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Volume 116
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Study on the synergistic effect of vibration and airflow on fine coal distribution in a vibrating separation fluidized bed
Ruikang Fan a b c, Yu Wang a b c, Yuanyuan Li a b c, Yadong Zhang a b c, Enhui Zhou a b c *
a Jiangsu Key Laboratory for Clean Utilization of Carbon Resources, Xuzhou, 221116, China
b Key Laboratory of Coal Processing & Efficient Utilization, Ministry of Education, Xuzhou, 221116, China
c School of Chemical Engineering & Technology, China University of Mining & Technology, Xuzhou, 221116, China
10.1016/j.partic.2026.06.001
Volume 116, September 2026, Pages 1-16
Received 14 March 2026, Revised 16 May 2026, Accepted 2 June 2026, Available online 10 June 2026, Version of Record 17 June 2026.
E-mail: zeh@cumt.edu.cn
Highlights

• Vibration–airflow synergy yields a more stable and uniform fluidized bed, enabling high-efficiency fine coal separation.

• Vibration and bubble energy components are quantitatively distinguished for better understanding of bed dynamic behavior.

• Uniform energy distribution across the bed significantly improves the precision of fine coal density stratification.

• A three-level classification framework is established to identify coal particle distribution regimes in the fluidized bed.


Abstract

Vibration-gas synergy determines dense-medium fluidization for fine coal separation in vibrating fluidized beds, while underlying energy evolution and particle distribution mechanisms are unclear. This work uses PSD to capture vibration/bubble characteristic frequencies, vertical vibration energy attenuation and gas-velocity modulation on bed activity, and applies EMD to separate total fluctuating energy into vibrational and bubble energy. Results indicate that under low vibration and gas velocities, bubble energy remains uniformly distributed while vibration energy decays monotonically with bed height, causing fine coal to stratify at the bed top and resulting in poor separation efficiency. Optimal separation performance is achieved at f = 25 Hz, A = 2 mm, Ug = 1.4 Umfv, where vibration and bubble energy are balanced across the bed. Conversely, excessive vibration and gas velocities trigger pronounced fluctuations in both energy forms, hindering separation. By correlating spatial disparities in energy distribution with separation accuracy (E-value), this work transcends traditional approaches limited to density fluctuation standard deviation. It further delineates the effects of particle size and density on separation sensitivity, establishes a three-level distribution principle for separated particles, and constructs corresponding phase diagrams, thereby offering systematic theoretical insights and operational guidance for fine coal separation via vibrating fluidization.

Graphical abstract
Keywords
Vibration fluidization; Vibration energy; Bubble energy; Fine coal distribution
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