Complete Coal Fired Power Plant, 55 MW, 220 T/H Boiler, 10.5 kV

Description

Steam Boiler
1. Type: coal boiler
2. Rated evaporate capacity: 220 t/h
3. Rated pressure: 9.81 MPa
4. Rated temperature: 540 °C
5. Production year: 2002
6. Operation year: 2003
Steam Turbine
1. Production code: 7# steam turbine
2. Type: N55-8.83-1
3. Rated output: 55 MW
4. Rated speed: 3000 r/min
5. Inlet pressure: 8.83 MPa
6. Inlet temperature: 535 °C
7. Exhaust pressure: 0.0054 MPa
8. Extraction steam pressure: not specified
9. Cooling water temperature: 20 °C
10. Production year: 1994
11. Operating year: 2003
Generator
1. Production code: 7# generator
2. Type: QFQ-50-2-B
3. Rated output: 62500/50000 kVA/kW
4. Rated voltage: 10500 V
5. Rated current: 3440 A
6. Field current: 527 A
7. Power factor: 0.8
8. Rated frequency: 50 Hz
9. Rated speed: 3000 r/min
10. Insulation: B
11. Winding connection: 2-Y
12. Production year: 1994
13. Operation year: 2003
Technical Specifications
1. Steam Turbine
  1. Main parameters: main steam pressure 8.83 MPa (design), 8.83 ± 0.49 MPa (operation); main steam temperature 535 °C (design), 535 ± 5 °C (operation); LP cylinder exhaust pressure 0.0054 MPa (design); condenser cooling water inlet temperature 20 °C (design), < 30 °C (operation)
  2. Vibration condition of the unit (double amplitude vibration value of bearing in µm, from steam turbine or feed-water pump to generator, measuring and recording the ⊥ direction of each axle bush): 55 MW unit – 1# bearing 8, 2# bearing 18, 3# bearing 6, 4# bearing 6; 1# pump – 1# bearing 8, 2# bearing 3, 3# bearing 16, 4# bearing 5; 2# pump – 1# bearing 2, 2# bearing 11, 3# bearing 10, 4# bearing 7
  3. The detailed technical data and summary of the steam turbine unit is available.
  4. The 55 MW unit has operated 39500 hours safely since 2003-2-26.
2. Boiler
  1. All the data for the boiler is available.
  2. The boiler’s output condition: the two boilers have been able to reach the rated output and had over measure since it installed.
  3. Boiler’s operating technical data:
    1. Main parameters: rated evaporation capacity 220 t/h (design and operation); saturated steam pressure 11.28 MPa (design and operation); overheat steam pressure 9.81 °C (design), 9.6 to 9.81 °C (operation); overheat steam temperature 540 °C (design), 535 °C (operation); feed-water temperature 215 °C (design), 210 to 215 °C (operation); smoke exhaust temperature 140 °C (design), 130 to 140 °C (operation); cold air temperature not specified; hot air temperature 380 °C (design), 385 °C (operation); boiler efficiency 90.18% (design), 90.2% (operation); designed coal rank fuel consumption 24.17 t/h; furnace outlet flue gas temperature 1092.6 °C; section of combustion chamber 7570 × 7570 mm; area of refractory belt 69.1 m² (design), 9.1 m² (operation)
    2. Burner: type – regular four corner DC pulverized coal burner; arrangement – four corner; quantity – 4 groups; height from the center to the top – 34390 mm; choke type – not specified; fuel type – 0# light diesel oil; atomization type – not specified; number of the choke – 4; output of single oil gun – 0.637 t/h; atomization type – mechanical atomization
    3. Designing and real coal quality: carbon (CAR) 66.05%; hydrogen (HAR) 2.59%; oxygen (OAR) 2.69%; nitrogen (NAR) 1.05%; sulphur (SAR) 1.47%; moisture (WAR) 8.97%; ash (AAR) 17.18%; low heat value (QAR) 24970 kJ/kg; combustib basis volatile matter (VAR) 10.09%; deformation temperature of ash (T1) > 1400 °C; softening temperature of ash (T2) > 1400 °C; coal fineness (R90) 8 to 10%; erosive index (KKM) 88%
    4. Coal pulverizing system equipment form and system diagram: highest low heat value (QAR) 24662 kJ/kg; lowest low heat value (QAR) 20800 kJ/kg; highest volatile matter (VAAR) not specified

Boiler Rated Pressure	9.81 MPa
Boiler Rated Temperature	540 C
Frequency	50 Hz
Voltage	10,500 V