Prediction of Axial Solid Holdups in a CFB Riser

Sang-Soon Park; Ho-Jeong Chae; Tae-Wan Kim; Kwang-Eun Jeong; Chul-Ung Kim; Soon-Yong Jeong; JongHun Lim; Young-Kwon Park; Dong Hyun Lee

Korean Chemical Engineering Research, Vol.56, No.6, 878-883, December, 2018

DOI10.9713/kcer.2018.56.6.878 Export Citation

Prediction of Axial Solid Holdups in a CFB Riser

Sang-Soon Park, Ho-Jeong Chae, Tae-Wan Kim, Kwang-Eun Jeong, Chul-Ung Kim, Soon-Yong Jeong, JongHun Lim¹, Young-Kwon Park², and Dong Hyun Lee^{1, †}

Green Chemistry Research Division, Korea Research Institute of Chemical Technology,, 141, Gajeong-ro, Yuseong-gu, Daejeon, 34114, Korea
¹Department of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419 Korea
²School of Environmental Engineering, University of Seoul, 163, Seoulsiripdae-ro, Dongdaemun-gu, Seoul, 02504, Korea

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A circulating fluidized bed (CFB) has been used in various chemical industries because of good heat and mass transfer. In addition, the methanol to olefins (MTO) process requiring the CFB reactor has attracted a great deal of interest due to steep increase of oil price. To design a CFB reactor for MTO pilot process, therefore, we has examined the hydrodynamic properties of spherical catalysts with different particle size and developed a correlation equation to predict catalyst holdup in a riser of CFB reactor. The hydrodynamics of micro-spherical catalysts with average particle size of 53, 90 and 140 mm was evaluated in a 0.025 m-ID x 4 m-high CFB riser. We also developed a model described by a decay coefficient to predict solid hold-up distribution in the riser. The decay coefficient developed in this study could be expressed as a function of Froude number and dimensionless velocity ratio. This model could predict well the experimental data obtained from this work.

Keywords:Decay factor;Axial solid holdup;Circulating fluidized bed (CFB)

[References]

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Lei H, Horio MJ, Chem. Eng. Japan, 31, 83 (1998)
Bai D, Kato K, Powder Technol., 101(3), 183 (1999)
Kunii D, Levenspiel O, Powder Technol., 84(1), 83 (1995)
Kim SW, Kim SD, Lee DH, Ind. Eng. Chem. Res., 41(20), 4949 (2002)
Brereton C, Stromberg L, Basu P(Ed), “Some Aspects of the Fluid Behavior of Fast Fluidized Beds,” CFB Tech., Pergamon, New York, p133(1986).
Rhodes MJ, Geldart D, “The Hydrodynamics of Re-Circulating Fluidized Beds,” Ed by Basu P. CFB Techol., 193(1986).
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[1] Das M, Meikap BC, Saha RK, Chem. Eng. J., 145(1), 32 (2008)

[2] Gupta SK, Berruti F, Powder Technol., 108(1), 21 (2000)

[3] Bai D, Kato K, Powder Technol., 101(3), 183 (1999)

[4] Matsen J, Design and Scale-up of CFB Catalytic Reactors, London, 489-503(1997).

[5] Bai DR, Jin Y, Yu ZQ, Zhu JX, Powder Technol., 71, 51 (2000)

[6] Kwauk M, ed., “Fast Fluidization,” Vol. 20, Advances in Chemical Engineering Series. San Diego: Academic Press(1994)

[7] Grace JR, Avidan AA, Knowlton TM, “Reactor Modeling and for High Velocity,” Eds. Circulating Fluidized Beds. London: Chapman and Hall(1997).

[8] Berruti F, Chaouki J, Godfroy L, Pugsley TS, Patience GS, Can. J. Chem. Eng., 73, 569 (1995)

[9] Li Y, Kwauk M, “The Dynamic of Fast Fluidization,” in Fluidization, eds., Grace, J. R., Masten, J. M., Plenum, New York, 537-544(1980).

[10] Hartge EU, Li Y, Werther J, “Analysis of the Local Structure of the Two Phase Flow in a Fast Fluidized Bed,” In CFB Tech., eds. by Basu, P. Pergamon Press, Canada, 153-160(1986).

[11] Kato K, Shibasaki H, Tamura K, Arita S, Wang C, Takarada T, J. Chem. Eng. Jpn., 22, 205 (1989)

[12] Kunii D, Levenspiel O, Powder Technol., 61, 193 (1990)

[13] Adanez J, Gayan P, Garcialabiano F, Dediego LF, Powder Technol., 81(3), 259 (1994)

[14] Lei H, Horio MJ, Chem. Eng. Japan, 31, 83 (1998)

[15] Bai D, Kato K, Powder Technol., 101(3), 183 (1999)

[16] Kunii D, Levenspiel O, Powder Technol., 84(1), 83 (1995)

[17] Kim SW, Kim SD, Lee DH, Ind. Eng. Chem. Res., 41(20), 4949 (2002)

[18] Brereton C, Stromberg L, Basu P(Ed), “Some Aspects of the Fluid Behavior of Fast Fluidized Beds,” CFB Tech., Pergamon, New York, p133(1986).

[19] Rhodes MJ, Geldart D, “The Hydrodynamics of Re-Circulating Fluidized Beds,” Ed by Basu P. CFB Techol., 193(1986).

[20] Pugsley T, Lapointe D, Hirschberg B, Werther J, Can J. Chem. Eng., 75, 1001 (1997)