【摘要】 流化催化裂化(FCC)在重油轻质化过程中占有重要地位,掌握气固流化床内流动特性对FCC装置的合理设计有一定指导作用。采用Brandani S和Zhang K的模型,在商业化CFD软件包CFX 4.4平台上模拟了宽为0.25 m和高0.70 m的二维流化床中粒径为6.4×10-5m和密度为1 225 kg/m3的FCC颗粒不同表观气速下的散式或聚式流态化特性,所得结果与前人的实验测量和理论预报相吻合。更多还原

【Abstract】 Fluid catalytic cracking(FCC) plays an important role in the processes of the heavy oil refining industry.A thoroughly understanding of fluid characteristics in the gas-solid fluidized beds is helpful for designing the FCC units.A new two-fluid model developed by Brandani S and Zhang K is used to numerically investigate the hydrodynamics of FCC particles in the platform of CFX 4.4,a commercial CFD software package.Simulation is carried out in a two-dimensional fluidized bed with 0.25 m in width and 0.70 m in height.The particle with a diameter of 6.4×10-5m and a density of 1 225 kg/m3 is employed as solid phase.Two typical kinds of fluid dynamics,i.e.,homogeneous fluidization and aggregative fluidization,are obtained under corresponding to superficial gas velocities,which are in good agreement with classical theories as well as experimental dates from the literatures.更多还原