(374an) The Development of CFD Modeling of Fluidized Bed Gasifier for Biomass Gasification
Abstract- Biomass gasification process is one of the efficient and clean ways to produce hydrogen. This process usually tooks place in fluidized bed reactor due to their excellent solid mixing, heat and mass transfer properties. For maximum performance of solid mixing, fluidized bed reactor is best to be operated in bubbling flow regime. During the process, several complex simultaneous and parallel reactions such as char gasification, water-gas shift and methanation reactions occur simulataneously. The first part of the paper highlights the model development for hydrodynamics behavior on the effect of steam inlet velocity and solid initial bed height on the solid fluidization in the fluidized bed gasifier using Eulerian-Eulerian multiphase model coupled with kinetic granular theory .From the simulation that has been done, it is observed that 3.5 Umf steam inlet velocity and 5 cm solid initial bed height gives the best solid fluidization in the gasifier. In the second part, the reaction model was developed using CFD to predict the hydrogen production from the gasifier. The results shows that the highest hydrogen production will be obtained at temperature 850 0C. This is because at temperature higher than 850 0C the exothermic water-gas shift and methanation reactions are no longer favorable and the production of hydrogen will decrease. Overall, the prediction of hydrogen production from the reaction model is in good agreement with the experimental data.
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