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Three-dimensional CFD simulation and experimental validation of particle segregation in CFB riser

Krishna Kant Dwivedi (Department of Mechanical Engineering, National Institute of Technology Durgapur, Durgapur, India)
Achintya Kumar Pramanick (Department of Mechanical Engineering, National Institute of Technology Durgapur, Durgapur, India)
Malay Kumar Karmakar (Energy Research and Technology Group, Central Mechanical Engineering Research Institute CSIR, Durgapur, India)
Pradip Kumar Chatterjee (Energy Research and Technology Group, Central Mechanical Engineering Research Institute CSIR, Durgapur, India)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 23 July 2020

Issue publication date: 19 March 2021

239

Abstract

Purpose

The purpose of this paper is to perform the computational fluid dynamics (CFD) simulation with experimental validation to investigate the particle segregation effect in abrupt and smooth shapes circulating fluidized bed (CFB) risers.

Design/methodology/approach

The experimental investigations were carried out in lab-scale CFB systems and the CFD simulations were performed by using commercial software BARRACUDA. Special attention was paid to investigate the gas-particle flow behavior at the top of the riser with three different superficial velocities, namely, 4, 6 and 7.7 m/s. Here, a CFD-based noble simulation approach called multi-phase particle in cell (MP-PIC) was used to investigate the effect of traditional drag models (Wen-Yu, Ergun, Wen-Yu-Ergun and Richardson-Davidson-Harrison) on particle flow characteristics in CFB riser.

Findings

Findings from the experimentations revealed that the increase in gas velocity leads to decrease the mixing index inside the riser. Moreover, the solid holdup found more in abrupt riser than smooth riser at the constant gas velocity. Despite the more experimental investigations, the findings with CFD simulations revealed that the MP-PIC approach, which was combined with different drag models could be more effective for the practical (industrial) design of CFB riser. Well agreement was found between the simulation and experimental outputs. The simulation work was compared with experimental data, which shows the good agreement (<4%).

Originality/value

The experimental and simulation study performed in this research study constitutes an easy-to-use with different drag coefficient. The proposed MP-PIC model is more effective for large particles fluidized bed, which can be helpful for further research on industrial gas-particle fluidized bed reactors. This study is expected to give throughout the analysis of CFB hydrodynamics with further exploration of overall fluidization.

Keywords

Acknowledgements

The authors are thankful to Director, CSIR-Central Mechanical Engineering Research Institute Durgapur and Director, National Institute of Technology Durgapur for their support to carry out this research work. Additionally, authors are also thankful to Dr Chanchal Loha, Principal Scientist, CSIR-CMERI Durgapur, and Dr Prabhansu, Assistant Professor, Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, India for their kind cooperation and support.

Declaration of interest statement: Author(s) confirms that there is no conflict of interest. The author(s) declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Citation

Dwivedi, K.K., Pramanick, A.K., Karmakar, M.K. and Chatterjee, P.K. (2021), "Three-dimensional CFD simulation and experimental validation of particle segregation in CFB riser", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 31 No. 4, pp. 1144-1171. https://doi.org/10.1108/HFF-04-2020-0197

Publisher

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Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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