Thermoeconomic and environmental analysis and optimization of the supercritical CO2 cycle integration in a simple cycle power plant

In the present work, a thermoeconomic and thermo-environmental analysis is carried out in Santa Rosa simple cycle thermal power plant (air Brayton cycle), located in Peru. Subsequently, the same analysis is applied to a proposed integrated thermal power plant, formed by the integration of a supercritical CO2 partial heating Brayton cycle in the mentioned simple cycle thermal power plant. Also, an exhaustive parametric study is carried out to investigate the effects of some decision variables on the thermoeconomic performance of the proposed system. Finally, the integrated thermal power plant is optimized from the thermoeconomic and environmental point of view, the objective function considered is the total cost, which is the sum of the capital investment cost, exergy destruction cost and environmental cost. The results show that the total product unit cost (electricity) is reduced by 10.37% respect to the initial condition. In addition, the specific investment cost and net efficiency are lower by 25.25% and 0.45% respectively, compared to a conventional combined cycle thermal power plant.