The fluoride volatility method (FVM) is a technique tailored to separate uranium from fuel salt of molten salt reactors. A key challenge in R&D of the FVM is corrosion due to the presence of molten salt and corros...The fluoride volatility method (FVM) is a technique tailored to separate uranium from fuel salt of molten salt reactors. A key challenge in R&D of the FVM is corrosion due to the presence of molten salt and corrosive gases at high temperature. In this work, a frozen-wall technique was proposed to produce a physical barrier between construction materials and corrosive reactants. The protective performance of the frozen wall against molten salt was assessed using FLiNaK molten salt with introduced fluorine gas, which was regarded as a simulation of the FVM process. SS304, SS316L, Inconel 600 and graphite were chosen as the test samples. The extent of corrosion was characterized by an analysis of weight loss and scanning electron microscope studies. All four test samples suffered severe corrosion in the molten salt phase with the corrosion resistance as: Inconel 600>SS316L>graphite>SS304. The presence of the frozen wall could protect materials against corrosion by molten salt and corrosive gases, and compared with materials exposed to molten salt, the corrosion rates of materials protected by the frozen wall were decreased by at least one order of magnitude.展开更多
在熔盐堆燃料干法处理流程中,处理设备面临着严重的材质腐蚀问题。熔盐冷冻壁技术被视为保护相关设备耐受化学腐蚀的有效方法。熔盐冷冻壁厚度及温度场分布对防护效果及相关干法工艺参数有重要影响,在中心冷却式冷冻壁实验装置上采用FLi...在熔盐堆燃料干法处理流程中,处理设备面临着严重的材质腐蚀问题。熔盐冷冻壁技术被视为保护相关设备耐受化学腐蚀的有效方法。熔盐冷冻壁厚度及温度场分布对防护效果及相关干法工艺参数有重要影响,在中心冷却式冷冻壁实验装置上采用FLi Na K熔盐介质开展了冷冻壁维持的实验研究,采用中心冷棒空气冷却的方式得到了不同壁温下冷冻壁的厚度范围及反应釜内温度场分布。结合数值模拟计算了冷冻壁的传热平衡工况,并与实验值进行对比和分析,得到了较为适宜的冷冻壁厚度的调节工况。冷冻壁厚度控制工艺和釜内温度场分布可为冷冻壁工艺容器的设计提供参考。展开更多
基金supported by the Strategic Priority Research Program of the Chinese Academy of Science(No.XDA02030000)
文摘The fluoride volatility method (FVM) is a technique tailored to separate uranium from fuel salt of molten salt reactors. A key challenge in R&D of the FVM is corrosion due to the presence of molten salt and corrosive gases at high temperature. In this work, a frozen-wall technique was proposed to produce a physical barrier between construction materials and corrosive reactants. The protective performance of the frozen wall against molten salt was assessed using FLiNaK molten salt with introduced fluorine gas, which was regarded as a simulation of the FVM process. SS304, SS316L, Inconel 600 and graphite were chosen as the test samples. The extent of corrosion was characterized by an analysis of weight loss and scanning electron microscope studies. All four test samples suffered severe corrosion in the molten salt phase with the corrosion resistance as: Inconel 600>SS316L>graphite>SS304. The presence of the frozen wall could protect materials against corrosion by molten salt and corrosive gases, and compared with materials exposed to molten salt, the corrosion rates of materials protected by the frozen wall were decreased by at least one order of magnitude.
文摘在熔盐堆燃料干法处理流程中,处理设备面临着严重的材质腐蚀问题。熔盐冷冻壁技术被视为保护相关设备耐受化学腐蚀的有效方法。熔盐冷冻壁厚度及温度场分布对防护效果及相关干法工艺参数有重要影响,在中心冷却式冷冻壁实验装置上采用FLi Na K熔盐介质开展了冷冻壁维持的实验研究,采用中心冷棒空气冷却的方式得到了不同壁温下冷冻壁的厚度范围及反应釜内温度场分布。结合数值模拟计算了冷冻壁的传热平衡工况,并与实验值进行对比和分析,得到了较为适宜的冷冻壁厚度的调节工况。冷冻壁厚度控制工艺和釜内温度场分布可为冷冻壁工艺容器的设计提供参考。
