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Design of new molten salt thermal energy storage material for solar thermal power plant

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Listed:
  • Peng, Qiang
  • Yang, Xiaoxi
  • Ding, Jing
  • Wei, Xiaolan
  • Yang, Jianping

Abstract

In order to obtain molten salt with lower melting point, higher thermal stability and reduced cost relative to previously available materials, a variety of molten salt mixtures of alkali nitrates are investigated by experimental methods. However, since measurements are generally expensive and time-consuming, it is of interest to be able to predict melting point and the component of multi-component systems by using the numerical methods. In this paper, eutectic point and component of a new kind of the quaternary reciprocal system (K, Na/NO2, Cl, NO3) are determined firstly by conformal ionic solution theory. Then thermal stability of the mixtures that show a lower melting point is measured by thermogravimetric analysis device. Experimental results show the agreement between measurements and calculations is found to be very good. This kind of molten salt has a lower melting point, 140°C. It is thermally stable at temperatures up to 500°C, and may be used up to 550°C for short periods. Besides, this molten salt has a reduced cost relative to previous low-melting nitrate mixtures due to the elimination of cesium nitrate and lithium nitrate.

Suggested Citation

  • Peng, Qiang & Yang, Xiaoxi & Ding, Jing & Wei, Xiaolan & Yang, Jianping, 2013. "Design of new molten salt thermal energy storage material for solar thermal power plant," Applied Energy, Elsevier, vol. 112(C), pages 682-689.
    • Handle: RePEc:eee:appene:v:112:y:2013:i:c:p:682-689
    DOI: 10.1016/j.apenergy.2012.10.048
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    References listed on IDEAS

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    1. Kenisarin, Murat M., 2010. "High-temperature phase change materials for thermal energy storage," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(3), pages 955-970, April.
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