Insights into 4E evaluation of a novel solar-assisted gas-fired decarburization power generation system with oxygen-enriched combustion

Abstract

To explore the high thermal performance of the gas-fired decarburization power generation system with oxygen-enriched combustion (GDPGS-OC), the thermal performance of two GDPGS-OC operation schemes is examined. Based on the optimal operation scheme, a solar-assisted gas-fired decarburization power generation system with oxygen-enriched combustion (SGDPGS-OC) is proposed. The system uses the main condensed water to recover the waste heat of the CO2 compression and storage system and introduces solar energy as an auxiliary heat source to heat part of the high-pressure circulating water. An energy, exergy, economic and environmental (4 E) evaluation of the SGDPGS-OC is performed, and the sensitivity analysis is conducted for key parameters on the thermal performance. The results show that the thermal performance, economy, and environmental protection of SGDPGS-OC are better than those of conventional GDPGS-OC. Raising the gas turbine load, direct normal irradiance, and flue gas recirculation temperature increases the net power generation efficiency and the exergy efficiency of the system and components. Compared with the gas turbine combined cycle, the global warming potential of the GDPGS-OC and the SGDPGS-OC is reduced by 98.45% and 98.48%, respectively, and the latter has a more obvious advantage of CO2 emission reduction.