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Title: Study of Material Compatibility for a Thermal Energy Storage System with Phase Change Material

Abstract

The suitability of stainless steel 316L and Inconel 625 for use in a latent heat thermal energy storage (TES) system was investigated. A NaCl–NaF eutectic mixture with a melting temperature of 680 °C was used as the phase change material (PCM). Containers were filled with the PCM prior to heating to 750 °C, then examined after 100 and 2500 h of high-temperature exposure by analyzing the material surface and cross-section areas. A small amount of corrosion was present in both samples after 100 h. Neither sample suffered significant damage after 2500 h. The undesirable inter-granular grain boundary attack found in SS316L samples was in the order of 1–2 µm in depth. On Inconel 625 sample surface, an oxide complex formed, resisting material dissolution into the PCM. The surface morphology of tested samples remained largely unchanged after 2500 h, but the corrosion pattern changed from an initially localized corrosion penetration to a more uniform type. After 2500 h, the corrosion depth of Inconel 625 remained at roughly 1–2 µm, indicating that the corrosion rate decelerated. Both materials demonstrated good compatibility with the chosen NaF–NaCl eutectic salt, but the low corrosion activity in Inconel 625 samples shows a performance advantage for longmore » term operation.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]
  1. West Virginia Univ., Morgantown, WV (United States)
  2. Bechtel National Incorporation, Richland, WA (United States)
Publication Date:
Research Org.:
Infinia Corp., Kennewick, WA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1509867
Grant/Contract Number:  
FC36-08GO18157
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Energies (Basel)
Additional Journal Information:
Journal Volume: 11; Journal Issue: 3; Journal ID: ISSN 1996-1073
Publisher:
MDPI AG
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; thermal energy storage (TES); phase change material (PCM); concentrating solar power (CSP); molten salt; material compatibility; corrosion rate

Citation Formats

Qiu, Songgang, Solomon, Laura, and Fang, Ming. Study of Material Compatibility for a Thermal Energy Storage System with Phase Change Material. United States: N. p., 2018. Web. doi:10.3390/en11030572.
Qiu, Songgang, Solomon, Laura, & Fang, Ming. Study of Material Compatibility for a Thermal Energy Storage System with Phase Change Material. United States. doi:10.3390/en11030572.
Qiu, Songgang, Solomon, Laura, and Fang, Ming. Tue . "Study of Material Compatibility for a Thermal Energy Storage System with Phase Change Material". United States. doi:10.3390/en11030572. https://www.osti.gov/servlets/purl/1509867.
@article{osti_1509867,
title = {Study of Material Compatibility for a Thermal Energy Storage System with Phase Change Material},
author = {Qiu, Songgang and Solomon, Laura and Fang, Ming},
abstractNote = {The suitability of stainless steel 316L and Inconel 625 for use in a latent heat thermal energy storage (TES) system was investigated. A NaCl–NaF eutectic mixture with a melting temperature of 680 °C was used as the phase change material (PCM). Containers were filled with the PCM prior to heating to 750 °C, then examined after 100 and 2500 h of high-temperature exposure by analyzing the material surface and cross-section areas. A small amount of corrosion was present in both samples after 100 h. Neither sample suffered significant damage after 2500 h. The undesirable inter-granular grain boundary attack found in SS316L samples was in the order of 1–2 µm in depth. On Inconel 625 sample surface, an oxide complex formed, resisting material dissolution into the PCM. The surface morphology of tested samples remained largely unchanged after 2500 h, but the corrosion pattern changed from an initially localized corrosion penetration to a more uniform type. After 2500 h, the corrosion depth of Inconel 625 remained at roughly 1–2 µm, indicating that the corrosion rate decelerated. Both materials demonstrated good compatibility with the chosen NaF–NaCl eutectic salt, but the low corrosion activity in Inconel 625 samples shows a performance advantage for long term operation.},
doi = {10.3390/en11030572},
journal = {Energies (Basel)},
issn = {1996-1073},
number = 3,
volume = 11,
place = {United States},
year = {2018},
month = {3}
}

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Works referenced in this record:

Macroencapsulation and characterization of phase change materials for latent heat thermal energy storage systems
journal, September 2015


State of the art on high temperature thermal energy storage for power generation. Part 1�Concepts, materials and modellization
journal, January 2010

  • Gil, Antoni; Medrano, Marc; Martorell, Ingrid
  • Renewable and Sustainable Energy Reviews, Vol. 14, Issue 1, p. 31-55
  • DOI: 10.1016/j.rser.2009.07.035