Influence of cycle time distribution on coating uniformity of particles in a spray fluidized bed by using CFD-DEM simulations |
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| Affiliation: | 1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. Heilongjiang Key Laboratory of New Energy Storage Materials and Processes, School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 50001, China;1. School of Chemistry, Monash University, 19 Rainforest Walk, Clayton, 3800, Australia;2. Rio Tinto, Bundoora Technical Development Centre, 1 Research Avenue, Bundoora, 3083, Australia;1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, China;2. Erosion/Corrosion Research Center, Department of Mechanical Engineering, The University of Tulsa, Oklahoma, United States;3. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao, China;1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China;2. Department of Chemical & Biochemical Engineering, Western University, London, Ontario, N6A 3K7, Canada;3. Institute of Shaoxing, Tianjin University, Zhejiang, 312300, China;1. Dalian National Laboratory for Clean Energy, National Engineering Laboratory for MTO, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China |
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| Abstract: | Cycle Time Distribution (CTD) plays a critical role for determining uniformity of particle coating in spray fluidized beds. However, the CTD is influenced by both geometrical structure and operating conditions of fluidized bed. In this study, a spray fluidized bed of coating process is simulated by a comprehensive Computational Fluid Dynamics-Discrete Element Model (CFD-DEM). To achieve different behaviors of CTD, some modifications are designed on a pseudo-2D internally circulating fluidized bed, which traditionally composes of a high-velocity upward bed and low-velocity downward bed. These modifications include making the air distributor slope and/or laying a baffle in the downward bed. First, the CTD and evolution of particle size distribution under different bed structures are compared. The CTD directly influences the coating uniformity. By making the particles flowing along a parallel direction in the downward bed through the geometrical modifications, the CTD becomes narrower and the coating uniformity is significantly improved. Second, under the optimized bed structure, the influence of operating conditions on the coating uniformity is studied. Properly increasing the fluidization gas velocity and the fluidization gas temperature and reducing the liquid spray rate can improve the coating uniformity. |
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| Keywords: | Spray fluidized bed Particle coating Cycle time distribution CFD-DEM |
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