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Characterization of a dual fluidized bed gasifier with blended biomass/coal as feedstock.
Bioresource Technology 2018 April
A one-dimensional model is built based on the commercial Aspen Plus software to kinetically simulate the biomass/coal co-gasification process in a dual fluidized bed gasifier. The synergistic effect on the co-gasification kinetics is allowed for, and is coupled with the gas-solid flow hydrodynamics. With the developed model, the effects of different key operating parameters including the biomass blending ratio (Rb ), the initial bed temperature (Tg ), the feedstock mass flow rate (Ffs ), the bed material flux (Fbm ) and the steam to carbon ratio (Rsc ) on the resultant syngas composition and the supplemental fuel mass flow rate (Fsf ) are investigated, and the operation parameters are optimized. It is found that increasing Rb and Tg can enhance the gasification, while increasing Ffs and Rsc restricts the gasification. Increasing Fbm has slight effect on the gasification results but can reduce Fsf . The cold gas efficiency is up to 78.9% under the proposed optimum condition.
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