Hydrodynamics of a bubble-induced inverse fluidized bed reactor with a nanobubble tray |
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| Institution: | 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China;2. Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, N6A 3K7, Canada;3. Institute of Shaoxing, Tianjin University, Zhejiang, 312300, China;1. Department of Medical Physics, Faculty of Physics, Institute of Physics, Jagiellonian University, Cracow, Poland;2. Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Collegium Medicum, Jagiellonian University, Cracow, Poland;3. Faculty of Chemistry, Jagiellonian University, Cracow, Poland;1. School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China;2. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China;3. School of Engineering, Newcastle University, NE1 7RU, United Kingdom;1. Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China;2. Zhuhai Institute of Modern Industrial Innovation, South China University of Technology, Zhuhai, 519175, China;3. School of Chemical Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, China;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;2. Particle Technology Research Centre, Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario N6A 3K7, Canada;3. Dalian National Laboratory for Clean Energy & National Engineering Laboratory for MTO, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;1. School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China;2. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, 454003, China |
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| Abstract: | This paper reports on the hydrodynamics of a bubble-induced inverse fluidized bed reactor, using a nanobubble tray gas distributor, where solid particles are fluidized only by an upward gas flow. Increasing the gas velocity, the fixed layer of particles initially packed at the top of the liquid starts to move downwards, due to the rise of bubbles in this system, and then gradually expands downwards until fully suspended. The axial local pressure drops and standard deviation were examined to delineate the flow regime comprehensively under different superficial gas velocities. Four flow regimes (fixed bed regime, initial fluidization regime, expanded regime, and post-homogeneous regime) were observed and three transitional gas velocities (the initial fluidization velocity, minimum fluidization velocity, and homogeneous fluidization velocity) were identified to demarcate the flow regime. Three correlations were developed for the three transitional velocities. As the fine bubbles generated from the nanobubble tray gas distributor are well distributed in the entire column, the bed expansion process of the particles is relatively steady. |
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| Keywords: | Bubble-induced Inverse fluidized bed Pressure drop Flow regime Bed expansion ratio Standard deviation |
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