Energy & Power
Siemens SST-400 GEO steam turbine for geothermal power plants
By Anthony Capkun
October 26, 2011 – Siemens Energy’s new steam turbine for geothermal power plants—the 60MW-rated SST-400 GEO—combines the casing and turbine-generator package (gearbox, generator and base frame) of the Siemens SST-400 steam turbine with the steam path technologies developed, tested and applied by the steam turbine service provider TurboCare. The GEO can be deployed in power plants operating with superheated direct steam (dry steam) or with saturated steam produced on pressure reduction of the thermal fluid (flash principle). It can also be deployed in the direct or flash steam cycle of combined direct or flash steam/binary systems (flash/binary combined cycle). The SST-400 GEO is suitable for live steam temperatures up to 250ºC, with steam pressures up to 12 bar absolute, and includes resource- and turbine-stage-specific high-grade materials, as well as special features for moisture removal at every stage.