Fluidization stability and periodic fluctuations in gas–solid separation fluidized bed using Geldart A dense medium--颗粒学报PARTICUOLOGY

Liu, W., Wang, D., Dong, L., Zhou, E., Aleksandrova, T., Zhou, C., & Duan, C. (2024). Fluidization stability and periodic fluctuations in gas–solid separation fluidized bed using Geldart A dense medium. Particuology, 90, 522-534. https://doi.org/10.1016/j.partic.2024.02.002

Fluidization stability and periodic fluctuations in gas–solid separation fluidized bed using Geldart A dense medium

Weijin Liu ^{a b}, Dan Wang^{a b}, Liang Dong ^{a b}, Enhui Zhou^{a b}, Tatiana Aleksandrova ^d, Chenyang Zhou ^{a b c *}, Chenlong Duan ^{a b *}

a Key Laboratory of Coal Processing and Efficient Utilization (China University of Mining &Technology), Ministry of Education, Xuzhou 221116, China
b School of Chemical Engineering & Technology, China University of Mining & Technology, Xuzhou 221116, China
c Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario N6A 5B9, Canada
d Mineral Processing Department, Saint Petersburg Mining University, St. Petersburg 199106, Russia

10.1016/j.partic.2024.02.002

Volume 90, July 2024, Pages 522-534

Received 8 December 2023, Revised 31 January 2024, Accepted 1 February 2024, Available online 8 February 2024, Version of Record 23 February 2024.

E-mail: zhoucy@cumt.edu.cn; clduan@cumt.edu.cn

Highlights

• Characteristics of pressure fluctuations in gas–solid fluidized bed after introduction of Geldart A particles were studied.

• Relationship between emulsified phase, bubble phase, and bed pressure fluctuation stability was explained.

• Established a prediction model for the main frequency of pressure fluctuations before bubbling fluidization.

Abstract

Gas–solid separation fluidized bed is a typical method for coal separation without water utilization. Geldart A particles is also considered as the ideal dense medium to strengthen separation efficiency. Fluidization stability reflects the bed pressure fluctuations and the distribution of bubble and emulsion phases, affecting the separation performance. And the main frequency of pressure fluctuations can directly reflect the degree of pressure fluctuations. Therefore, the detailed fluidization stability is analyzed combined the method of standard deviation of pressure fluctuations, power spectral density, etc., for Geldart A particles. The results showed that maintaining an appropriate gas velocity resulted in an average bed pressure of around 2000 Pa. The main frequency is mainly concentrated around 1–1.5 Hz. Finally, a prediction model of the main frequency of pressure fluctuations is established, and the error can be controlled within ±0.15. The investigation further proved the stable fluidization of Geldart A particles and provides a method for predicting the main frequency of pressure fluctuations in the gas–solid separation fluidized bed.

Graphical abstract

Keywords

Geldart A dense medium; Fluidization stability; Periodic fluctuations; Pressure fluctuations frequency; Gas–solid separation fluidized bed

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