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

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

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

Full Length Article | Updated：2026-01-06

- Reduced power consumption in stirred vessel with high solid loading by equipping punched baffles
- Chinese Journal of Chemical Engineering Vol. 56, Issue 4, Pages: 203-214(2023)
- Affiliations：
  
  1. School of Chemistry and Chemical Engineering, Chongqing University,Chongqing,China,400044
  2. State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing,China,400044
  3. Department of Chemical Engineering, Tsinghua University,Beijing,China,100084
  4. Institute of Resources and Environment Engineering, Shanxi University,Taiyuan,China,030006
  5. Graduate School, Chongqing University,Chongqing,China,400044
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2023
- Accepted：
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Xia Xiong, Zuohua Liu, Changyuan Tao, Yundong Wang, Fangqin Cheng, Hong Li. Reduced power consumption in stirred vessel with high solid loading by equipping punched baffles[J]. Chinese Journal of Chemical Engineering, 2023, 56(4): 203-214.
DOI：

Xia Xiong, Zuohua Liu, Changyuan Tao, Yundong Wang, Fangqin Cheng, Hong Li. Reduced power consumption in stirred vessel with high solid loading by equipping punched baffles[J]. Chinese Journal of Chemical Engineering, 2023, 56(4): 203-214. DOI：

摘要

Abstract

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 field. Perfect 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 area. It’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.

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