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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Flow pattern transition characteristics in vibrated gas-solid fluidized bed of Geldart B magnetite powder using pressure drop signals analysis
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Flow pattern transition characteristics in vibrated gas-solid fluidized bed of Geldart B magnetite powder using pressure drop signals analysis

机译：压力下降信号分析，Geldart B磁铁矿粉末振动气固流化床的流动模式转变特性

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摘要

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 u(1) and the onset velocity of turbulent fluidization u(2), decreased. The values of Delta u = u(2) - u(1), 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 Delta u are 8.9 cm/s, 7.67 cm/s and 7.28 cm/s, respectively. (C) 2017 Published by Elsevier B.V.
机译：利用振动的气体固体流化床 - 0.3 + 0.074mm磁铁矿粉末研究床的流动模式和气泡运动对流化特性的影响。结果表明，随着气体速度的增加，床压波动的标准偏差变为倒置的“U”形状图。当床在鼓泡流化模式时，使用7.5Hz的主频率产生气泡，压降信号能量高。当床处于准湍流状态时，床主要在7.5至20Hz之间产生相对较小的气泡，并且压降信号能量低。随着振动频率的增加，床起始鼓m速度U（1）都和湍流流化U（2）的起始速度降低。 ΔU= U（2） - U（1）的值，首先增加，然后随着振动频率的增加而逐渐降低。在振动频率f = 25Hz和三种不同振动幅度的条件下（即，1,2和3mm），ΔU的最大值分别为8.9cm / s，7.67cm / s和7.28cm / s 。 （c）2017年由Elsevier B.V发布。

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