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Received February 26, 2002
Accepted May 30, 2002
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Hydrodynamic Characteristics of a FCC Regenerator
1Department of Chemical and Biomolecular Engineering and Energy & Environment Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea 2Smelting Reduction Research Team, RIST, Pohang 790-600, Korea
kimsd@kaist.ac.kr
Korean Journal of Chemical Engineering, January 2003, 20(1), 110-115(6), 10.1007/BF02697194
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Abstract
The hydrodynamic and gas mixing characteristics have been determined in a FCC regenerator (0.48 m I.D.×3.4 m high) with FCC particles. Solids holdup in the dense bed decreases with increasing gas velocity, but it increases in the freeboard region. The bubble/void fraction increases with an increase along the bed height at a given gas velocity and increases with increasing gas velocity at a constant bed height. Backmixed tracer gas at the wall region is higher than that at the center region of the bed. The gas backmixing coefficient decreases with increasing gas velocity.
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References
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Cankurt NT, Yerushalmi J, "Gas Backmixing in High Velocity Fluidized Beds," Fluidization, Davidson, J.F. and Kearins, D.L, eds., Cambridge Univ. Press, London, 387 (1978)
Choi YT, Kim SD, J. Chem. Eng. Jpn., 24, 195 (1991)
Clift R, Grace JR, "Fluidization," Davidson, J.F., Harrison, D. and Clift, R., Eds., Academic Press Inc., London, 73 (1985)
Farag HI, Ege PE, Grislingas A, Delasa HI, Can. J. Chem. Eng., 75(5), 851 (1997)
Kim SW, Namkung W, Kim SD, "Bubble/void Properties in a FCC Regenerator," Proc. 6th Asian Conf. on Fluidized-bed and Three-phase Reactors, eds. by H.S. Chun and S.D. Kim, Cheju, Korea, 43 (1998)
Kim SW, Namkung W, Kim SD, J. Chem. Eng. Jpn., 33(1), 78 (2000)
Lee GS, Kim SD, Chem. Eng. Commun., 86, 91 (1989)
Lee GS, Kim SD, Korean J. Chem. Eng., 8(1), 6 (1991)
Namkung W, Kim SD, Powder Technol., 99(1), 70 (1998)
Namkung W, Kim SD, HWAHAK KONGHAK, 36(5), 797 (1998)
Namkung W, Kim SD, Korean J. Chem. Eng., 16(4), 456 (1999)
Namkung W, Kim SW, Kim SD, HWAHAK KONGHAK, 38(4), 523 (2000)
Senior RC, Avidan AA, "Comparison of the Performance of Circulating and Turbulent Bed FCC REgenerators," Proc. of 5th Int. Conf. on Circulating Fluidized Bed, Beijing, China (1996)
Wilson JW, "Fluid Catalytic Cracking-Technology and Operation," Penn Well Publishing Company, Oklahoma, U.S.A. (1997)