Suspension quality and power consumption of the complex multiphase flow field in a draft-tube stirred reactor_中国颗粒学会

在线阅读

Volurnes 54-56 (2021)

Volurnes 48-53 (2020)

Volurnes 42-47 (2019)

Volurnes 36-41 (2018)

Volurnes 30-35 (2017)

Volurnes 24-29 (2016)

Volurnes 18-23 (2015)

Volurnes 12-17 (2014)

Volurne 11 (2013)

Volurne 10 (2012)

Volurne 9 (2011)

Volurne 8 (2010)

Volurne 7 (2009)

Volurne 6 (2008)

Volurne 5 (2007)

Volurne 4 (2006)

Volurne 3 (2005)

Volurne 2 (2004)

Volurne 1 (2003)

在线阅读

Partic. vol. 56 pp. 91-102 (June 2021)
doi: 10.1016/j.partic.2020.10.008

Suspension quality and power consumption of the complex multiphase flow field in a draft-tube stirred reactor

Licheng Wang*, Yanxing Tian, Yu Qi, Yiwei Gao, Mengya Wang

Show more

wangch586@email.tjut.edu.cn

Highlights

    • The liquid–solid–solid system in a draft-tube stirred reactor is investigated. • The CFD model is verified by the experimental concentration distribution. • The influence of the draft tube on the flow field is studied. • The suspension is evaluated using the concentration standard deviation. • Power consumption of a flow field with a draft tube is lower.

Abstract

Experiment and simulation were used to study the flow fields of a liquid–solid–solid three-phase system in a draft-tube stirred reactor with a six-flat-bladed turbine impeller (BT) and a 45° pitched six-bladed upflow turbine impeller (PBTU45). The computational fluid dynamics (CFD) formulation was based on a 3D Eulerian multi-fluid model along with a renormalization group (RNG) k-ε turbulence model, which took into account the inter-phase momentum exchange between different phases. The CFD model was validated using experimental data, and the suspension quality was validated by determining the standard deviation of the solid concentration. Good solid suspension was achieved in flow fields agitated by the BT impeller at low impeller speeds. The draft tube adversely affected solid dispersion at most impeller speeds. In flow fields agitated by the PBTU45 impeller, good solid suspension required a faster impeller speed. The suspension quality with the draft tube was better than that without the draft tube under most operating conditions. The power consumption of the BT or PBTU45 impeller with the draft tube was less than that without the draft tube at most impeller speeds.

Graphical abstract

Keywords

Liquid–solid–solid; Stirred reactor; Draft tube; Computational fluid dynamics; Power consumption; Suspension quality