柔性桨强化高黏度流体混合的能效分析  

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

作　　者：刘作华[1] 曾启琴[1] 王运东[2] 刘仁龙[1] 陶长元[1] 

机构地区：[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

出　　处：《化工学报》2013年第10期3620-3625,共6页CIESC Journal

基　　金：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)~~

摘　　要：搅拌混合操作广泛应用于化工、食品、冶金及环保等过程工业领域。搅拌槽内物料的}昆合程度及其功率消耗是影响产品质量和设备作业效率的关键因素。当物料黏度较高时，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 （Pv） and mixing performance between rigid Rushton turbine （RT） impeller and flexible RT impeller was analyzed with different flexible materials. The Pv of rigid and flexible impeller did not have significant difference at the same agitation speed （N= 60 r · min-1 , Pv = 340 W·m-3 of rigid, Pv=346 W · m-3 of flexible）. Good mixing performance could be obtained by flexible impeller at θ=2 min, while the isolated mixing regions of rigid impeller still existed until 0m = 30 min. The mixing performance number of flexible was minimum （Ce = 2.9 X 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.

关 键 词：搅拌槽 柔性桨 功率消耗 混合时间 混合效率 

分 类 号：TQ027.2[化学工程]