期刊
ENERGIES
卷 12, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/en12010001
关键词
double redundancy monitoring; pressure monitoring; probabilistic performance analysis; sodium-CO2 chemical reaction; CO2 Brayton cycle
资金
- Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning(KETEP) - Korea Government Ministry of Trade, Industry, and Energy [20171510102040]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20171510102040] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
One of the benefits of the supercritical CO2 Brayton cycle in Sodium-cooled Fast Reactors is an enhanced plant safety, since potential reactions of CO2 with liquid sodium have been reported to be less stringent than a sodium-water reaction found in the Rankine cycle. However, moderate chemical interactions between CO2 and liquid sodium make detecting CO2 ingress accidents harder. Thus, this paper proposes a new physics-based detection algorithm by comparing the real-time pressure measurements of two identical heat exchangers for the early detection. The CO2 ingress occurs owing to a crack at the pressure boundary wall, a certain self-recovery of structural damage does not happen over time, and an accident probabilistically starts at only one component of two. The proposed physics-based method with the probabilistic analysis was compared to the pure data-based method. Finally, the damage degradation was developed with a simplified mass and energy transfer model, and the proposed algorithm was verified with experimental data. The results show that a 99.99% detection probability can be achieved for the air ingress of 30 cc/s, which is equivalent to the 0.12 g/s CO2 ingress, in a 70 s detection time, limiting down to 0.1% false alarms due to sensor noise.
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