Reduced power consumption in stirred vessel with high solid loading by equipping punched baffles

作     者：Xia Xiong Zuohua Liu Changyuan Tao Yundong Wang Fangqin Cheng Hong Li Xia Xiong;Zuohua Liu;Changyuan Tao;Yundong Wang;Fangqin Cheng;Hong Li

作者机构：School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China State Key Laboratory of Coal Mine Disaster Dynamics and ControlChongqing 400044China Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Institute of Resources and Environment EngineeringShanxi UniversityTaiyuan 030006China Graduate SchoolChongqing UniversityChongqing 400044China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2023年第56卷第4期

页      面：203-214页

核心收录：

学科分类：0710[理学-生物学] 080706[工学-化工过程机械] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (22078030, Z20200804) National Key Research and Development Program of China (2019YFC1905802) Key Project of Independent Research Project of State Key Laboratory of Coal Mine Disaster Dynamics and Control (2011DA105287zd201902) Hubei Three Gorges Laboratory Open/Innovation Fund (SK211009, SK215001) 

主　　题：Solid-liquid suspension Punched baffle Energy conservation Flow field instability Effective fluxion 

摘      要：Solid-liquid suspension in stirred tank is a common operation in the chemical industry. The power consumption, flow pattern and flow field instability of three systems named as unbaffled stirred tank, traditional baffled stirred tank and punched baffled stirred tank(Pun-BST) were studied by using the computational fluid dynamic analysis. Results showed that perforating holes in the baffles could reduce power consumption of mixing. Meanwhile, the punched baffle system could maintain the solids in suspension as traditional baffle system. The results also showed that the baffles could increase the “effective flow of stirred tank even though the whole velocity of the vessel is lower than un-baffled vessel. In addition, both the solid-liquid suspension and “effective flow were related to instability of the flow *** solid-liquid suspension results always along with obvious instability of the flow field. But, the strengthening effect of punched baffle on flow field instability mainly happened in the near-wall *** s because the collision and aggregation among sub-streams induced by holes intensified the unstable fluid flow. On the whole, the Pun-BST system provided much better mixing characteristics and recommended to apply in the industrial process.