronounced multiplicities along with the liquid flow rates in increasing and decreasing branches, although the rivulet flow fraction is reduced to 0 in the liquid decreasing branch started from pulsing flow in both cases. Different from the glass beads, there is almost no wetting efficiency difference for the alumina pellets with respect to liquid flow rate increasing or decreasing, which is in agreement with the dynamic liquid holdup measurements. The liquid is significantly more uniformly distributed over the crosssection in the Al2O3 bed since rivulet flow is much reduced than in the case of glass beads.