Novel design of integrated gasification combined cycle (IGCC) power plants with CO₂ capture

To develop the new integrated gasification combined cycle (IGCC) power plants with CO₂ capture, first the integrated intermittent chemical looping air separation (IICLAS) unit is added to improve the coal gasification and carries out the oxy-fuel combustion, second the CO₂ compression and sequestration (CCS) unit is added to achieve deep reductions in emissions of CO₂ to the atmosphere. Compared to the conventional cryogenic air separation (CAS) unit, the IICLAS unit continuously produces the high-purity oxygen without the solid looping cycles and it also generates the additional electricity by virtue of the heating jacket for the oxy-fuel combustion of methane (OCM) and the waste heat recovery mechanism. A few comparisons show that the IICLAS-based IGCC + CCS power system (Design 2) can effectively increase 12.2% of the gross power compared to the CAS-based IGCC + CCS power system (Design 1). For the dual IICLAS-based IGCC + CCS power system (Design 3), the OCM units are removed and the flue gas is split to reduce the circulated steam/water. Finally, Design 3 can ensure the lowest oxygen supply rate by 50.67 kg/s, the highest net efficiency by 40.25%, and the largest K_CC factor by 0.58.