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在368mm×368mm的方形气固流化床中对FCC颗粒进行了流态化实验,基于对床内总体压力脉动信号分析了从鼓泡流态化到湍动流态化的转变速度Uc与静床高度H0及床层面位置H的关系.结果表明,床层截面位置H较低或静床高度H0增加都使Uc增加,即鼓泡流态化到湍动流态化的流型转变是由床层上部逐渐向下扩展的递进行为.基于这一观察,在原Uc预测模型的基础上引入床层截面平均颗粒浓度,建立了增加反映流型截面所在位置高度H变化和静床高度H0影响的流型转变速度预测模型,并结合实验数据拟合模型参数获得了相应关联式,预测结果与实验结果吻合良好.
The FCC particles were fluidized in a 368 mm × 368 mm square gas-solid fluidized bed. Based on the total pressure pulsation in the bed, the transition velocity Uc and static flow from bubbling fluidization to turbulent fluidization Bed height H0 and bed position H. The results show that Uc increases with lower bed cross-section height H or higher bed height H0, that is, the flow pattern transition from bubbling fluidization to turbulent fluidization is caused by Based on this observation, based on the original Uc prediction model, the average particle concentration in the section of the bed is introduced to establish the effect of increasing the height H and the height H0 of the bed, which reflect the position of the cross section of the flow pattern The model of predicting the velocity of flow transition was obtained, and the corresponding correlations were obtained by fitting the model parameters with the experimental data. The predicted results were in good agreement with the experimental results.