Design of impeller blades for efficient homogeneity of solid-liquid suspension in a stirred tank reactor
Design of impeller blades for efficient homogeneity of solid-liquid suspension in a stirred tank reactor
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搅拌釜反应器中固液悬浮液有效均匀化的叶轮叶片设计
DOI：
10.1016/j.apt.2017.06.027
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发表时间：
2017-10-01
影响因子：
5.2
通讯作者：
Wang, Yundong
中科院分区：
文献类型：
--
作者：
Gu, Deyin;Liu, Zuohua;Wang, Yundong
采用计算流体力学（CFD）方法对刚性桨、刚-柔桨和穿孔刚-柔桨搅拌槽内固-液悬浮过程的流体力学特性进行了研究。考察了搅拌桨类型、搅拌桨转速、柔性连接件长度、搅拌桨间距、颗粒粒径、孔径/孔径比等因素对混合质量的影响。结果表明，搅拌桨转速越高，固液均匀度越高。长柔性连接件有利于固体颗粒悬浮过程。桨距过小时，固体颗粒不能获得足够的动量悬浮到搅拌槽的上部区域。较大的颗粒尺寸导致固体颗粒的不均匀分布。对于固体颗粒悬浮过程，穿孔式刚-柔桨的最佳开孔率和孔径分别为12%和8 mm。结果表明，在相同的功率消耗下，穿孔式刚-柔组合桨比刚性桨和刚-柔组合桨更有利于固体颗粒的悬浮。在相同转速下，冲切式刚-柔混合桨比刚性桨和刚-柔混合桨消耗更少的桨功率。(C)2017年日本粉末技术学会。由Elsevier B.V.和日本粉末技术协会出版。All rights reserved.
Computational fluid dynamics (CFD) was used to investigate the hydrodynamics of solid-liquid suspension process in a stirred tank with rigid impellers, rigid-flexible impellers and punched rigid-flexible impellers. The effects of impeller type, impeller speed, flexible connection piece length, impeller spacing, particle size, and aperture size/ratio on the mixing quality were investigated. Results showed that the degree of solid-liquid homogeneity increased with an increase in impeller speed. A long flexible connection piece was conductive to solid particles suspension process. The solid particles could not obtain enough momentum to suspend to the upper region of stirred tank with small impeller spacing. Larger particle size resulted in less homogenous distribution of solid particles. The optimum aperture ratio and aperture diameter of punched rigid-flexible impeller were 12% and 8 mm, respectively, for solid particles suspension process. It was found that punched rigid-flexible impeller was more efficient in suspending solid particles compared with rigid impeller and rigid-flexible impeller at the same power consumption. In addition, less impeller power was consumed by punched rigid-flexible impeller compared with rigid impeller and rigid-flexible impeller at the same impeller speed. (C) 2017 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.