액상 유동층의 입자분산

강용; 나종복; 민병철; 이강일; 김상돈

HWAHAK KONGHAK, Vol.28, No.2, 177-183, April, 1990

Export Citation

액상 유동층의 입자분산

Fluidizing Particle Dispersion in a Liquid Fluidized Bed

강용, 나종복, 민병철, 이강일, 김상돈

초록

액체 유동층(0.152m-내경×2.5m-높이)에서 정상상태에 도달하는 압력변화 과정과 유동입자의 분산 및 입자의 빈도수 등의 유동입자의 동특성을 relaxation 방법에 의하여 해석하였다. 유동입자의 크기(1.0-1.6mm), 액상유속(30-140mm/s)이 유동입자의 분산계수 및 입자의 빈도수에 미치는 영향을 결정하였다. 유동입자의 분산과 빈도수는 액체유속과 층 공극률의 증가에 따라 최대값을 나타내며 이 최대값을 나타내는 층 공극률은 유동입자 흐름형태가 변환되는 층 공극률과 거의 일치하였다.

The dispersion and frequency of fluidizing particles and the histogram of pressure fluctuations have been analyzed in a liquid fluidized bed. The effects of particle size(1.0-6.0mm)and liquid velocity(3-14cm/s)on the dispersion coefficient and frequency of fluidizing particles have been determined in a 0.152m-ID×2.5m high Plex-iglas column. The dispersion coefficient and frequency of fluidizing particles exhibit their maximum values with an in-crease in liquid velocity and consequent increase in bed porosity. The maximum particle dispersion coefficient ex-hibits at the bed porosity where the flow transition of particles occurs in the bed.

[References]

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[1] Al-Dibouni MR, Garside J, Trans. IChemE, 57, 94 (1979)

[2] Ganguly UP, Can. J. Chem. Eng., 60, 470 (1982)

[3] Martin BLA, Kolar Z, Wesselingh JA, Trans. IChemE, 59, 100 (1981)

[4] Yutani N, Otake N, Too JR, Fan LT, Chem. Eng. Sci., 37, 1079 (1982)

[5] Kang Y, Kim SD, Ind. Eng. Chem. Process Des. Dev., 25, 717 (1986)

[6] Muroyama K, Fan LS, AIChE J., 31, 1 (1985)

[7] Mudhi I, Mikaie S, Kamo S, Okamoto M, Kag. Kog., 25, 757 (1961)

[8] Kennedy D, Brettan RH, AIChE J., 12, 24 (1966)

[9] Handley D, Doraisamy A, Butcher KL, Franhlin NL, Trans. Inst. Chem. Eng., 44, T260 (1966)

[10] Yutanui N, Fan LT, Powder Technol., 42, 145 (1985)

[11] Chiang CL, "An Introduction to Stochastic Processes and Their Applications," Krieger, New York (1980)

[12] Hori J, "Langevin Equation," Iwanami, Tokyo (1977)

[13] Kang Y, Suh IS, Kim SD, Chem. Eng. Commun., 34, 1 (1985)

[14] Kang Y, Kim SD, Particulate Sci. Technol., 6, 133 (1988)

[15] Kim SD, Kang Y, Kwon HK, AIChE J., 32, 1397 (1986)

[16] van der Meer AP, Blanchard CMJP, Wesselingh JA, Chem. Eng. Res. Des., 62, 214 (1984)

[17] Carlos CR, Richardson JF, Chem. Eng. Sci., 23, 825 (1968)