振动流化床中浅床层时床层与分布板之间的弹性作用

Elastic Interaction Between the Bed and the Distributor in a Vibrated Fluidized Bed

采用A类颗粒作为实验粉体，通过测量床层对分布板的作用力，分析了振动流化床中分布板与床层的作用机理，提出了振动流化床中在浅床层共振时分布板与床层的弹性作用模型. 实验表明，分布板与床层之间是连续的弹性作用，周期性的机械振动通过分布板与床层之间的弹性作用以波动形式在床层中传播. 该模型计算结果与实验测定结果符合的较好.

Literature reported that the mechanism of the energy transfer from a vibration body to a bed in a vibrated fluidized bed (VFB) was collision between two bodies. The enhancement of particle motion in the bed resulted in improvement of fluidization behavior. In this paper, the force acted on the distributor by the bed is measured to analyze the interaction of the distributor and the bed in VFB. Continuous and elastic interaction between the distributor and the bed is revealed from the experimental analysis. An elastic interaction model is proposed: the energy of the periodical vibration is elastically transferred to the bed from the distributor and propagated in the elastic bed as wave. The wave propagation forms a shear force field and enhances the gas-solid contact in the bed. The calculated results from the elastic model of a uniform bed agree with the experimental results under the condition of resonance in a shallow bed.