Page 354 - Steam Turbines Design, Applications, and Rerating
P. 354
328 Chapter Fifteen
If all staging is of the Rateau type in this portion of the turbine:
V j = 215/0.46 = 467 m/s
ΔH i per stage is therefore:
2 2
Vj 467
ΔH i = = = 109.0 kJ/kg
2000 2000
The number of Rateau stages in this section would therefore be:
Total energy available 832
= = 7.7 (say 8)
Energy removed per stage 109.0
The turbine will, therefore, contain one 635-mm diameter Curtis
stage followed by eight 890-mm-diameter Rateau stages with the
extraction opening after the Curtis stage.