Energy efficiency analysis for high-viscosity fluid mixing enhanced by flexible impeller

doi:10.3969/j.issn.0438-1157.2013.10.018

CIESC Journal ›› 2013, Vol. 64 ›› Issue (10): 3620-3625.DOI: 10.3969/j.issn.0438-1157.2013.10.018

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Energy efficiency analysis for high-viscosity fluid mixing enhanced by flexible impeller

LIU Zuohua¹, ZENG Qiqin¹, WANG Yundong², LIU Renlong¹, TAO Changyuan¹

1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2013-01-20 Revised:2013-06-14 Online:2013-10-05 Published:2013-10-05
Supported by:
supported by the National Basic Research Program of China(2012CBA01203),the Program for the New Century Excellent Talents in University(NCET-0552)and the State Key Laboratory of Chemical Engineering(SKL-ChE-12A02).

柔性桨强化高黏度流体混合的能效分析

刘作华¹, 曾启琴¹, 王运东², 刘仁龙¹, 陶长元¹

1. 重庆大学化学化工学院, 重庆 400044;
2. 清华大学化学工程系, 北京 100084

通讯作者: 刘作华(1973-),男,博士,副教授
作者简介:刘作华(1973-),男,博士,副教授。
基金资助:
国家重点基础研究发展计划项目(2012CBA01203);教育部新世纪优秀人才支持计划项目(NCET-0552);清华大学化学工程联合国家重点实验室开放课题(SKL-ChE-12A02)

Abstract

Abstract: The mixing performance of stirred tank is usually low for high-viscosity laminar flow mixing system.In order to intensify mixing performance,isolated mixing regions were experimentally destroyed by flexible impeller.Power consumption and mixing time were measured with viscous glycerin as working fluid,together with the shaft torque method and acid-alkali visualization technology.Comparison of power characteristics(P_V)and mixing performance between rigid Rushton turbine(RT)impeller and flexible RT impeller was analyzed with different flexible materials.The P_V of rigid and flexible impeller did not have significant difference at the same agitation speed(N=60 r·min^-1,P_V=340 W·m^-3 of rigid,P_V=346 W·m^-3 of flexible).Good mixing performance could be obtained by flexible impeller at θ_m=2 min,while the isolated mixing regions of rigid impeller still existed until θ_m=30 min.The mixing performance number of flexible was minimum(C_e=2.9×10⁶)and mixing performance was optimal at N=120 r·min^-1.Compared with the rigid impeller,mixing performance of silicone rubber flexible impeller was improved by 52.8%,and the mixing performance of PVC and rubber flexible impeller was improved by about 51.1%、50.5%,respectively.

Key words: stirred tank, flexible impeller, power consumption, mixing time, mixing performance

关键词: 搅拌槽, 柔性桨, 功率消耗, 混合时间, 混合效率

CLC Number:

TQ027.2

LIU Zuohua, ZENG Qiqin, WANG Yundong, LIU Renlong, TAO Changyuan. Energy efficiency analysis for high-viscosity fluid mixing enhanced by flexible impeller[J]. CIESC Journal, 2013, 64(10): 3620-3625.

刘作华, 曾启琴, 王运东, 刘仁龙, 陶长元. 柔性桨强化高黏度流体混合的能效分析[J]. 化工学报, 2013, 64(10): 3620-3625.

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Energy efficiency analysis for high-viscosity fluid mixing enhanced by flexible impeller

柔性桨强化高黏度流体混合的能效分析

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