Critical corrosion phenomena in combustion of biomass and waste

Project leader: Jesper Liske (Chalmers)

Participating companies:

  • Elforsk
  • Sandvik Materials Technology
  • Sandvik Heating Technology
  • Valmet
  • Foster Wheeler
  • Völund
  • Andritz
  • Castolin
  • Sakab

About the project

The goal of the project is to generate new fundamental knowledge on critical corrosion phenomena in fireside environments that are applicable to practical corrosion issues in the plants. The work is primarily directed towards corrosion of the steam superheaters but also deals with the corrosion of colder parts of the boiler, e.g. water walls and economizer. The new knowledge should give guidance regarding what measures that may be taken to make the fireside environment less corrosive and regarding the choice of more resistant materials and coatings. The project should also provide input for optimizing the choice of materials in the superheaters.

The research-related efforts in this project also aim to contribute with fundamental knowledge to HTC, so that HTC can verify that the steam temperature can be increased by 50°C still using conventional superheater materials. This means an increase from approximately 530-580°C with “clean” biofuels and about 450-500°C with waste fractions (RDF). Such an increase of steam data would greatly improve the competitiveness of this source for sustainable electricity production. In order to solve the corrosion problems two strategies apply; you can either try to mitigate the corrosivity of the fireside environment or you can make use of more corrosion-resistant materials. In any case, a solid knowledge of the details of the corrosion process is necessary to address the corrosion issues.

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