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Received February 22, 2008
Accepted October 3, 2008
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Hydrodynamics of Geldart group A particles in gas-solid fluidized beds
Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
lleulii@ntu.edu.tw
Korean Journal of Chemical Engineering, March 2009, 26(2), 513-517(5), 10.1007/s11814-009-0087-9
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Abstract
Geldart group A particles were fluidized in a 10 cm i.d.×1.8 m high Plexiglas-made bed with ambient air to determine the hydrodynamic properties in a gas-solid fluidized bed. The effects of static bed heights, position of pressure measuring points, differential and absolute pressure fluctuations on the hydrodynamic behavior of a Geldart group A particles in a gas-solid fluidized bed were investigated. The particles used in this study were 80 micrometer FCC powders and 60 micrometer glass beads. The variance of pressure fluctuations was used to find the minimum_x000D_
bubbling velocity. The obtained minimum bubbling velocity was compared with the other methods available in the literature. This method was found to be much easier and had better data reproducibility than the classical visual method or sedimentation method. The variance of pressure fluctuations increased due to the increase of superficial gas velocity and static bed height. The obtained minimum bubbling velocity and pressure fluctuations were found to depend on the measuring position along the axial direction. The effect of measuring position was discussed. Cross-correlation of two pressure signals was used to find the delay time, then the bubble rising velocity.
References
Geldart D, Powder Technol., 7, 285 (1973)
Morooka S, Nishinaka M, Kato Y, Kagaku Kogaku Ronbonshu, 37, 485 (1973)
Choi JH, Kim TW, Moon YS, Kim SD, Son JE, Powder Technol., 131(1), 15 (2003)
Abrahamsen AR, Geldart D, Powder Technol., 26, 35 (1980)
Puncochar M, Drahos J, Cermak J, Selucky K, Chem. Eng. Commun., 35, 81 (1985)
Lee SH, Kim SD, Park SH, Korean J. Chem. Eng., 19(6), 1020 (2002)
Leu LP, Pan RS, Can. J. Chem. Eng., 82(5), 1044 (2004)
Sitnai O, Chem. Eng. Sci., 37, 1059 (1982)
Toomey RD, Johnstone HF, Chem. Eng. Prog., 48, 220 (1952)
Liu TB, Pressure fluctuations in bubbling fluidized beds, MS thesis, Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan (2004)
Morooka S, Nishinaka M, Kato Y, Kagaku Kogaku Ronbonshu, 37, 485 (1973)
Choi JH, Kim TW, Moon YS, Kim SD, Son JE, Powder Technol., 131(1), 15 (2003)
Abrahamsen AR, Geldart D, Powder Technol., 26, 35 (1980)
Puncochar M, Drahos J, Cermak J, Selucky K, Chem. Eng. Commun., 35, 81 (1985)
Lee SH, Kim SD, Park SH, Korean J. Chem. Eng., 19(6), 1020 (2002)
Leu LP, Pan RS, Can. J. Chem. Eng., 82(5), 1044 (2004)
Sitnai O, Chem. Eng. Sci., 37, 1059 (1982)
Toomey RD, Johnstone HF, Chem. Eng. Prog., 48, 220 (1952)
Liu TB, Pressure fluctuations in bubbling fluidized beds, MS thesis, Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan (2004)
