Motion characteristics of binary solids in a liquid fluidised bed with inclined plates--颗粒学报PARTICUOLOGY

Li, Y., Qi, X., Li, N., Wang, A., Zhang, W., Zhu, R., & Peng, Z. (2018). Motion characteristics of binary solids in a liquid fluidised bed with inclined plates. Particuology, 39, 48-54. https://doi.org/10.1016/j.partic.2017.09.005

Motion characteristics of binary solids in a liquid fluidised bed with inclined plates

Yanfeng Li ^a *, Xiangqian Qi ^a, Ningbo Li ^a, Ai Wang ^b, Wenjun Zhang ^c, Rongtao Zhu ^a, Zhengbiao Peng ^b *

a Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
b Priority Research Centre for Frontier Energy Technologies & Utilization, Discipline of Chemical Engineering, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
c Key Laboratory of Coal-based CO2 Capture and Geological Storage, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

10.1016/j.partic.2017.09.005

Volume 39, August 2018, Pages 48-54

Received 3 April 2017, Revised 9 September 2017, Accepted 18 September 2017, Available online 1 January 2018, Version of Record 17 May 2018.

E-mail: lyf3344@126.com; zhengbiao.peng@newcastle.edu.au

Highlights

• A model of binary particle settling in modified fluidised bed with inclined channel was proposed.

• The model predicted particle settling lengths were in reasonable agreement with experimental data.

• The bed utilization factor and separation efficiency decreased with increasing the water velocity.

Abstract

Rectangular inclined channels prove promising for solid classification based on the principle of particle differential sedimentation. In the present work, we investigated the motion characteristics of binary solids in a modified fluidised bed (mFB) with inclined plates. We developed a theoretical model for the particle motion behaviour that accounts for the average solid volume fraction in the inclined channel and interactions between binary solids. The experimental system was designed to be consistent with the idealised theoretical arrangements to maximise the measurement accuracy. The experimental particles were mixtures of silica sand particles of sizes 425–710 μm and 710–880 μm, respectively. Specifically, we investigated the flow hydrodynamics of the binary suspension in terms of the settling length of both particle species and the bed expansion behaviour. We also analysed the utilisation factor and the separation efficiency of the mFB. The results showed that the average solid volume fraction in the inclined channel fluctuated slightly for a given total solid inventory. The utilisation factor and separation efficiency of the system decreased when increasing either the fluidisation velocity or the solid inventory. The prediction results were in good agreement with the experimental data with an absolute deviation of less than 15%.

Graphical abstract

Keywords

Inclined channel; Liquid–solid flow; Fluidised bed; Sedimentation; Fluidisation; Theoretical model

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