Abstract
For the next generation of concentrating solar power (CSP) plants, K-Mg-Na chloride salts are being explored as a potential higher temperature thermal storage medium. However, there are concerns about compatibility of structural alloys with the salt. To move beyond simple static pot compatibility experiments while a pumped salt loop is being constructed, thermal convection loops were constructed from ∼16wt.%Cr Ni-based alloy 600 and operated for 100-1000?h with peak temperatures of 700° and 750°C. These experiments indicated that alloy 600 was compatible up to 700°C with purified (i.e. low O2-) or dried (low H2O) industrial-sourced Mg-K-Na chloride salt with <10?μm/yr loss. Mass transfer was observed from the hot leg to the cold leg in each experiment and more surface deposits were observed with the dried salt. Post-exposure room temperature tensile tests showed minimal degradation of alloy 600 under these conditions.
| Original language | English |
|---|---|
| Title of host publication | SolarPACES 2020 - 26th International Conference on Concentrating Solar Power and Chemical Energy Systems |
| Editors | Christoph Richter, Avi Shultz |
| Publisher | American Institute of Physics Inc. |
| ISBN (Electronic) | 9780735441958 |
| DOIs | |
| State | Published - May 12 2022 |
| Event | 26th International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2020 - Freiburg, Virtual, Germany Duration: Sep 28 2020 → Oct 2 2020 |
Publication series
| Name | AIP Conference Proceedings |
|---|---|
| Volume | 2445 |
| ISSN (Print) | 0094-243X |
| ISSN (Electronic) | 1551-7616 |
Conference
| Conference | 26th International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2020 |
|---|---|
| Country/Territory | Germany |
| City | Freiburg, Virtual |
| Period | 09/28/20 → 10/2/20 |
Funding
The authors would like to thank A. Willoughby, M. Stephens, T. Lowe, T. Jordan, V. Cox, M. Lance and R. Mayes at ORNL for assistance with the experimental work and J. R. Keiser and R. Pillai for comments on the manuscript. This research was funded by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy, Solar Energy Technology Program: CSP award number 33873. The input of L. Irwin as the technical project monitor is appreciated. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).