Simulation with a structure-based mass-transfer model for turbulent fluidized beds--颗粒学报PARTICUOLOGY

Yan, D., Li, H., Zou, Z., & Zhu, Q. (2018). Simulation with a structure-based mass-transfer model for turbulent fluidized beds. Particuology, 39, 40-47. https://doi.org/10.1016/j.partic.2017.09.003

Simulation with a structure-based mass-transfer model for turbulent fluidized beds

Dong Yan ^{a b}, Hongzhong Li ^a *, Zheng Zou ^a, Qingshan Zhu ^{a b *}

a State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100190, PR China
b University of Chinese Academy of Sciences, Beijing 100049, PR China

10.1016/j.partic.2017.09.003

Volume 39, August 2018, Pages 40-47

Received 17 July 2017, Revised 27 August 2017, Accepted 19 September 2017, Available online 26 December 2017, Version of Record 17 May 2018.

E-mail: hzli@ipe.ac.cn; qszhu@ipe.ac.cn

Highlights

• A structure-based mass transfer model for turbulent fluidized beds was established.

• The simulation results were favorably validated with the experimental data.

• The component concentration was closely related to the presence of the catalyst.

• The interphase mass transfer acted as the limiting step for the entire system.

Abstract

A structure-based mass-transfer model for turbulent fluidized beds (TFBs) was established according to mass conservation and the balance of mass transfer and reaction. Unlike the traditional method, which assumes a homogeneous structure, this model considered the presence of voids and particle clusters in TFBs and built correlations for each phase. The flow parameters were solved based on a previously proposed structure-based drag model. The catalytic combustion of methane at three temperatures and ozone decomposition at various gas velocities were used to validate the model. The TFB reactions comprised intrinsic reaction kinetics, internal diffusion, and external diffusion. The simulation results, which compared favorably with experimental data and were better than those based on the average method, demonstrated that methane was primarily consumed at the bottom of the bed and the methane concentration was closely related to the presence of the catalyst. The flow and diffusion had an important effect on the methane concentration. This model also predicted the outlet concentrations for ozone decomposition, which increased with increasing gas velocity. Interphase mass transfer was presented as the limiting step for this system. This structure-based mass-transfer model is important for the industrial application of TFBs.

Graphical abstract

Keywords

Mass transfer; Simulation; Turbulent fluidized bed; Structure-based

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