论文信息 - Fluidized bed granulation: gas flow, particle motion and moisture distribution

Fluidized bed granulation: gas flow, particle motion and moisture distribution

Abstract In fluidized bed granulation the liquid is often distributed by means of a two-fluid-nozzle that is positioned inside the bed. Then the wetting process takes place in the jet that is formed by the atomizing air. A model has been derived for a free jet to calculate the particle and gas velocities, the void fraction and the cross-sectional area of the jet. The results are compared with experimental data for the particle circulation time in the fluidized bed. Based on the particle and gas motion the liquid deposition is calculated, resulting in particle moisture distributions. The influence of different parameters on the moisture distribution and possible consequences on the granulation process are discussed.

E. Schlünder | Rolf-Dieter Becher | E.-U. Schlünder | R. Becher

[1] H. Martin. FLUID BED HEAT EXCHANGERS- A NEW MODEL FOR PARTICLE CONVECTION ENERGY TRANSFER , 1981 .

[2] A. Nienow. FLUIDISED BED GRANULATION AND COATING: APPLICATIONS TO MATERIALS, AGRICULTURE AND BIOTECHNOLOGY , 1995 .

[3] H. Uhlemann. Kontinuierliche Wirbelschicht‐Sprühgranulation , 1990 .

[4] P. Smith. A study of fluidised bed granulation , 1980 .

[5] Alvin W. Nienow,et al. Particle growth mechanisms in fluidised bed granulation—I: The effect of process variables , 1983 .

[6] K. B. Mathur,et al. An analysis of air and solid flow in a spouted wheat bed , 1959 .

[7] G A Lefroy,et al. THE MECHANICS OF SPOUTED BEDS , 1969 .

[8] Hans Rumpf,et al. Grundlagen und Methoden des Granulierens , 1958 .

[9] Fredrik Setterwall,et al. The coating of particles in a fluidized bed (residence time distribution in a system of two coupled perfect mixers) , 1989 .

[10] Fr. Loeffler,et al. Grundlagen der mechanischen Verfahrenstechnik , 1992 .

[11] Helmar Schubert,et al. Grundlagen des Agglomerierens , 1979 .

[12] G. Donsì,et al. The Dispersion of Axi-Symmetric Gas Jets in Fluidized Beds , 1980 .