Abstract:

The most practical， feasible， economic， effective methods for CO2 emission reduction in power plant are to improve the efficiency of power plants as far as possible and develop ultra-supercritical coal-fired thermal power technology. The key to realize 700 ℃ ultra-supercritical technology is the development of high-temperature metallic materials with long-term safe operation in 700 ℃ steam. And these materials must have the characteristics: （1） creep rupture strength at high temperature； （2） being resistant to high-temperature corrosion of flue gas； （3） antioxidation of steam side and oxide layer spalling； （4） good behavior of thermal fatigue resistance. This paper introduced the EU AD700 and COMTES700 programs and the latest development of high-temperature metallic materials in 700 ℃ ultra-supercritical technology in America and Japan， including material test， high temperature metallic materials test in furnace and demonstration program. In addition， bottlenecks， constraints， as well as solutions of high-temperature metallic materials used in 700 ℃ ultra-supercritical units were discussed.

Key words: 700 ℃ ultra-supercritical technology, high-temperature metallic materials, CO2 emission reduction