Fluidization and bubbling behavior of potash particles in a deep fluidized bed |
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| Affiliation: | 1. Department of Chemical and Biological Engineering, University of Saskatchewan, SK, S7N 5A9, Saskatoon, Canada;2. The Mosaic Company, Belle Plaine, SK, Canada;3. Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, Canada;4. Department of Computer Science, University of Saskatchewan, Saskatoon, SK, Canada;1. School of Energy Science & Engineering, Harbin Institute of Technology, Harbin, China;2. Heilongjiang Key Laboratory of New Energy Storage Materials and Processes, School of Energy Science & Engineering, Harbin Institute of Technology, Harbin, China;1. Lattice Boltzmann Research Group, Karlsruhe Institute of Technology, Straße am Forum 8, Karlsruhe, 76131, Germany;2. Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology, Straße am Forum 8, Karlsruhe, 76131, Germany;3. Institute of Engineering Mechanics, Karlsruhe Institute of Technology, Kaiserstraße 10, Karlsruhe, 76131, Germany;4. Institute for Applied and Numerical Mathematics, Karlsruhe Institute of Technology, Englerstraße 2, Karlsruhe, 76131, Germany;1. Department of Chemical Engineering, Middle East Technical University, Ankara, Turkey;2. Department of Mechanical Engineering, Hacettepe University, Beytepe, Ankara, Turkey;1. Faculty of Mechanical and Precision Instrument Engineering, Xi''an University of Technology, Xi''an, 710048, China;2. Division of Artificial Systems Science, Graduate School of Engineering, Chiba University, Chiba, 2638522, Japan;1. Malaysian Palm Oil Board, 6, Persiaran Institusi, Bandar Baru Bangi, 43000, Selangor, Malaysia;2. Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Selangor, 43400, Malaysia;3. Department of Process and Food Technology, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Selangor, 43400, Malaysia |
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| Abstract: | Most existing models for predicting bubble size and bubble frequency have been developed for freely bubbling fluidized beds. Accurate prediction of bubbling behavior in deep fluidized beds, however, has been a challenge due to the higher degree of bubble coalescence and break up, high probability of the slugging regime, partial fluidization, and chaotic behavior in the bubbling regime. In this work, the bubbling and fluidization behavior of potash particles was investigated in a deep fluidized bed employing a twin-plane electrical capacitance tomography (ECT) system. Solid volume fraction, average bubble velocity, average bubble diameter, and bubble frequency in both bubbling and slugging regimes were measured at two different bed height ratios (H/D = 3.5 and H/D = 3.78). This work is the first to illustrate a sequential view of bubbles at different superficial gas velocities in a fluidized bed. The results show that both the bubble diameter and rising velocity increased with increasing the superficial gas velocity for the two bed heights, with larger values observed in the deeper bed compared to the shallower one. Predicted values for bubble diameter, bubble rise velocity and bubble frequency from different models are compared with the experimental data obtained from the ECT system in this work. Good agreement has been achieved between the values predicted by the previous models and the experimental data for the bubble diameter and bubble rise velocity with an average absolute deviation of 16% and 15% for the bed height of 49 cm and 13% and 8% for the bed height of 53 cm, respectively. |
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| Keywords: | Deep fluidized bed Potash particle Electrical capacitance tomography Image reconstruction Bubbling and slugging regime |
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