TY - JOUR
T1 - EFFECT OF IMPURITIES ON SUPERCRITICAL CO2 COMPATIBILITY
AU - Pint, Bruce A.
AU - Unocic, Kinga A.
AU - Keiser, James R.
N1 - Publisher Copyright:
© 2019 Conference Proceedings of the European sCO2 Conference.
PY - 2019
Y1 - 2019
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=85101979050&partnerID=8YFLogxK
U2 - 10.17185/duepublico/48899
DO - 10.17185/duepublico/48899
M3 - Conference article
AN - SCOPUS:85101979050
SN - 2510-7852
SP - 238
EP - 244
JO - Conference Proceedings of the European sCO2 Conference
JF - Conference Proceedings of the European sCO2 Conference
T2 - 3rd European Conference on Supercritical CO2 Power Systems, sCO2 2019
Y2 - 19 September 2019 through 20 September 2019
ER -