抄録
Supercritical water is water at fluid phase whose temperature and pressure are above its critical values (374 ℃, 22.1 MPa). At this state, water has high potential as a solvent for organic components and gases. As a result, biomass could be homogeneously dissolved in supercritical water and consequently converted into gas with high efficiency. In this study, tomato residue, which is an agricultural waste, was used as feedstock model for process design and evaluation of supercritical water gasification (SCWG) process. Liquefaction process was introduced as pretreatment step prior to SCWG. The feedstock was heated up to 600 ℃ and pressurized to 25 MPa. Process equilibrium was calculated based on Gibb's free energy minimization. Carbon dioxide was absorbed by additional water from final gas product. Heat recovery and energy production were estimated.
