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• W1497295910 abstract "An experimental work is presented meant to clarify the specific role played by density differences between components in the segregating fluidization process of two-solid beds. The overall behaviour of such systems is characterized by substituting the traditional concept of “minimum fluidization velocity” of the binary mixture with the “velocity interval of fluidization” of the bed, which is limited by its “initial” and “final” fluidization velocity”. The dependence of these characteristic velocities on parameters such as component densities and mixture composition is illustrated by several series of experiments. The experimental results are analysed in the light of the fundamental theory, so as to establish quantitative relationships for their prediction. The evolution of the axial profile of component concentration at varying fluidization velocity is also discussed. INTRODUCTION A well-known feature of fluidized beds of different materials is the tendency of their particulate components to form stratified layers in response to the dragging action of the upflowing gas. Segregation is mainly driven by density or size differences among the particles that constitute the bed, two factors which act simultaneously when a charge of fully dissimilar solids is processed. Even with mixtures of only two solids predicting the equilibrium distribution of their components along the column height from the knowledge of particle properties, bed composition and fluidization velocity still constitutes a goal of the research in the field. To overcome these difficulties, a necessary step seems that of improving our present understanding of the fluidization process of two-component beds as well as that of the mutual dependence between fluidization and segregation of bed components. Because of the large number of variables involved in the phenomenology of segregating fluidization, a traditional method of investigation is that of dealing with binary systems in which only one of the two segregation factors, inequality of component density or size, is present. However, in comparison with the number of studies devoted to size segregating mixtures, much fewer are those focused on the fluidization properties of two-density beds and the specific influence of density differences on segregation. Besides the relative lack of information on this topic, an added difficulty is that connected with the impossibility of characterizing the 1 Formisani et al.: Fluidization Pattern of Density-Segregating Two-Solid Beds Published by ECI Digital Archives, 2007 FORMISANI, GIRIMONTE, LONGO 210 behaviour of binary fluidized beds with reference to their minimum fluidization velocity, a parameter shown to be devoid of any significance out of the field of monosolid fluidization (1). Therefore, on developing the approach first proposed by Chen and Keairns (2) and followed so far by a minority of authors (3-6), this paper looks at the actual nature of fluidization of two-density particle systems as that of a gradual process that has place along a whole velocity interval rather than at the critical velocity threshold umf typical of monodensity beds. On the pressure drop versus gas velocity diagram like that of Fig.1 the two boundaries of the velocity interval of fluidization are clearly identified: the “initial fluidization velocity” uif is that at which ∆p first deviates from the fixed bed line, while the “final fluidization velocity” uff is located where the ultimate value of ∆p, equal to the total bed weight per unit section, is first attained. 0 10 20 30 u , [cm/s]" @default.
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• W1497295910 title "The Fluidization Pattern of Density-Segregating Two-Solid Beds" @default.
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