Dynamic Analysis of a Novel Quadruple Combined Cycle Based on Integrated Solar Tower-Gas Turbine-Supercritical CO2 and Organic Rankine Cycles

Abstract

Abstract In this article, a novel quadruple cycle for power generation is presented. It consists of a gas turbine cycle, a Brayton cycle of supercritical carbon dioxide, a Rankin organic cycle with a cyclopentane working fluid, a Rankin steam cycle, a central tower, and a heliostat solar field. Because of improving the Brayton cycle's performance, supercritical carbon dioxide and the Rankine organic cycle have been added to the system. A solar tower system has been used to heat the incoming airflow to the combustion chamber. The heat generated by the solar tower in the first part increases the gas turbine cycle's air temperature, and in the second part, the water vapor heats the Rankin steam cycle. Due to solar radiation instability, the proposed system's performance is dynamically examined every hour of the year, and the results are reported. The thermodynamic simulation results are validated by thermoflex software and reference case with high accuracy. In this regard, energy, exergy, exergoeconomic, exergoenvironmental, emergoeconomic, and emergoenvironmental (6E) analyses have been performed for this system. The result indicates that the gas turbine cycle's fuel consumption is reduced by about 9% to 1.53 kg/s with the solar system's addition. Using solar energy and the Rankin steam cycle, the cycle's production capacity will increase from 43 MW to 66 MW.