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基于EMMS模型、耦合双流体模型对内置隔板流化床内气固两相流动规律进行研究,包含流化床内气固两相的速度分布规律、固相颗粒体积分数分布规律、粒径对固相颗粒体积分数分布的影响规律等内容。结果表明:流化床内存在固体颗粒的返混现象,多个隔板的存在增强流化床内的返混现象;局部固相颗粒体积分数较高,表明固体颗粒发生了团聚现象;固相颗粒体积分数呈现出“上稀下浓”和,“核稀边密”的分布规律,且在高度方向的变化规律呈现出“S”曲线;随着颗粒粒径的减小,被气体携带进入高度h=0.1~0.4 m区域的固体颗粒增多。研究结果可为深入理解内置隔板流化床内磁化焙烧过程中气固两相流动规律提供理论指导。
Based on the EMMS model and the coupled two-fluid model, the gas-solid two-phase flow in a fluidized bed with a built-in clapboard was studied. The velocity distribution of gas-solid two phases in the fluidized bed, the volume fraction distribution of solid particles, The influence law of volume fraction distribution of solid particles and so on. The results show that there is the phenomenon of backmixing of solid particles in the fluidized bed, the presence of multiple partitions enhances the backmixing phenomenon in the fluidized bed, the high volume fraction of local solid particles indicates that the solid particles agglomerate, the solid phase Particle volume fraction showed a distribution pattern of “thin and thin ” and “nuclide dense ”, and the “S ” curve showed a “S ” curve in the height direction. The amount of solid particles carried by the gas into the area of height h = 0.1-0.4 m is small. The results can provide theoretical guidance for the further understanding of the gas-solid two-phase flow in the magnetization roasting process of the built-in baffle fluidized bed.