抄録
Advanced Integrated coal Gasification Combined Cycle (A-IGCC) systems have been proposed to obtain higher thermal efficiency than that of IGCC systems by recuperating exhaust heat from a gas turbine as a heat source of a gasifier. To date, A-IGCC system that consists of gasification, gas cleaning, CO2 capturing, and combined cycle power generation units has not been designed. In this study, performances of A-IGCC systems were evaluated by using process simulator Aspen Plus. Results indicated that net thermal efficiencies of A-IGCC model with a hot gas desulfurizing unit (HGDU) were higher than those of the model with a cold gas desulfurizing unit (CGDU) by 0.4–2.5% due to losses in heat in the gas cleaning units and higher heating value of fuel gas. By assuming to use 1650 °C-class gas turbine, HGDU and above 20% of CO2 capturing, CO2 emission factors can be reduced below 503.2 kg-CO2/MWh.
