Thermodynamic simulations of lignite-fired IGCC with in situ desulfurization and CO2 capture

Abstract IGCC cycles running on Greek lignite with in situ desulfurization and CO2 capture were simulated using the ASPEN PLUS process simulator and compared with other power cycles. Dolomite was chosen as the material for in situ desulfurization. Considering the power produced and residual sulfur content of the off-gas, an oxygen-blown gasifier operated at 1.8 MPa and 950°C, having a thermal efficiency of 38.9%, gives the best performance. The efficiency loss due to CO2 capture can be largely compensated using IGCC cycles.