固-液搅拌槽内桨型对颗粒悬浮特性影响的实验和模拟研究

摘要以水为液相，玻璃珠为固相，在固-液搅拌槽内比较了传统径向流Rushton桨、轴向流下推式45°六斜叶桨以及新型半折叶搅拌桨的功耗、泵送能力和对固体颗粒的悬浮效果。并应用CFD （Computational fluid dynamics）方法研究了不同搅拌桨操作下颗粒的轴向速度分布。结果表明：在相同转速下，Rushton桨的功耗最大，新型半折叶桨与下推式45°六斜叶桨的功耗接近；新型半折叶桨的流量准数最大，泵送能力最强；在固-液体系中，新型半折叶桨与下推式45°六斜叶桨的流型类似，但3种桨中新型半折叶桨对固体颗粒的悬浮效果最好。

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	王慧娜
	杜秀鑫
	段晓霞
	杨超

关键词：固-液搅拌槽；功耗；固体悬浮；半折叶桨； CFD

Abstract： The power consumption, pumping capacity and solids suspension characteristics with the novel Half-Folded turbine (HFT) were studied compared to the radial Rushton disk turbine (RDT) and 45° pitched blade turbine pumping down (PBTD) in a solid-liquid stirred tank. In the experiment, the water and glass spheres were selected as the liquid and solid phases, respectively. Meanwhile, the axial velocity distribution of the particles with different impeller types were predicted by computational fluid dynamics (CFD). It is found that the power consumption of RDT is the largest among three impellers. And for HFT, it is close to the power consumption of PBTD at the same rotational speeds. What’s more, compared to RDT and PBTD, HFT has the highest flow number and the strongest pumping capacity. In the solid-liquid system, the flow pattern of HFT is similar to that of PBTD. However, HFT shows the best performance of solids suspension among them.

Keywords： solid-liquid stirred tank； power consumption； solids suspension； Half-Folded turbine； computational fluid dynamics

Received 2019-10-24;

Fund:国家重点研发计划重点专项项目（2016YFB0301702）；国家自然科学基金（21808221；21938009）；中国科学院前沿科学重点研究项目（QYZDJ-SSW-JSC030）；中国科学院洁净能源创新院（DNL201902）。

Corresponding Authors: 段晓霞,E-mail:xxduan@ipe.ac.cn;杨超,chaoyang@ipe.ac.cn。 Email: xxduan@ipe.ac.cn;chaoyang@ipe.ac.cn

About author: 王慧娜(1996-),女,硕士研究生,研究方向为流体混合和剪切;杜秀鑫(1995-),男,硕士研究生,研究方向为液液混合和相间传质。

引用本文:

王慧娜, 杜秀鑫, 段晓霞, 杨超.固-液搅拌槽内桨型对颗粒悬浮特性影响的实验和模拟研究[J]. 化学工业与工程, 2020,37(2): 43-53

Wang Huina, Du Xiuxin, Duan Xiaoxia, Yang Chao.Experimental and CFD Study on Solids Suspension in a Solid-Liquid Stirred Tank With Different Impellers[J]. Chemcial Industry and Engineering, 2020,37(2): 43-53

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