Development of Segmented Air-gap Coupled Electric Heating Test Device for Material Irradiation
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摘要: 为了解决研究堆高释热率区材料辐照温度精确控制技术难题，研制了材料辐照用分段式气隙耦合电加热试验装置。试验装置采用轴向分段式气隙耦合电加热的辐照温度控制方法，使其具有较大的温度调节能力。装载材料样品的辐照试验段采用轴向分段式阴阳面独立分区的结构，由两段4个独立腔室组成，每个腔室设置独立的惰性气体调节回路，并且在第一段两个腔室内设置电加热棒辅助气隙进行辐照温度调节。利用该装置进行的堆内辐照试验结果表明：试验装置在反应堆高注量率区能够将材料辐照温度有效控制在335~365℃，电加热棒独立控温能力达30℃。研制的装置大幅提高了辐照温度控制精度，实现了辐照温度在线精确调节与控制，达到了材料辐照精细化控温的目的。Abstract: In order to solve the technical problem of precise control for the material irradiation temperature in high heat release rate region of the research reactor, the segmented air-gap coupled electric heating test device for the material irradiation was developed. The irradiation temperature control method of axial segmented air gap coupling electric heating was adopted to enable the irradiation device to have a large temperature regulation ability. The structure of axial segmented yin-yang plane independent partition was adopted in the test device. The irradiation test section loaded with material samples was composed of four independent chambers, each of which was equipped with an independent inert gas regulating circuit, and the two chambers on the first segment were equipped with the electric heating rod auxiliary air gap for the irradiation temperature regulation. This device was used to carry out irradiation test in the research reactor, and the results show that the material irradiation temperature for the test device can be effectively controlled at 335~365℃ in high flux rate region of the research reactor, and the independent temperature control ability of the electric heating rod can reach 30℃. The developed device greatly improves the accuracy of irradiation temperature control, realizes on-line accurate adjustment and control of irradiation temperature, and achieves the purpose of fine temperature control for material irradiation.
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图 1 试验装置结构示意图
1—下端头；2—辐照试验段；3—辅助密封段；4—主螺栓；5—垫圈；6—气管组件
Figure 1. Schematic Diagram of Test Device Structure
图 2 辐照试验段结构示意图 （单位：mm）
1—定位管；2—底法兰；3—下定位块；4—垫板；5—第二段样品层；6—辐照罐；7—上定位块；8—弹簧；9—隔板法兰；10—中部支撑弧形壳；11—第一段样品层；12—顶法兰；13—连接管；14—导向管
Figure 2. Schematic Diagram of Irradiation Test Section Structure
图 3 电加热棒结构示意图 （单位：mm）
1—铠装引线；2—电极；3—包壳管；4—热电偶监测元件；5—加热电阻丝；6—堵头
Figure 3. Schematic Diagram of Electric Heating Rod Structure
图 4 材料辐照热工计算理论模型
CONV—对流换热；C—导热；R—辐射换热
Figure 4. Theoretical Model of Material Irradiation Thermal Calculation
图 5 辐照试验段材料样品温度分布云图（纯He）
Figure 5. Temperature Distribution Cloud Diagram of Material Samples in Irradiation Test Section (Pure He)
图 6 不同段样品的温度分布线图（纯He）
Figure 6. Temperature Profiles of Samples in Different Segments (Pure He)
图 7 不同段样品的温度分布线图（15%Ar）
Figure 7. Temperature Profiles of Samples in Different Segments (15%Ar)
图 8 电加热调温能力试验结果
Figure 8. Temperature Regulating Capacity Test Results of Electric Heating
表 1 气隙厚度计算结果
Table 1. Calculation Results of Air Gap Thickness
段数 第一段（由上至下） 第二段（由上至下） 序号 1 2 3 4 5 6 7 8 内侧气隙厚度/mm 0.17 0.14 0.14 0.12 0.12 0.14 0.14 0.17 外侧气隙厚度/mm 0.24 0.20 0.16 0.16 0.16 0.16 0.20 0.24 
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