This research was conducted in a cold flow circulating fluidized bed (CFB) having diameter and height of riser of 5 and 200 cm., respectively. The objective of this research is to study hydrodynamics of PVC particles. The PVC particles mean diameter was 140 micron while its density was 1,410 kg/m3. The superficial gas velocities used were in the range of 2.12 - 3.82 m/s and the measurement of particle velocity profiles was achieved by a high speed camera and image processing software. In part I, the effect of superficial gas velocity on flow patterns of PVC particles in riser, it was found that at superficial gas velocity 2.12 and 2.97 m/s, PVC particles flow patterns were in fast fluidization regime and in dilute transport regime at superficial gas velocity 3.82 m/s. PVC particles velocity existed a maximum at the center of the riser and gradually decreased toward the wall. When the superficial gas velocity and the height of riser increased, the velocity of PVC particles along radius increased. For fine powders such as PVC particles, the fluidization quality is poor due to adhesive, cohesive and static force. One of the effective ways to solve this problem was an addition of anti-static agent into the system. In Part II, the effect of anti-static agent on flow patterns of PVC particles in riser, it was found that the addition of anti-static agent displayed 2 advantages: 1) a reduced electrostatic force between PVC particles and the riser, and 2) slightly effect on the flow patterns of PVC particles.
