超临界二氧化碳再压缩布雷顿循环系统动态特性研究

Dynamic characteristics of supercritical carbon dioxide recompression Brayton cycle system

中文关键词: 超临界二氧化碳，再压缩布雷顿循环，仿真，动态特性

英文关键词: S-CO2, Re-compression  Brayton cycle, simulation, dynamic  characteristics

中文摘要:

      超临界二氧化碳布雷顿循环因其环保性与高热电转换效率而被视为核能发电未来发展的重要方向。本文借助Simulink软件平台,建立了SCO2再压缩布雷顿循环闭环动态仿真系统,通过模拟结果与Sandia实验数据的比较,验证系统模型的有效性。获得了热源功率和流量扰动条件下系统热力学参数的响应特征,热源功率的变化促使系统效率单调提升或降低,而改变系统流量未呈现类似变化趋势；扰动施加过程中,热源端温度变化明显,预冷器端温度变化较小。基于仿真结果,提出了具有针对性的机组控制策略,可为SCO2再压缩布雷顿工程应用奠定基础。

英文摘要:

      Supercritical carbon dioxide (S-CO2) Brayton cycle is regarded as an important direction for the future development of nuclear power generation because of its environmental protection and high thermoelectric conversion efficiency. With the help of Simulink software platform, the closed-loop dynamic simulation system of S-CO2 recompression Brayton cycle is established. The validity of the system model is verified by comparing the simulation results with Sandia experimental data. In this paper, the response characteristics of system thermodynamic parameters under the disturbance of heat source power and flow rate are obtained. The change of heat source power makes the system efficiency monotonously increase or decrease, while the change of system flow rate does not show a similar trend.When the disturbance is applied to the system, the temperature change near the heat source is large, and the temperature change near the precooler is small. Based on the simulation results, a targeted unit control strategy is proposed, which can lay the foundation for the engineering application of S-CO2 recompression Brayton.