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순환유동층에서의 축방향 고체체류량 분포
Axial Solid Holdup Distribution in a Circulating Fluidized Bed
HWAHAK KONGHAK, April 1994, 32(2), 241-247(7), NONE
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Abstract
순환유동층(내경 0.1m, 높이5.3m)에서 층물질로 FCC 입자를 사용하여 기상유속(1.5-3.5 m/s)과 고체순환속도(10-50 kg/㎡s)가 축방향 고체체류량 분포에 미치는 영향을 연구하였다. 상승관내의 고체체류량은 고체순환속도가 증가할수록 증가하였고, 기상유속이 증가함에 따라 감소하였다. 상승관내의 축방향 고체체류량 분포는 하부에 고체체류량이 높은 농후상 영역에서 상부에 고체체류량값이 거의 일정하고 낮은 희박상영역으로 높이에 따라 감소하는 형태를 나타내었다. 회박상내의 고체체류량은 기상유속, 고체순환속도와 slip factor를 이용하여 예측이 가능하였고, slip factor가 2-4의 범위내에서 실험값과 예측된 값이 잘 일치하였다. 상승관내의 축방향 고체체류량 분포에 대한 상관식을 무차원군을 이용하여 제시하였다.
The effects of gas velocity(1.5-3.5m/s) and solid circulation rate(10-50kg/m2s)on the axial solid holdup distribution have been determined in a 0.1m-I.D. 5.3m-high circulating fluidized bed. Solid holdup in the riser increases with an increase in solid circulation rate, but decreases with increasing gas velocity. The solid holdup decreases from the dense phase can be predicted from the ratio of solid to gas velocities and slip factor in the range of 2-4. The axial solid holdup distribution in a circulating fluidized bed has been correlated with the pertinent dimensionless groups.
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Patience GS, Chaouki J, Beruti F, Wong R, Powder Technol., 72, 31 (1992)
Bai DR, Jin Y, Yu ZQ, Zhu JX, Powder Technol., 71, 51 (1992)
Grace JR, Chem. Eng. Sci., 45, 1953 (1990)
Grewal NS, Maurer RD, Fox W, Proc. of the 1991 Int. Conf. on FBC, eds. by E.J. Anthony, 317 (1991)
Kato K, Shibasaki H, Tamura K, Arita S, Wang C, Takarada T, J. Chem. Eng. Jpn., 22, 205 (1989)
Rhodes MJ, Geldart D, Chem. Eng. Res. Des., 67, 20 (1989)
Kwauk M, Wang N, Li Y, Chen B, Shen Z, "Circulating Fluidized Bed Technol," ed. by P. Basu, Pergamon Press, New York, 33 (1986)
Chang H, Louge M, Powder Technol., 70, 259 (1992)
Glicksman LR, Chem. Eng. Sci., 39(9), 1373 (1984)
