Recent trends and future subjects on high temperature corrosion prevention technologies in high efficiency waste-to-energy plants

Abstract

Corrosion prevention methods of materials are key technologies to increase in power generation efficiency, reduce in environmental pollution and realize maintenance-free in the waste-to-energy plants. Corrosion environment have became severe condition according to social demands such as increase in calolific value of waste, strict pollution regulation etc. For these trends, corrosion prevention technologies such as the improvement of combustion and the optimization of plant design have been applied. Also, the steam condition of more than 673 K/3.9 MPa became majure stream in waste-to-energy boiler by using of highly durable corrosion-resistant coatings such as thermal spray, weld overlay etc. for waterwall, also for superheater tube, the use of 310 type stainless steels and High Cr-High Mo-Ni base alloys has been progressed based on the understanding of corrosion mechanisms. This paper describes the majure development and the application of corrosion prevention and corrosion-resistant material technologies progressed for recent thirty years in waste-to-energy plants, and future subjects for corrosion prevention methods.