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Steam Turbines, QFQ-50-2-B, 1994, 50 Hz, 50 MW, Coal Fired

Steam Turbines, QFQ-50-2-B, 1994, 50 Hz, 50 MW, Coal Fired

Description

  1. Overview
    1. Output: 62.5 MVA
    2. Stator current: 2440 A
    3. Stator voltage: 10.5 kV
    4. Frequency: 50 Hz
    5. Speed: 3000 rpm
    6. Cooling: hydrogen external cooled
    7. Insulation: class B
  2. Steam Turbine
    1. Model: N50-8.83-1 high pressure
    2. Single cylinder
    3. Condensing type
    4. Rated power: 50 MW
    5. Max power: 55 MW (only under certain condition, not for testing)
    6. Speed: 3000 rpm
    7. Steam inlet pressure: 8.83 MPa
    8. Steam inlet temperature: 535 °C
    9. Low pressure steam exhaust pressure: 0.0054 MPa (at meter 0.1013 - 0.0054 = 0.0959 MPa)
    10. Exhaust temperature at load max: 65 °C
    11. Cooling water temperature: normal 20 °C, max 33 °C
    12. Cooling water flow: 8160 t/h
    13. Water inlet temperature: 220 °C
    14. Total 21 stages (1 adjustable + 20 pressure stages)
    15. At stages 5, 8, 11, 15, 17, 19 set non-adjustable steam extraction
    16. At the 5th stage of the steam turbine bottom there are 2 of Ø168 adjustable heat extraction holes
    17. Pressure: 1.4 MPa to 2.69 MPa, temperature: 337.8 to 400.4 °C
    18. Total steam consumption rate: 193.032 t/h
    19. Steam consumption (guarantee value): 3.72 kg/kWh
    20. Heat rate: 9399 kJ/kWh
    21. Extraction points and specifications:
      1. Back of stage 1: pressure 5.6 MPa, temperature 480 °C
      2. Back of stage 5: pressure 2.691 MPa, temperature 390 °C, extraction capacity 12.28 t/h, re-heater output temperature 220.4 °C, re-heater #2 high add
      3. Back of stage 8: pressure 1.385 MPa, temperature 312 °C, extraction capacity 6.83 t/h, re-heater output temperature 190 °C, re-heater #1 high add
      4. Back of stage 11: pressure 0.772 MPa, temperature 249 °C, extraction capacity 8.21 t/h, re-heater output temperature 158 °C, re-heater de-oxygenator
      5. Back of stage 15: pressure 0.293 MPa, temperature 156 °C, extraction capacity 6.36 t/h, re-heater output temperature 130 °C, re-heater #3 low add
      6. Back of stage 17: pressure 0.131 MPa, temperature 107 °C, extraction capacity 8.85 t/h, re-heater output temperature 105 °C, re-heater #2 low add
      7. Back of stage 19: pressure 0.041 MPa, temperature 76 °C, extraction capacity 6.9 t/h, re-heater output temperature 75 °C, re-heater #1 low add
  3. Boiler
    1. Boiler type: single steam natural convection coal dust boiler, steel structure, reverse U layout
    2. Model: SG-220/9.8-M298
    3. Rated capacity: 220 t/h
    4. Saturated steam pressure: 10.78 MPa
    5. Overheat steam pressure: 9.8 MPa
    6. Steam temperature: 540 °C
    7. Boiler efficiency: 91.1%
    8. Last major overhaul of power plant was in 2004, 2005, and 2007
  4. Condition
    1. Quantity: 3