Based on the rapid development of ultra-supercritical coal-fired units in China, by using material upshift and innovative structural design, such as double barrel cylinder, to improve the steam turbine high pressure and high temperature capability, by using the thermodynamic system optimization and high efficient flow technology to further improve the economy of steam turbine, DongFang has successfully developed a new generation of steam turbine, the parameters reach 35MPa / 615°C/ 630°C/630°C, heat consumption is lower than 6800 kJ/kWh, the generating efficiency of power plant exceeds 50%. This paper also introduces some technical development of future high-efficiency steam turbines at 650°C and 700°C.

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