Forming and breaking the ceiling of inlet gas velocity regarding to separation efficiency of cyclone |
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| Institution: | 1. College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, 030024, China;2. Avic Xinxiang Aviation Industry (Group) Co, Ltd, Xinxiang, 453002, China;3. School of Chemistry and Chemical Engineering, North University of China, Taiyuan, 030051, China;1. School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212000, China;2. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212000, China;1. Department of Epidemiology and Environmental Health, School of Public and Health Professions, University at Buffalo, Buffalo, 14214, USA;2. Department of Earth Science and Geography, California State University, Dominguez Hills, Carson, 90747, USA;3. Department of Environmental Science, Baylor University, Waco, 76798, USA;1. College of Information and Electrical Engineering, China Agricultural University, Beijing, 100083, China;2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100190, China;1. State Key Laboratory of Multi-phase Complex Systems, Institute of Processing Engineering, Chinese Academy of Sciences, Beijing, 100190, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. State Key Laboratory of Biochemical Engineering, Institute of Processing Engineering, Chinese Academy of Sciences, Beijing, 100190, China;1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, 750021, China;2. Key Laboratory of Clean Chemical Engineering in Universities of Shandong, College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao, 266042, China;1. College of Science, China Agricultural University, Beijing, 100083, China;2. Chinese Academy of Agricultural Mechanization Sciences Group Co., Ltd, Beijing, 100083, China |
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| Abstract: | The maximum-efficiency inlet velocity (MEIV) is a ceiling of inlet gas velocity that defines separation efficiency during cyclone design and operation. Experiment and computational fluid dynamics (CFD) simulation exhibited that an apex cone at the dust outlet can break the ceiling and improve the separation efficiency. The phenomenon is closely related to the effect of excessive high inlet gas velocity on the back-mixing escape of fine particles, which is the final result of back mixing, entrainment by the rapid upward airflow, and secondary separation of the inner vortex. In the center of the inner vortex, the airflow rotates slowly and moves rapidly upward. This elevator type of airflow delivers re-entrained particles to the vortex finder. A higher inlet gas velocity accelerates the elevator, causing more entrained particles to escape. This explains the decrease in efficiency at an excessively high inlet gas velocity. When an apex cone is installed at the dust outlet, the back-mixing is significantly weakened because the vortex core is bounded to the center of separator, while the transport effect of rapid upward airflow is weakened by the decrease in axial velocity in the center. Therefore, particle escape is weakened even at excessive high inlet gas velocities. Instead, the centrifugal effect is enhanced because of increased tangential velocity of the gas and particles. Consequently, the ceiling of inlet gas velocity is broken. |
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| Keywords: | Cyclone separator Inlet gas velocity Back mixing escape Precession vortex core Axial velocity |
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