DEVELOPMENT AND APPLICATION OF HIGH-TEMPERATURE CORROSION-RESISTANT MATERIALS AND COATINGS FOR ADVANCED WASTE-TO-ENERGY PLANTS

Recently, the high-efficient thermal recycle technology of waste has b ecome an important subject all over the world. In order to complete a highly-efficient waste burning boiler that produces the steam level of 500 degrees C/100ata, the development and application of corrosion-re sistant materials for use in a severely corrosive environment are key- technology, combining with corrosion prevention methods on designing a nd engineering of plants. The characteristics of high-temperature corr osion factors and corrosion behavior in waterwall and superheater tube s of waste-to-energy boiler are described first in this report. Then, the current development and application of corrosion-resistant boiler tubings and high-temperature coatings used for this kind of severe cor rosive condition are summarized. Many kinds of alloys containing effec tive elements for corrosion tubings, and also applied by the coating p rocesses of weld overlay and metal spraying. Furthermore, investigatio ns of corrosion mechanism and laboratory evalutation methods which hav e a good reproducibility of an actual boiler are strongly needed to de velop new materials.