Abstract
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.
Similar content being viewed by others
References
C. R. Mohanty, S. Adapala and B. C. Meikap, Chem. Eng. J., 148, 115 (2009).
C. R. Mohanty and B. C. Meikap, Chem. Eng. Proc.: Proc. Intens., 48, 2009 (2009).
C. R. Mohanty, S. Adapala and B. C. Meikap, Ind. Eng. Chem. Res., 48, 1629 (2009).
J. R. Grace, Chem. Eng. Sci., 45, 1953 (1990).
R. Overcashier, D. Todd and R. Olney, AIChE J., 5, 54 (1959).
Y. B. G. Varma, Powder Technol., 12, 167 (1975).
S. R.A. Kersten, P. Wolter, B. van der Drift and W. P. M. van Swaaij, Chem. Eng. Sci., 58, 725 (2003).
K. Krishnaiah and Y. B. G. Varma, Can. J. Chem. Eng., 60, 346 (1982).
C. S. Kannan, S. S. Rao and Y. B.G. Varma, Powder Technol., 78, 203 (1994).
P. S. Pillay and Y. B.G. Varma, Powder Technol., 35, 223 (1983).
C. L. Lin and M.Y. Wey, Korean J. Chem. Eng., 22, 154 (2005).
H. Brauer, J. Muhle and M. Schmidt, Chem. Ing. Technol., 6, 494 (1970).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Mohanty, C.R., Meikap, B.C. Studies on solid mean residence time in a three-stage gas-solid fluidized bed with downcomer. Korean J. Chem. Eng. 28, 969–973 (2011). https://doi.org/10.1007/s11814-010-0455-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11814-010-0455-5