Korean Journal of Chemical Engineering

The Korean Institute of Chemical Engineers (한국화학공학회)
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A study on the direct catalytic steam gasification of coal for the bench-scale system

  • Kang, Tae-Jin (Carbon Resources Institute, Greenhouse Gas Resources Research Group, Korea Research Institute of Chemical Technology) ;
  • Park, HyeJung (Department of Energy Systems Research, Graduate School, Ajou University) ;
  • Namkung, Hueon (Institute of Clean Coal Technology, East China University of Sci. & Tech.) ;
  • Xu, Li-Hua (Department of Energy Systems Research, Graduate School, Ajou University) ;
  • Park, Jung-Hyun (Carbon Resources Institute, Greenhouse Gas Resources Research Group, Korea Research Institute of Chemical Technology) ;
  • Heo, Iljeong (Carbon Resources Institute, Greenhouse Gas Resources Research Group, Korea Research Institute of Chemical Technology) ;
  • Chang, Tae-Sun (Carbon Resources Institute, Greenhouse Gas Resources Research Group, Korea Research Institute of Chemical Technology) ;
  • Kim, Beom Sik (Carbon Resources Institute, CO2 Energy Vector Research Group, Korea Research Institute of Chemical Technology) ;
  • Kim, Hyung-Taek (Department of Energy Systems Research, Graduate School, Ajou University)
  • Received : 2017.02.06
  • Accepted : 2017.06.20
  • Published : 2017.10.01
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Abstract

Various techniques have been developed to increase the efficiency of coal gasification. The use of a catalyst in the catalytic-steam gasification process lowers the activation energy required for the coal gasification reaction. Catalytic-steam gasification uses steam rather than oxygen as the oxidant and can lead to an increased $H_2/CO$ ratio. The purpose of this study was to evaluate the composition of syngas produced under various reaction conditions and the effects of these conditions on the catalyst performance in the gasification reaction. Simultaneous evaluation of the kinetic parameters was undertaken through a lab-scale experiment using Indonesian low rank coals and a bench-scale catalytic-steam gasifier design. The composition of the syngas and the reaction characteristics obtained in the lab- and bench-scale experiments employing the catalytic gasification reactor were compared. The optimal conditions for syngas production were empirically derived using lab-scale catalytic-steam gasification. Scale-up of a bench-scale catalytic-steam gasifier was based on the lab-scale results based on the similarities between the two systems. The results indicated that when the catalytic-steam gasification reaction was optimized by applying the $K_2CO_3$ catalyst to low rank coal, a higher hydrogen yield could be produced compared to the conventional gasification process, even at low temperature.

Keywords

Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP)

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