Flow behavior and heat transfer in bubbling fluidized-bed with immersed heat exchange tubes for CO2 methanation

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

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

This study aims to investigate hydrodynamic and heat transfer characteristics of a BFB reactor with immersed heat exchange tubes for CO2 methanation using a two-dimensional (2D) gas-solid Eulerian computational fluid dynamics (CFD) model. A reaction kinetics model for Ni-based catalyst was coupled with the CFD model. The 2D-CFD model with the Huilin and Gidaspow drag was validated with experimental data for the bed expansion of Geldart B particles according to gas velocity. It was demonstrated that the heat of reaction was effectively removed in the BFB reactor with a 25% heat exchange area and that the reactor maintained isotherm conditions. The CO2 conversion was 92% in the BFB reactor at 400 °C and 5 bar. The overall heat transfer coefficient from the bed to the heat exchange tubes was estimated at 114 W/m2/K for an inlet gas velocity of 0.13 m/s.

Original languageEnglish
Pages (from-to)462-474
Number of pages13
JournalPowder Technology
Volume380
DOIs
StatePublished - Mar 2021

Keywords

  • Bubbling fluidized bed (BFB)
  • CO methanation
  • Computational fluid dynamics (CFD)
  • Heat transfer coefficient
  • Immersed heat exchange tubes
  • Power-to-gas (PtG)

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