Degradation of a commercial ternary molten salt under various atmospheres for CSP applications

  1. Pérez, Francisco Javier
  2. de Miguel, María Teresa
  3. Lasanta, María Isabel
  4. Encinas-Sánchez, Víctor
  5. García-Martín, Gustavo
  6. De Arriba, Rubén
Actas:
SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems

ISSN: 0094-243X

Año de publicación: 2019

Tipo: Aportación congreso

DOI: 10.1063/1.5117742 GOOGLE SCHOLAR lock_openAcceso abierto editor

Resumen

This research aims to study the degradation and the changes in physicochemical properties of a ternary moltensalt mixture, commercially known as Hitec, in contact with a nitrogen and an air atmosphere. The degradation of the saltwas determined by chemical analysis of the NO3- and NO2- anions and DSC determination of the melting and freezing pointof the mixture. To this end, isothermal tests at 500 ºC were performed for 1000 h. A deeper study of the evolution of thesalt under air atmosphere was carried out until 2000 h. It was found that the mixture properties studied remain invariablewhen it was operated under N2 atmosphere. The use of atmospheric air resulted in a progressive increase in melting andfreezing points due to the nitrite transformation to nitrate. The effect of the degradation could be observed in the early hoursof the test and after 2000 h of test, the system had not reached and steady state and the degradation progress was stillongoing.I

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