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Influence of pressure on the minimum fluidization velocity

✍ Scribed by P.A. Olowson; A.E. Almstedt

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
394 KB
Volume
46
Category
Article
ISSN
0009-2509

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✦ Synopsis

The influence of pressure on minimum fluidization velocity has been measured in a pressurized fluid&d bed. Three different bed materials, corresponding to Geldart' s group B or group D particles, were investigated at pressures between 0.1 and 1.6 MPa. The onset of Auidization was determined both visually and by pressure drop measurements.

The results show a clear decrease in the minimum fluldizatlon velocity with increasing pressure. The experimental results are in good accord with results obtained using the Ergun equation.

A number of simplified correlations derived from the Ergun equation were also investigated. While many of these give a good description of the pressure effect, their accuracy varies significantly for ditrerent bed materials.

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Fig. 3. Expansion of beds of glass beads. A-Reference I, glass beads, 70 to 80 mesh; eSS N 0.66; h,, = 14.2 cm.; hi = 26 cm.; diameter of the column = 50 mm. B-Reference 3, glass beads, 20 to 25 mesh; ess = 0.40; h,, = 23.8 cm.; hi = 51.8 cm.; diameter of the column = 35 mm. -Piston flow. ----Comple