Slugging Behavior of Geldart D Particles in a Vibrated Gas-Fluidized Bed
Slugging Behavior of Geldart D Particles in a Vibrated Gas-Fluidized Bed
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DOI：
10.1080/02726351.2014.913750
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发表时间：
2014-04
影响因子：
2.5
通讯作者：
Xuliang Yang;Zhijie Fu;Yuemin Zhao
中科院分区：
文献类型：
--
作者：
Xuliang Yang;Zhijie Fu;Yuemin Zhao
GeldartD颗粒在振动流化床（VFB）中的周期性段塞运动有利于颗粒分层过程的应用，特别是粉煤在VFB中的流化。对GeldartD颗粒VFB中段塞的形成、段塞的聚并与增长、段塞上升速度和段塞频率进行系统的研究具有重要意义。在理论分析的基础上建立了段塞形成模型，并指出振动幅值、振动频率和空塔风速对段塞流行为均有显著影响。段塞形成初期段塞高度的预测值与实测值的对比表明，段塞形成模型具有较高的预测精度。定性研究了气泡聚并成相邻段塞的动力学过程，建立了段塞高度和段塞上升速度的关联式。结果表明，随着过剩流化风速和段塞位置高度的增加，段塞高度增加，段塞上升速度随段塞高度的增加呈指数增长。实验结果还表明，段塞流频率与表观风速无关。
The periodic slugging behavior of Geldart D particles in a vibrated gas-fluidized bed (VFB) is favorable for some applications involving the processes of particles stratification, especially for fine coal beneficiation in a VFB. It is of great significance to conduct systematic studies on slug formation, slug coalescence and growth, slug rising velocity, and slugging frequency in a VFB of Geldart D particles. The slug formation model is proposed based on theoretical analysis and indicates that the vibration amplitude, the vibration frequency, and the superficial air velocity all have significant effects on the slugging behavior. Also, the comparison of predicted values and measured values of the slug height at its initial formation verifies that the slug formation model has high prediction accuracy. The dynamic of the coalescence of bubbles into an adjacent slug is qualitatively studied and the correlations of the slug height and the slug rising velocity are established, respectively. The results show that the slug height increases with the excess fluidizing air velocity and the height of slug location, and the slug rising velocity performs an exponential growth with the increase of slug height. The results also show that the slugging frequency is independent on the superficial air velocity.