Mathematical Modeling of a Fluidized Bed Rice Husk Gasifier: Part I-Model Development
Two models (a single-compartment and a two-compartment) capable of predicting the steady state performance of a dual-distributor-type fluidized bed rice husk gasifier under a wide range of operating conditions were developed using the ASPEN PLUS process simulator. The models were based on material balance, energy balance, and chemical equilibrium relations. The single-compartment model neglected the complex hydrodynamic conditions prevalent in the gasifier and has only a single parameter (overall carbon conversion) that can be used to improve the fit between predicted and experimental gas compositions. The two-compartment model takes into consideration these complex hydrodynamic conditions and has two parameters (carbon conversion in the core and annular regions) that can be independently adjusted to account for the effect of various operating and design conditions on the composition of the gasification products. The models could be used to predict the performance of the gasifier when operating on other biomass materials.
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