TRANSIENT CHARACTERIZATION OF TYPE B PARTICLES IN A CIRCULATING FLUIDIZED BED RISER

摘要

Simple and rapid dynamic tests were used to evaluate fluid dynamic behavior of granular materials in the transport regime. Particles with densities ranging from 189 to 2,500 kg/m~3 and Sauter mean size from 61 to 812 Dm were tested in a 0.305 m diameter, 15.5 m height circulating fluidized bed (CFB) riser. The riser emptying time was linearly related to the Froude number in each of three operating regimes. The flow structure along the height of the riser followed a distinct pattern as tracked through differential pressures. These results are discussed to better understand the transformations that take place when operating over various regimes. The effects of pressure, particle size, and density on test performance are also presented.