Characteristics of pressure fluctuations and fine coal preparation in gas-vibro fluidized bed--颗粒学报PARTICUOLOGY

Dong, L., Zhao, Y., Peng, L., Zhao, J., Luo, Z., Liu, Q., & Duan, C. (2015). Characteristics of pressure fluctuations and fine coal preparation in gas-vibro fluidized bed. Particuology, 21, 146-153. https://doi.org/10.1016/j.partic.2014.08.011

Characteristics of pressure fluctuations and fine coal preparation in gas-vibro fluidized bed

Liang Dong ^a, Yuemin Zhao ^a *, Liping Peng ^b, Jie Zhao ^a, Zhenfu Luo ^a, Qingxia Liu ^c, Chenlong Duan ^a

a School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
b School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
c Department of Chemical and Materials Engineering, University of Alberta, 9107-116 Street, Edmonton, AB T6G 2V4, Canada

10.1016/j.partic.2014.08.011

Volume 21, August 2015, Pages 146-153

Received 21 June 2014, Revised 19 July 2014, Accepted 8 August 2014, Available online 27 December 2014, Version of Record 6 June 2015.

E-mail: ymzhao_paper@126.com

Highlights

• A gas-vibro fluidized bed with magnetic powder as heavy medium was proposed for coal preparation.

• Relationship among pressure fluctuation, bubble behavior and separation efficiency was analyzed.

• Ash content of coal sample (3–6 mm size) could be reduced from 42.55% to 16.54%.

• Sulfur content in cleaned coal decreased efficiently.

Abstract

To improve the separation efficiency of air dense medium fluidized beds for dry coal preparation, a gas-vibro fluidized bed has been proposed in which magnetic powder is used as the heavy medium. Pressure fluctuations in the gas-vibro fluidized bed were investigated using time- and frequency-domain analysis methods. The relationship between pressure fluctuations, bubble behavior, and separation efficiency was established. The low amplitude of the standard deviation, the power spectral density (PSD), the incoherent-output PSD, and the high amplitude of the coherent-output PSD, which corresponds to the bubble behavior in the bed, were improved for coal preparation. The coal ash content was reduced from 42.55% to 16.54% by using the gas-vibro fluidized bed.

Graphical abstract

Keywords

Pressure fluctuation; Gas-vibro fluidized bed; Power spectral; Coherence; Coal preparation

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