Abstract
Impurities may affect structural alloy compatibility in both indirect- and direct-fired supercritical CO2 (sCO2) cycles for high efficiency power generation with peak temperatures above 700°C. Using a new multi-pump gas control system, experiments with controlled impurity additions were compared to baseline results in research- or industrial-grade CO2 at 750°C/300 bar. Low level impurities, 50 ppm O2 and 50 ppm H2O, were not found to affect mass change or reaction products after 2,500 h exposures. However, in RG sCO2+1%O2+ 0.25%H2O, higher reaction rates were observed for both Ni- and Fe-based alloys, but especially Fe-based alloys were strongly affected by these high impurity levels. Analytical TEM was used to characterize the reaction products on alloy 625.
| Original language | English |
|---|---|
| Pages (from-to) | 238-244 |
| Number of pages | 7 |
| Journal | Conference Proceedings of the European sCO2 Conference |
| DOIs | |
| State | Published - 2019 |
| Event | 3rd European Conference on Supercritical CO2 Power Systems, sCO2 2019 - Paris, France Duration: Sep 19 2019 → Sep 20 2019 |
Funding
The authors would like to thank M. Howell, M. Stephens, T. M. Lowe, R. G. Brese and T. Jordan for assistance with the experimental work. Material was provided by Haynes International, Special Metals, Sandvik and Capstone Turbine, Corp. S. S. Raiman and R. Pillai provided helpful comments on the manuscript. This research was sponsored by the U.S. Department of Energy, Office of Fossil Energy, Crosscutting Technology Program and the Office of Energy Efficiency and Renewable Energy, Solar Energy Technology Program: SuNLaMP award number DE-EE0001556.
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