Multi-scale modelling of a fluidized bed biomass gasifier of industrial size (1 MW) using a detailed particle model coupled to CFD: Proof of feasibility and advantages over simplified approaches

•Multi-scale modelling of a fluidized bed biomass gasifier of industrial size.•A detailed particle model (PM) resolving gradients is coupled to CFD reactor model.•Comparison to the simplified modelling approach commonly employed in literature.•Analysis of particle tracks and gas release stress the need to use a detailed PM.•Feasibility of the coupled model was shown for a plant of relevant size (1 MW)