On October 8, the liquid metal lithium experimental loop developed by the project team of the Institute of Nuclear Energy Safety Technology, Hefei Institute of Material Science, Chinese Academy of Sciences has achieved 1500K ultra-high temperature and stable operation for 1,000 hours.
During the development of the circuit, the project team overcame the difficulties of structural stress coordination, immersion measurement and flow stability control of the device under ultra-high temperature liquid lithium working fluid environment. At present, the circuit has carried out a series of high temperature refractory alloys in the 1400 ~ 1500K temperature zone flowing lithium environment corrosion resistance research experiments, for ultra-high temperature liquid lithium and structural materials compatibility and other studies provide an important experimental platform.
The project team of the Institute of Nuclear Energy Safety has long been engaged in the design and development of small advanced nuclear energy systems that use special liquid metals as the cooling medium. Liquid lithium or lithium alloys have the advantages of high operating temperature, good thermal conductivity, and low density. They are the main coolant materials for high-power space reactors and future fusion reactors. The completion and stable operation of the ultra-high-temperature lithium experimental circuit marks a new breakthrough in key technology of liquid metal coolant in China's advanced nuclear energy system.
Figure 1 Ultra-high temperature liquid metal lithium experimental circuit
Figure 2 Corrosion morphology of typical materials in 1473K high-temperature lithium
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