Experiment and numerical analysis of catalytic CO2 methanation in bubbling fluidized bed reactor

Son Ich Ngo, Young Il Lim, Doyeon Lee, Myung Won Seo, Sungwon Kim

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

This study experimentally and numerically investigated the hydrodynamics, reaction kinetics, and heat transfer of a bench-scale bubbling fluidized bed (BFB) reactor for CO2 methanation. A three-dimensional gas–solid Eulerian computational fluid dynamics (CFD) model coupled with a modified Syamlal–O'Brien drag model and reaction kinetics for Ni-based catalysts was developed. The CFD model was validated against experimental data for pressure, temperature, and gas composition at 1 bar and an inlet flow rate of 2 L/min with an inlet N2 content of 77.5%. The axial pressure drop, solid volume fraction, temperature, gas composition, and bed-to-wall heat transfer coefficient (HTC) were compared for four inlet N2 contents: 77.5%, 50%, 25%, and 0%. As the inlet N2 content decreased, the mean bed temperature increased from 340 to 456 °C, the gas volume decreased owing to the reaction, the fluidizing number (ug/umf) decreased from 4.1 to 3.5, and the solid holdup increased. Consequently, the HTC increased from 327 to 386 W/m2/K. This study identified successfully the effects of hydrodynamics and reaction kinetics on HTC in the BFB for CO2 methanation.

Original languageEnglish
Article number113863
JournalEnergy Conversion and Management
Volume233
DOIs
StatePublished - 1 Apr 2021

Keywords

  • Bubbling fluidized bed (BFB)
  • CO methanation
  • Computational fluid dynamics (CFD)
  • Feed dilution
  • Heat transfer coefficient (HTC)
  • Power-to-Gas (PtG)

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