Abstract
In this paper, thermodynamic equilibrium approaches are used to study the effect of CO2 addition, as co-reactant in supercritical water gasification (SCWG) of sugarcane bagasse to improve syngas production. The effects of temperature, pressure, biomass composition and co-reactant composition were evaluated under equilibrium compositions for isothermic systems and thermal behavior for adiabatic systems. The CO2 concentration in feed was analyzed at three different mass compositions: 15, 25 and 35 (wt%). The Virial equation of state was used to represent the non-ideality of both isothermic and adiabatic systems. The problems were formulated as optimization problems (non-linear programing) and the software GAMS with the CONOPT solver were used to solve them. Syngas with a H2/CO molar ratio close to 2 (ideal for further Fischer–Tropsch synthesis application) was obtained with an addition of CO2 as a co-reactant at 35wt%. The calculated final temperatures were close to the initial ones, indicating low energy requirements for maintain these reactions.
Published Version
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