Complicated Corrosion Problems and Prevention of Metallic Materials for Hot Section Components in Advanced Waste Treatment Plants at Elevated Temperatures

Abstract
Technological aspects concerning waste treatment are at present at a significant turning point from several viewpoints, being closely related with changes in the rules and management system for waste together with a demand for protection against the environmental risk species such as dioxins, etc. In the present paper, some phases of technical approaches will be demonstrated for establishing a more reasonable waste treatment system to enable highly increased thermal recovery through efficiency improvement of waste-to-power generation by developing a high-temperature boiler. Furthermore, state-of-art development of waste to gasification (pyrolizing) and ash combustion melting systems as a more sophisticated system for the next generation by which high grade of both the material and thermal recovery becomes possible will be presented along with technical subjects to be solved in the near future. It should be emphasized that materials innovation is one of the key-technologies for realizing such an advanced waste treatment system.

Key words: high-efficiency waste-to-power genaration, high-temperature high-pressure boiler, high-temperature corrosion, corrosion-resistant alloys, oxy-chlorination reaction