Numerical simulation on gas-solid flow during circulating fluidized roasting of bauxite by a computational particle fluid dynamics method--颗粒学报PARTICUOLOGY

Xie, C., Li, R., Wei, Q., Liu, F., Zhao, H., Zhang, Y., & Sohn, H. Y. (2024). Numerical simulation on gas-solid flow during circulating fluidized roasting of bauxite by a computational particle fluid dynamics method. Particuology, 90, 179-188. https://doi.org/10.1016/j.partic.2023.12.007

Numerical simulation on gas-solid flow during circulating fluidized roasting of bauxite by a computational particle fluid dynamics method

Chengming Xie^{a b}, Rongbin Li ^{a b}, Qijin Wei ^c, Fengqin Liu ^{a b}, Hongliang Zhao ^{a b *}, Yongmin Zhang^d, Hong Yong Sohn ^e

a State Key Laboratory of Green and Low-carbon Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
b School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
c BGRIMM Technology Group, Beijing 100160, China
d State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China
e Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT 84112, USA

10.1016/j.partic.2023.12.007

Volume 90, July 2024, Pages 179-188

Received 24 October 2023, Revised 14 November 2023, Accepted 11 December 2023, Available online 22 December 2023, Version of Record 10 January 2024.

E-mail: zhaohl@ustb.edu.cn

Highlights

• A computational particle fluid dynamics simulation was performed to investigate a circulating fluidized bed roaster.

• Effect of the different secondary air positions on the gas–solid flow was explored.

• Effect of the different secondary air ratios on the gas–solid flow was explored.

• The optimal secondary air position and the secondary air ratio are obtained.

Abstract

A full-cycle numerical simulation of a circulating fluidized bed (CFB) by the use of the computational particle fluid dynamics (CPFD) method has been developed. The effects of the presence or absence of the secondary air, different secondary air positions, and different secondary air ratios on the gas–solid flow characteristics were explored. The results show that the presence of the secondary air makes a core-annular structure of the velocity distribution of particles in the fluidized bed, which enhances the uniformity of particles’ distribution and the stability of fluidization. The position and the ratio of the secondary air have a significant impact on the particle distribution, particle flow rate, and gas flow rate in the fluidized bed. When the secondary air position and ratio are optimal, the particles, particle flow rate, and air flow rate in the CFB are evenly distributed, the gas–solid flow state is good, and the CFB can operate stably.

Graphical abstract

Keywords

Circulating fluidized bed; CPFD method; Secondary air position; Secondary air ratio; Gas–solid flow characteristics

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