Effect of design parameters on system mixing for a micro fluidized bed reactor using computational fluid dynamics simula
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ORIGINAL PAPER
Effect of design parameters on system mixing for a micro fluidized bed reactor using computational fluid dynamics simulation Ratchanon Piemjaiswang1 · Jaruwan Charoenchaipet2 · Thapanee Saelau2 · Pornpote Piumsomboon2,3 · Benjapon Chalermsinsuwan2,3,4 Received: 19 October 2019 / Revised: 21 January 2020 / Accepted: 16 May 2020 © Associação Brasileira de Engenharia Química 2020
Abstract Nowadays, conventional multiphase flow reactors have many operational problems, non-uniform distribution of gas–solid particles and low heat and mass transfers. To overcome these operation problems, this study proposes the use of a micro fluidized bed reactor, verifying its feasibility with a computational fluid dynamics (CFD) simulation. The other advantages of the micro fluidized bed reactor are increased surface area and easy scale-up. However, the literature data about the CFD simulation of micro fluidized bed reactors and the effects of parameters on system mixing inside this reactor are still limited. This study objective is thus to develop the CFD simulation of a micro fluidized bed reactor and to explore the effect of design parameters on system mixing using statistical design and analysis of experimental methodology. The design parameters consist of the diameter of the reactor, percent inlet opening area and height of the reactor. The suitable system mixing will have a positive effect on heat and mass transfer rates, as well as the chemical reaction rate. The results reveal that a micro fluidized bed reactor with diameter of 5 mm, percent inlet opening area of 100% and reactor height of 6 mm gives the best uniform distribution of gas–solid particles. Keywords Computational fluid dynamics · Design parameter · Micro fluidized bed reactor · Mixing · Simulation
Introduction Nowadays, fluidized bed reactors are widely applied in many chemical and petrochemical industries because they can be used in various processes such as polymerization, fluid catalytic cracking, hydrocarbon isomerization and dying processes. In the fluidized bed reactor, the solids are
* Benjapon Chalermsinsuwan [email protected] 1
Environmental Research Institute, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
2
Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
3
Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
4
Advanced Computational Fluid Dynamics Research Unit, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
converted from a static-like state to a dynamic-like state by passing a gas up through the solids. An increment of gas velocity creates the shifting of system hydrodynamics or solid particle movement characteristics called gas–solid fluidization regimes. Although the fluidized bed reactor is popularly used, it still has many hydrod
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