Numerical investigation of separation efficiency of the cyclone with supercritical fluid

Li, Z., Tong, Z., Yu, A., Miao, H., Chu, K., Zhang, H., . . . Chen, J. (2022). Numerical investigation of separation efficiency of the cyclone with supercritical fluid–solid flow. Particuology, 62, 36-46. https://doi.org/10.1016/j.partic.2021.06.002

Numerical investigation of separation efficiency of the cyclone with supercritical fluid–solid flow

Zeyu Li ^{a b c}, Zhenbo Tong ^{a b *}, Aibing Yu ^{a b c}, Hao Miao ^c, Kaiwei Chu ^d, Hao Zhang ^e, Gang Guo ^a, Jiang Chen ^b

a School of Energy and Environment, Southeast University, Nanjing 210096, China
b Southeast University-Monash University Joint Research Institute, Suzhou, 215123, China
c Department of Chemical Engineering, Monash University, Clayton, Vic 3800, Australia
d School of Qilu Transportation, Shandong University, Jinan, 250002, China
e School of Metallurgy, Northeastern University, Shenyang, 110819, China

10.1016/j.partic.2021.06.002

Volume 62, March 2022, Pages 36-46

Received 28 January 2021, Revised 25 April 2021, Accepted 7 June 2021, Available online 24 June 2021, Version of Record 10 September 2021.

E-mail: z.tong@seu.edu.cn

Highlights

• Double inlet cyclone with dipleg performs better on cyclone performance.

• Mixing working fluid ratio remarkably affects the pressure drop.

• Presence of supercritical carbon dioxide negatively affects cyclone separation.

• Adding dustbin and dipleg apparently increases the particle residence time.

Abstract

The utilization of hydrogen is gaining increasing attention due to its high heating value and environmentally friendly combustion product. The supercritical water circulating fluidized bed reactor is a promising and potentially clean technology that can generate hydrogen from coal gasification. Cyclone is a vital part of the reactor which can separate incomplete decomposition of pulverized coal particles from mixed working fluid. This paper aims to gain in-depth understanding of the cyclone separation mechanisms under supercritical fluid by computational fluid dynamics (CFD). Although the amount of supercritical carbon dioxide in mixed working fluid is minor, it obviously influences the flow fields and separation efficiency of a cyclone. The simulation results suggest that both the decreasing content of supercritical carbon dioxide and adding the extra dipleg cause the promoting performance of cyclones. Research findings could refine the design of supercritical fluid–solid cyclones.

Graphical abstract

Keywords

Cyclone; Supercritical fluid–solid flow; Computational fluid dynamics

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