SST-800: A single-casing
direct-drive steam
turbine ideally suited
for combined-cycle
E-LNG power plants.
Power generation - Steam turbines
Outperforming conventional simple-cycle schemes with a
40 percent improvement in thermal efficiency and reducing
greenhouse-gas emissions by about 30 percent, Siemens
combined-cycle power plants allow taking full advantage
of the economic benefits offered by the E-LNG concept.
Steam turbines distinguished by superior overall efficiency
and proven suitability for industrial applications are
employed.
High-pressure steam produced in the heat recovery steam
generator (HRSG) attached to each gas turbine is fed to a
skid-mounted Siemens condensing steam turbine SST-800
directly driving a two-pole synchronous generator. Extraction
turbines are used if process steam is also required, e.g.
for boiling the amine fluid of the gas-processing plant.
Exhaust steam flows axially or radially into shell-tube type
condensers with either water or air-cooling, typically
installed indoors behind the turbine, or outdoors close to
the turbine hall.
Excellence in industrial service
The SST-800 single-casing center-admission steam turbine
has an impulse control stage, and reaction blades inside
removable blade carriers in the power section. Even though
it is maintenance free for the 5+ years operating regimes
in LNG liquefaction plants, the SST-800’s horizontally-split
casing allows for easy access to the rotor and the blade
carriers. Simplifying installation and minimizing commissioning
time, the turbine is of a standardized, modular
design. It can be optimally matched to the thermo-dynamic
data of the HRSG with live steam pressures of up to 140
bar and temperatures of up to 540 °C. Based on a century
of experience within Siemens, more than 50 steam turbines
of this design are successfully operating worldwide.
Power Generation
