(686c) Hydrodynamic Behaviors of Sand Particles In a Large-Scale Triple Bed Combined Circulating Fluidized Bed

We have developed a triple-bed combined circulating fluidized bed (TBCFB) as a gasifier for advanced integrated coal gasification combined cycle (A-IGCC) or advanced integrated coal gasification fuel cell combined cycle (A-IGFC) systems to improve of thermal efficiency of coal-fired power plants. In this study, the effect of operating conditions in a gas-sealing bed (GSB) (Ф0.15 m×5.0 m) between a riser (Ф0.1 m×16.6 m) and a bubble fluidized bed (0.75 m×0.27 m×3.4 m) on flow behaviors of silica sand solids in a large-scale TBCFB cold model were investigated in order to achieve high flux and high density solids circulation. The solids mass flux (G_s) monotonically increased with the increase in gas velocity in the GSB. Further increase in GSB gas velocity decreased G_s.