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为了满足规模化太阳能热发电高温传热蓄热和工业余热回收利用的要求,分析并设计了NaCl-CaCl_2-MgCl_2三元熔盐体系作为传热蓄热介质。在已有的二元相图的基础上通过共形离子溶液(conformal ionic solution,CIS)模型模拟计算获得计算相图,根据计算相图所预测的低共熔点配比制样,采用热重差热联用分析仪(TG-DSC)对样品的熔点、相变潜热进行了表征,采用高温静态法对熔盐的稳定性进行了初步分析。结果表明:计算相图预测的低共熔点(424℃)与测试结果(428.5℃)基本一致,该熔盐相变潜热高达到191.7 J/g,熔盐在低于600℃下较稳定,适合作为高温潜热蓄热材料。研究为氯化物熔盐相图和热物性提供了宝贵的数据。
In order to meet the requirements of high-temperature heat storage and heat recovery and industrial waste heat recovery of large-scale solar thermal power generation, the NaCl-CaCl_2-MgCl_2 ternary molten salt system was analyzed and designed as heat transfer heat storage medium. On the basis of the existing binary phase diagram, the calculated phase diagram is obtained through the simulation calculation of the conformal ionic solution (CIS) model. According to the calculated eutectic point proportioning sample, the thermal gravity difference The melting point and latent heat of transformation were characterized by TG-DSC. The stability of molten salt was analyzed by high temperature static method. The results show that the calculated eutectic point (424 ℃) of the phase diagram is basically consistent with the test result (428.5 ℃), the latent heat of the molten salt reaches as high as 191.7 J / g, the molten salt is stable below 600 ℃, As a high-temperature latent heat storage material. The study provided valuable data for chloride phase diagrams and thermophysical properties.