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

Chinese Journal of Chemical Engineering 2023年第4期56卷 203-214页

作者： Xia Xiong Zuohua Liu Changyuan Tao Yundong Wang Fangqin Cheng Hong Li School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing 400044China Department of Chemical Engineering Tsinghua UniversityBeijing 100084China Institute of Resources and Environment Engineering Shanxi UniversityTaiyuan 030006China Graduate School Chongqing UniversityChongqing 400044China

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.

关键词： Solid-liquid suspension Punched baffle Energy conservation flow field instability Effective fluxion

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