THERMAL AND THERMAL STRESS STATE OF THE HIGH-PRESSURE ROTOR OF THE K-325-23.5 TURBINE AT COLD STATE START-UP

Authors

Yu. O. Bakhmutskaya, A. Podgorny Institute of Mechanical Engineering Problems of NASU (2/10, Pozharsky St., Kharkiv, 61046, Ukraine), e-mail: julia.bakhmutska@gmail.com, ORCID: 0000-0002-2334-7432

V. N. Goloshchapov, A. Podgorny Institute of Mechanical Engineering Problems of NASU (2/10, Pozharsky St., Kharkiv, 61046, Ukraine)

Abstract

A computational study of the thermal and thermally stressed states of the high-pressure cylinder rotor of the PJSC Turboatom 325 MW steam turbine at warm-up and cold state start-up stages was performed. In order to determine the non-stationary thermal state of the rotor, thermal boundary conditions of the 3rd kind were obtained. The process of vapor condensation on the surfaces of the rotor elements and the interbody space was taken into account. A change in the design and conditions of high-pressure rotor heating in the area of the front end seal at the stage of preparation for cold state start-up is proposed. A possibility of reducing the level of thermal stresses arising during turbine start-up is shown.

Keywords: steam turbine, high-pressure rotor, boundary conditions, thermal state, thermal stresses

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Received 21 February 2017

Published 30 June 2017