(560o) Computational Study on Biomass Fast Pyrolysis: Design Considerations for a Laboratory-Scale Fluidized Bed
In this study, we simulate a 3D bubbling fluidized bed biomass fast pyrolysis reactor from a prior study . This study explores operating effects on hydrodynamics and biomass conversion as the gas flow is increased through the bubbling-to-slugging transition and turbulent regime, with all the other operating variables held constant. We employ MFiX, an open-source software package supported by DOE, which utilizes a continuum (two-fluid) approach for modeling the reactor hydrodynamics. Bubbling intensity and dynamic characteristics were evaluated utilizing pressure-based measurements [http://dx.doi.org/10.1016/j.cej.2016.08.113]. A novel entropy approach based on time irreversibility is introduced to evaluate hydrodynamics.
Mixing, hydrodynamics, and pyrolysis yields are compared which show the effect of fluidizing gas and fluidization regime on biomass fast pyrolysis in bubbling bed reactors of Geldart B particles. This work highlights the importance of initial reactor design for optimizing yield. We will discuss implications on future numerical simulations and experiments based on our observations.