Thermal-mechanical Analysis and Optimization on the Critical Components of the High Temperature PbLi Loop for CFETR

Yue Yu,Kecheng Jiang,Lei Chen,Songlin Liu

Fusion Engineering and Design（2025）SCI 3区

Chinese Acad Sci

Cited 0|Views3

Abstract

In the support of Comprehensive Research Facility for Fusion Technology (CRAFT) Program of China, the high temperature PbLi loop is under development, which will be employed to experimentally study the MagnetoHydroDynamics (MHD) effects for the supercritical carbon dioxide (s-CO2) cOoled Lithium-Lead (COOL) blanket. In the current design, the temperature of PbLi is operating in the range of 300 degrees C-700 degrees C, and the material for components is carefully selected in view of the baseline 550 degrees C. When the temperature is higher than this value, the nickel-based alloy that can resist high temperature is adopted. Otherwise, the stainless steel 316 is used. In this loop, there are two components that are considered as the most critical and fragile due to the highest operating temperature up to 700 degrees C, including the main heater and primary mixer. Therefore, the thermalmechanical analysis and optimization on these two critical components are performed in this paper, and the stress results are evaluated according to the relevant standards. For the main heater, both the PbLi outlet temperature and the structural temperature meet the requirements under the maximum operating condition. Although the stress in some regions exceeds the allowable limits, it can be solved during the manufacturing process. For the primary mixer, the optimization is performed from three aspects, i.e. structural design, structural material, and increasing cold PbLi temperature. The results indicate that one of the designs exhibits better stress performance. Tungsten shows satisfying mechanical properties, but there are challenges in machining. While N06625 can only meet the stress criteria of the external components. The thermal stress is decreased with the reduction of the temperature difference between the hot and cold PbLi. Furthermore, the mixing performance is effectively enhanced by extending the length of the helical and the outlet nozzle. The results can provide data support for the processing and manufacturing of these two critical components to ensure the safe operation of the PbLi loop.

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Key words

COOL blanket,PbLi loop,Critical components,Thermal-mechanical analysis

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