TS-46 Development of Hydrogen-Oxygen Combustion Turbine Cooling Blades in WE-NET Project(Session C-1 Heat Transfer 1)

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The development of 1700℃ class hydrogen fueled combustion turbine system with output of 500MW and thermal efficiency of over 60% (HHV) has been launched in World Energy Network (WE NET) program in Japan. This paper describes the development of the first stage turbine cooling blade applied to this power generation system. The conceptual design of those cooling blades which were served in hot steam flow was carried out: The hybrid cooling method combining closed circuit cooling passage with a partially open circuit one was chosen between several cooling systems from a point of plant efficiency and durability of cooling blades. Also the single crystal super alloy as a blade substrate and thermal barrier coating (TBC) were applied. The several elemental tests such as outer heat transfer on cascade blade, internal heat transfer in cooling channel and then evaluation of single crystal super alloy and TBCs in hot steam environment were conducted. Finally the experiments of scale model blades for the first stage stator and rotor blades were carried out using hydrogen-oxygen combustion wind tunnel with practical steam conditions of 1700℃ and 2.5MPa. The cooling efficiency and metal temperature distribution of test blades and the soundness of TBC and blade substrate were clarified.
公益社団法人日本ガスタービン学会の論文
1999-11-14