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Received June 29, 2001
Accepted September 24, 2001
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Characteristics of Slug Flow in a Fluidized Bed of Polyethylene Particles
Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Korea 1Hanwha Petrochemical Co., Daejeon 305-345, Korea
Korean Journal of Chemical Engineering, January 2002, 19(1), 183-189(7), 10.1007/BF02706893
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Abstract
The slug flow behavior of polyethylene particles was examined in a fluidized bed of 7 cm ID and 50 cm in height. The employed polymer particles were high density polyethylene (HDPE) with the average particle size of 603 mm. The slugging flow of polyethylene particles was analyzed from the measured pressure drop signals by classical statistical methods such as absolute average deviation, probability density function, power spectrum, auto-correlation, and cross-correlation. The results show that in spite of high dielectric constant of polymer particles, the slugging_x000D_
phenomena such as incipient slugging velocity, slugging frequency and slugging rise velocity were very similar to the Geldart B type non-polymeric particles. It was observed that slug frequencies decreased with gas velocity and the limiting slug frequency was observed for the gas velocities in this study.
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References
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Broadhurst TE, Becker HA, AIChE J., 21, 238 (1975)
Chen Z, Gibilaro LG, Foscolo PU, Chem. Eng. Sci., 52(1), 55 (1997)
Cho HI, Chung CH, Han GY, Ahn GR, Kong JS, Korean J. Chem. Eng., 17(3), 292 (2000)
Cho H, Han G, Ahn G, Korean J. Chem. Eng., 18(4), 561 (2001)
Choi KY, Ray WH, Chem. Eng. Sci., 40, 2261 (1985)
Dimattia DG, Amyotte PR, Hamdullahpur F, Can. J. Chem. Eng., 75(2), 452 (1997)
Fan LT, Ho TC, Hiraoka S, Walawender WP, AIChE J., 27, 388 (1981)
Ho TC, Yutani N, Fan LT, Walawender WP, Powder Technol., 35, 249 (1983)
Karamavruc AI, Clark NN, Chem. Eng. Sci., 52(3), 357 (1997)
Ko YG, Cho HS, Choi KH, Lee WY, Korean J. Chem. Eng., 16(5), 562 (1999)
Lee SH, Lee DH, Kim SD, Korean J. Chem. Eng., 18(3), 387 (2001)
Satija S, Fan LT, AIChE J., 31, 1554 (1985)
Steppan ML, Schouten JC, Bleek CM, "Deterministic Chaos Analysis of the Dynamical Behavior of Slugging and Bubbling Fluidized Beds," Proc. 12th Intl Conf. On Fluidized bed Combustion, Ed. Anthony, E.J., 1, 129 (1993)
Stewart PSB, Davidson JF, Powder Technol., 1, 61 (1967)
Svoboda K, Cermak J, Hartman M, Drahos J, Selucky K, AIChE J., 30, 513 (1984)
