压力对流化床最小流化速度影响的冷态试验研究  

Influence of Pressure on Minimum Fluidization Velocity in a Fluidized Bed at Room Temperature

作　　者：李皓宇[1] 王彦彦[1] 王春波[1] 阎维平[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,河北保定071003

出　　处：《动力工程学报》2011年第6期416-420,431,共6页Journal of Chinese Society of Power Engineering

基　　金：国家高技术研究发展计划(863计划)专题课题(2009AA05Z310);教育部新世纪优秀人才支持计划(NCET-08-0770);中央高校基本科研业务费专项资金资助(10QX38)

摘　　要：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 study the influence of pressure on minimum fluidization velocity（Umf） in a bubbling fluidized bed with inner diameter of 90 mm,an experimental test has been performed,during which the minimum fluidization velocity of quartz and ceramic sand particles in different sizes were measured in the pressure range of 0.1-0.6 MPa.Results show that for ceramic sand particles,the Umf reduces with rising pressure rapidly at first and gently later on;whereas for quartz particles,the pressure effects little on the Umf.Based on Ergun equation and bed stress analysis,a formula for calculation of Umf is proposed,for which reasonable calculation steps are given.Calculation results indicate that the relative error between calculated and experimental data is within 10%.

关 键 词：增压流化床 压力 最小流化速度 厄贡方程 计算模型 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]