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Received October 23, 2001
Accepted February 7, 2002
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Axial Dispersion of Gas in a Circulating Fluidized Bed
Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Korea 1Korea Institute of Energy Research, Daejeon 305-343, Korea
Korean Journal of Chemical Engineering, May 2002, 19(3), 491-494(4), 10.1007/BF02697162
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Abstract
An axial dispersion of gas in a circulating fluidized bed was investigated in a fluidized bed of 4.0 cm I.D. and 279 cm in height. The axial dispersion coefficient of gas was determined by the stimulus-response method of trace gas of CO2. The employed particles were 0.069 mm and 0.147 mm silica-sand. The results showed that axial dispersion coefficients were increased with gas velocity and solid circulation rates as well as suspension density. The experimentally determined axial dispersion coefficients in this study were in the range of 1.0-3.5 m(2)/s.
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Brereton CM, Grace JR, Yu J, "Axial Gas Mixing in a CFB," CFB Technology II, Basu P. and Large, J.F., eds., Pergamon Press, New York (1988)
Cankurt NT, Yerushalmi J, "Gas Backmixing in High Velocity Fluidized Beds," Fluidization, Davison, J.F. and Keairns, D.L., eds., Cambridge Univ. Press, London (1978)
Cho HI, Chung CH, Han GY, Ahn GR, Kong JS, Korean J. Chem. Eng., 17(3), 292 (2000)
Gayan P, Dediego LF, Adanez J, Powder Technol., 94(2), 163 (1997)
Kim SW, Ahn JY, Lee DH, Kim SD, Korean J. Chem. Eng., 18(4), 555 (2001)
Li J, Weinstein H, Chem. Eng. Sci., 44, 1697 (1989)
Li Y, Wu P, "A Study on Axial Gas Mixing in a Fast Fluidized Bed," CFB Technology III, Basu, O., Horio, M. and Hasatani, M., eds., Pergamon Press, New York (1991)
Namkung W, Kim SD, Korean J. Chem. Eng., 16(4), 456 (1999)
Patience GS, Chaouki J, Chem. Eng. Sci., 48, 3195 (1993)
Sterneus J, Johnsson F, Leckner B, Chem. Eng. Sci., 55(1), 129 (2000)
