J0510101 プロセス・トモグラフィー法を用いた揺動する循環流動層内の可視化計測と数値計算による評価

Abstract

Dynamic properties of particle distribution behaviors in the circulating fluidized bed with rolling motion have been clarified by both Electrical Capacitance Tomography (ECT) experiment and CFD-DEM simulation. A series of experimentals with a cold mode the rolling circulating fluidized bed is performed wihle the rolling amplitude and period varies. As a result, the particle distribution behavior at z'=300mm is dominated by the shear effect which is derived from the inertial forces and gravity in the radial direction of riser. Positive influence of rolling amplitude on the shear effect causes augmentation of particle volume fraction, but particle distribution becomes unstable and heterogeneous. Meanwhile, although the characteristic fluctuation frequency of particle volume fraction is dominated by the rolling period, little effect of the rolling period on the particle distribution behaviors can be recognized due to its little influence on the shear effect.