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

作　　者：王广义[1] 杨竹强[2] 张博[2] WANG Guangyi;YANG Zhuqiang;ZHANG Bo(China Nuclear Power Research and Design Institute,Chengdu 610000,China;School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]中国核动力研究设计院,四川成都610000 [2]大连理工大学能源与动力学院,辽宁大连116024

出　　处：《热科学与技术》2023年第3期290-299,共10页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51876020)。

摘　　要：超临界二氧化碳(S-CO_(2))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。借助Simulink软件平台,建立了S-CO_(2)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,验证了系统模型的有效性。研究搭建的超临界CO_(2)再压缩布雷顿循环系统在稳态设计点条件下的预测热效率为31.85%,此外,还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,发现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,循环系统的参数对热源功率的变化非常敏感,热源功率减小15.00%,循环效率从31.85%降低到22.00%。最终基于仿真结果,获得多参量耦合关联下的变化规律与调控策略,可为S-CO_(2)再压缩布雷顿工程应用奠定基础。Supercritical carbon dioxide(S-CO_(2))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-CO_(2) recompression Brayton cycle is established.The model is verified by comparing the simulation results with Sandia experimental data.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 system parameters are sensible to the heat source power,that the system efficiency falls from 31.85% down to 22.00%when the power decreases 15.00%.Based on the simulation results,a targeted unit control strategy is proposed,which can lay the foundation for the engineering application of S-CO_(2) recompression Brayton.

关 键 词：超临界二氧化碳 再压缩布雷顿循环 仿真 动态特性 

分 类 号：TL334[核科学技术—核技术及应用]