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research-article

Experimental Test of Properties of KCl-MgCl2 Eutectic Molten Salt for Heat Transfer and Thermal Storage Fluid in Concentrated Solar Power Systems

[+] Author and Article Information
Xiankun Xu

Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, AZ 85721, USA
xiankunxu@email.arizona.edu

Xiaoxin Wang

Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, AZ 85721, USA
wangxx850815@email.arizona.edu

Peiwen Li

Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, AZ 85721, USA
peiwen@email.arizona.edu

Yuanyuan Li

School of Energy, Power, and Mechanical Engineering, North China Electric Power University, Beijing 102206, China; Visiting scholar in the University of Arizona
yuanyuanli@ncepu.edu.cn

Qing Hao

Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, AZ 85721, USA
qinghao@email.arizona.edu

Bo Xiao

Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, AZ 85721, US
boxiao@email.arizona.edu

Hassan Elsentriecy

Department of Chemical and Environmental Engineering, The University of Arizona, Tucson, AZ 85721, USA
he@metoxs.solutions

Dominic Gervasio

Department of Chemical and Environmental Engineering, The University of Arizona, Tucson, AZ 85721, USA
gervasio@email.arizona.edu

1Corresponding author.

ASME doi:10.1115/1.4040065 History: Received January 22, 2018; Revised April 11, 2018

Abstract

The eutectic mixture of MgCl2-KCl molten salt is a high temperature heat transfer and thermal storage fluid able to be used at temperatures up to 800 oC in concentrating solar thermal power systems. The molten salt thermophysical properties are reported including vapor pressure, heat capacity, density, viscosity, thermal conductivity, and the corrosion behavior of nickel-based alloys in the molten salt corrosion at high temperatures. Correlations of the measured properties as functions of molten salt temperatures are presented for industrial applications. The test results of tensile strength of two nickel-based alloys exposed in the molten salt at a temperature of 800 oC from one-week length to sixteen-week length are reported. It was found that the corrosion and strength loss is rather low when the salt is first processed to remove water and oxygen.

Copyright (c) 2018 by ASME
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