Abstract
The supercritical carbon dioxide (SCO2) Brayton cycle, as a substitute for the steam cycle, can be widely used in a variety of power generation scenarios. However, most of the existing SCO2 cycle studies are restricted to basic thermodynamics research, parameter optimizations, system design in different application fields, and even economic analysis. Considering the load variability and control flexibility of the power generation system, the dynamic performance research of the SCO2 cycle is also crucial, but the work done is still limited. Based on the previous studies, Simulink software is used in this paper to develop a dynamic model of the 20 MW-SCO2 recompression cycle, which specifically includes component models that can independently realize physical functions and an overall closed-loop cycle model. A series of comparative calculation are carried out to verify the models and the results are very positive. The SCO2 recompression power system is built with the developed models and the dynamic model runs stably with a maximum error of 0.56%. Finally, the simulation of the dynamic switching conditions of the 20 MW-SCO2 recompression cycle are performed and the analysis results supply instructive suggestions for the system operation and control.
Highlights
Based on the above requirements, this paper develops the dynamic model of the SCO2 system based on the Simulink platform, which is convenient for system control strategy research
In the Simulink model, the printed circuit heat exchangers (PCHEs) was divided into five nodes, and the model was built with the Simulink graphical modeling tool based on the above-mentioned unsteady heat transfer relationship
The models of a 20 MW-SCO2 recompression cycle were developed based on Simulink software, including heat exchanger models, compressor models, turbine models, and surge tank models
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. A large number of results show that the SCO2 cycle is more suitable for higher temperature nuclear reactors due to the simple structure and high efficiency, and has the potential to reduce costs. Li et al [21] conceptually designed the power system of the SCO2 cycle coupled with a small lead-cooled fast reactor, and analyzed the thermodynamic and economic performance. Some scholars have conceptually designed the configurations of SCO2 coal-fired power plants with different loads, and proposed a series of SCO2 boiler and cycle-side temperature coupling methods to rationally utilize the flue gas heat [15,22,23]. As a supplement to the previous research, this paper studies the dynamic performance of the SCO2 recompression cycle of a 20 MW sodium-cooled reactor with Simulink software
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