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Siemens, SST-400, steam turbine, 2012, 30 MW

Description

  1. Overview
    1. Condition: brand new, unused, including all accessories
    2. Availability: in stock
  2. Machine Type And Configuration
    1. Machine type: SST-400, single-cylinder, horizontally split casing, reaction type, pure condensing, axial exhaust steam turbine
    2. Drive arrangement: high-speed steam turbine plus parallel-shaft reduction gearbox driving a mains-frequency generator
    3. Applicable grid: 50 Hz (domestic China) and 60 Hz (overseas)
    4. Power coverage: 5 to 65 MW pure condensing, shipped as a skid-mounted modular package, assembled by Siemens at Huludao
  3. Rated Output
    1. Generator terminal rated output: 30.49 MW (pure condensing THA condition)
    2. Maximum continuous output VWO: 32.0 MW (valves wide open)
  4. Inlet Steam Parameters
    1. Pressure before main stop valve: 12.7 MPa(a) (design limit 14 MPa)
    2. Temperature before main stop valve: 535 C (original manufacturer maximum 540 C)
    3. THA steam flow: 113.0 t/h
  5. Exhaust And Condensing Side
    1. Rated condensing back pressure: 6.8 kPa(a) (conventional 6.8 kPa)
    2. Exhaust flow area: 1.3 square metres (axial exhaust as standard)
  6. Speed System
    1. Turbine rated speed: 5500 r/min (high-speed reaction type)
    2. Generator speed: 1500 r/min (50 Hz mains frequency)
    3. Overspeed trip speed: 6050 r/min (1.1 times rated speed)
  7. Thermal Performance
    1. Heat rate at THA condition: 8920 kJ/kWh (including the regenerative system)
    2. Turbine internal efficiency: 87.5 per cent (three-dimensional reaction-stage blading)
    3. Number of regenerative stages: 5 (2 high-pressure heaters, deaerator, 2 low-pressure heaters)
  8. Shafting And Transmission
    1. Reduction gearbox efficiency: 98.5 per cent (parallel single-stage reduction)
    2. Bearing type: tilting-pad journal bearings plus thrust bearing, fed by an independent oil station
  9. Skid Overall Dimensions
    1. Overall length: 18 m (59.1 ft) (shipped on a one-piece skid base)
    2. Overall width: 8.5 m (27.9 ft)
    3. Overall height: 5.5 m (18.0 ft)
  10. Operating Boundaries
    1. Stable load range: 20 to 105 per cent of rated (capable of deep peak-shaving)
    2. Cold start to synchronising: 18 to 22 minutes (flexible starting and stopping)
  11. Electrical Package
    1. Generator rated capacity: 35870 kVA (power factor 0.85)
    2. Generator terminal voltage: 10.5 kV (13.8 kV commonly used in combined cycle)
  12. Steam System Design Boundaries
    1. Live steam: up to 140 bar(a) and 540 C
    2. Reheat condition: reheat pressure not above 30 bar(a), reheat temperature not above 450 C
    3. Extraction arrangement: up to 2 controlled extractions (not above 45 bar(a), 450 C); multiple uncontrolled extractions (not above 60 bar(a))
    4. Condensing back-pressure limit: 0.3 kPa(a); conventional project selection 0.06 to 0.08 bar