Effects of initial static bed height on fractional conversion and bed pressure drop in tapered-in and tapered-out fluidized bed reactors |
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| Institution: | 1. Dept. of Mechanical Power Engineering and Energy, Elminia University, Main Road – Shalaby Land – Menia, Minya 11432, Egypt;2. Dept. of Mechanical Design Eng., College of Engineering, Chonbuk National University, 567 Baekjedaero, Duckjin-gu, Jeonju 54896, Republic of Korea;1. Innovation Center of the Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia;2. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia;1. Department of Civil Engineering, Lassonde School of Engineering, York University, Toronto, Ontario, Canada M3J 1P3;2. Department of Civil and Environmental Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9;3. Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9;1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100190, PR China;2. University of Chinese Academy of Science, Beijing 100049, PR China;1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100190, PR China;2. Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, PR China;3. University of Chinese Academy of Sciences, Beijing 100049, PR China;4. BOE Technology Group Co. Ltd., Beijing 100016, PR China |
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| Abstract: | In this article, a standard 2D Two-Fluid Model (TFM) closed by the kinetic theory of granular flow (KTGF) has been applied to simulate the behavior of tapered-in and tapered-out fluidized bed reactors. In this regard, two types of chemical reactions with gas volume reduction and increase were considered to investigate the effects of initial static bed height on the fractional conversion and bed pressure drop. To validate the CFD model predictions, the results of hydrodynamic simulations concerning bed pressure drop and bed expansion ratio were compared against experimental data reported in the literature and excellent agreement was observed. The obtained simulation results clearly indicate that there is an appropriate static bed height in a tapered-in reactor in which the fractional conversion becomes maximum at this height; whereas variations of static bed height in a tapered-out reactor have insignificant influences on the fractional conversion. Moreover, it was found that the residence time, temperature, and intensity of turbulence of the gas phase are three important factors affecting the fractional conversion in tapered fluidized bed reactors. In addition, it was observed that increasing the static bed height increases the bed pressure drop for both the tapered-in and tapered-out fluidized bed reactors. |
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