Studies on solid mean residence time in a three-stage gas-solid fluidized bed with downcomer

Chitta Ranjan Mohanty; Bhim Charan Meikap

Korean Journal of Chemical Engineering, Vol.28, No.3, 969-973, March, 2011

DOI10.1007/s11814-010-0455-5 Export Citation

Studies on solid mean residence time in a three-stage gas-solid fluidized bed with downcomer

Chitta Ranjan Mohanty^{1, 2}, and Bhim Charan Meikap^{1, 3, †}

¹Department of Chemical Engineering, Indian Institute of Technology, Kharagpur 721301, India
²Department of Civil Engineering, Veer Surendra Sai University of Technology (VSSUT), Burla, Orissa, India
³School of Chemical Engineering, Faculty of Engineering, Howard College, University of Kwazulu-Natal, Durban 4041, South Africa

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Fluidized bed reactors behave as a continuously stirred tank reactor having wide residence time of solids, which is not desirable if a homogeneous product is required. The multi-stage fluidized bed reactors narrow the solids residence time, making it useful for various operations. A three-stage fluidized reactor was designed, fabricated and operated under stable operating condition to investigate the mean particle residence time in the system. The materials taken for the study were lime and sand. In the particle residence time experiments, the results revealed that at a particular solids velocity, mean residence time decreased with increase in gas velocity and increased with decrease in gas velocity. Based on the data, a correlation has been presented for predicting mean residence time.

Keywords:Multi-stage;Fluidization;Perforated Plates;Mean Residence Time;Downcomer

[References]

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[1] Mohanty C, Adapala S, Meikapa BC, Chem. Eng. J., 148(1), 115 (2009)

[2] Mohanty CR, Meikap BC, Chem. Eng. Proc.: Proc. Intens., 48, 2009 (2009)

[3] Mohanty CR, Malavia G, Meikap BC, Ind. Eng. Chem. Res., 48(3), 1629 (2009)

[4] Grace JR, Chem. Eng. Sci., 45, 1953 (1990)

[5] Overcashier R, Todd D, Olney R, AIChE J., 5, 54 (1959)

[6] Varma YBG, Powder Technol., 12, 167 (1975)

[7] Kersten SRA, Prins W, van der Drift B, van Swaaij WPM, Chem. Eng. Sci., 58(3-6), 725 (2003)

[8] Krishnaiah K, Varma YBG, Can. J. Chem. Eng., 60, 346 (1982)

[9] Kannan CS, Rao SS, Varma YB, Powder Technol., 78(3), 203 (1994)

[10] Pillay PS, Varma YBG, Powder Technol., 35, 223 (1983)

[11] Lin CL, Wey MY, Korean J. Chem. Eng., 22(1), 154 (2005)

[12] Brauer H, Muhle J, Schmidt M, Chem. Ing. Technol., 6, 494 (1970)