Thermal properties enforcement of carbonate ternary via lithium fluoride: A heat transfer fluid for concentrating solar power systems
Thermal properties enforcement of carbonate ternary via lithium fluoride: A heat transfer fluid for concentrating solar power systems
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通过氟化锂增强碳酸盐三元材料的热性能：用于聚光太阳能发电系统的传热流体
DOI：
10.1016/j.renene.2017.04.050
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发表时间：
2017-10
期刊：
影响因子：
8.7
通讯作者：
Sun Liangliang
中科院分区：
文献类型：
--
作者：
Zhang Zhaoli;Yuan Yanping;Zhang Nan;Sun Qinrong;Cao Xiaoling;Sun Liangliang
制备了一种新型li2co3 - na2co3 - k2co3共晶材料，并将其作为聚光太阳能发电系统的传热流体，消除了其工作温度范围有限、比热和导热系数低的缺点。采用静态熔融法，选择li2co3 - na2co3 - k2co3为最佳候选材料，li2co3 - na2co3 - k2co3的LiF含量为15.0 wt.%，为x射线衍射测定的简单物理混合物。结果表明，在升温速率为10℃/min的条件下，lif - li2co3 - na2co3 - k2co3的熔点为368℃，温度上限为753℃，可以有效地用于高温CSP系统的蓄热换热。在400 ~ 600℃的温度范围内，液态季元的平均比热为1.917 J/（g·℃），明显大于原始三元共晶。固体lif - li2co3 - na2co3 - k2co3的导热系数在320℃时达到1.021 W/（m·°C）的稳定水平。用阿基米德原理测试的改进共晶密度约为1.95 g/cm3。综上所述，lif - li2co3 - na2co3 - k2co3可以作为高温光热电站储热换热的理想换热流体。该研究将为熔盐基传热流体的进一步改进提供有用的信息。
A novel eutectic of Li2CO3-Na2CO3-K2CO3improved by LiF, when employed as a heat transfer fluid in concentrating solar power systems, is prepared to eliminate the disadvantage of limited operating temperature range and low specific heat as well as thermal conductivity. Using the static melting method, Li2CO3-Na2CO3-K2CO3with 15.0 wt.% LiF which is simply physical mixture determined by X-ray diffraction, is chosen as the optimized candidate. Results indicate that, at 10 °C/min of heating rate, LiF-Li2CO3-Na2CO3-K2CO3reached melting point of 368 °C and upper temperature limit of 753 °C, allowing it to be effectively employed in thermal storage and heat transfer in high temperature CSP systems. During temperature range from 400 to 600 °C, the liquid quaternary exhibited notably mean specific heat of 1.917 J/(g·°C), which is larger than that of the original ternary eutectic. Thermal conductivity of solid LiF-Li2CO3-Na2CO3-K2CO3reached the stable level of 1.021 W/(m·°C) at 320 °C. Density of improved eutectic tested by the archimedean principle is approximately 1.95 g/cm3. In conclusion, LiF-Li2CO3-Na2CO3-K2CO3can be employed as the admirable heat transfer fluid for thermal storage and heat transfer in high-temperature CSP plants. This investigation will provide useful information for further improvement of molten salt based heat transfer fluids.
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