Yuichi Hirakawa

Development of Advanced USC Technologies for 700°C Class High Temperature Steam Turbines

Global warming due to increased CO2 levels in the atmosphere and resource saving have been the focus of world attention in the past decades. Efforts to improve generating efficiency by increasing the turbine inlet steam temperature and pressure in large capacity fossil-fuel and combined-cycle power plants are being made together with efforts to improve the internal efficiency. Most of MHI’s modern steam turbines, including the combined cycle plants, have a 600°C class USC inlet steam conditions. 700°C class Advanced USC (A-USC) technology is one of the remarkable technologies being developed to reduce CO2 emissions, and one, which was chosen by Japan’s ‘Cool Earth - Innovative Energy Technology Program’, which was launched in 2008 to contribute to substantial reductions in CO2 emissions. Major Japanese manufacturers of boilers and turbines joined forces with research institutes to bring the project to reality. This paper illustrates the features and benefits of A-USC technologies for MHI’s 700°C class high temperature steam turbines, including cycle design, conceptual design (structure and alloy), and the development of candidate materials.Copyright

Development and Verification of Ultra-Long-Blade for Next Generation Steam Turbine

Mitsubishi Heavy Industries, Ltd. (MHI) has developed “LP-End Blades Series” by employing the ISB (I ntegral S hroud B lade) structure and has lead high efficiency and reliability of the steam turbine. The latest technology has been integrated into Ultra-Long-Blades design for the next generation’s steam turbine. This paper describes the design summary of 3600rpm-50inch/3000rpm-60inches and 1800/1500rpm-74/62inches Blades and results of the verification tests.Copyright