Three dimensional full-loop CFD simulation of hydrodynamics in a pilot-scale dual fluidized bed system for biomass gasification

Hao Luo, Weigang Lin, Wenli Song, Songgeng Li, Kim Dam-Johansen, Hao Wu*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A three-dimensional CFD model was developed to simulate the hydrodynamics in a pilot-scale dual fluidized bed system for biomass gasification. The system includes a fast fluidized bed (FFB) for char combustion, a cyclone separator, two loop-seals, and a bubbling fluidized bed (BFB) for biomass gasification. A comparison of a hybrid EMMS drag model (i.e. the EMMS/matrix drag model for FFB, and the EMMS/bubbling drag model for BFB) proposed in this paper and the Gidaspow drag model was carried out at air and steam gasification conditions. The solid circulation rate, solid inventory distribution, and the pressure distribution predicted by the hybrid EMMS drag model were in better agreement with experimental data. The effect of solid inventory on hydrodynamics was evaluated by using the hybrid EMMS drag model. The results indicate that the solid circulation rate and its fluctuation increased with increasing solid inventory. In the simulated system, the operating stability was reduced when the solid inventory was increased to 200 kg due to “choking” phenomenon.

Original languageEnglish
Article number106146
JournalFuel Processing Technology
Volume195
Number of pages10
ISSN0378-3820
DOIs
Publication statusPublished - 2019

Keywords

  • Biomass gasification
  • CFD simulations
  • Dual fluidized bed
  • EMMS
  • Solid inventory

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