Gas permeation effect on the Two-Section Two-Zone Fluidized Bed Membrane Reactor (TS-TZFBMR) fluid dynamics: A CFD simulation study

被引：9
作者：
Julian, I. [1 ]
Herguido, J. [1 ]
Menendez, M. [1 ]
机构：
[1] Univ Zaragoza, Aragon Inst Engn Res I3A, Catalysis Mol Separat & Reactor Engn Grp CREG, Mariano Esquillor S-N, Zaragoza 50018, Spain
来源：
CHEMICAL ENGINEERING JOURNAL | 2016年 / 305卷
关键词：
Two-Fluid Model; Membrane reactor; Two-Zone Fluidized Bed Reactor; Fluid dynamics; Gas permeation; 2-FLUID MODEL; NUMERICAL-SIMULATION; BOUNDARY-CONDITIONS; METHANE; BUBBLE; DEHYDROGENATION; VALIDATION; FLOW;
D O I：
10.1016/j.cej.2015.08.127
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Two-Fluid Model simulations were conducted using the commercial software Ansys CFX and Fluent to study the effect of the gas extraction on the fluid dynamic behavior of a membrane-assisted Two-Section Two-Zone Fluidized Bed Membrane Reactor (TS-TZFBMR). Simulated bubble properties and bed dynamics were analyzed and compared among different membrane reactor configurations, including reactor-wall (RWM) and immersed tubular (ITM) membranes, for their future use in catalytic reactions, e.g., alkane dehydrogenation or methane steam reforming. According to the solids hold-up distribution at different fluidization regimes and permeation fluxes, the ITM configuration is the most suitable to enhance the gas-particle contact and to favor the solids axial mixing for in situ catalyst regeneration purposes. However, the RWM configuration provides a greater permeation area for selective gas removal and is preferred to enhance purification. It was found that relative permeation fluxes above 20% of the total feed gas have a significant impact on the fluid dynamic regime within the TS-TZFBMR, concerning the appearance of local defluidized regions, gas channeling and solids axial mixing. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：201 / 211
页数：11
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