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Effect of Temperature on Fluidization of Geldart’s Group A and C Powders: Role of Interparticle Forces
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2017-10-27 00:00:00 , DOI: 10.1021/acs.iecr.7b03270 F. Raganati 1 , R. Chirone 1 , P. Ammendola 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2017-10-27 00:00:00 , DOI: 10.1021/acs.iecr.7b03270 F. Raganati 1 , R. Chirone 1 , P. Ammendola 1
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The interest in handling granular materials in a variety of industrial processes carried out at high temperature raises the question of how this variable affects the fluidization quality not only in the case of cohesive particles, belonging to Geldart’s C powders, but also of powders classified as A. The aim of this work is, therefore, to study, from both an experimental and phenomenological point of view, the effect of temperature on the fluidization of two different powders belonging to groups A and C of Geldart’s classification. In particular, fluidization tests were performed at different temperatures (20–800 °C) and using acoustic fields of different intensities (130–150 dB) and frequencies (50–200 Hz) to highlight the influence of interparticle forces (IPFs) on the fluidization quality with increasing temperature. Pressure drops and bed expansion curves were elaborated to show the influence of temperature on minimum fluidization velocity and size of fluidized particles. Then the validity of different correlations available in literature to predict the minimum fluidization velocity at high temperature was assessed. Finally, the experimental findings were interpreted from a phenomenological point of view on the basis of the cluster/subcluster model, which can account for temperature effects on both hydrodynamic and cohesive forces. In particular, the proposed model made it possible to directly evaluate IPFs, thus explaining the fluidization behavior of the powders on the basis of the intensification of their cohesiveness with increasing temperature.
中文翻译：
温度对Geldart A和C组粉末流化的影响：粒子间作用力的作用
对在高温下进行的各种工业过程中处理粒状材料的兴趣提出了一个问题，即不仅对于属于Geldart C粉末的粘性颗粒，而且对于分类为A的粉末，该变量如何影响流化质量。因此，这项工作的目的是从实验和现象学的角度研究温度对属于Geldart分类的A组和C组的两种不同粉末的流态化的影响。特别是，流化测试是在不同温度（20–800°C）和不同强度（130–150 dB）和频率（50–200 Hz）的声场下进行的，以突出粒子间力（IPFs）对粒子的影响。随着温度的升高流化质量。精心设计了压降和床膨胀曲线，以显示温度对最小流化速度和流化颗粒尺寸的影响。然后评估文献中可用于预测高温下最小流化速度的不同相关性的有效性。最后，根据现象学观点，基于簇/亚簇模型解释了实验结果，该模型可以解释温度对流体动力和内聚力的影响。特别地，所提出的模型使得直接评估IPF成为可能，从而基于随着温度升高而增强的内聚力来解释粉末的流化行为。
更新日期：2017-10-27
中文翻译：
温度对Geldart A和C组粉末流化的影响：粒子间作用力的作用
对在高温下进行的各种工业过程中处理粒状材料的兴趣提出了一个问题，即不仅对于属于Geldart C粉末的粘性颗粒，而且对于分类为A的粉末，该变量如何影响流化质量。因此，这项工作的目的是从实验和现象学的角度研究温度对属于Geldart分类的A组和C组的两种不同粉末的流态化的影响。特别是，流化测试是在不同温度（20–800°C）和不同强度（130–150 dB）和频率（50–200 Hz）的声场下进行的，以突出粒子间力（IPFs）对粒子的影响。随着温度的升高流化质量。精心设计了压降和床膨胀曲线，以显示温度对最小流化速度和流化颗粒尺寸的影响。然后评估文献中可用于预测高温下最小流化速度的不同相关性的有效性。最后，根据现象学观点，基于簇/亚簇模型解释了实验结果，该模型可以解释温度对流体动力和内聚力的影响。特别地，所提出的模型使得直接评估IPF成为可能，从而基于随着温度升高而增强的内聚力来解释粉末的流化行为。
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