Abstract
Supercritical Water Gasification (SCWG) is a promising way of directly producing hydrogen at high pressures and with a short reaction time. In this work, the use of SCWG in the conversion of biomass was investigated through a mathematical model based on the thermodynamic equilibrium of the reactions involved in the process. The numerical model applied was based on the literature and evaluated by the reproduction of experimental data. The effects of temperature, pressure and several sources of biomass (alcohols, aldehydes, carbohydrates, phenols) were evaluated, as well as the limitations of the model. The results showed that the model was able to represent well the experimental data, with standard deviations of the dry gas composition for H2 and CO2 being 6.5 % and 2.82 % for ethanol and glycerol, respectively. Predictions performed with guaiacol, phenol and glucose indicated, given a specific scenario, concentrations of H2 at around 68, 67 and 66 %, respectively.
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