The Siemens SST-700 is a dual-casing, geared, high-pressure steam turbine. Designed and produced by Siemens, it is employed for alternating current generation at gas/biomass combined cycle and solar-thermal power plants. It is composed of a geared high pressure (HP) turbine module and a low pressure (LP) turbine module. They both drive an AC generator set up in between
Although each module of the Siemens SST-700 can be combined for optimal configuration, they can also be used independently. This steam turbine also has other applications, such as mechanical drives, heat recovery, and waste incineration plants. This axial-flow machine, together with the generator, can deliver 175 MW.
Technical data (specifications)
Length: 22 m (73 ft)
Width: 15 m (59 ft)
Height: 6 m (20 ft)
Power output: up to 175 MW
Rotational speed: 3,000 – 13,200 rpm
Inlet pressure (with reheat): up to 165 bar/165 psi
Inlet temperature (with reheat): up to 585 degrees Celcius/1085 degrees F.
Exhaust (back) pressure: up to 40 bar (580 psi)
Condensing exhaust pressure: up to 0.6 bar (8.5 psi)
Controlled extraction: up to 40 bar, and up to 415 degrees Celcius/780 degrees F.
Below, the rotor of the SST-700 turbine.
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