Particle properties have significant effect on gas/solids flow characteristics

which results in significantly different force characteristics exerted in the internals immersed in fluidized beds of different particles. In this study

the dynamic force in a tested slat immersed in fluidized bed was measured by adhering strain gauges on its surface. The force characteristics of the slat were systematically compared in two beds of FCC catalyst particles (Geldart A) and silica sand particles (Geldart B). The experimental results showed that the RMS load density acting on the slat in the bed of Geldart B particles was about 2-3 times higher than in the bed of Geldart A particles. Except installed near the bottom distributor

the measured load density on the slat increased with increasing superficial gas velocity in both beds. However

the effect of the installation height of the slat indicated great difference in the two beds. The measured load density on the slat increased with increasing installation height in the bed with Geldart B particles

while it decreased firstly and then increased with increasing installation height in the Geldart A particles bed. At θ=75°-90°

the measured load densities decreased sharply with increasing inclination angle in both beds. However

at θ=0°-75°

the measured load density decreased slightly with increasing inclination angle in the bed of Geldart B particles

while there was no obvious change in the bed of Geldart A particles.