Development of Super Environment-Resistant Steels for High-Temperature and High-Efficiency Waste-to Power Plant Schemed for the Minimized Environmental Risks

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Waste treatment technology is crossing today at the turning point for attaining both much more reasonable society system of resource cycling and more sophisticated energy utilization and/or recovery through such as improving an efficiency of waste-to-power generation. It is strongly required for such a waste power plant system innovation to introduce commercially the highly corrosion-resistant alloy materials as a superheater for high-temperature boiler, since such an environment is highly aggressive to cause very sever high-temperature corrosive damage associated with both the molten salt deposited onto the superheater tube surface and flue gas containing high concentration of also aggressive chloride compounds.In the present research work has been made in order to promote the commercial introduction the low cost and highly corrosion-resistant superheater tube materials based on the steel, on the bases of the corrosive failure analysis and alloy design, by using the newly developed high-temperature corrosion testing apparatus termed as "temperature variable high-temperature corrosion testing apparatus" which enable to control intensively the temperature gradient and/or difference between surround gas atmosphere and steel metal.On the basis of the results obtained, the effect of principal alloying element on the corrosion resistance was clarified mainly by means of he multiple regression analysis, and an alloy design concept was established for improving the corrosion performance particularly from the viewpoint of developing effectively the protective oxide scale layers. Furthermore, the technological subjects to be solved in near future were also pointed out.