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Received July 12, 2009
Accepted November 19, 2009
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Hydrodynamic characteristics of cold-bed circulating fluidized beds for the methanol to olefins process
Department of Chemical Engineering, SungKyunKwan University, 300 Chunchun, Jangan, Suwon 440-746, Korea 1Department of Chemical Engineering, DanKook University, 126, Yongin 448-701, Korea 2Alternative Chemicals/Fuel Research Centre, Korea Research Institute of Chemical Technology, P.O. Box 107, Yuseong-gu, Daejeon 305-600, Korea
dhlee@skku.edu
Korean Journal of Chemical Engineering, July 2010, 27(4), 1328-1332(5), 10.1007/s11814-010-0187-6
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Abstract
The effects of the riser inlet velocity (2.2-3.9 m/s), seal-pot inlet velocity (2.4-7.1 Umf), aeration flow rate (2.5×10^(-7)-3.7×10^(-6) m3/s) in seal-pot, and solid inventory (0.15-0.2 kg) on the hydrodynamic characteristics of a 9 mm-ID×1.9 m-high cold-bed circulating fluidized bed for methanol to olefins (MTO) process were investigated. FCC (Engelhard; 82.4 μm) particles were used as bed particles. Most of the experimental flow regimes were observed in fast fluidization_x000D_
and pneumatic transport regimes. The axial solid holdup in a riser increased with increasing solid mass flux and solid inventory. Solid mass flux increased proportionally until reaching a maximum value and then decreased with increasing seal-pot inlet velocity. The obtained hydrodynamic characteristics in the cold-bed circulating fluidized beds were compared with previous results.
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Yerushalmi J, Cankurt NT, Powder Technol., 24, 187 (1979)
Arena U, Cammarota A, Pistone L, in Circulating fluidized bed technology, P. Basu, Ed., Toronto, Pergamon Press, 119 (1986)
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Wahabi SM, Conversion of methanol to light olefins on SAPO-34 kinetic modeling and reactor design., Ph.D. Dissertation, Texas A&M, USA (2003)
Yousfi Y, Gau G, Chem. Eng. Sci., 29, 1939 (1974)
Biswas J, Leung LE, Powder Technol., 51, 179 (1987)
Namkung W, Kim SW, Kim SD, Chem. Eng. J., 72(3), 245 (1999)
Kim SW, Solids recycle and heat transfer characteristics in a pressurized circulating fluidized bed system., Ph.D. Thesis, KAIST, Daejeon, Korea (2002)
Brereton CMH, Fluid mechanics of high velocity fluidized beds., Ph.D. Dissertation, University of British Columbia, Vancouver, Canada (1987)
Grace JR, Bi H, Golriz M, in Handbook of fluidization and fluid-particle systems, Yang WC Ed., New York, Marcel Dekker Inc.
Kim SW, Kim SD, Lee DH, Ind. Eng. Chem. Res., 41(20), 4949 (2002)
Cho YJ, Hydrodynamics and heat transfer characteristics in a circulating fluidized bed., Ph.D. Thesis, KAIST, Daejeon, Korea (1994)
Kim SW, Namkung W, Kim SD, Chem. Eng. Technol., 24(8), 843 (2001)
