Experimental and numerical study of pseudo-2D circulating fluidized beds |
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| Institution: | 1. Institute of Thermal Technology, Silesian University of Technology, Konarskiego 22, 44-100 Gliwice, Poland;2. VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 VTT, Finland;3. Amec Foster Wheeler, Staszica 31, 41-200 Sosnowiec, Poland;1. Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China;2. College of Energy, Xiamen University, Xiamen 361005, China;1. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China;2. Collaborative Innovation Center of Green Light-weight Materials and Processing, Hubei University of Technology, Wuhan 430068, China;3. School of Materials Science and Engineering, Hubei University of Technology, Wuhan 430068, China;4. School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China;1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China;1. Department of Chemical and Biological Engineering, University of British Columbia, Vancouver V6T 1Z3, Canada;2. Particulate Solid Research, Inc., Chicago, IL 60632, United States;3. Positron Imaging Centre, University of Birmingham, Birmingham B15 2TT, United Kingdom;4. Département de génie chimique, Ecole Polytechnique, Montréal, QC H3T 1J4, Canada;5. Department of Chemical and Process Engineering, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom |
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| Abstract: | We present experimental investigations and numerical simulations of a pseudo-2D riser. Experiments were performed for various airflow rates, particle types/diameters, and particle size distributions. Pressure distributions along the wall of the riser were measured. Additional measurements from a smaller pseudo-2D riser (Kallio et al., 2009; Shah et al., 2012) were used to analyze horizontal solids volume fraction profiles. The experimental data were compared with simulation results carried out using an Euler–Euler approach. A mesh sensitivity study was conducted for numerical simulations and effects associated with simplifying real 3D geometry to a 2D model were examined. In addition, the effect of using an algebraic equation to represent the granular temperature versus a full partial differential equation also was examined for numerical simulations. Results showed small but significant near-wall sensitivity of the flow variables to mesh size. Substantial differences in mean pressure, solids distribution, and solid velocities were obtained, when 2D and 3D simulation results were compared. Finally, applying the simplified granular temperature equation for turbulent fluidization and for dilute-phase transport can lead to incorrect predictions in models. |
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| Keywords: | Circulating fluidized bed Euler–Euler approach Gas–solid flow Kinetic theory of granular flow Particle size distribution 2D vs 3D |
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