Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Performance analysis of S-CO2 recompression Brayton cycle based on turbomachinery detailed design

  • Zhang, Yuandong (Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University) ;
  • Peng, Minjun (Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University) ;
  • Xia, Genglei (Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University) ;
  • Wang, Ge (Beijing Institute of Control and Engineering) ;
  • Zhou, Cheng (Beijing Institute of Control and Engineering)
  • Received : 2019.11.06
  • Accepted : 2020.02.24
  • Published : 2020.09.25
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Abstract

The nuclear reactor coupled with supercritical carbon dioxide (S-CO2) Brayton cycle has good prospects in generation IV reactors. Turbomachineries (turbine and compressor) are important work equipment in circulatory system, whose performances are critical to the efficiency of the energy conversion system. However, the sharp variations of S-CO2 thermophysical properties make turbomachinery performances more complex than that of traditional working fluids. Meanwhile, almost no systematic analysis has considered the effects of turbomachinery efficiency under different conditions. In this paper, an in-house code was developed to realize the geometric design and performance prediction of S-CO2 turbomachinery, and was coupled with systematic code for Brayton cycle characteristics analysis. The models and methodology adopted in calculation code were validated by experimental data. The effects of recompressed fraction, pressure and temperature on S-CO2 recompression Brayton cycle were studied based on detailed design of turbomachinery. The results demonstrate that the recompressed fraction affects the turbomachinery characteristic by changing the mass flow and effects the system performance eventually. By contrast, the turbomachinery efficiency is insensitive to variation in pressure and temperature due to almost constant mass flow. In addition, the S-CO2 thermophysical properties and the position of minimum temperature difference are significant influential factors of cyclic performance.

Keywords

References

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