Abstract
In a circulating fluidized bed (7.8 cm-ID x 260 cm-high), flow regime of coal-air system at room temperature has been determined.
Bituminous coal particles used were either 0.73 mm or 1.03 mm in the mean diameter having density of 1400 Kg/m3.
The transition velocities from bubbling to turbulent beds and the transport velocities between turbulent and fast beds have been determined. The resulting transition velocities between bubbling and turbulent beds were 103 cm/s for 0.73 mm and 130 cm/s for 1.03 mm coal particles, respectively. The transport velocities between turbulent and fast beds were 180 and 209 cm/s for 0.73 and 1.03 mm particles, respectively.
In addition, chocking velocities were determined at different solid feeding rates. The resulting values were in the range of 2.55-2.65 m/s for 0.73 mm particle and of 2.77-2.84 m/s for 1.03 mm particle, respectively.
The published literature data of the transition velocity between bubbling and turbulent bed have been correlated with particle properties.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Avidan, A.A. and Yerushalmi, J.:Powder Technology,32, 223 (1982).
Cankurt, N.T. and Yerushalmi, J.:Fluidization,Cambridge Univ., Press, p. 387 (1978).
Capes, C.E. and Nakamura, K.:Can. J. Chem. Eng.,51, 31 (1973).
Lee, G.S., Han, G.Y. and Kim, S.D.: Korean J. Chem. Eng.,1, 71 (1984).
Lee, J.S. and Kim, S.D.:HWAHAK KONGHAK,20, 207 (1982).
Leung, L.S. and Wieles, R.J.:Ind. Eng. Chem. Proc. Des. Deo.,15, 552 (1976).
Leung, L.S. Wieles, R.J. and Nickiin, DJ.:Ind. Eng. Chem. Proc. Des. Dev.,10, 183 (1971).
Li, Y., Chen, B., Wang, F. and Guo, M.:Int. Chem. Eng.,21, 670(1981).
Nazemi, A.H., and Crouse, F.W.:Proc. of 2nd World Congress of Chem. Eng., Vol.III, 106 (1981).
Shin, B.C., Kon, Y.B. and Kim, S.D.:HWAHAK KONGHAK,22, 253, (1984).
Staub, F.W. and Canada, G.S.: in “Fluidization”, Davidson and Keairns, Ed., Cambridge Univ., Press, 339 (1978).
Van Swaaij, W.P.M., Burman, C. and Van Breugel, J.W.:Chem. Eng. Sci.,25, 1818(1970).
Weinstein, H., Melier, M., Shao, M.J. and Parisi, R.J.:AlChE Symp. Ser. 234, Vol.80, 52 (1984).
Wen, C.Y. and Yu, Y.H.:AIChE J.,12, 610 (1966).
Yerushalmi, J., Turner, D.H. and Squires, A.M.:Ind. Eng. Chem. Proc. Des. Dev. 15, 47 (1976).
Yerushalmi, J. and Cankurt, N.T.:Chemtech,10, 564 (1978).
Yerushalmi, J. and Squires, A.M.:AIChESyrnp. Ser. 73, 44(1975).
Yerushalmi, J. and Cankurt, N.T.:Powder Technology,24, 187(1979).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Han, G.Y., Lee, G.S. & Kim, S.D. Hydrodynamic characteristics of a circulating fluidized bed. Korean J. Chem. Eng. 2, 141–147 (1985). https://doi.org/10.1007/BF02697500
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02697500