Abstract
The improvement in the efficiency of the coal-fired power plants has been mainly achieved by raising steam conditions. Current steam conditions have reached around 600°C and 25MPa, being referred to as ultrasupercritical (USC) steam condition. Based on the broad experience in USC operation, the Japanese engineering group has started development for 700°C class advanced USC (A-USC) technology from 2008, sharing its outcome with those of European, the United States, and other countries’ development projects. This chapter describes the brief review of USC and A-USC technologies, as well as the materials and manufacturing technology for boiler plants. The A-USC development is still an ongoing project, and the contents in this chapter refer to not only technological aspects but also R&D organization as well as the sequence of R&D, which will give valuable information for the possible readers.
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