Geldart A particles: Hydrodynamics of Geldart A magnetite powder with modulation by ultrafine coal particles in Gas-solid Fluidized Bed Coal Beneficiator (GFBCB)

Chengguo Liu, Chenyang Zhou, Zeneng Sun, Chenlong Duan, Jesse Zhu, Yuemin Zhao

Research output: Journal PublicationArticlepeer-review

Abstract

The Gas-solid Fluidized Bed Coal Beneficiator (GFBCB) is an important technology used in the dry coal beneficiation process, which requires lower bed density and very uniform density distribution. Geldart A particles, Geldart A magnetite particles “modulated” by a small fraction of Geldart C ultrafine coal particles, is proposed. Fundamental studies are carried out to provide a comprehensive understanding of its hydrodynamics, including the minimum fluidization velocity, bed expansion, and spatial bed density distribution. By adding the ultrafine coal particles, the minimum fluidization velocity (Umf) is lowered, with a modified Umf correlation proposed, the bed expansion drastically increased (by up to 30%), with more gas being retained in the bed for improved flowability, and the corresponding bed density decreased to 1600–2000 kg/m3, with more uniform distribution, all contributing to a more desirable separation environment for coal beneficiation.

Original languageEnglish
Article number117753
JournalPowder Technology
Volume408
DOIs
Publication statusPublished - Aug 2022
Externally publishedYes

Keywords

  • Bed expansion
  • Density adjustment and distribution
  • Geldart A particles
  • Geldart C particle modulation
  • GFBCB
  • Minimum fluidization velocity

ASJC Scopus subject areas

  • Chemical Engineering (all)

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