Lübkorr: Accelerated hot‐corrosion through co‐firing of “green fuels” in conventional coal-fired power plants


Bild Forschungsprojekt
Period: 2014-01-01 to 2018-12-31
Funder: Federal Ministry for Economic Affairs and Energy (BMWi)
Project Manager: Dr. Mario Rudolphi, Dr. habil. Xabier Montero
Research Group: High Temperature Materials

Conventional coal-fired power plants are still an important pillar in energy industry to supply the base-load energy when wind and solar power are not sufficiently available. In an effort to reduce consumption of limited fossil fuels, co-firing of biomass has become more and more common. While co-firing reduces the CO2 footprint of the plant, it also introduces higher amounts of corrosive species such as chlorine and sulfur into the system. Consequently, higher corrosion rates and material loss are observed in the firing chamber components. Especially superheater tubes are subjected to increased corrosive attack and are prone to early replacement.

Several materials are selected for exposure experiments in order to clarify the role of sulfur- and chlorine-containing salts on the hot corrosion attack. The investigated materials cover a broad range of commercially available alloys, from nickel-based to iron-based materials. Testing is performed with the specimens embedded in artificial ash and in fire-side simulating atmosphere containing SO2 and HCl.

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