MSR Supercritical Carbon Dioxide Brayton Cycle System and Thermodynamic Analysis

Lu Heng; Zhao Heng; Dai Ye; Chen Xingwei; Jia Guobin; Zou Yang

doi:10.13832/j.jnpe.2022.02.0032

Volume 43 Issue 2

Apr. 2022

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Lu Heng, Zhao Heng, Dai Ye, Chen Xingwei, Jia Guobin, Zou Yang. MSR Supercritical Carbon Dioxide Brayton Cycle System and Thermodynamic Analysis[J]. Nuclear Power Engineering, 2022, 43(2): 32-39. doi: 10.13832/j.jnpe.2022.02.0032

Citation:

Lu Heng, Zhao Heng, Dai Ye, Chen Xingwei, Jia Guobin, Zou Yang. MSR Supercritical Carbon Dioxide Brayton Cycle System and Thermodynamic Analysis[J]. Nuclear Power Engineering, 2022, 43(2): 32-39. doi: 10.13832/j.jnpe.2022.02.0032

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MSR Supercritical Carbon Dioxide Brayton Cycle System and Thermodynamic Analysis

doi: 10.13832/j.jnpe.2022.02.0032

Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China

Received Date: 2021-02-02
Accepted Date: 2021-02-02
Rev Recd Date: 2021-10-29
Publish Date: 2022-04-02

Abstract

Abstract

Molten salt reactor (MSR) can realize on-line packing and post-processing, and the outlet temperature is higher, so it shall be equipped with an innovative cycle mode that matches its outlet temperature, and can achieve higher cycle efficiency. In this paper, a supercritical carbon dioxide (SCO₂) Brayton cycle system is designed based on the small modular molten salt reactor (smTMSR-400) designed by Shanghai Institute of Applied Physics, Chinese Academy of Sciences. The effects of split ratio, compressor/turbine efficiency, outlet temperature of main compressor and heat exchange temperature difference/resistance of low temperature heat exchanger on SCO₂ Brayton cycle system are analyzed by using the control variable method. The analysis results show that: ①there is an optimal split ratio to make the temperature difference between the two sides of the low temperature heat exchanger equal; ②compared with the compressor efficiency, the equal-amplitude turbine efficiency improvement can make the system cycle efficiency and exergy efficiency higher; ③ the increase in the outlet pressure of the main compressor has a positive impact on the system, but the cycle efficiency/exergy efficiency and its slope gradually decrease; ④the heat exchange temperature difference and flow resistance of the heat exchanger bring quantifiable burden to the system cycle: for every 10 K increase in the heat exchange temperature difference, the cycle efficiency decreases by 1.85% and exergy efficiency decreases by 2.70%; When the flow resistance increases by 1 MPa, the cycle efficiency decreases by 6.58% and exergy efficiency decreases by 10.22%. At last ,this paper designs 5 physical reference schemes based on the analysis results and system exergy changes.
- MSR,
- SCO₂,
- Brayton,
- Thermodynamic analysis

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References(14)

References

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