Investigation on the Compatibility of Nanoporous Aerogel Thermal Insulation Materials in High-temperature Sodium
ZHANG Jinquan1,2, RUAN Zhangshun2, QIN Bo2, FU Xiaogang2, LONG Bin2,*, ZHOU Zhangjian3, YUN Di4
1 China Nuclear Power Engineering Co., Ltd., Beijing 100840, China 2 China Institute of Atomic Energy, Beijing 102413, China 3 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 4 School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Abstract: It is important to ensure the equipment of sodium-cooled fast reactor operates efficiently and safely, as well as the reactor operates stably. The application of new silica nanoporous aerogel thermal insulation material in sodium-cooled fast reactor system was explored, and the high-temperature performance and sodium fire resistance of the materials were studied. This paper presents the experimental study on the compatibility behavior of a new type of nanoporous aerogel thermal insulation material in high-temperature sodium for sodium-cooled fast reactor. The temperature of the whole combustion process of the insulation material with sodium was recorded and observed, and the composition change of the material before and after combustion was analyzed. The test results show that the nanoporous aerogels insulation materials will release CO, CO2 and other gases after baking at high temperature in air, but the composition remains unchanged. When sodium leakage occurs, if the sodium is not burning, the insulation material is completely filled with sodium, and its properties are changed. However, after the sodium leakage combustion happens, it will directly cause the combustion of thermal insulation materials, and the combustion temperature of sodium increases, the consequences of the accident were aggravated. After the combustion, the thermal insulation materials become black and brittle, and the interior is full of sodium particles, so the properties of thermal insulation materials are completely changed, and the potential hazards were easily caused. There are great safety risks while the silica nanoporous aerogel thermal insulation material is used in sodium-cooled fast reactor system under the condition of sodium leakage.
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2025, Vol. 39 
