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Research Papers

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, Xiaoxin Wang, Qing Hao, Bo Xiao

Department of Aerospace and
Mechanical Engineering,
The University of Arizona,
Tucson, AZ 85721

Peiwen Li

Department of Aerospace and Mechanical
Engineering,
The University of Arizona,
Tucson, AZ 85721
e-mail: peiwen@email.arizona.edu

Yuanyuan Li

School of Energy, Power, and Mechanical
Engineering,
North China Electric Power University,
Beijing 102206, China

Hassan Elsentriecy, Dominic Gervasio

Department of Chemical and
Environmental Engineering,
The University of Arizona,
Tucson, AZ 85721

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received January 22, 2018; final manuscript received April 11, 2018; published online May 29, 2018. Assoc. Editor: Marc Röger.

J. Sol. Energy Eng 140(5), 051011 (May 29, 2018) (9 pages) Paper No: SOL-18-1037; doi: 10.1115/1.4040065 History: Received January 22, 2018; Revised April 11, 2018

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 °C 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 °C from 1-week length to 16-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.

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References

Skumanich, A. , 2010, “ CSP: Developments in Heat Transfer and Storage Materials,” Renewable Energy Focus, 11(5), pp. 40–43. [CrossRef]
Kearney, D. , Kelly, B. , Herrmann, U. , Cable, R. , Pacheco, J. , Mahoney, R. , Price, H. , Blake, D. , Nava, P. , and Potrovitza, N. , 2004, “ Engineering Aspects of a Molten Salt Heat Transfer Fluid in a Trough Solar Field,” Energy, 29(5–6), pp. 861–870. [CrossRef]
Yang, X. P. , Yang, X. X. , Ding, J. , Shao, Y. Y. , Qin, F. G. F. , and Jiang, R. H. , 2012, “ Criteria for Performance Improvement of a Molten Salt Thermocline Storage System,” Appl. Therm. Eng., 48, pp. 24–31. [CrossRef]
Brosseau, D. W. , Kelton, J. , Ray, D. , Edgar, M. , Chisman, K. , and Emms, B. , 2005, “ Testing of Thermocline Filler Materials and Molten-Salt Heat Transfer Fluids for Thermal Energy Storage Systems in Parabolic Trough Power Plants,” ASME J. Sol. Energy Eng., 127(1), pp. 109–116. [CrossRef]
Herrmann, U. , Kelly, B. , and Price, H. , 2004, “ Two-Tank Molten Salt Storage for Parabolic Trough Solar Power Plants,” Energy, 29(5–6), pp. 883–893. [CrossRef]
Ma, Z. , and Turchi, C. , 2011, “ Advanced Supercritical Carbon Dioxide Power Cycle Configurations for Use in Concentrating Solar Power Systems,” Supercritical CO2 Power Cycle Symposium, Boulder, CO, May 24–25, Paper No. NREL/CP-5500-50787. https://www.nrel.gov/docs/fy11osti/50787.pdf
Neises, T. , and Turchi, C. , 2014, “ Comparison of Supercritical Carbon Dioxide Power Cycle Configurations With an Emphasis on CSP Applications,” Energy Procedia, 49, pp. 1187–1196. [CrossRef]
Abdoly, M. A. , and Rapp, D. , 1982, “ Theoretical and Experimental Studies of Stratified Thermocline Storage of Hot Water,” Energy Convers. Manage., 22(3), pp. 275–285. [CrossRef]
Canada, S. , Brosseau, D. A. , and Price, H. , 2006, “ Design and Construction of the APS 1 MWe Parabolic Trough Power Plant,” ASME Paper No. ISEC2006-99139.
Cabaleiro, D. , Pastoriza-Gallego, M. J. , Piñeiro, M. M. , Legido, J. L. , and Lugo, L. , 2012, “ Thermophysical Properties of (Diphenyl Ether + Biphenyl) Mixtures for Their Use as Heat Transfer Fluids,” J. Chem. Thermodyn., 50, pp. 80–88. [CrossRef]
Pacheco, J. E. , and Showalter, S. K. , 2002, “ Development of a Molten-Salt Thermocline Thermal Storage System for Parabolic Trough Plants,” ASME J. Sol. Energy Eng., 124(2), pp. 153–159. [CrossRef]
Raade, J. W. , and Padowitz, D. , 2011, “ Development of Molten Salt Heat Transfer Fluid With Low Melting Point and High Thermal Stability,” ASME J. Sol. Energy Eng., 133(3), p. 031013. [CrossRef]
Bradshaw, R. W. , and Siegel, N. P. , 2008, “ Molten Nitrate Salt Development for Thermal Energy Storage in Parabolic Trough Solar Power Systems,” ASME Paper No. ES2009-90140.
Kenisarin, M. M. , 2010, “ High-Temperature Phase Change Materials for Thermal Energy Storage,” Renewable Sustainable Energy Rev., 14(3), pp. 955–970. [CrossRef]
Li, P. W. , Molina, E. , Wang, K. , Xu, X. , Dehghani, G. , Kohl, A. , Hao, Q. , Kassaee, M. H. , Jeter, S. M. , and Teja, A. S. , 2016, “ Thermal and Transport Properties of NaCl–KCl–ZnCl2 Eutectic Salts for New Generation High-Temperature Heat-Transfer Fluids,” ASME J. Sol. Energy Eng., 138(5), p. 054501. [CrossRef]
Li, Y. Y. , Xu, X. K. , Wang, X. X. , Li, P. W. , Hao, Q. , and Xiao, B. , 2017, “ Survey and Evaluation of Equations for Thermophysical Properties of Binary/Ternary Eutectic Salts From NaCl, KCl, MgCl2, CaCl2, ZnCl2 for Heat Transfer and Thermal Storage Fluids in CSP,” Sol. Energy, 152, pp. 57–79. [CrossRef]
Li, C. J. , Li, P. W. , Wang, K. , and Molina, E. E. , 2014, “ Survey of Properties of Key Single and Mixture Halide Salts for Potential Application as High Temperature Heat Transfer Fluids for Concentrated Solar Thermal Power Systems,” AIMS Energy, 2(2), pp. 133–157. [CrossRef]
Dehghani, G. , Xu, X. K. , and Li, P. W. , 2016, “ Measurement of the Basic Properties of Ternary Eutectic Chloride Salts Used as High Temperature Heat Transfer Fluids and Thermal Storage Media,” ASME Paper No. ES2016-59190.
Kipouros, G. J. , and Sadoway, D. R. , 2001, “ A Thermochemical Analysis of the Production of Anhydrous MgCl2,” J. Light Met., 1(2), pp. 111–117. [CrossRef]
Ding, W. , Bonk, A. , Gussone, J. , and Bauer, T. , 2018, “ Electrochemical Measurement of Corrosive Impurities in Molten Chlorides for Thermal Energy Storage,” J. Energy Storage, 15, pp. 408–414. [CrossRef]
Wang, K. , Molina, E. , Dehghani, G. , Xu, B. , Li, P. W. , Hao, Q. , Lucas, P. , Kassaee, M. H. , Jeter, S. M. , and Teja, A. S. , 2014, “ Experimental Investigation to the Properties of Eutectic Salts by NaCl-KCl-ZnCl2 for Application as High Temperature Heat Transfer Fluids,” ASME Paper No. ES2014-6578.
Zhang, Y. , and Li, P. W. , 2017, “ Minimum System Entropy Production as the FOM of High Temperature Heat Transfer Fluids for CSP Systems,” Sol. Energy, 152, pp. 80–90. [CrossRef]
Zhang, Y. , Li, Y. Y. , and Li, P. W. , 2018, “ Evaluation of Several Types of High Temperature Heat Transfer Fluids for Concentrated Solar Power System,” Third Thermal and Fluid Engineering Conference, Fort Lauderdale, FL, Mar. 4–7, Paper No. TFEC-2018-21710.
Vignarooban, K. , Xu, X. H. , Wang, K. , Molina, E. E. , Li, P. W. , Gervasio, D. , and Kannan, A. M. , 2015, “ Vapor Pressure and Corrosivity of Ternary Metal-Chloride Molten-Salt Based Heat Transfer Fluids for Use in Concentrating Solar Power Systems,” Appl. Energy, 159, pp. 206–213. [CrossRef]
Gervasio, D. , Elsentriecy, H. , Phillipi, L. D. S. , Kannan, A. M. , and Xu, X. H. , 2014, “ Materials Challenges for Concentrating Solar Power,” Nanoscale Materials and Devices for Electronics, Photonics and Solar Energy (Nanostructure Science and Technology), S . Goodnick , A . Korkin , R . Nemanich , D . Lockwood , and D . Packer , eds., Springer, New York, Chap. 4. [CrossRef]
ASTM, 2016, “ Standard Test Methods for Tension Testing of Metallic Materials,” ASTM International, West Conshohocken, PA, Standard No. ASTM E8/E8M-16a.

Figures

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Fig. 1

TG signal to indicate the mass loss in measurement

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Fig. 2

An overview of Cp−T curves

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Fig. 3

Detailed Cp−T curves at liquid state

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Fig. 4

Schematics for the vapor pressure test device [21]

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Fig. 5

Vapor pressure variation with temperature

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Fig. 6

Measured viscosity results for MgCl2–KCl eutectic salt

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Fig. 7

Measured data of density for MgCl2–KCl eutectic salt

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Fig. 8

Measured data of thermal diffusivity for MgCl2–KCl eutectic salt

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Fig. 9

Measured thermal conductivity for MgCl2–KCl eutectic salt

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Fig. 10

Geometry and the corresponding dimensions of the specimen of metals for tensile test

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Fig. 11

A metal coupon in molten salt sealed in a vacuumed quartz

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Fig. 12

Tensile strength of coupons after exposure to different environments. The coupon's corrosion test conditions for the curves 1–14 are: 1—fresh coupon with no heating; 2—1 week in air; 3—1 week in Ar; 4—4 weeks in Ar; 5—8 weeks in Ar, 6—1 week in KCl–MgCl2; 7—4 weeks in KCl–MgCl2; 8—8 weeks in KCl–MgCl2; 9—1 week in NaCl–KCl–ZnCl2; 10—4 weeks in NaCl–KCl–ZnCl2; 11—8 weeks in NaCl–KCl–ZnCl2; 12—16 weeks in KCl–MgCl2; 13—16 weeks in NaCl–KCl–ZnCl2; 14—16 weeks in Ar. The temperature of the corrosion tests in Ar gas and molten salts is 800 °C.

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Fig. 13

Tensile strength of coupons after exposure to different environments. The coupon's corrosion test conditions for the curves 1–11 are: 1—fresh coupon with no heating; 2—1 week in Ar gas; 3—4 weeks in Ar gas; 4—1 week in KCl–MgCl2; 5—4 weeks in KCl–MgCl2; 6—1 week in NaCl–KCl–ZnCl2; 7—4 weeks in NaCl–KCl–ZnCl2; 8—8 weeks inKCl–MgCl2; 9—16 weeks in KCl–MgCl2; 10—8 weeks in NaCl–KCl–ZnCl2; 11—16 weeks in NaCl–KCl–ZnCl2. The temperature of the corrosion tests in Ar gas and molten salts is 800 °C.

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