Naslov
NON-STATIONARY TEMPERATURE STRESSES IN THE INDUSTRIAL STEAM TURBINE ROTOR

Autori
Guzović, Zvonimir ; Kovačić, Krešimir ; Mihalić, Tihomir

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of The 16th International Research/Expert Conference ”Trends in the Development of Machinery and Associated Technology” - TMT 2012 / Ekinović, Sabahudin ; et al. - Zenica : Mašinski fakultet Univerziteta u Zenici, 2012, 587-590

Skup
The 16th International Research/Expert Conference ”Trends in the Development of Machinery and Associated Technology” - TMT 2012

Mjesto i datum
Dubai, Ujedinjeni Arapski Emirati, 10.09.2012. - 12.09.2012

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Industrial steam turbine; Transient regimes; Temperature stresses; Numerical modelling

Sažetak
The usage of industrial steam turbines in different industrial branches (chemistry, petrochemistry, refineries, sugar and ethanol plants, etc.) for a generator drive for electricity generation or a mechanical drive for compressors, blowers and pumps, is characterized by the need for high flexibility of operation. High flexibility includes numerous start-ups, shut-downs and power changes during the useful life. Changes in power and steam mass flow lead to changes of the working fluid state in the single turbine stages, and thus their aerodynamic and thermodynamic characteristics. During these transient working regimes in steam turbine rotors, large space and time-dependent temperature gradients appear, which can result in high non-stationary temperature stresses, i.e. increased local stress concentrations, what has a negative impact on the useful life of the rotor. In the worst case they can cause fracture of the turbine rotor. Today, for the determination of thermal stressed state of the steam turbine parts the user softwares based on numerical methods are used. In this paper the results of numerical modelling and calculations of non-stationary temperature fields and related stresses in the rotor of industrial steam turbine of 35 MW power during transient operating regime (a cold startup)will be presented. The results of the calculations serve for estimation of the transient regime impact on the stresses of the rotor, as well as on its entire useful life.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA