THERMAL SCIENCE

International Scientific Journal

PRESSURE FLUCTUATIONS IN GAS FLUIDIZED BEDS

ABSTRACT
The pressure fluctuations in a fluidised bed are a result of the actions of the bubbles. However, the bubbles may be influenced by the air supply system and by the pressure drop of the air distributor. These interactions are treated for low as well as for high velocity beds by means of a simple model of the principal frequency of the pressure fluctuations. The model includes the interaction with the air supply system and describes qualitatively two important bubbling regimes: the single bubble regime, important for systems with low pressure drop air distributors, and the exploding bubble regime for high velocity beds.
KEYWORDS
PAPER SUBMITTED: 2002-08-12
PAPER REVISED: 2002-09-15
PAPER ACCEPTED: 2002-09-20
DOI REFERENCE: https://doi.org/10.2298/TSCI0202003L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2002, VOLUME 6, ISSUE 2, PAGES [3 - 11]
REFERENCES
  1. Andersson S., Johnsson F., Leckner B. (1989) Fluidization regimes in non-slugging fluidized beds, 10th Int. FBC Conference, Ed. A.M. Manaker, ASME, pp.239-247.
  2. Baird M.H., Klein A.L. (1973) Spontaneous oscillation of a gas-fluidised bed, Chem. Engn. Sci 28, 1039-1048.
  3. Baskakov A.P., Fillipovski N.F., Mydrechenko A.B. (1989) Influence of the volume of the sub-distributor chamber and resistance of the distributor on the character of fluidisation (In Russian), Izvestia Vuzov, Izdanye Beloryskovo Politeteknicheskovo Instituta, N1.
  4. Borodulya V.A., Zavyalov V.V., Buyevich Yu. A. (1985) Fluidized bed self-oscillations, Chem Eng. Sci. 40, 353-364.
  5. Davidson J.F. (1968) First session-Introduction by rapporteur, I.Chem.E. Symp. Series no 30 pp.3-11.
  6. Johnsson F., Vrager A., Leckner B. (1999) Solids flow pattern in the exit region of a CFB furnace- influence of exit geometry. 15th Int. FBC Conference, Ed R.B. Reuther, ASME, pp. 164-184.
  7. Johnsson F., Zijerveld R.C., Leckner B. (1997) Air-plenum pressure fluctuations in a circulating fluidised bed boiler, Proc. 2nd European Conference on Fluidization, Eds M. Olazar and M.J. San José, Bilbao, pp. 223-230.
  8. Leckner B., Golriz M., Zhang W., Andersson B.- Å., Johnsson F. (1991) Boundary layers- first measurements in a 12MW CFB research plant at Chalmers University, 11th Int. FBC Conference, Ed E.J. Anthony, ASME, pp. 771-776.
  9. Moritomi H., Mori S., Araki K., Moriyama A. (1980) Periodic pressure fluctuation in a gaseous fluidised bed, Kagaku Kogaku Ronbunshu 6, 392-396.
  10. Svensson A., Johnsson F., Leckner B. (1996a) Bottom bed regimes in a circulating fluidised bed boiler, Int. J. Mulitphase Flow 22, 1187-1204.
  11. Svensson A., Johnsson F., Leckner B. (1996b) Fluidization regimes in non-slugging fluidised beds: 3the influence of pressure drop across the air distributor, Powder Technology 86, 299-312.

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence