Hydrodynamic characteristics of fine particles in the riser and standpipe of a circulating fluidized bed |
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Authors: | Jong-Hyeun Choi Jin-Ho Park Won-Myung Choung Yong Kang Sang Done Kim |
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Affiliation: | (1) Mechanical and Chemical Engineering Research Department, Korea Atomic Energy Research Institute, 305-606 Taejon, Korea;(2) Department of Chemical Engineering, Chungnam National University, 305-764 Taejon, Korea;(3) Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 305-701 Taejon, Korea |
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Abstract: | The hydrodynamic properties in the riser and standpipe. and the cyclone efficiency have been determined in a circulating fluidized
bed (CFB) unit consisting of a riser (0.05 m-IDX3.8 m high), a standpipe (0.068 m-IDX2.5 m high) as a primary cyclone/bubbling
fluidized bed, and a secondary cyclone. Silica gel powder (mean diameter = 46 μm) was used as the bed material. The effects
of gas velocity in the riser and initial solid loading on the solid circulation rate, and the solid holdups in the riser and
standpipe have been determined. The effects of gas velocity in the standpipe on the efficiencies of primary and secondary
cyclones have been also determined as functions of solid circulation rate and solid entrainment rate. The solid circulation
rate increases with increases in the gas velocity in the riser and in the initial solid loading. The efficiencies of primary
and secondary cyclones increase with an increase in the gas velocity in the riser. However, the efficiency of primary cyclone
decreases and that of secondary cyclone increases slightly, with an increase in the gas velocity in the standpipe. |
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Keywords: | Circulating Fluidized Bed Solid Circulation Rale Gas Velocity Solid Holdup |
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