Development of a lifetime model for superheater tubes with combustion of refined biomass fuels in power plants, industrial furnaces (co-combustion), and local applications (biomass combustion)

18370 N

Bild Forschungsprojekt
Period: 2016-06-01 to 2018-11-30
Partner: Institute of Combustion and Power Plant Technology (IFK)
Funder: Federal Ministry for Economics and Technology (BMWI, Germany) via AiF
Project Manager: Tobias Meißner
Research Group: High Temperature Materials

In the course of energy transition the use of existing power plants for co-firing of biomass has become more and more substantial in terms of base load supply. However, 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. Thus, co-firing is commonly limited to temperatures below 500°C and small biomass-to-coal ratios (10%).

This project is a collaboration between DECHEMA Research Institute (DFI) and the Institute of Combustion and Power Plant Technology (IFK). Supported by different industrial partners it aims at developing a lifetime model for selected steels used as superheater tube material. IFK focuses on the characterization of the biomass and its ash arising from co-firing in the institute’s 500 kW pulverised fuel combustion rig. The main emphasis at DFI is on the evaluation of protective diffusion coatings applied via the slurry route (Al, Cr, Si) in order to protect the metal surfaces against high temperature corrosion. These coatings are very promising as they are cost-effective and may be applied on-site as well. Furthermore, testing at DFI is performed in fire-side-simulating atmosphere containing SO2 and HCl and with the specimens embedded in ash originating from biomass (co-)firing at IFK. Finally, experimental results will be combined with thermodynamic calculations in order to develop a lifetime model and to maximize service life of superheater tubes. Eventually an increasing demand for biofuels can be achieved and, subsequently, local biomass refiners might benefit from the development of new business areas.

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Das IGF-Vorhaben Nr. 18370 N der Forschungsvereinigung DECHEMA e.V., Theodor-Heuss-Allee 25, 60486 Frankfurt am Main wurde über die AiF im Rahmen des Programms zur Förderung der industriellen Gemeinschaftsforschung (IGF) vom Bundesministerium für Wirtschaft und Energie aufgrund eines Beschlusses des Deutschen Bundestages gefördert.

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