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Mitsubishi Hitachi Power Systems America – Energy and Environment, Ltd.

The steam turbine technology for combined cycle applications is characterized by standardized, high quality and cost competitive STG sets that are specifically designed to address the needs of the North American combined cycle market, including, but not limited to:

  • 1x1, 2x1, 3x1 combined cycle applications.
  • F-Class, G-Class, H/J-Class combustion turbine applications.
  • Applications with large amounts of HRSG duct firing.
  • Applications with 100% turbine bypass systems.
  • Wet surface condensers or air cooled condenser applications.
  • Applications with frequent start-ups and load cycling.
  • Small footprint.

Mitsubishi Hitachi Power Systems America – Energy and Environment, Ltd. steam turbine for combined cycle applications follow a modular approach that ensures high quality and cost competitive designs.

Standard Steam Turbine Generator Features for Combined Cycle Applications

Performance Range*:

  • Output Range:  150-450 MW
  • Normal Back-pressure: 1.5 – 3.2 in Hga
  • Throttle Pressure: up to 2,400 psia
  • Throttle Temperature: 1050 ºF
  • Hot Reheat Steam Temperature: 1050 ºF

* deviations from the performance range stated above are possible.

Steam Turbine Features:

  • Tandem compound, condensing turbines.
  • Stiff rotor design made of a single solid forging.
  • Double casing design with symmetric steam inlets.
  • Combined high pressure and intermediate pressure casing with opposing flow HP and IP turbines.
  • Low pressure turbine casing(s) with single or double flow exhaust.
  • Last stage blade lengths up to 45 inches.

Generator Features

  • Totally Enclosed, self-ventilated, forced lubricated.
  • Cylindrical rotor.
  • Synchronous alternator.
  • Air cooled or Hydrogen cooled*.
  • Static exciter.

* For large generator capacities a hydrogen/water cooled generator may be used.

Turbine and Generator Auxiliaries

  • Combined Lube Oil and Seal Oil System comprised of the following skids:
    - Lube Oil Tank Skid,
    - Lube Oil Purifier Skid,
    - Lube Oil Filter Skid,
    - Lube Oil Cooler Skid(s);
    - Generator Shaft Seal Oil Skid;
    - Jacking Oil Pump Skid (not required for all applications.)
  • Electro Hydraulic Power Skid.
  • Generator Hydrogen Control Skid (not required for all applications.)
  • Gland Steam Condenser.