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A High-efficiency Steam Turbine Utilizing Optimized Reaction Blades |
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—An Application to the Kwangyang Combined-cycle Power Plant of K-Power of Republic of Korea— |
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AUTHORS |
| Hidetoshi Fujii |
Steam Turbine Design Sec., Turbine Plant Design Dept., Hitachi Works, Power Systems, Hitachi, Ltd. |
| Tetsuaki Kimura |
Steam Turbine Design Sec., Turbine Plant Design Dept., Hitachi Works, Power Systems, Hitachi, Ltd. |
| Kiyoshi Segawa |
Steam Turbine Gr., Steam Turbine Project, Power & Industrial Systems R&D Lab., Power Systems, Hitachi, Ltd. |
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OVERVIEW |
In recent years, since reduction of carbon-dioxide emissions is drawing major attention, new thermal power plants—the main body of which are destined for overseas markets—demand improved thermal efficiency even in the case of steam turbines. At the same time, in regard to rotor blades (which have relatively small blade length), the role of aerodynamic loss in the secondary flow regions and in the boundary layers along the blade length becomes significant; therefore, Hitachi developed an optimized reaction blade based on a new design concept that takes such steam flow characteristics into account. Applied in the high-pressure-turbine sections of two steam turbines for combined-cycle power generators hitherto used for 50-Hz generation, these blades significantly improve the efficiency of the high-pressure turbines. The optimized reaction blades were installed in the high-pressure turbines of the Kwangyang Combined-cycle Power Plant (steam-turbine output power: 200 MW) of K-Power of Republic of Korea. It was confirmed by performance testing on actual turbines that in this first application to 60-Hz turbines, these blades significantly improve turbine efficiency in a similar manner to the 50-Hz applications so far practically implemented.
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RELEVANT SITE |
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KEYWORDS |
steam turbine, combined cycle, blade, thermal power plant, efficiency
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