Abstract
With the development of GEN-IV nuclear reactor technology, the supercritical carbon dioxide (SCO2) Brayton cycle has attracted wide attention for its simple structure and high efficiency. Correspondingly, a series of research has been carried out to study the characteristics of the cycle. The control flexibility of the power generation system has rarely been studied. This paper carried out a dynamic performance of the 20 MW-SCO2 recompression cycle based on the Simulink software. In the simulation, the response characteristics of the system main parameters under the disturbances of cooling water temperature, split ratio, main compressor inlet temperature and pressure were analyzed. The results show that the turbine inlet temperature is most affected by the disturbances, with a re-stabilization time of 2500–3000 s. According to the response characteristics of the system after being disturbed, this study proposed a stable operation control scheme. The scheme is coordinated with the main compressor inlet temperature and pressure control, recompressor outlet pressure control, turbine inlet temperature control and turbine load control. Finally, the control strategy is verified with the disturbance of reduced split ratio, and the results show that the control effect is good.
Highlights
The supercritical carbon dioxide (SCO2) Brayton cycle has been widely used in a variety of power generation scenarios, including nuclear energy [1], solar energy [2], and thermal power [3]
Considering that the SCO2 cycle is widely used in the power generation system, attention needs to be paid to the performance of variable load and flexibility
As a supplement to the previous research, this paper studies the dynamic performance of the SCO2 recompression cycle based on a 20 MW sodium-cooled reactor with Simulink software
Summary
The supercritical carbon dioxide (SCO2) Brayton cycle has been widely used in a variety of power generation scenarios, including nuclear energy [1], solar energy [2], and thermal power [3]. Hu et al [13] carried out dynamic modeling on the recuperator of a 2 MW-SCO2 power generation system, and mainly studied the fluid parameter change law in the recuperator during cold start and variable load. Ma et al [14] developed the dynamic model of the recuperators for the 1000 MW-SCO2 coal-fired power unit and analyzed the parameter dynamic response trend with the inlet temperature and mass flow rate change. Zhu [18] developed a 350 kW SC recompression closed-loop dynamic model with Panysimu software and analyzed the main parameter response characteristics under the disturbance of the heat source duty, regulating valve opening and cooling water flow, but the research on the control strategy was not conducted. There is a lack of research on the dynamic characteristics of SCO2 cycle and the control strategy for stable operation.
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