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Flow pattern transition characteristics in vibrated gas-solid fluidized bed of Geldart B magnetite powder using pressure drop signals analysis
Powder Technology ( IF 5.2 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.powtec.2017.12.089
Yadong Zhang , Yuemin Zhao , Liang Dong , Chenlong Duan , Enhui Zhou , Junyu Lu , Bo Zhang , Xuliang Yang

Abstract The vibrated gas-solid fluidized bed with the − 0.3 + 0.074 mm magnetite powder was utilized to study the flow pattern of bed and the effects of bubble motion on the fluidization characteristics. The results demonstrated that the standard deviation of the bed pressure fluctuation changed, as the gas velocity increased forming an inverted “U” shape plot. When the bed was in the bubbling fluidization mode, the bubbles were produced with a main frequency of 7.5 Hz and the pressure drop signal energy was high. When the bed was in a quasi-turbulent state, the bed mainly produced relatively smaller bubbles between 7.5 and 20 Hz in frequency and the pressure drop signal energy was low. As the vibration frequency increased, both the bed initiation bubbling velocity u1 and the onset velocity of turbulent fluidization u2, decreased. The values of Δu = u2 − u1, firstly increased and then gradually decreased with the increase of vibration frequency. Under the condition of vibration frequency f = 25 Hz and three different vibration amplitudes A (i.e., 1, 2 and 3 mm), the maximum values of Δu are 8.9 cm/s, 7.67 cm/s and 7.28 cm/s, respectively.

中文翻译:

基于压降信号分析的Geldart B磁铁矿粉体振动气固流化床流型转变特征

摘要 利用- 0.3 + 0.074 mm 磁铁矿粉振动气固流化床,研究床层流态和气泡运动对流化特性的影响。结果表明,床压波动的标准偏差随着气体速度的增加而变化,形成倒“U”形图。当床处于鼓泡流化模式时,气泡产生的主频率为 7.5 Hz,压降信号能量高。当床层处于准湍流状态时,床层主要产生频率在7.5-20Hz之间的相对较小的气泡,压降信号能量较低。随着振动频率的增加,床层起始鼓泡速度 u1 和湍流流化开始速度 u2 均降低。Δu = u2 − u1 的值随着振动频率的增加先增大后逐渐减小。在振动频率f = 25 Hz和三种不同的振幅A(即1、2和3 mm)条件下,Δu的最大值分别为8.9 cm/s、7.67 cm/s和7.28 cm/s。
更新日期:2018-03-01
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