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Received May 3, 2002
Accepted September 27, 2002
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Pressure Fluctuation Characteristics of Polyethylene Particles in a Gas-Solid Fluidized Bed with Different Distributors
Department of Chemical Engineering, SungKyunKwan University, Suwon 440-746, Korea
Korean Journal of Chemical Engineering, November 2002, 19(6), 1112-1116(5), 10.1007/BF02707241
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Abstract
The effects of gas velocity (0.10-0.68 m/s), distributor geometry (opening area ratio, number of orifices and hole sizes) and the particle size distribution (wide and narrow) of polyethylene on the pressure fluctuation of the distributor and the local pressure drop in the beds have been determined in a gas-solid fluidized bed of 0.07-m I.D. and 0.7 m in height. The mean amplitude and the normalized standard deviation of the local pressure drop were determined by analyzing pressure fluctuation in the bed. The variation of the mean amplitude of the local pressure drop_x000D_
with the gas velocity is independent on the different distributors. The normalized standard deviation of the local pressure drop increased with increasing the ratio of the excess gas velocity to the minimum fluidization velocity and the lumped parameter of the distributor, hD. Also, the normalized standard deviation of the local pressure drop of polyethylene polymerized by Metallocene catalyst (narrow) is higher than that of polyethylene polymerized by Ziegler-Natta catalyst (wide).
References
Burdett ID, Eisinger RS, Cai P, Lee HH, "Gas-Phase Fluidization Technology for Production of Polyolefins," Fluidization, X., Kwauk, M., Li, J. and Yang W.C., eds., United Eng. Found., New York, 39 (2001)
Cho H, Han G, Ahn G, Korean J. Chem. Eng., 19(1), 183 (2002)
Cho H, Han G, Ahn G, Korean J. Chem. Eng., 18(4), 561 (2001)
Ergun S, Chem. Eng. Prog., 48, 89 (1952)
Jiang PJ, Bi HT, Liang SC, Fan LS, AIChE J., 40(2), 193 (1994)
Kunii D, Levenspiel O, "Fluidization Engineering," 2nd ed., Butterworth-Heinemann (1992)
Lee SH, Lee DH, Kim SD, Korean J. Chem. Eng., 19(2), 351 (2002)
Lee SH, Lee DH, Kim SD, Korean J. Chem. Eng., 18(3), 387 (2001)
McAuley KB, Talbot JP, Harris TJ, Chem. Eng. Sci., 49(13), 2035 (1994)
Stewart PSB, Davidson JF, Powder Technol., 1, 61 (1967)
Tsuchiya K, Nakanishi O, Chem. Eng. Sci., 47, 3347 (1992)
Yamashida F, Inoue H, J. Chem. Eng. Jpn., 8, 334 (1975)
Cho H, Han G, Ahn G, Korean J. Chem. Eng., 19(1), 183 (2002)
Cho H, Han G, Ahn G, Korean J. Chem. Eng., 18(4), 561 (2001)
Ergun S, Chem. Eng. Prog., 48, 89 (1952)
Jiang PJ, Bi HT, Liang SC, Fan LS, AIChE J., 40(2), 193 (1994)
Kunii D, Levenspiel O, "Fluidization Engineering," 2nd ed., Butterworth-Heinemann (1992)
Lee SH, Lee DH, Kim SD, Korean J. Chem. Eng., 19(2), 351 (2002)
Lee SH, Lee DH, Kim SD, Korean J. Chem. Eng., 18(3), 387 (2001)
McAuley KB, Talbot JP, Harris TJ, Chem. Eng. Sci., 49(13), 2035 (1994)
Stewart PSB, Davidson JF, Powder Technol., 1, 61 (1967)
Tsuchiya K, Nakanishi O, Chem. Eng. Sci., 47, 3347 (1992)
Yamashida F, Inoue H, J. Chem. Eng. Jpn., 8, 334 (1975)
