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기체유동층에서 입자비산속도에 대한 온도와 입자밀도의 영향
Effects of Temperature and Particle Density on Particle Entrainment Rate in a Gas Fluidized Bed
HWAHAK KONGHAK, April 1997, 35(2), 173-180(8), NONE
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Abstract
입자비산속도에 대한 정성적인 온도영향을 광범위하게 이해하기 위해서 기체유동층(직경 0.1m, 높이 2.1m)에서 유속(0.8-2.2m/s), 온도(12-600℃), 입자밀도(2509-6158kg/m3), 입도(0.091-0.363mm)에 따른 입자비산속도를 측정하였다. 입자비산속도는 온도가 증가함에 따라 감소하여 최소값을 보인 후 다시 증가하는 경향을 나타내었으며, 유속 또는 입자밀도가 증가함에 따라 온도의 영향은 둔화되었다. 본 실험범위에서 입자비산속도의 변화경향은 유동화속도가 종말속도인 입경의 변화와 매우 유사함을 확인할 수 있었다.
To understand qualitative effect of temperature on particle entrainment rate, experiments were carried out in a gas fluidized bed(0.1m i.d. and 2.1m height). Gas velocities(0.8-2.2m/s), bed temperatures(12-600℃), particle densities(2509-6158kg/m3) and particle sizes(0.091-0.363mm) were considered as the experimental variables. The particle entrainment rate increased after an initial decrease with increasing bed temperature. The effect of temperature on particle entrainment rate decreased as the gas velocity of the particle density increased. Within the experimental range, it could be confirmed that the change of the particle entrainment rate was very similar to the change of the particle size of which terminal velocity was equal to the gas velocity.
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Demmich J, bohnet M, Verfahrenstechnik, 12, 430 (1978)
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Romanova TT, Deposited Doc., Viniti 5129-80 (1980)
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May WG, Russel FR, Paper Presented at the North Jersey Section of the A.C.S. (1954)
Zenz FA, Weil NA, AIChE J., 4, 472 (1958)
Chan IH, KnowIton TM, "Fluidization IV," edited by Kunii, D. and Toci, R., Engineering Foundation, 283 (1984)
Knowlton TM, "Fluidization VII," edited by Potter, O.E. and Nicklin, D.J., 27 (1992)
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Choi JH, Kim KJ, Kim P, HWAHAK KONGHAK, 32(3), 489 (1994)
Ergun S, Chem. Eng. Prog., 48, 89 (1952)
Wen CY, Yu YH, AIChE J., 12, 610 (1966)
Sotoko VE, Mikhalev MF, Mukhlenov IP, Int. Chem. Eng., 9, 280 (1969)
Yoon YS, "Entrainment of Coal in Fluidized Beds," Master Thesis, Korea Advanced Institute of Science and Technology (1981)
Geldart D, "Fluidization," Edited by Davidson, J.F., Clift R. and Harrison D., Academic Press, London, 383 (1985)
Geldart D, Cullinan J, Georghiades S, Gilvray D, Pope DJ, Trans. IChemE, 57, 269 (1979)
Colakyan M, Levenspiel O, Powder Technol., 38, 223 (1984)
Colakyan M, Levenspiel O, Powder Technol., 43, 73 (1985)
