CFD-DEM investigation into flow characteristics in mixed pulsed fluidized bed under electrostatic effects |
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| Institution: | 1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Institute of Marine Equipment, Shanghai Jiao Tong University, Shanghai 200240, China;3. CHEC Dredging Co., Ltd., Shanghai 200136, China;4. National Engineering Research Center of Dredging, Shanghai 200120, China;1. Civil and Environmental Engineering Faculty, Amirkabir University of Technology, Tehran, Iran;2. Civil Engineering Faculty, Science and Research Branch, Islamic Azad University, Tehran, Iran;1. European Powder and Process Technology, Longfellow Drive, Kettering, United Kingdom;2. KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, 2860 Sint-Katelijne-Waver, Belgium;3. Beijing University of Chemical Technology, Beijing Advanced Centre of Smart Matter Science and Engineering, Beijing, China;1. Department of Chemical Engineering, Hamedan University of Technology, Hamedan, P.O. Box 65155-579, Iran;2. Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699-5725, USA;3. Department of Chemical Engineering, Ilam University, Ilam 69315-516, Iran;1. Ghent University, Laboratory for Chemical Technology, Technologiepark 125, 9052 Gent, Belgium;2. University College London, Centre for Nature-Inspired Engineering and Department of Chemical Engineering, Torrington Place, WC1E 7JE London, UK |
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| Abstract: | Static electricity has an important effect on gas–solid fluidized bed reactor fluidization performance. In the process of fluidization, electrostatic interaction between particles will obviously accelerate particle agglomerate formation, which consequently reduces the fluidization performance. Pulsed gas flow injection is an efficient method to enhance particle mixing, thereby weakening the occurrence of particle agglomerate. In this study, the two-dimensional hybrid pulsed fluidized bed is established. The flow characteristics are studied by using the coupled CFD-DEM numerical simulation model considering electrostatic effects. Influences of different pulsed frequencies and gas flow ratios on fluidized bed fluidization performance are investigated to obtain the optimal pulsed gas flow condition. Results show that in the presence of static electricity, the bubble generation position is lower, which is conducive to the particle flow. Pulsed gas flow can increase the particle velocity and improve the diffusion ability. The bubble generation time is different at different frequencies, and the frequency of 2.5 Hz has the most obvious effect on the flow characteristics. Different gas flow ratios have significant impacts on the particle movement amplitude. When the pulse gas flow accounts for a large ratio, the particle agglomerate tends to be larger. Therefore, in order to improve the fluidization effect, the ratio of pulsed gas flow to stable gas flow should be appropriately reduced to 0.5 or less. |
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| Keywords: | Mixed pulsed fluidized bed CFD-DEM Electrostatic effects Flow characteristics |
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