Numerical study of coarse coal particle breakage in pneumatic conveying--颗粒学报PARTICUOLOGY

Zhou, J., Liu, Y., Du, C., Liu, S., & Li, J. (2018). Numerical study of coarse coal particle breakage in pneumatic conveying. Particuology, 38, 204-214. https://doi.org/10.1016/j.partic.2017.07.003

Numerical study of coarse coal particle breakage in pneumatic conveying

Jiawei Zhou ^a *, Yu Liu ^b, Changlong Du ^a, Songyong Liu ^a, Jianping Li ^a

a School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
b School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

10.1016/j.partic.2017.07.003

Volume 38, June 2018, Pages 204-214

Received 13 September 2016, Revised 14 July 2017, Accepted 28 July 2017, Available online 20 November 2017, Version of Record 2 April 2018.

E-mail: zhoujw@hpu.edu.cn

Highlights

• The breakage of coarse coal particles was modeled using parallel-bond method.

• Correlations between total energy variation of particle cluster and breakage were analyzed.

• The degree of particle breakage differed with pipeline bending direction and swirling intensity.

Abstract

Pneumatic conveying of coarse coal particles with various pipeline configurations and swirling intensities was investigated using a coupled computational fluid dynamics and discrete element method. A particle cluster agglomerated by the parallel-bond method was modeled to analyze the breakage of coarse coal particles. The numerical parameters, simulation conditions, and simulation results were experimentally validated. On analyzing total energy variation in the agglomerate during the breakage process, the results showed that downward fluctuation of the total particle energy was correlated with particle and wall collisions, and particle breakage showed a positive correlation with the energy difference. The correlation between the total energy variation of a particle cluster and particle breakage was also analyzed. Particle integrity presented a fluctuating upward trend with pipe bend radius and increased with swirling number for most bend radii. The degree of particle breakage differed with pipeline bending direction and swirling intensity: in a horizontal bend, the bend radius and swirling intensity dominated the total energy variations; these effects were not observed in a vertical bend. The total energy of the particle cluster exiting a bend was generally positively correlated with the bend radius for all conditions and was independent of bending direction.

Graphical abstract

Keywords

Computational fluid dynamics–discrete element method; Pneumatic conveying; Pipeline configuration; Swirling intensity; Coarse coal particle; Breakage

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