Abstract
The global energy market has grown steadily as various energy technologies have been developed. Renewable energy has been used widely but conventional power plants are still used as major electric power sources, including steam turbines and gas turbines. Recently, flexible power plant operation in terms of load management has become important in the power generation industry. For flexible operation, overload valve operation has been introduced for ultra-supercritical steam turbine plants. Overload valve operation is an operation wherein some of the steam at the control valve is bypassed into the middle of the high pressure turbine. In this study, an in-house program is developed for the analysis of ultra-supercritical steam turbines using overload valve operation. A full off-design analysis is performed based on theoretical and empirical correlations. Four kinds of operations were comparatively investigated; control valve operation, sliding pressure operation, and two types of overload valve operation. The influence of the overload valve is analyzed in terms of operating characteristics and performance.
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Recommended by Editor Yong Tae Kang
S. Y. Kang received his M.S. degree from Dept. of Mechanical Engineering, Inha University in 2010, and is now a Doctoral student in the same department. His major research topic is performance analysis of energy and power generation systems.
J. J. Lee received his B.S. degree from the Department of Mechanical Engineering, Inha University, in 2015 and is currently a master's degree student in the same department. His major research topic is performance evaluation and CFD simulation of steam turbines.
T. S. Kim received his Ph.D. degree from Dept. of Mechanical Engineering, Seoul National University in 1995. He has been with Dept. of Mechanical Engineering, Inha University since 2000. His research interests are design and analysis of advanced energy systems including gas/steam turbine based power plants.
S. J. Park joined Doosan Heavy Industries, Limited, Ltd. in 1995 after receiving his Bachelor and Master’s degrees in Mechanical Engineering from Pusan University. He engaged in aerodynamic design and performance evaluation of Turbine/Generator performance team for the past seven years.
G. W. Hong graduated from the Department of Mechanical Engineering, Korea University, in 1997 and is currently a research member of Turbine R&D Center in Doosan Heavy Industries. His working topic is thermo-aerodynamic design and CFD simulation of steam turbines.
J. H. Ahn graduated from the Department of Mechanical Engineering, Yeungnam University, in 2006 and is currently a Thermodynamic Engineer of Turbine/Generator performance team in Doosan Heavy Industries. His working topic is thermodynamic design and performance evaluation of steam turbines.
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Kang, S.Y., Lee, J.J., Kim, T.S. et al. Program development for performance analysis of a steam turbine system with the use of overload valve. J Mech Sci Technol 30, 5759–5769 (2016). https://doi.org/10.1007/s12206-016-1146-x
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DOI: https://doi.org/10.1007/s12206-016-1146-x