600-800℃混合熔盐传热储热材料设计构建及其在非常规条件下传热强化机理

超临界二氧化碳（sCO2)太阳能热发电被称为第三代太阳能热发电技术，是一种最有可能将太阳能热发电成本降至化石能源发电成本的先进太阳能发电技术。sCO2太阳能热发电透平进气参数的高温需求，迫切需要与之匹配的600-800℃低成本传热蓄热介质和高温热源换热器。本项目研究旨在通过混合熔盐相图设计理论设计构建600-800℃低成本宽液体温域的高温传热蓄热材料，在获得其热物性随温度变化关联式的基础上，探寻纳米粒子对混合熔盐热物性影响机理及抗腐蚀规律，探析sCO2对流传热耦合作用下高温混合熔盐流动与传热强化规律，明晰非常规条件（高温、高压、超临界、微纳尺度等)下高温熔盐-sCO2换传热器优化设计方法及性能影响机理，研究结果为sCO2太阳能热发电提供低成本高稳定性传热蓄热介质及非常规条件下熔盐-sCO2换传热器设计方法与传热强化机理。研究内容具有十分重要的学术价值和工程应用背景。

Supercritical carbon dioxide（sCO2) solar thermal Power is known as the third generation concentrated solar thermal power technology, which is most likely to reduce the cost of solar thermal power to that of the coal-fired power. The high temperature demand at turbine inlet for the solar thermal power urgently requires the matching low cost heat transfer and storage medium, and the high temperature heat exchanger (operating temperature at 600-800℃) that used for te heat source of sCO2 Brayton cycle. This project aims to design and prepare the low cost mixed molten salt using the phase diagrams design theory, which is mixed by the same cationic salt and can be used as liquid in a wide range of temperature. After obtain its thermal physical properties correaltion with temperature, the effect of nanoparticles on its physical and cheimical properties will be explored, and the flow and heat trasfer mechnism of molten salt coupling with the heat trasnfer of sCO2 will be analyzed. And then the high temperature of molten salt-sCO2 heat exchanger will be designed and its heat transfer properties will be tested under the off-normal conditions (such as high temperature, high pressure, supercritical, micro and nano dimision). The results can be a base for the application of solar thermal power with sCO2 Brayton cycle.