The Study of the Effect of Bed Height on Bubble Diameter and Mass Transfer Area in a Fluidized Bed Reactor

Ghorbanpour, A.A; Ghannadi Maragheh, M

The Study of the Effect of Bed Height on Bubble Diameter and Mass Transfer Area in a Fluidized Bed Reactor

Document Type : Research Paper

Authors

A.A Ghorbanpour

M Ghannadi Maragheh

Abstract

Design, modeling and simulation of fluidized bed risers and reactors depend strongly on the knowledge, operational and hydrodynamic characteristics. In this study effort has been made to describe fluidization phenomenon and its application in fluidized beds is briefly explained. The bubble fluidized bed reactors will be introduced and the computerized calculation needed for simulating of a fluidized bed riser with 0.3m diameter and 5m height will be given. The effect of bed height on the bubble diameter and mass transfer area is calculated and the results are discussed. Operational conditions of the bed, type and characteristics of the catalyst, has been selected so as to suit the production of Maleic Anhydride from the n-Butane oxidation.

Highlights

J. G. Yates, “Fundamentals of fluidized-bed chemical processes,” Thetford Press )1983(.
F. A. Zenz, “Encyclopedia of chemical technology,” 3^rd Ed., 10, 564, Kirk Othmer (1978).
N. Mostoufi, H. Cui, J. Chaouki, “A comparison of two- and single-phase models for fluidized-bed reactors,” Ind. Eng. Chem. Res., 40, 5526-5532 (2001).
M. Foka, J. Chaouki, C. Guy, D. Klvana, “Gas-phase hydrodynamics of a gas-solid turbulent fluidized bed reactor,” Chem. Eng. Sci., 51, 713 (1996).
M. Horio and A. Nonaka, “Generalized bubble diameter correlations for gas-solid fluidized beds,” AICHe J., 33, 1865 (1987).
D. Bai and A. Issangya, “Characteristics of gas-fluidized beds in different flow regimes,” Ind. Eng. Chem. Res., 38, 803 (1999).
J. R. Grace and R. Clift, “On the two-phase theory of fluidization,” Chem. Eng. Sci., 29, 327-334 (1974).
N. Mostoufi and J. Chaouki, “On the axial movement of solids in gas-solid fluidized beds,” Trans. Ind. Chem. Eng. A, 78, 911 (2000).
M. Lockett, J. Davidson, D. Harrison, “On the two-phase theory of fluidization,” Chem. Eng. Sci., 22, 1059-1066 (1967).
H. Cui and N. Mostoufi, “Characterization of dynamic gas-solid distribution in fluidized bed,” Chem. Eng. J., 79, 135 (2000).
J. Davidson and D. Harrison, “Fluidization,” 2^nd Eds., Academic Press, London (1985).
J. Whrther, “Scale-up modeling for fluidized bed reactors,” Chem. Eng. Sci., 47(9-11), 2475-2462 (1992).
D. Kunni and O. Levenspiel, “Fluidization engineering,” 2^nd Ed., Boston, MA. (1991).
T. Pugsley, G. Patience, F. Berruti, J. Chaouki, “Modeling the catalytic oxidation of n-Butane to Maleic Anhydride in a circulating fluidized bed reactor,” Ind. Eng. Chem. Res., 31, 2652-2660 (1992).
D. Geldart, “Types of gas fluidization,” Powder Technol., 7, 285-292 (1973).
Perry, “Perry’s Chemical Engineering Handbook, 6^th Ed. (1984).

Keywords

fluidized bed reactor

fluidization phenomena

fuidized bed riser

mass transfer area

J. G. Yates, “Fundamentals of fluidized-bed chemical processes,” Thetford Press )1983(.
F. A. Zenz, “Encyclopedia of chemical technology,” 3^rd Ed., 10, 564, Kirk Othmer (1978).
N. Mostoufi, H. Cui, J. Chaouki, “A comparison of two- and single-phase models for fluidized-bed reactors,” Ind. Eng. Chem. Res., 40, 5526-5532 (2001).
M. Foka, J. Chaouki, C. Guy, D. Klvana, “Gas-phase hydrodynamics of a gas-solid turbulent fluidized bed reactor,” Chem. Eng. Sci., 51, 713 (1996).
M. Horio and A. Nonaka, “Generalized bubble diameter correlations for gas-solid fluidized beds,” AICHe J., 33, 1865 (1987).
D. Bai and A. Issangya, “Characteristics of gas-fluidized beds in different flow regimes,” Ind. Eng. Chem. Res., 38, 803 (1999).
J. R. Grace and R. Clift, “On the two-phase theory of fluidization,” Chem. Eng. Sci., 29, 327-334 (1974).
N. Mostoufi and J. Chaouki, “On the axial movement of solids in gas-solid fluidized beds,” Trans. Ind. Chem. Eng. A, 78, 911 (2000).
M. Lockett, J. Davidson, D. Harrison, “On the two-phase theory of fluidization,” Chem. Eng. Sci., 22, 1059-1066 (1967).
H. Cui and N. Mostoufi, “Characterization of dynamic gas-solid distribution in fluidized bed,” Chem. Eng. J., 79, 135 (2000).
J. Davidson and D. Harrison, “Fluidization,” 2^nd Eds., Academic Press, London (1985).
J. Whrther, “Scale-up modeling for fluidized bed reactors,” Chem. Eng. Sci., 47(9-11), 2475-2462 (1992).
D. Kunni and O. Levenspiel, “Fluidization engineering,” 2^nd Ed., Boston, MA. (1991).
T. Pugsley, G. Patience, F. Berruti, J. Chaouki, “Modeling the catalytic oxidation of n-Butane to Maleic Anhydride in a circulating fluidized bed reactor,” Ind. Eng. Chem. Res., 31, 2652-2660 (1992).
D. Geldart, “Types of gas fluidization,” Powder Technol., 7, 285-292 (1973).
Perry, “Perry’s Chemical Engineering Handbook, 6^th Ed. (1984).