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Received February 9, 2001
Accepted March 16, 2001
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Slug Characteristics of Polymer Particles in a Fluidized Bed with Different Distributors
Department of Chemical Engineering and Energy & Environment Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
kimsd@kaist.ac.kr
Korean Journal of Chemical Engineering, May 2001, 18(3), 387-391(5), 10.1007/BF02699183
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Abstract
Pressure fluctuations in a fluidized bed (0.38 m-I.D.×4.4 m-high) of 1.23-mm polymer particles (LLDPE) were measured with different distributors. Slug characteristics (slug frequency and slug rising velocity) were determined by analyzing pressure fluctuations in the bed. The effects of gas velocity (0.6-1.2 m/s) and distributor geometry (opening area ratio, number of orifices and distributor types) on the slug characteristics were determined. The slug frequency decreases slightly with increasing gas velocity. However, slug rising velocity increases linearly with increasing excess fluidization velocity regardless of the distributors used.
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Brodhurst TE, Becker HA, "Measurement and Spectral Analysis of Pressure Fluctuations in Slugging Beds," Fluidization Technology, D.L. Keairns, Ed., I, 63, Hemisphere Pub., Washington, DC (1976)
Davidson JF, Harrison D, "Fluidization," Academic Press, New York (1977)
De Luca L, Di Felico R, Foscolo PU, Powder Technol., 69, 171 (1992)
Dimattia DG, Amyotte PR, Hamdullahpur F, Can. J. Chem. Eng., 75(2), 452 (1997)
Fan LT, Ho TC, Walawender WP, AIChE J., 29, 33 (1983)
Geldart D, "Gas Fluidization Technology," 1(st) ed., John Wiley & Sons Ltd. (1986)
Kim GJ, Kim JL, Choi JH, Kim SD, Chem. Ind. Technol., 15(1), 32 (1997)
Kim S, Han G, HWAHAK KONGHAK, 37(2), 191 (1999)
Kunii D, Levenspiel O, "Fluidization Engineering," 2(dn) ed., Butterworth-Heinemann (1991)
Lee GS, Kim SD, Korean J. Chem. Eng., 6(1), 15 (1989)
Noordergraaf IW, Van Dijk A, Van Den Bleek CM, Powder Technol., 52, 59 (1987)
Sakata M, Miyauchi T, Kag. Kog. Ronbunshu, 6, 428 (1980)
Shichun C, Heling Z, Feichen J, "A Study of Hydrodynamics Behavior of the Slugging Fluidized Bed," Fluidization, M. Kwauk and D. Kunii, Eds., Elsevier, Amsterdam, 75 (1985)
Satija S, Fan LS, AIChE J., 31, 1554 (1985)
Tsuchiya K, Nakanishi O, Chem. Eng. Sci., 47, 3347 (1992)
Turton R, Clark NN, Powder Technol., 59, 117 (1989)
Wen CY, King DF, "Distributor Design," Proc. DOE/WVU Conference on Fluidized-bed Combustion System Design and Operation, 164 (1980)
Yamashita F, Inoue H, J. Chem. Eng. Jpn., 8, 334 (1975)
