Analysis on stress and deformation of large-scale concentric recuperator for high-temperature PbLi loop

Abstract

A lead lithium (PbLi) loop named as DRAGON-V was constructed in China to test key technologies of material corrosion, thermal-hydraulics, safety issues, etc for PbLi blanket of fusion reactor. The concentric recuperator, one of the most important components, was used to recover the enthalpy in the loop. To design the concentric recuperator structure, the tangent angle θ between straight pipe and elbow as well as the bending radius R for U-type connecting elbow were analyzed, respectively. It was indicated that the elbow presented well thermal deformation-absorbing function and reduced the thermal stress.There was a little effect on the deformation and heat transfer for the variation of R and θ, but the stress intensity increased with bending radius R and decreased with tangent angle θ. The results showed that the stress intensity in the structure with θ = 5°and R = 1.5D was smaller than the others. And the optimized structure was evaluated according to standard of Steel Pressure Vessel-Design by Analysis, the structural strength met the design requirement, and large margin was kept for engineering application.

Numerical Simulation of Heat Transfer Characteristics between Liquid Lithium Lead and Oil

“…Before the commercial application of fusion energy can be realized, a series of key technical problems of liquid LiPb cladding must be solved, and the liquid LiPb experimental loop is the necessary experimental platform for studying these key technical problems [5,6]. The FDS team of Chinese Academy of Sciences has continuously carried out the design, construction and experimental research of DRAGON series lithium lead experimental loop for many years, which has carried out a good foundation for the research of liquid lithium lead cladding in China [7][8][9].…”