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Impact of increased power plant cycling on the oxidation and corrosion of coal-fired superheater materials

  • As power generation from variable renewable energy sources such as wind and solar power continues to increase in the future, fewer baseload power plants will be needed. As a result, high operational flexibility is becoming a vital requirement for conventional power plants to allow for the smooth integration of the variable renewable energy sources (v-RES) into the grid. To understand the impact of high operational flexibility (increased cycling) for coal-fired power plant materials, five commercial coal boiler superheater and reheater materials were investigated under isothermal and cyclic conditions for 1000 h each. The candidate alloys investigated were: T91, VM12-SHC, TP347-HFG, DMV304 HCu and DMV310 N. The results (weight change kinetics and metallographic analysis) after exposure at a metal surface temperature of 650 °C clearly showed the impact of increased flexibility on the corrosion and oxidation of the materials. Oxide growth (weight gain), metal loss, oxide spallation, and grain boundary attack were found to be more severeAs power generation from variable renewable energy sources such as wind and solar power continues to increase in the future, fewer baseload power plants will be needed. As a result, high operational flexibility is becoming a vital requirement for conventional power plants to allow for the smooth integration of the variable renewable energy sources (v-RES) into the grid. To understand the impact of high operational flexibility (increased cycling) for coal-fired power plant materials, five commercial coal boiler superheater and reheater materials were investigated under isothermal and cyclic conditions for 1000 h each. The candidate alloys investigated were: T91, VM12-SHC, TP347-HFG, DMV304 HCu and DMV310 N. The results (weight change kinetics and metallographic analysis) after exposure at a metal surface temperature of 650 °C clearly showed the impact of increased flexibility on the corrosion and oxidation of the materials. Oxide growth (weight gain), metal loss, oxide spallation, and grain boundary attack were found to be more severe under cyclic conditions than under isothermal conditions.zeige mehrzeige weniger

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Metadaten
Verfasserangaben:Abang, Roger Atini, Weiß, SabineORCiDGND, Krautz, Hans JoachimGND
DOI:https://doi.org/10.1016/j.fuel.2018.02.047
ISSN:0016-2361
Titel der Quelle (Englisch):Fuel
Dokumentart:Wissenschaftlicher Zeitschriftenartikel referiert
Sprache:Englisch
Erscheinungsjahr:2018
Freies Schlagwort / Tag:Power plant flexibility, Isothermal oxidation, Cyclic oxidation, High temperature corrosion, Superheaters
Band / Jahrgang:2018
Ausgabe / Heft:220
Erste Seite:521
Letzte Seite:534
Fakultät / Fachgebiet:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Kraftwerkstechnik
Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Metallkunde und Werkstofftechnik