(303m) Heat Transfer and Flow Characteristics in Internally Circulating Fluidized Bed Lab-Scale and Pilot Scale Facilities

Heat transfer on a horizontal heat transfer tube is investigated in internally circulating fluidized beds(ICFB^®). Experiments were carried out both in lab-scale and pilot scale facilities. Heat transfer results are compared with results of PIV (Particle Image Velocimetry) analysis of particle movement around heated tube surfaces. In the circulating bed, the heat transfer coefficient was found to be lower than in a bubbling or turbulent fluidized bed. This can be explained from the PIV results which show that the degree of deterioration depends on the movement of particles around the heat transfer tube. Trends and values of heat transfer coefficient were almost the same for the lab-scale and pilot-scale facilities. The results indicate reasonable agreement between the lab-scale and pilot-scale facilities.