PT Unknown
AU Pint, B
   Unocic, KA
   Keiser, J
AU 3rd European supercritical CO2 Conference September 19-20, 2019, Paris, France
TI Effect of impurities on supercritical CO2 compatibility
SE 3rd European Conference on Supercritical CO2 (sCO2) Power Systems 2019: 19th-20th September 2019
PD 10
PY 2019
BP 238
EP 244
DI 10.17185/duepublico/48899
LA en
AB 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.
ER