Vol.1, No 8, 2001 pp. 1083 - 1090
UDC 621.16
ESTIMATED CONSUMPTION OF WORKING
LIFE OF HIGH PRESSURE STEAM TURBINE ROTOR IN STATIONARY WORK
Dejan Mitrović, Dragoljub Živković
Faculty of Mechanical Engineering, University of Niš, FR Yugoslavia
Abstract. Strategy of Yugoslavia energetic development forecasts
the increase of electrical energy production covering its future consumption.
In order to satisfy that consumption it's necessary to build new capacities
(plants) or/and to prolong working life of existing capacities by revitalisation.
Because of large prices of building new capacities (1200 $/kW), the aim
is to prolong working life for, at least, 15 years. Costs of revitalisation
of thermoenergetic plants are 20% of unit costs of building new one.
Getting reliable estimation about spent of work life components is
one of the demands that follows quality repair preparation.
The methodology, for estimated consumption of working life of steam
turbine rotor, has been introduced. There have been taken into account
creep, due to stationary thermal stresses, centrifugal forces and steam
pressure. For estimated consumption of working life, Palmgren-Miner hypothesis
based on the theory of linear damage accumulation, has been used.
The procedure is applied to the high-pressure turbine rotor (MAN-339
MW) in the power plant "Kosovo-B", unit 1, in Obilić.
PROCENA UTROŠENOG RADNOG VEKA ROTORA TURBINE
VISOKOG PRITISKA PRI STACIONARNOM RADU
Strategija razvoja energetike Jugoslavije, predviđa porast proizvodnje
električne energije radi zadovoljenja njene buduće potražnje. Za zadovoljenje
te potražnje nužno je da se izgrade novi kapaciteti ili/i da se postojećim
kapacitetima produžI radni vek njihovom revitalizacijom. Zbog visoke cene
gradnje novih kapaciteta (1200 $/kW) težnja je da se revitalizacijom postojećih
produži njihovo korišćenje za bar 15 godina. Troškovi revitalizacije termoelektrana
su 20% jediničnih troškova novih.
Dobijanje pouzdanih procena o utrošenom radnom veku komponente, jedan
je od zahteva koji prate kvalitetnu pripremu remonta.
U radu je prikazana metoda za proračun utrošenog radnog veka rotora
turbine visokog pritiska. U obzir je uzeto puzanje, kao posledica stacionarnih
termičkih napona, centrifugalnih sila i pritiska pare. Za procenu utrošenog
radnog veka korišćena je Palmgren-Minerova hipoteza zasnovana na teoriji
o linearnoj akumulaciji oštećenja.
Navedena procedura primenjena je na rotoru turbine visokog pritiska
(MAN-339 MW) u termoelektrani "Kosovo-B", blok 1, u Obiliću.
