内置水平管的振动流化床中混合物的临界流化速度

Minimum Fluidization Velocity of Mixtures in a Vibration Fluidized Bed with Inner-Horizontal Tubes

在内置水平管的矩形振动流化床内研究了玉米粒和塑料珠混合物(Geldart D颗粒)中的流体力学性质。考察了颗粒质量分数、振动频率、振幅和内置水平管对混合颗粒的临界流化速度的影响。实验表明,振动的加入降低了混合物的临界流化速度。根据振动流化床的动力学特性,分析床层中颗粒受力情况,建立了混合颗粒物在振动流化床中临界流化速度的两类数学模型。通过实验数据建立两种模型的关联式所得的计算值和实验值误差控制在10%以内,吻合较好。

The hydrodynamics characteristics for the mixtures of mealie grains and plastic beads （Geldart D particles） in the vibration fluidized bed of 240 mm × 80 mm were researched. Effects of mealie grain mass fraction, vibration frequency and amplitude and inner-horizontal tubes on minimum fluidization velocity of the mixtures were investigated. The results showed that the minimum fluidization velocity of mixtures was decreased by vibration. Aeeording to the dynamical characteristic of the vibration fluidized bed （VFB）, force situation of partieles was analyzed to establish two kinds of mathematical model for mixtures in the vibration fluidized bed. The correlations based on two kinds of mathematical models to calculate minimum fluidization velocity were established according to experimental data, whose errors with the experimental results were well kept within 10%.