The effect of increased fractions of waste wood on water wall- and superheater corrosion - Combating corrosion by new materials and improved material selection

Research Project, 2015 – 2018

This project includes two parts; superheater corrosion (SH) and water wall corrosion (WW). The exposures will be performed in the biomass fired boiler at Örtoftaverket. The SH corrosion part will mimic the matrix currently being executed in KME711 (a waste fired boiler), enabling a comparison between the corrosiveness of the different fuels (biomass vs waste) and how the selection of materials can be optimized with respect to fuel quality. In addition, the plan is to stepwise increase the amount of waste wood in the fuel mix at Örtoftaverket, from 30% to 50% with a 10% yearly increase. We will investigate FeCrAl-alloys, state-of-art stainless steels and conventional materials during long term testing at different material temperatures. We will in addition expose probes for the investigation of potential water wall corrosion problems. The stepwise increased fraction of waste wood is of special attention since the risk of Zn and Pb associated corrosion is expected to increase.