脉动流化床内颗粒分离行为的数值模拟  

Simulation of Segregation Behaviors of Binary Mixture in a Fluidized Bed with Pulsed Flow

作　　者：张晓光[1] ZHANG Xiao-guang(China Special Equipment Inspection and Research Institute, Beijing 100029, China)

机构地区：[1]中国特种设备检测研究院,北京100029

出　　处：《节能技术》2021年第1期50-53,共4页Energy Conservation Technology

摘　　要：脉动流化床可以实现多组分颗粒的分离而受到广泛关注。基于此,这里采用双流体模型,对脉动流化床多组分混合颗粒分离行为开展了数值模拟研究。通过与实验结果比较,模拟可以较好地预测颗粒的分离行为。比较了脉动流和连续流对分离行为的影响,结果表明,脉动流可以极大地促进颗粒的分离效率。同时评估了脉动频率和颗粒粒径的影响,研究发现,脉动频率的增大可以促进颗粒的分离效果,然而过高的频率会阻碍颗粒的分离。Pulsation-assisted fluidized beds can achieve the separation of multi-component particles,which has attracted more and more concerns.Based on this,the two-fluid model is employed to numerically investigate the segregation of binary mixture in pulsed fluidized bed.By a comparison with the experimental data,the model can give a good prediction.A comparison of pulsed flow and continuous flow is also conducted.The results reveal that the pulsed flow can greatly improve the segregation efficiency of particles.Meanwhile,the effects of pulsation frequency and particle size are evaluated.It is found that the increase of pulsation frequency can enhance the segregation degree.Whereas an excessive frequency will hinder the particle segregation.

关 键 词：脉动气流 流化床 分离 数值模拟 双流体模型 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]