Measurement of Viscosity of Alkali Fluoride/Carbonate Eutectic Molten Salt by Rotating Viscometer Method (CAT#: STEM-PPA-0032-YJL)

Introduction

Molten salts have been regarded as one of the most promising media for concentrating solar power (CSP) system due to their excellent heat storage/transfer performances. Recently, heat storage/transfer media used at high temperature have been recommended for higher energy conversion efficiency. In pursuit of molten salt systems with high stability under high temperature, fluoride and carbonate molten salts are treated as the potential candidates for application.
Multicomponent fluoride molten salts generally melted above 400 °C and they remain thermal stable even though up to 1500 °C. It seems a good choice to use them at high temperature, but fluoride molten salts are so generally corrosive that the compatible materials is rarely available, moreover, they are expensive. On the contrary, molten carbonates are cheap and less corrosive, but their thermal stability range are so small (from 400 to 700 °C) that their application is limited. Therefore, researchers proposed to prepare the reciprocal molten salts of fluoride and carbonate which may have the advantages of the both molten salts. In fact, it is significant to obtain the accurate thermophysical parameters because they are necessary for the thermal hydraulic calculation and safety analysis of the CSP system, such as density, viscosity, and thermal conductivity.