Three-dimensional Numerical Simulation of Dense Gas-Solid Flow - in Circulating Fluidized Bed under Rolling Motion of Ship

摘要

To investigate the effects of ship motion on circulating fluidized beds (CFBs), three-dimensional numerical simulations of dense gas-solid flows have been carried out with a two-fluid model and its sub-models based on the kinetic theory of granular flows. In comparison with an upright CFB, a large number of solid particles accumulate in the lower part of the riser under the rolling and constantly inclined conditions, so that solid circulation flux Gs is reduced by more than approximately 70% under the present set of computational conditions. To determine the reason for the reduction of Gs, downward solid flux and the force of drag and gravity acting on the solid phase were evaluated in the riser of a constantly inclined CFB. Examination of the above quantities showed that in addition to the action of the gravity component perpendicular to the riser axis, the magnitude relation of the axial component of the drag and gravity forces mainly caused the reduction of the solid circulation flux in the present CFB under the inclined condition.