RADIAL SOLIDS FRACTION PROFILES IN INLET REGION OF HIGH-DENSITY CIRCULATING FLUIDIZED-BED

The radial solids fraction profiles in the inlet region of a high dens ity circulating fluidized bed (HDCFB) are studied by a dual-beam optic density sensor. Three kinds of inlet structures are employed to exami ne the axial developing process of the profiles. The acceleration effe ct of solids is analyzed by comparing the cross-sectional average soli ds fraction obtained by the density sensor and differential pressure m ethod. The results show that the radial, solids fraction profile is la rgely influenced by the inlet structure. The length for the inlet effe ct region is no more than 2.5 m above the air injection.