Page 116 - Steam Turbines Design, Applications, and Rerating

Rotors for Reaction Turbines 97

Figure 5.3 Bladed solid rotor of an 11.5-MW steam turbine.
(Asea Brown-Boveri, Baden, Switzerland)

Finite-element calculations allow the complete start-up procedure to
be established and enable accurate predictions to be made about the
temperature and stress conditions occurring at any time between the
start-up and stationary condition.
Figure 5.6 shows the finite-element mesh of the high-temperature
section of the solid rotor for a 45-MW condensing turbine. This mesh

Figure 5.4 Section through the solid rotor of a 15-MW
industrial steam turbine. (Asea Brown-Boveri, Baden,
Switzerland)

Figure 5.5 Relationship between
stresses set up in a solid rotor,
using diameter vs. start-up rate
criteria (T, rotor temperature;
t, time interval). (Asea Brown-
Boveri, Baden, Switzerland)