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为进一步探明压力对流化床最小流化速度的影响,在内径90 mm的冷模加压鼓泡流化床试验装置上测量了不同粒径的石英砂和陶粒砂两类试验物料在压力0.1~0.6 MPa内的最小流化速度Umf.结果表明:对于陶粒砂颗粒,Umf随压力的增加明显减小,但减小的幅度逐渐变小;而对石英砂颗粒,压力对Umf影响较小.基于厄贡方程和床层受力分析,得到了最小流化速度的计算式,并给出了确定增压流化床最小流化速度的合理计算步骤.计算得出的预测值与试验值吻合较好,相对误差在10%以内.
In order to further ascertain the effect of pressure on the minimum fluidization velocity of the fluidized bed, two types of test materials, quartz sand and ceramsite with different particle sizes, were measured on a cold mold pressurized bubbling fluidized bed test device with an inner diameter of 90 mm The results show that the Umf decreases with increasing pressure but decreases gradually with the increase of pressure on the ceramsite sand grains, while the effect of pressure on the Umf The calculation formula of the minimum fluidization velocity is obtained based on the Ergun equation and the analysis of the bed stress, and a reasonable calculation procedure for determining the minimum fluidization velocity of the fluidized bed is given. The predicted values The experimental value is in good agreement, the relative error is less than 10%.