Effect of Particle Density on the Hydrodynamic Behavior of a Gas-Solid Fluidized Bed

摘要

In this work the effect of particle density was analyzed using two different types of materials, Canadian Hematite and glass beads with densities of 4989 kg/m~3 and 2230 kg/m~3, respectively. Both of these materials were used in a gas-solid bed and the hydrodynamic behavior of the bed analyzed. For each material two sets of particles were created. One set of particles ranged in size from 90 to 425 yon and another from 125 to 300 μm. The 90 to 425 μm particles were mixed maintaining a specific composition presented later in this paper. For the 125 to 300 μm range the same amount of particles were mixed according to the weight percentage of each size range. Pressure drop of the bed was taken using a differential manometer. For the Hematite particle size range of 90 to 425 μm the pressure drop measured across the bed at minimum fluidization was 785 Pa. For these same conditions using the glass beads the pressure drop was measured to be 420 Pa, significantly lower than those for Hematite. This same trend was also observed for the 125-300 μm particle range for the same bed height. Using the second set of particles pressure drop at minimum fluidization for Hematite and glass beads was 981 Pa and 412 Pa, respectively. Various other measurements taken at different bed heights showed that the Hematite pressure drop was significantly higher than when using glass beads. Other results presented in this paper show that both pressure drop and minimum fluidization are significantly impacted by the increase of the material density.