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硝酸盐熔盐及其太阳能混合物和共晶混合物的热特性

Thermostatic properties of nitrate molten salts and their solar and eutectic mixtures.

作者信息

D'Aguanno B, Karthik M, Grace A N, Floris A

机构信息

Centre for Nanotechnology Research, VIT University, Vellore, 632014, Tamil Nadu, India.

Centre for Nanomaterials, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad, 500005, India.

出版信息

Sci Rep. 2018 Jul 11;8(1):10485. doi: 10.1038/s41598-018-28641-1.

DOI:10.1038/s41598-018-28641-1
PMID:29992980
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6041306/
Abstract

Nitrate molten salts are extensively used for sensible heat storage in Concentrated Solar Power (CSP) plants and thermal energy storage (TES) systems. They are the most promising materials for latent heat storage applications. By combining classical molecular dynamics and differential scanning calorimetry experiments, we present a systematic study of all thermostatic, high temperature properties of pure KNO and NaNO salts and their eutectic and "solar salt" mixtures, technologically relevant. We first study, in solid and liquid regimes, their mass densities, enthalpies, thermal expansion coefficients and isothermal compressibilities. We then analyze the c and c specific heats of the pure salts and of the liquid phase of the mixtures. Our theoretical results allow to resolve a long-standing experimental uncertainty about the c(T) thermal behaviour of these systems. In particular, they revisit empirical laws on the c(T) behaviour, extensively used at industrial level in the design of TES components employing the "solar salt" as main storage material. Our findings, numerically precise and internally consistent, can be used as a reference for the development of innovative nanomaterials based on nitrate molten salts, crucial in technologies as CSP, waste heat recovery, and advanced adiabatic compressed air energy storage.

摘要

硝酸盐熔盐广泛用于聚光太阳能发电（CSP）厂的显热储存和热能储存（TES）系统。它们是潜热储存应用中最有前景的材料。通过结合经典分子动力学和差示扫描量热法实验，我们对纯KNO和NaNO盐及其共晶和“太阳能盐”混合物的所有恒温高温性质进行了系统研究，这些性质在技术上具有相关性。我们首先研究了它们在固态和液态下的质量密度、焓、热膨胀系数和等温压缩率。然后我们分析了纯盐和混合物液相的定压比热容和定容比热容。我们的理论结果有助于解决这些系统定压比热容随温度变化（c(T)）热行为方面长期存在的实验不确定性。特别是，它们重新审视了在工业层面广泛用于设计以“太阳能盐”作为主要储存材料的TES组件时关于c(T)行为的经验定律。我们的研究结果在数值上精确且内部一致，可作为基于硝酸盐熔盐的创新纳米材料开发的参考，这在CSP、废热回收和先进绝热压缩空气储能等技术中至关重要。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/b30799e6d79f/41598_2018_28641_Fig12_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/b30799e6d79f/41598_2018_28641_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/55a2e336577b/41598_2018_28641_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/472d08f7fcdb/41598_2018_28641_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/0f78bef18ce3/41598_2018_28641_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/ec4b56d11c3c/41598_2018_28641_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/e06d5bfb4660/41598_2018_28641_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/9d452ecd209e/41598_2018_28641_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/eb1708ef6984/41598_2018_28641_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/94881c77bd0d/41598_2018_28641_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/8fb245838a46/41598_2018_28641_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/28bb09ab3734/41598_2018_28641_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/a64e140eaa56/41598_2018_28641_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b1e5/6041306/b30799e6d79f/41598_2018_28641_Fig12_HTML.jpg

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