Coatings for Gas Turbine Components
Journal of Thermal Spray Technology
Hoboken
Evaluation tests of 1700 °C class turbine cooled blades for a hydrogen
fueled combustion turbine system. The development of 1700 °C class hy-drogen-fueled combustion turbine system with output of 500 MW and thermal efficiency of more than 60% (HHV) has been conducted in the World Energy
Network (WE-NET) program. This paper describes the development of the first-stage turbine cooled stator and rotor blades applied to the power-generation system. The conceptual design of these cooling blades, which w ere
served in hot steam flow, was carried out. The hybrid cooling method combin -ing recovery cooling with partial ejection cooling was chosen from several cooling systems from a viewpoint of plant efficiency, operational reliab ility, and durability of cooled blades. Also, the single-crystal (SC) superalloy as a blade substrate and thermal barrier coating (TBC) were applied. The experiment sof the scale model turbine cooled blades were carried out using a hydrogen-oxygen combustion wind tunnel with practical steam conditions of 1700 °C and 2.5 MPa. The cooling effectiveness and metal temperature at rated condition and the soundness of TBC and blade substrate of the first-stage stator and rotor test blades were clarified.
Keywords: combustion, cooling, durability, hydrogen fuels, reliability, substrates, turbines, turbomachine blades
T. Okamura, H. Kawagishi, A. Koga, and S. Itoh, Department of Energy En-gineering, Hachinohe Institute of Technology, Hachinohe 031-8501, Japan.
Cited: Heat Transf. Asian Res., 32 (3), May 2003 pp. 237-252 [in English].
ISSN 1099-2871.
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