Mitsubishi Power, Ltd. (Mitsubishi Power) has been making tireless efforts to improve the efficiency of thermal power generation facility. In order to meet the need for higher efficiency and the demand for smaller size, we have developed a latest steam turbine for the single shaft GTCC that uses a structure with separate high-pressure and intermediate-pressure casings, a side exhaust system and a SSS clutch. For this steam turbine, we adopted high-performance blade design (reaction blades, low-pressure end blades and exhaust diffuser), verification of clearance prediction and control technology, new seal and high-performance bearings, while verifying the performance and reliability at T-point 2 (our power plant demonstration facility). We have also carried out verification of the practical application of 700°C class high-temperature steam turbines, which are the next-generation technology.
This report presents the new technologies adopted in the high-performance steam turbine, features of the new structure, and verification results in the real machine.
