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GT11N2 Gas Turbine - Features
Key design features
> Three Combustors
The single, top-mounted, silo combustor allows for easy access from the top of the engine for direct visual inspection of the combustor and hot gas path, as well as the first row of turbine vanes and blades.
- EV (Environmental burner) dry low NOx combustor is suitable for standard natural gas fuels
- LBTU combustor for low calorific value fuels can cope with fuels such as blast furnace gases with a heating value (LHV) of a 2.2 MJ/kg
- Single Burner (SB) combustor is designed for high output peaking with water or steam injection
> Solid welded rotor
This design – using forged discs welded together – used in all Alstom gas and steam turbines, has not had a single weld or disc failure in over 70 years of operation. Since the rotor is welded, it has no through-bolts and no risk of misalignment.
> Compressor
The GT11N2 achieves a high combined cycle part-load efficiency based on the high turndown capability of the 14-stage compressor with three guide vane rows.
> Turbine
The four-stage turbine is made of materials that are easy to recondition. The turbine blade losses are minimised thanks to 3-D designed and air-cooled blades and vanes for the first two stages. Hence the turbine’s high efficiency.
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