Particle holdup in a fast fluidized bed

Particle holdup and axial pressure drop in a fast fluidized bed were measured. In a fast fluidized bed, there is a dense region of particles in the lower part of the bed and a dilute region of particles in the upper part of the bed. The height of the inflection point between the dense region of particles and the dilute region of particles was determined by an axial pressure drop profile. Its location was affected by the superficial gas velocity, the circulation rate of particles and the particle Reynolds number. An empirical equation for the location of the inflection point was obtained. Particle holdup in a fast fluidized bed was affected by superficial gas velocity, circulation rate of particles, particle Reynolds number, tube diameter, location of the inflection point and axial distance from the distributor. An empirical equation for particle holdup in a fast fluidized bed was obtained.