Improved superheater material selection

Decreasing corrosion in waste-to-energy plants through improved superheater material selection and a new superheater position - resulting in increased production of heat and power (partly CO2 neutral) combined with environmentally sustainable disposal of waste, KME 709.

Preliminary results of the project
The use of waste as fuel in waste-to-energy, WTE, plants provides an environmentally sustainable disposal of waste combined with a partly CO2 neutral production of heat and power. However, the efficiency of the electricity production on WTE plants is limited by a very corrosive environment in the waste boilers.

In this project two promising methods for decreasing superheater corrosion has been investigated, i.e. a new position for a high temperature superheater to hinder the most corrosive species to deposit on the superheaters, SteamboostTM and the development of new, more resistant materials, which can tolerate higher superheater temperatures in WTE plants.

The Steamboost position environment has been characterised in a commercial plant and conventional superheater materials as well as state of the art stainless steels has been tested. These materials have in addition been compared with the new material class FeCrAl alloys. The investigation of the FeCrAl alloys, both model and commercial alloys, has given insights in the corrosion resistance of different alloying elements in FeCrAl alloys. The results from the Steamboost position are very promising and a full-scale commercial Steamboost installation is scheduled.

Name of PhD students, project participants and project leader of project
Mikkelsen, T. Norman, B. Jönsson, S. Selin, J. Hernblom, J. Eklund, L. Paz, T. Jonsson, J. Liske

Companies that participate in the project
Babcock & Wilcox Vølund A/S, AB Sandvik Materials Technology, Sandvik Heating Technology AB, Göteborg Energi AB