Abstract: Based on the requirements of HL-2M baking insulation requirement, it was determined that 
ceramic fiber and nanoscale microporous material were used as insulation material for HL-2M vacuum vessel 
through finite element analysis and prototype test. It is found that the thermal conductivity of the insulation layer 
is less than 0.027W⋅m−1·℃⁻¹ at 30℃ and less than 0.038W⋅m⁻¹·℃⁻¹ at 300℃. For the chosen insulation layer of 
25mm thick, when the temperature of the hot surface is 300℃ and reaches a steady state, the cold surface can be 
controlled below 85℃, the temperature of the coil side is lower than 60℃, and the overall heat loss is less than 
12kW, which meets the baking requirements of the HL-2M vacuum vessel. 

Key words:  HL-2M tokamak, Vacuum vessel, Thermal insulation material, Thermal analysis, Insulation 
experiment 

摘要： 基于 HL-2M 真空室烘烤保温要求，通过有限元分析和原型件实验确定采用陶瓷纤维与纳米级微孔材
料组合作为 HL-2M 真空室保温材料。在 30℃时，保温层的导热系数小于 0.027W⋅m⁻¹·℃⁻¹；300℃时，导热系数
小于 0.038W⋅m⁻¹·℃⁻¹。在保温层厚度 25mm、热面温度 300℃且达到稳态时，冷面可控制在 85℃以下，线圈侧的
温度低于 60℃，整体热损失小于 12kW，满足 HL-2M 真空室烘烤需求。 

关键词: HL-2M 装置；真空室；保温材料；传热分析；隔热实验