Experimental Study on the Solid Hold-up in the Fluidized Bed of a Riser-Fluidized Bed Combined Reactor
液固提升管-流化床组合反应器中流化床径向固含率分布的实验研究

The radial distributions of solid hold-up arc investigated in a cold model of a new type of liquid-solid fluidized bed reactor with 500 mm ID and 4000 mm in height of a riser-fluidized bed combined reactor. The influences of superficial liquid velocity and solids circulating rate on the radial hold-up distribution are also analyzed respectively, focusing on the most probably influential factors. The experimental results show that the whole bed can be divided into three distinct axial zones, distributor influencing zone, gradually developed zone and steadily fluidized zone. At the same time, in these three zones, the cross-sections of the liquid-solid fluidized bed can be characterized by two areas in radial direction, the central and annual areas. Moreover, the three-zone flow features of the liquid-solid fluidized bed and the spouted bed are also compared in detail.