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球床等效导热系数是反映高温气冷堆球床型堆芯宏观热量导出能力的特征参数。为提高中国高温气冷堆设计计算及安全分析能力,清华大学核研院研制了高温气冷堆堆芯全尺寸球床等效导热系数测量实验装置,可进行静态石墨球床在真空及氦气条件下的等效导热系数测量实验。通过对该实验装置的结构进行适当简化,建立了模拟其高温、真空条件下辐射、导热传热特性的二维模型。利用该模型计算了实验装置内的稳态、动态传热特性,可以对球床区径向温度分布、上下保温层材质不同带来的影响、中心发热体超温情况、升降温过程等作出先期理论评估,给出进一步实验的指导性建议。
The equivalent thermal conductivity of the ball bed is a characteristic parameter that reflects the macro-caloric derivation ability of the bed-type core of a high-temperature gas-cooled reactor. In order to improve the design calculation and safety analysis capability of HTGR in China, Tsinghua University’s Nuclear Research Institute has developed an experimental device for measuring the equivalent thermal conductivity of a full-size ball bed of a HTGR core, which can be used in vacuum and helium Under the conditions of the equivalent thermal conductivity measurement experiment. Through the appropriate simplification of the structure of the experimental device, a two-dimensional model was established to simulate the radiation and heat transfer characteristics under high temperature and vacuum conditions. The model was used to calculate the steady state and dynamic heat transfer characteristics in the experimental device. The model can make the radial temperature distribution in the bed region, the influence of the upper and lower insulation materials, the over-temperature condition of the central heating body, the process of raising and lowering the temperature, etc. Theoretical evaluation, giving further guidance for the experiment.