Gas back-mixing study in a membrane-assisted micro-structured fluidized bed
Gas back-mixing study in a membrane-assisted micro-structured fluidized bed
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DOI：
10.1016/j.ces.2014.01.013
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发表时间：
2014-04
影响因子：
4.7
通讯作者：
T. Dang;F. Gallucci;V. S. Annaland
中科院分区：
文献类型：
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作者：
T. Dang;F. Gallucci;V. S. Annaland
膜辅助微结构流化床已被提出作为有效的膜反应器，特别是用于氢气生产。然而，非常少的信息是可用的气体渗透通过膜上的气体返混和传质速率在这种类型的反应器的影响。本研究仔细研究了气体返混特性在微流化床和气体渗透（添加和提取）通过安装在左右壁限制流化床的平板膜的影响。示踪气体注入（刺激响应）方法已被用于粒子图像测速和数字图像分析技术相结合的固体通量分布，强烈影响气体返混的其他有见地的信息。本研究的结果表明，流化床的微结构导致减少的气体返混，从而在一个更有效的膜反应器配置的氢气生产，因为增加了气体渗透的驱动力。研究结果也为微结构流化床膜反应器的设计提供了一定的指导。
Membrane-assisted micro-structured fluidized beds have been proposed as efficient membrane reactors and in particular for hydrogen production. However, very little information is available on the effects of gas permeation through the membrane on the gas back-mixing and mass transfer rates in this type of reactors. This study carefully investigates the gas back-mixing characteristics in a micro-fluidized bed and the influence of gas permeation (both addition and extraction) through flat membranes installed in the left and right walls confining the fluidized bed. The tracer gas injection (stimulus-response) method has been used combined with Particle Image Velocimetry and Digital Image Analysis techniques for additional insightful information on the solids flux profiles that strongly influence the gas back-mixing. The results of this study demonstrate that micro-structuring of the fluidized bed results in reduced gas back-mixing and thus in a more efficient membrane reactor configuration for hydrogen production because of the increased driving force for gas permeation. The results also provide some guidelines for the design of micro-structured fluidized bed membrane reactors in terms of preferred specific membrane area and particle size.