Dynamic simulation and parameter analysis of solar-coal hybrid power plant based on the supercritical CO2 Brayton cycle

To improve the energy utilization efficiency of the solar-coal hybrid power plant, a solar power tower plant with the supercritical CO2 (S-CO2) Brayton cycle is proposed. In this study, the dynamic mathematical model is established by lumped parameter method. Meanwhile, the thermodynamic performance of the system is analyzed by exergy and energy analysis methods. The results show that the maximum error of dynamic math-ematical model is less than 5%. The exergy analysis shows that exergy destruction mainly occurs in the heat exchanger, followed by the recuperator and precooler. In addition, the thermal efficiency of the S-CO2 solar units is improved by approximately 2.5% after coupling with coal-fired thermal power units. The dynamic mathe-matical model proposed in this study can be used to analyze the dynamic characteristics, and achieve high solar power generation efficiency. It provides a reference for the efficient utilization of solar-coal energy complementation.

Automated summary

In order to improve the energy utilization efficiency of solar-coal hybrid power plants, a solar power tower plant with the supercritical CO2 (S-CO2) Brayton cycle is proposed. A dynamic mathematical model is established using the lumped parameter method and the thermodynamic performance of the system is analyzed using exergy and energy analysis methods. The results show that the proposed model has an error of less than 5%. Exergy analysis reveals that exergy destruction mainly occurs in the heat exchanger, followed by the recuperator and precooler. Additionally, the thermal efficiency of the S-CO2 solar units is improved by approximately 2.5% after coupling with coal-fired thermal power units. The proposed dynamic mathematical model can be used to analyze the dynamic characteristics and achieve high solar power generation efficiency, providing a reference for the efficient utilization of solar-coal energy complementation.