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Rolls-Royce Aero-Derivative Combustion Turbine Background
2-3
for ease in maintainability. This unit also requires a reduction gearbox in electrical utility
applications.
Several significant upgrades are available for RB211-24C and -24G gas generators which are
generally included in the RB211-24GT:
• DLE “short style” combustor for premix natural gas firing. The new “short style” reduces
acoustic resonance and dynamic pressure pulsations compared with the previous “long style”
DLE burner. The DLE retrofit can achieve less than 25 ppm of NO
x
and CO. There are over
80 units with over 1.5 million hours experience with the DLE combustor (may includes all
DLE styles). The DLE burner generally requires no manual tuning in the field.
• Dual fuel conversion for diffusion flame combustion of natural gas or fuel oil includes the
swirler burner for improved liquid fuel firing, as well as improved gas firing when it contains
condensable liquids
• Gas generator RB211-24G from -24C. Includes replacement of the HP turbine assembly,
including new directionally solidified blades with improved cooling. Either the user can
choose to maximize power and efficiency, or extend creep life of components by up to 50%
by derating the firing temperature 25 F (14 C).
• IP Compressor life improvement. A new stage 7 stator design and new stage 5 and 6
components reduce frettage due to aerodynamic excitation that ultimately could cause stator
breakup and downstream damage.
• Power turbine upgrade of either RT56 or RT62 for use with higher temperatures from the
RB211-24G gas generator. The upgrade generally includes blades, vanes, casings and
diffusers.
RB211 Horsepower Ratings
Engine type Horsepower Designation
-22 26,400 Coberra 264
-24A 29,600 Coberra 6256
-24C 34,000 Coberra 6456 / 6462
-24G 39,600 Coberra 6562
-24G DLE 40,500 Coberra 6762
-24GT 45,000 Coberra 6761