Analyses and optimization of the CFETR power conversion system with a new supercritical CO 2 Brayton cycle

Nuclear Fushion

article

Pinghui Zhao¹  Zhansheng Chen²  Yixuan Jin²  Teng Wan²  Xiaohu Wang²  Ke Liu²  Mingzhun Lei¹  Yuanjie Li²  Changhong Peng² 

[1] Institute of Plasma Physics Chinese Academy of Sciences;School of Nuclear Science and Technology, University of Science and Technology of China

关键词: supercritical CO2 Brayton cycle;    CFETR;    exergy;    exergoeconomic;    multi-criteria optimization;   

DOI  :  10.1088/1741-4326/acbe0d

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

In this paper, the Chinese Fusion Engineering Testing Reactor (CFETR) power conversion system, with a supercritical CO₂ (SCO₂) Brayton cycle, is designed, analyzed and optimized. Considering the pulse operation of the reactor, a heat storage loop with high temperature molten salt and low temperature concrete is introduced. Based on the parameters of the first cooling loop, the CFETR power conversion loop is designed and studied. A new SCO₂ Brayton cycle for the CFETR dual heat sources, blanket and divertor, is developed and optimized using a genetic algorithm. Compared to other simple and recompression cycles, it is shown that the new SCO₂ Brayton cycle combines maximum thermal efficiency with simplicity. Exergy analyses are carried out and show that the exergy destruction rates of turbine and heat exchangers between different loops are the largest due to the large turbine power and the large temperature difference. The exergoeconomic analyses show that the fusion reactor accounts for the main cost, which is the key to the economy of fusion power generation. The following sensitivity analyses show that the hot molten salt temperature has a major influence on the system performance. Finally, several multi-criteria optimization algorithms are introduced to simultaneously optimize the three fitness functions, the cycle thermal efficiency, the system exergy efficiency and the total system product unit cost. It is found that the maximum thermal efficiency, the maximum exergy efficiency and the lowest total system product unit cost can be obtained almost simultaneously for the new CFETR power conversion system, and this optimal operation scheme is presented.

【 授权许可】

Unknown