Fluidization characteristics of fine cohesive particles assisted by vertical vibration in a fluidized bed reactor

Jae Rang Lee, Kang San Lee, Young Ok Park, Kwan Young Lee

Research output: Contribution to journalArticle

Abstract

This research has examined fluidization and product characteristics through hydrogen reduction for nickel oxide (NiO) of contained in the Geldart group C assisted by vertical vibration in a fluidized bed reactor. It has confirmed that as vibration frequency and reaction temperature increase, the pressure drop trend becomes stable and minimum fluidization velocity reduces. As the gas–solid reaction increased with the increase in reaction temperature, oxygen contained in NiO was removed with a fast reaction time and therefore, the mass loss drastically decreased. When reaction temperature increased, the reacted fraction quickly increased because of the short reaction time. In the case of fluidization that was not under vibration, SEM and TEM analysis of the products showed agglomeration and chemical bonding. However, with a vibration, no agglomeration occurred, and a porous surface appeared. For fluidization under vibration, energy-dispersive X-ray spectroscopy and mapping analysis of products showed that the oxygen content and distribution decreased, and a small amount of oxygen remained surrounding the product surface. Agglomeration occurred again at higher values, with a superficial gas velocity of 0.45 m/s and vibration frequency of 60 Hz. It has also confirmed that the vertical vibration relieves the forces between fine cohesive particles to eliminate agglomeration and give them an active fluidization state.

Original languageEnglish
Article number122454
JournalChemical Engineering Journal
Volume380
DOIs
Publication statusPublished - 2020 Jan 15

Fingerprint

fluidization
Fluidization
Fluidized beds
vibration
Agglomeration
agglomeration
Nickel oxide
Oxygen
nickel
oxide
chemical bonding
Temperature
Pressure drop
oxygen
Hydrogen
temperature
Gases
reactor
particle
pressure drop

Keywords

  • Geldart group C
  • Hydrogen reduction
  • Minimum fluidization velocity
  • Reacted fraction
  • Vertical vibration

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Fluidization characteristics of fine cohesive particles assisted by vertical vibration in a fluidized bed reactor. / Lee, Jae Rang; Lee, Kang San; Park, Young Ok; Lee, Kwan Young.

In: Chemical Engineering Journal, Vol. 380, 122454, 15.01.2020.

Research output: Contribution to journalArticle

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