In the present study, to investigate the fast pyrolysis characteristics of woody biomass in bubbling fluidised bed reactor, numerical approach is applied by using CFD (computational fluid dynamics). For the multiphase reacting flow fields between solid and gas, Eulerian-Eulerian approach is applied including three gas species and three solid phases. For the woody biomass pyrolysis, two-stage, semi-global reaction kinetics is adopted considering the secondary tar cracking mechanism. The flow and

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... reaction characteristics of the reactor are fully investigated and in particular the rising bubble motion and its role for pyrolysis reaction are studied. Also, the region is analysed, where the secondary tar cracking reaction occurs for future work to increase oil yield by suppressing the secondary reaction. From the predicted results, it is fully scrutinized that the heat transfer between bed material and biomass is mainly governed by particular bubble motions and this influences the pyrolysis reaction.