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Mixing Patterns in Large-Scale Fluidized Beds

  • J. J. van Deemter

Abstract

A survey is given of experimental data on mixing in fluidized beds of small and large diameter. Two-phase theory is used to express mixing in terms of mass-transfer and dense phase eddy diffusivity.

Early unpublished information on the performance of commercial catalytic cracking regenerators is used to provide some approximate figures on the mixing behaviour of these units. Two other full scale reactors are analysed in a similar way.

A comparison between small and large fluidized beds shows that differences and similarities can probably be explained on the basis of flow regimes.

Keywords

Eddy Diffusivity Dense Phase Residence Time Distribution Turbulent Regime Superficial Velocity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Avedesian, M.M., 1974, Roasting Zinc Concentrate in Fluidized beds, Paper No. 5d, presented at the 24th annual Conf. of the C.S.Ch.E., Ottawa.Google Scholar
  2. Bohle, W. and van Swaay, W.P.M., 1978, Proc, 2nd Eng. Foundation Conference on Fluidization, 167.Google Scholar
  3. Catipovic, N.M., Jovanovic, G.N. and Fitzgerald, T.J., 1978, A.I.Ch.E. Journal, 24, 543.CrossRefGoogle Scholar
  4. Danckwerts, P.V., Jenkinsm J.W. and Place, G., 1954, Chem. Eng. Sci., 3, 26.Google Scholar
  5. Van Deemter, J.J., 1957, Shell Oil Co. Report.Google Scholar
  6. Van Deemter, J.J., 1961, Chem. Eng. Sci., 13, 143.Google Scholar
  7. Geldart, D., 1973, Powder Technol., 7, 285CrossRefGoogle Scholar
  8. De Groot, J.H., 1967, Proc. Intern. Symposium on Fluidization, Eindhoven, 782.Google Scholar
  9. Handlos, A.E., Kunstman, R.W. and Schissler, D.O., 1957, Ind. Eng. Chem., 49, 25.Google Scholar
  10. Jovanovic, G.N., Catipovic, N.M., Fitzgerald, T.J. and Levenspiel, 0., 1980, The Mixing of Tracer Gas in Fluidized Beds of Large Particles, Fluidization Conference, Henniker.Google Scholar
  11. Kolenko, T. and Collin, R., 1978, Proc. 2nd Eng. Foundation Conference on Fluidization, 246.Google Scholar
  12. May, W.G., 1959, Chem. Eng. Progress, 55, 49.Google Scholar
  13. Mutsers, S.M.P., 1979, Doctor’s Thesis, Techn. Univ. Eindhoven.Google Scholar
  14. Nguyen, H.V., Whitehead, A.B. and Potter, 0.E., 1978, Proc. 2nd Eng., Foundation Conference on Fluidization, 140.Google Scholar
  15. Rietema, K. and Mutsers, S.M.P., 1973, Proc. Intern. Symposium on Fluidization, Toulouse, 28.Google Scholar
  16. Rietema, K., 1979, Chem. Eng. Sci., 34, 571.Google Scholar
  17. Schügerl, K., 1967, Proc. Intern. Symposium on Fluidization, Eindhoven, 782.Google Scholar
  18. Van Swaay, W.P.M. and Zuiderweg, F.J., 1972, Proc. 5th Europ. Symposium on Chem. Reaction Eng., Amsterdam, B9 – 25.Google Scholar
  19. Van Swaay, W.P.M. and Zuiderweg, F.J., 1973, Proc. Intern. Symposium on Fluidization, Toulouse, 454.Google Scholar
  20. De Vries. R.J., van Swaay, W.P.M., Mantovani, C. and Heijkoop, A., 1972, Proc. 5th Europ. Symposium on Chem. Reaction Eng., Amsterdam, B9 – 59.Google Scholar
  21. Whitehead, A.B., Potter, 0.E., Nguyen, H.V. and Dent, D.C., 1980, Gas Backmixing in 0.61 m and 1.22 m square Fluidization Beds, Fluidization Conference, Henniker.Google Scholar
  22. Yerushalmi, J. and Squires, A.M., 1977, A.I.Ch.E. Symposium Series, No. 161, 44.Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • J. J. van Deemter
    • 1
  1. 1.Shell Internationale Research Mij. B.V.BussumThe Netherlands

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