The Influence of Overlap Degree Research on Nozzle Governing Characteristic


To solve the problems existing in the flow characteristics of steam turbine unit, the influence of valve overlap degree on nozzle governing steam turbine had been studied. The combined flow characteristics of given valve overlap degree were obtained for a 600MW steam turbine unit by the method of theoretical calculation combined with simulation test, and the influence of valve overlap degree on governing stage efficiency and steam chest pressure had been also analyzed. This paper discussed the selection of rational overlap degree and introduced a new method of building model for governing stage efficiency of steam turbine in constant pressure operation condition, which provided theoretical guidance for optimization research on nozzle governing steam turbine operation.

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L. Ma, J. Xu, X. Dong and T. Yang, "The Influence of Overlap Degree Research on Nozzle Governing Characteristic," Energy and Power Engineering, Vol. 5 No. 4B, 2013, pp. 642-645. doi: 10.4236/epe.2013.54B124.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] G. Zimmer and C. H. Florian, “On Linearizing The Steam Mass Flow Relative To The Controller Output,” Proceedings of The ASME 2011 Power Conference, 2011.
[2] Y. Li, L.-K. Lu and S. Liu, “Research on Calculation Method of Governing Stage Off-design Conditions in Consideration of Governing Valve Overlap Degree,” APPEEC, 2010.
[3] Q. J. Li, P. Huo and L. K. Zheng, “Test Method of Rated-sliding Pressure Operation Mode for Domestic 600 MW Steam Turbines,” Turbine technology, 2009, No. 5, pp. 386-389.
[4] Fernández and M. álvarez, “A New Model for the Analysis and Simulation of Steam Turbines at Partial and Full load,” Journal of Engineering for Gas Turbines and Power, 2011.
[5] K. Jonshagen and M. Genrup, “Improved Load Control for a Steam Cycle Combined Heat and Power Plant,” Energy, Vol. 35, 2010, pp. 1694-1700. doi:10.1016/
[6] Y. L. Zhao, Z. F. Qin and X. G. Shi, “Research of 600 MW Steam Turbine Operation Solution of Switching Single-valve to Sequential Valve,” Thermal Turbine, Vol. 36, No. 3, 2007, pp. 71-75.
[7] L. Gao and Y. P. Dai, “Rotor Dynamic Analysis on Partial Admission Control Stage in a Large Power Steam Turbine,” ASME Turbo Expo 2010: Power for Land, Sea and Air, June 14-18, 2010, Glasgow, UK, pp.1-7.

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