Control valves and cascades for the first stages of turbines with ultrasupercritical steam parameters
- Authors: Zaryankin A.E.1, Rogalev N.D.1, Rogalev A.N.1, Garanin I.V.1, Osipov S.K.1, Grigoriev E.Y.1
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Affiliations:
- Moscow Power Engineering Institute, (MPEI, National Research University)
- Issue: Vol 63, No 6 (2016)
- Pages: 422-429
- Section: Steam-Turbine, Gas-Turbine, and Combined-Cycle Plants and Their Auxiliary Equipment
- URL: https://journals.rcsi.science/0040-6015/article/view/172305
- DOI: https://doi.org/10.1134/S0040601516060094
- ID: 172305
Cite item
Abstract
This paper considers the problems that will unavoidably be encountered in the creation of new-generation turbines operated at ultrasupercritical initial steam parameters, namely, the development of new control and shutoff valves, the reduction of end energy losses in blade cascades and steam leaks in high-pressure cylinders (HPCs), the elimination of effect produced by regenerative steam bleedoffs on the afterextraction stage, the cooling of a blade cascade, etc. Some possible solutions are given for the two first of the listed problems. The conclusion about the need for the transition to new-generation control valves in the development of new advanced steam turbines with ultrasupercritical initial steam parameters has been made. From the viewpoint of their design, the considered new-generation valves differ from the known contemporary constructions by a shaped axially symmetric confusor channel and perforated zones on the streamlined spool surface and the inlet diffuser saddle part. The analysis of the vibration behavior of new-generation valves has demonstrated a decrease in the dynamic loads acting on their stems. To reduce the end energy losses in nozzle or blade cascades with small aspect ratios, it is proposed to use finned shrouds in the interblade channels. The cross section of fins has a triangular profile, and their height must be comparable with the thickness of the boundary layer in the outlet cross section of a cascade and, provisionally, be smaller than 8% of the cascade chord.
Keywords
About the authors
A. E. Zaryankin
Moscow Power Engineering Institute, (MPEI, National Research University)
Email: osipovsk@mail.ru
Russian Federation, ul. Krasnokazarmennaya 14, Moscow, 111250
N. D. Rogalev
Moscow Power Engineering Institute, (MPEI, National Research University)
Email: osipovsk@mail.ru
Russian Federation, ul. Krasnokazarmennaya 14, Moscow, 111250
A. N. Rogalev
Moscow Power Engineering Institute, (MPEI, National Research University)
Email: osipovsk@mail.ru
Russian Federation, ul. Krasnokazarmennaya 14, Moscow, 111250
I. V. Garanin
Moscow Power Engineering Institute, (MPEI, National Research University)
Email: osipovsk@mail.ru
Russian Federation, ul. Krasnokazarmennaya 14, Moscow, 111250
S. K. Osipov
Moscow Power Engineering Institute, (MPEI, National Research University)
Author for correspondence.
Email: osipovsk@mail.ru
Russian Federation, ul. Krasnokazarmennaya 14, Moscow, 111250
E. Yu. Grigoriev
Moscow Power Engineering Institute, (MPEI, National Research University)
Email: osipovsk@mail.ru
Russian Federation, ul. Krasnokazarmennaya 14, Moscow, 111250