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

• Published in: Applied thermal engineering Vol. 152; pp. 1 - 12
• Main Authors: Sánchez Villafana, Eder Darwin, Vargas Machuca Bueno, Juan Pablo
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.04.2019; Elsevier BV
• Subjects: Air Brayton cycle; Brayton cycle; Carbon dioxide; Combined cycle power generation; Electricity pricing; Exergy; Investment; Optimization; Power plants; Supercritical CO2 Brayton cycle; Thermal power plants; Thermo-environmental; Thermoeconomic; Thermoelectricity; Total cost; Total product unit cost; Thermoeconomic; Air Brayton cycle; Total product unit cost; Thermo-environmental; Exergy; Supercritical CO2 Brayton cycle; Total cost
• ISSN: 1359-4311; 1873-5606
• DOI: 10.1016/j.applthermaleng.2019.02.052

•Thermoeconomic and thermo-environmental study has been implemented.•A comprehensive parametric study has been done on thermoeconomic performance.•Optimization is performed considering thermoeconomic and thermo-environmental impacts.•Minimum total cost and total product unit cost are obtained. 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.