Spouting behaviour of binary mixtures in square-based spouted beds
作者机构：Department of Civil Chemical and Environmental Engineering (DICCA) University of Genova (UNIGE) Genova Italy Faculty of Science and Technology Free University of Bolzano (UNIBZ) Bolzano Italy Department of Applied Science and Technology (DISAT) Polytechnic University of Turin (POLITO) Turin Italy
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2019年第17卷第2期
页 面：193-201页
核心收录：
学科分类：0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）]
主 题：Spouted bed reactor Segregation Computational fluid dynamics
摘 要：From experime nts, the influe nee of the physical characteristics of different bin ary mixtures of solids on the spouting regime of a pyramidal square-based spouted bed reactor is assessed. The applied methodology permits a more precise evaluation of the effects of the tested variables (diameter, density, sphericity) on the response variables (minimum air flows at which spouting begins and at which to maintain spouting con ditions). The associated pressure drops along the bed of particles a nd the height of the formed fountai n are analysed in each case. During the initial stages of fluidisation, binary mixtures containing different density ratios show dead zones. Segregation becomes more evident at large-size and high-density ratios. The lack of sphericity was found to be the main reason leading to blocking, channelling, and start-up problems when system failures occur. Nevertheless, the extent of segregation in all cases decreases with increasing the spouting velocity. In addition, a computational fluid dynamic model based on the discrete element method, previously validated for a single solid bed, is proposed as a tool to predict and evaluate potential segregation phenomena in binary mixtures. This model reproduced with high accuracy the encountered segregation phenomena. Its use may help define the technical limts inherent in the pyramidal spouted bed reactor.
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