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针对工程应用中无机盐储热材料铸态组织的高温导热系数值与实验室常规测得值不一致的问题,基于恒定升温速率法建立数学模型,设计并搭建无机盐铸态组织高温导热系数测量装置,并详述测试方法。以分析纯NaCl为例,测得530~650℃之间平均导温系数为9.39×10-7m2/s,平均导热系数为1.72W/(m·K)。温度-时间拟合直线与理论预测一致;并以测得导热系数作为已知参数进行有限元模拟,时间-温度曲线与实验值吻合良好。证明该测量方法获得的导热系数值准确可靠,且该测量装置能获得某一温度段上任一温度点处的导温系数和导热系数值,测试温度范围更适于中高温段;装置简单易建,对样品限制小,操作简便。
In view of the problem that the high temperature thermal conductivity value of the as-cast structure of inorganic salt heat storage material in engineering application is inconsistent with the conventional measured value in the laboratory, a mathematical model is established based on the constant heating rate method, and a device for measuring the high temperature thermal conductivity of the as-cast inorganic structure , And detailed test methods. Taking analytical pure NaCl as an example, the average thermal conductivity coefficient between 530 and 650 ℃ was 9.39 × 10-7m2 / s and the average thermal conductivity was 1.72W / (m · K). The temperature-time fitting line is consistent with the theoretical prediction. The finite element simulation is carried out using the measured thermal conductivity as a known parameter, and the time-temperature curve is in good agreement with the experimental data. It is proved that the thermal conductivity obtained by the measurement method is accurate and reliable, and the measuring device can obtain the thermal conductivity coefficient and the thermal conductivity coefficient at any temperature point in a certain temperature range, and the test temperature range is more suitable for medium and high temperature sections; , Small sample limit, easy to operate.