Research and evaluation of T91 superheater material for high temperature corrosion in biomass power plants

Abstract

Purpose – The purpose of this paper was to evaluate corrosion resistance of superheater T91 material based on high temperature corrosion experiments with a condensate environment. Design/methodology/approach – The contributions of water temperature, chloride concentration and corrosion time were considered and analyzed for modeling corrosion kinetics. The corrosion tendency also was predicted, and the results were compared with higher temperature exposures of T91 tube material installed in a biomass power plant. Findings – High temperature exposure tests showed that the corrosion rates of T91 material would increase with temperature; there was a very evident corrosion acceleration point in 110°C. It was concluded that dimensional homogeneity analysis can serve as a viable evaluation method for T91 superheater material. Originality/value – Dimensional homogeneity analysis was used as evaluation method for anti-corrosion performance of T91 superheater material.