Korean Journal of Chemical Engineering

The Korean Institute of Chemical Engineers (한국화학공학회)
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Optimization fluidization characteristics conditions of nickel oxide for hydrogen reduction by fluidized bed reactor

  • Lee, Jae-Rang (Climate Change Research Division, Korea Institute of Energy Research) ;
  • Hasolli, Naim (Climate Change Research Division, Korea Institute of Energy Research) ;
  • Jeon, Seong-Min (Climate Change Research Division, Korea Institute of Energy Research) ;
  • Lee, Kang-San (Climate Change Research Division, Korea Institute of Energy Research) ;
  • Kim, Kwang-Deuk (Climate Change Research Division, Korea Institute of Energy Research) ;
  • Kim, Yong-Ha (Department of Chemical Engineering, Pukyong National University) ;
  • Lee, Kwan-Young (Department of Chemical Biological Engineering, Korea University) ;
  • Park, Young-Ok (Climate Change Research Division, Korea Institute of Energy Research)
  • Received : 2018.02.27
  • Accepted : 2018.07.31
  • Published : 2018.11.30
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Abstract

We evaluated the optimal conditions for fluidization of nickel oxide (NiO) and its reduction into high-purity Ni during hydrogen reduction in a laboratory-scale fluidized bed reactor. A comparative study was performed through structural shape analysis using scanning electron microscopy (SEM); variance in pressure drop, minimum fluidization velocity, terminal velocity, reduction rate, and mass loss were assessed at temperatures ranging from 400 to $600^{\circ}C$ and at 20, 40, and 60 min in reaction time. We estimated the sample weight with most active fluidization to be 200 g based on the bed diameter of the fluidized bed reactor and height of the stocked material. The optimal conditions for NiO hydrogen reduction were found to be height of sample H to the internal fluidized bed reactor diameter D was H/D=1, reaction temperature of $550^{\circ}C$, reaction time of 60 min, superficial gas velocity of 0.011 m/s, and pressure drop of 77 Pa during fluidization. We determined the best operating conditions for the NiO hydrogen reduction process based on these findings.

Keywords

Acknowledgement

Supported by : Korea Evaluation Institute of Industrial Technology (KEIT)

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