Investigation of the segregation of a binary particle mixture in a square circulating fluidized bed with air staging--颗粒学报PARTICUOLOGY

Du, M., & Wang, S. (2019). Investigation of the segregation of a binary particle mixture in a square circulating fluidized bed with air staging. Particuology, 47, 70-76. https://doi.org/10.1016/j.partic.2019.07.002

Investigation of the segregation of a binary particle mixture in a square circulating fluidized bed with air staging

Mingkun Du ^a *, Shuai Wang ^b *

a Guangdong Institute of Special Equipment Inspection and Research, Zhuhai Inspection Institute, Zhuhai 519002, China
b School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

10.1016/j.partic.2019.07.002

Volume 47, December 2019, Pages 70-76

Received 14 March 2017, Revised 7 September 2017, Accepted 8 July 2019, Available online 4 September 2019, Version of Record 7 December 2019.

E-mail: dumk_zh@163.com; shuaiwang@hit.edu.cn; shuaiw@chalmers.se

Highlights

• Segregation of binary mixture in a square CFB is studied experimentally.

• Air staging hinders the separation of a binary mixture at the bottom of the bed.

• Radial segregation behavior of the mixture plays a significant role.

Abstract

To further understand the segregation characteristics of a binary particle mixture in a riser, the flow behaviors of particles with different sizes were experimentally and numerically investigated in a cold square circulating fluidized bed. The impact of the gas velocity, solid circulation rate, initial coarse particle fraction, and air staging on the coarse particle fraction and axial pressure drop were examined. The experimental results show that air staging can significantly promote the pressure drop of a binary mixture at the bottom of the bed compared with that of monosized particles. Meanwhile, the segregation of the binary mixture at the bottom is hindered. It was also found that there was clear radial segregation owing to a higher coarse particle fraction near the wall compared with the bed's center and its corner.

Graphical abstract

Keywords

Circulating fluidized bed; Binary mixture; Segregation; Air staging

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