几种单层桨搅拌槽内宏观混合特性的比较

doi:10.11949/j.issn.0438-1157.20180948

化工学报 ›› 2019, Vol. 70 ›› Issue (1): 32-38.DOI: 10.11949/j.issn.0438-1157.20180948

几种单层桨搅拌槽内宏观混合特性的比较

李挺^1,²(),贾卓泰²(),张庆华²(),杨超²,毛在砂²

1. 山东大学化学与化工学院，山东济南 250100
2. 中国科学院过程工程研究所，中国科学院绿色过程与工程重点实验室，北京 100190

收稿日期:2018-08-22 修回日期:2018-10-19 出版日期:2019-01-05 发布日期:2019-01-05
通讯作者: 张庆华
作者简介:李挺（1992—），男，硕士研究生，<email>849495015@qq.com</email>；贾卓泰（1995—），男，硕士研究生，<email>jzt40107@163.com</email>|李挺（1992—），男，硕士研究生，<email>849495015@qq.com</email>；贾卓泰（1995—），男，硕士研究生，<email>jzt40107@163.com</email>|张庆华（1980—），男，博士，副研究员，<email>qhzhang@ipe.ac.cn</email>
基金资助:
国家重点研发计划重点专项项目(2016YFB0301701);国家自然科学基金项目(21427814, 21776282);中国科学院前沿科学重点研究项目(QYZDJ-SSW-JSC030);国家重点研发计划重点专项项目（2016YFB0301701）；国家自然科学基金项目（21427814, 21776282）；中国科学院前沿科学重点研究项目（QYZDJ-SSW-JSC030）

Comparison of macro-mixing characteristics of a stirred tank with different impellers

Ting LI^1,²(),Zhuotai JIA²(),Qinghua ZHANG²(),Chao YANG²,Zaisha MAO²

1. College of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China
2. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2018-08-22 Revised:2018-10-19 Online:2019-01-05 Published:2019-01-05
Contact: Qinghua ZHANG

摘要/Abstract

摘要：

为了丰富对向心桨的混合特性的认识，比较了向心桨、Rushton桨、三斜叶桨和穿流桨的单层桨搅拌槽内的宏观混合特性，考察了搅拌转速、桨叶离底高度对搅拌槽混合时间和功率特性的影响。结果表明，四种桨的宏观混合时间均随着搅拌转速的增加而减少，搅拌功率均随转速的增加逐渐增大。当转速相同时，四种桨型中Rushton桨的功率消耗最大，三斜叶桨功率消耗最小，向心桨的功率消耗仅仅比三斜叶桨高。桨叶离底高度的变化对四种桨型的混合时间和功率的影响不尽相同。混合效率的影响因素大小顺序为：搅拌转速>桨型>桨叶离底高度。在考察的四种桨型中，向心桨的混合效率最高。研究成果可为向心桨等新型搅拌桨的工业应用积累实验数据，为其优化设计和放大提供理论依据。

关键词: 搅拌容器, 向心桨, 混合, 功率, 混合效率, 优化设计

Abstract:

In order to enrich the data of centripetal impeller performance, the macro-mixing characteristics of stirred tanks installed with centripetal impeller, Rushton impeller, three pitched blade impeller and punched blade impeller were systematically studied. The influence of impeller speed, impeller off-bottom clearance, impeller type on mixing time, power and mixing efficiency of the stirred tank was investigated. The results show that the mixing time of the four impellers are all decreased with increasing impeller speed, and the power are all increased. At the same impeller speed, the power of the Rushton impeller is the highest, and the three pitched blade impeller is the lowest. The power of centripetal impeller is only a little higher than that of the three pitched blade impeller. However, the macro-mixing time of the four impellers shows different trends with increasing the impeller off-bottom clearance. The importance of the factor affecting the macro-mixing efficiency is impeller speed >impeller type > impeller off-bottom clearance. Among the four impellers, the overall evaluation of the macro-mixing efficiency of the centripetal impeller is the highest. The research results of this paper can accumulate experimental data for the industrial application of new impellers such as centripetal impeller, and provide theoretical basis for its optimization design and scale-up.

Key words: stirred vessel, centripetal impeller, mixing, power, mixing efficiency, optimal design

中图分类号:

TQ 028.8

李挺, 贾卓泰, 张庆华, 杨超, 毛在砂. 几种单层桨搅拌槽内宏观混合特性的比较[J]. 化工学报, 2019, 70(1): 32-38.

Ting LI, Zhuotai JIA, Qinghua ZHANG, Chao YANG, Zaisha MAO. Comparison of macro-mixing characteristics of a stirred tank with different impellers[J]. CIESC Journal, 2019, 70(1): 32-38.

图/表 11

图1 实验装置

Fig.1 Experimental setup

图2 四种搅拌桨结构

Fig.2 Structure of four impellers

图3 转速对不同构型搅拌桨混合时间的影响

Fig.3 Effect of impeller speed on mixing time

图4 转速对功率的影响

Fig.4 Effect of impeller speed on power

图5 转速对功率准数的影响

Fig.5 Effect of impeller speed on power number

图6 搅拌转速与单位体积混合能关系

Fig.6 Correlation between impeller speed and WV

图7 桨叶离底高度对混合时间的影响

Fig.7 Effect of impeller clearance on mixing time

图8 桨叶离底高度对功率的影响

Fig.8 Effect of impeller clearance on power

图9 桨叶离底高度对功率准数的影响

Fig.9 Effect of impeller clearance on power number

图10 桨叶离底高度对单位体积混合能的影响

Fig.10 Correlation between impeller clearance and WV

图11 混合时间与单位体积功耗关系

Fig.11 Correlation between mixing time and PV

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几种单层桨搅拌槽内宏观混合特性的比较

Comparison of macro-mixing characteristics of a stirred tank with different impellers

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