多相催化颗粒在超临界水流化床中流化特性模拟研究

oal/Biomass gasification for producing hydrogen by supercritical water (SCW) fluidized bed is an efficient and clean way. In this paper，heterogeneous catalyst particles was used as bed materials and simulated in 3-dimension for the study of its fluidization characteristics in SCW. As the accuracy of TFM is poor, and the caculation resource demand of DPM is so huge that it cannot be competent for 3-demension simulation, a new numerical simulation method, CPFD, was applied to this study. Two kinds of aluminium oxide particles, with diameters of 0.3mm and 0.5mm, were investigated in this work. The simulation result shows that, though the two kinds of particle are categorized as Geldart B, a homogeneous expansion fluidization area is found in the range of the minimum fluidization velocity and the minimum bubbling fluidization velocity. What's more, as the particle diameter increases, the ratio of the two velocities above gets lower and the fluidized behavior becomes more like that of Group B. In homogeneous fluidization regime and double logarithmic coordinate, bed averaged voidage increases linearly with superficial velocity. Particle motion is mainly dominated by fluid phase and influenced by bubble vortice locally.