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Siemens, SST 400, 2011, Condensing Steam Turbine, 30 MW, 50/60Hz

Siemens, SST 400, 2011, Condensing Steam Turbine, 30 MW, 50/60Hz

Description

  1. Overview
    1. Siemens SST 400 condensing steam turbine with four bleeds and one extraction
    2. Year 2011
    3. Direction of rotation: c.w. (seen in the direction of steam flow)
  2. Output Ratings
    1. Turbine output (at generator terminals): normal 30 MW, maximal 31.88 MW, minimal 4.5 MW
    2. Continuous rated output at generator terminal end at condenser pressure of 0.101 bar(a): 30,750 kW
    3. Power factor: cos 0.85
  3. Speeds
    1. Rated turbine speed: 5,038 rpm
    2. Rated generator speed: 1,500 rpm
    3. Emergency trip (turbine): 110% at 5,542 rpm
    4. Resonance (turbine): 1st natural frequency 2,620 rpm, 2nd natural frequency 6,398 rpm
    5. Torsional critical (complete train): 18.0 Hz, 61.3 Hz, 152.7 Hz
  4. Live Steam Conditions
    1. Pressure rated: 127 bar(g), max. 133.4 bar(g)
    2. Temperature rated: 535 °C, max. 543 °C
    3. Temperature jump, max. permissible: ±20 °
    4. Subsequent rate of temperature change: ±2 °C/min
    5. Rate of temperature change, max. permissible (without previous temperature jump): ±5 °C/min
    6. Steam flow max.: 128.6 t/h
    7. Short time deviations acc. to IEC 45-1 (see also section 6): pressure increase max. 12 h/a 152.6 bar(g), temperature increase max. 400 h/a 549 °C, steam quality
  5. Bleed and Extraction Data
    1. 4th bleed: pressure 33.377 bar(g), steam flow 7.67 t/h
    2. 3rd bleed: pressure 17.856 bar(g), steam flow 5.71 t/h
    3. Extraction: pressure 9.0 bar(g), steam flow 7.60 t/h
    4. 2nd bleed: pressure 2.811 bar(g), steam flow 8.16 t/h
    5. 1st bleed: pressure -0.104/0.896 bar(g)/bar(a), steam flow 8.64 t/h
  6. Exhaust Conditions
    1. Pressure rated: -0.932/0.068 bar(g)/bar(a)
    2. Steam temperature: 38 °C
    3. Steam flow: 82 t/h
  7. Load Points and Guarantee Load Point
    1. Load points: no extraction, 70 t/h extraction
    2. Output at generator terminals: 17,990 to 31,230 kW
    3. Turbine operating speed: 5,000 rpm
    4. Power factor: cos 0.85
    5. Live steam: inlet pressure 128 bar(a), inlet temperature 535 °C, inlet flow 119.77 t/h
    6. 1st bleed: pressure 0.115 to 0.896 bar(a), flow 2.31 to 8.64 t/h
    7. 2nd bleed: pressure 0.525 to 3.811 bar(a), flow 4.71 to 8.16 t/h
    8. Extraction: pressure 10 bar(a), flow 7.60 to 87.3 t/h
    9. 3rd bleed: pressure 18.848 to 18.856 bar(a), flow 5.71 t/h
    10. 4th bleed: pressure 34.345 to 34.377 bar(a), flow 7.66 to 7.67 t/h
    11. Outlet: pressure 0.041 to 0.068 bar(a), flow 11.70 to 81.65 t/h
  8. Protection and Safety Equipment
    1. Safety system complies with IEC 61508/511 standards for functional safety
    2. Selected safety instrumented functions (SIF) comply with relevant safety integrity level (SIL) category
    3. Protection circuits with SIL ≥1 must be tested before first commissioning and documented in test report; tests must be performed at maximum intervals of 3 years and recorded
    4. Before first commissioning and after longer standstill, all protection and safety devices should be tested and actual response values recorded in a special report
    5. All safety devices, interlocks, protections, and open loops work via system TURLOOP S7
  9. List of Safety Instrumented Functions
    1. Turbine exhaust steam pressure: SIL 2, MAA10 CP002, MAA10 CP003, MAA10 CP004
    2. Turbine extraction steam pressure: SIL 2, LBG10 CP001, LBG10 CP002, LBG10 CP003
    3. Condensate level in condenser: SIL 2, MAG10 CL101, MAG10 CL102, MAG10 CL103
    4. Turbine emergency trip push button – local panel: SIL 2, MAA10 CH101
    5. Turbine emergency trip push button – control room: SIL 2, MAA10 CH102
    6. Turbine emergency trip push button – TCC: SIL 2, MAA10 CH103
    7. External emergency trip – DCS demand: SIL 3 ready, MAA10 CH104, MAA10 CH105, MAA10 CH106
    8. Turbine speed: SIL 3, MAD10 CS001, MAD10 CS002, MAD10 CS003
  10. Protection Equipment (Emergency Tripping)
    1. Extraction steam pressure: normal 9 bar(g), response >12.2 bar(g), items LBG10 CP001, LBG10 CP002, LBG10 CP003, LBG10 CP901
    2. Exhaust steam pressure: normal -0.932 bar(g), response >-0.75 bar(g), items MAA10 CP002, MAA10 CP003, MAA10 CP004
    3. Turbine emergency trip push button – local panel: binary, item MAA10 CH101
    4. Turbine emergency trip push button – control room: binary, item MAA10 CH102
    5. Turbine emergency trip push button – TCC: binary, item MAA10 CH103
    6. External turbine trip – DCS demand: binary, items MAA10 CH104, MAA10 CH105, MAA10 CH106
    7. Turbine rotor axial displacement: normal ±0.1 mm, response >0.6 mm (MAD10 CG001) or <-0.6 mm (MAD10 CG002)
    8. Turbine speed: normal 5,038 rpm, response >5,542 rpm, items MAD10 CS001, MAD10 CS002, MAD10 CS003
    9. Axial turbine bearing metal temperature – front/rear part: normal °C, response >120 °C, items MAD10 CT001, MAD10 CT002
    10. Front radial turbine bearing metal temperature: normal °C, response >120 °C, item MAD10 CT003
    11. Rear radial turbine bearing metal temperature: normal °C, response >120 °C, item MAD20 CT001
    12. Relative shaft vibration (2A) – turbine front radial bearing: normal µm, response >127 µm, items MAD10 CY011, MAD10 CY012
    13. Relative shaft vibration (2A) – turbine rear radial bearing: normal µm, response >127 µm, items MAD20 CY011, MAD20 CY012
    14. Condensate level in condenser: binary, items MAG10 CL101, MAG10 CL102, MAG10 CL103
    15. Gear box radial bearing temperature: normal °C, response >130 °C, items MAK10 CT001, MAK10 CT002, MAK10 CT003, MAK10 CT004
    16. Gear box axial bearing temperature: normal °C, response >130 °C, items MAK10 CT005, MAK10 CT006
    17. Relative shaft vibration – gear box (2A) – pinion bearing: normal µm, response >103 µm, items MAK10 CY011, MAK10 CY012
    18. Relative shaft vibration – gear box (2A) – wheel bearing: normal µm, response >137 µm, items MAK10 CY013, MAK10 CY014
    19. Lube oil pressure: normal 2 bar(g), response <1 bar(g), items MAV40 CP001, MAV40 CP002, MAV40 CP003
    20. Lube oil temperature: normal 49 °C, response >65 °C, items MAV40 CT001, MAV40 CT002, MAV40 CT003
    21. Valve block position 2 from 3 (valve 1,2,3): normal 140 bar(g), response <90 bar(g), items MAX40 CP001, MAX40 CP002, MAX40 CP003
    22. Generator protection action (summary pulse): binary, item MKA10 CE101
    23. Generator front/rear radial bearing temperature: normal °C, response >95 °C, items MKD10 CT001, MKD20 CT001
    24. Shaft vibration generator front radial bearing: normal µm, response >190 µm, items MKD10 CY011, MKD10 CY012
    25. Shaft vibration generator rear radial bearing: normal µm, response >190 µm, items MKD20 CY011, MKD20 CY012
  11. Safety Devices – Alarm Signal
    1. Live steam pressure to turbine: normal 127 bar(g), response >133.4 bar(g) or <120.6 bar(g), item LBA10 CP001
    2. Live steam temperature to turbine: normal 535 °C, response >549 °C or >543 °C or <527 °C, item LBA10 CT001
    3. Extraction steam pressure: normal 9 bar(g), response >11.1 bar(g) or <7.1 bar(g), items LBG10 CP001, LBG10 CP002, LBG10 CP003, LBG10 CP901
    4. Steam pressure behind control stage: normal bar(g), response >65.6 bar(g), item MAA10 CP001
    5. Exhaust steam pressure: normal bar(g), response >-0.8 bar(g), items MAA10 CP002, MAA10 CP003, MAA10 CP004, MAA10 CP901
    6. Exhaust steam temperature: normal °C, response >120 °C, items MAA10 CT001, MAA10 CT002, MAA10 CT003, MAA10 CT903
    7. Turbine casing temperature difference – inside/center: normal °C, response >102 °C, item MAA10 CT901
    8. Turbine casing temperature difference – top/bottom: normal °C, response >39 °C, item MAA10 CT902
    9. Turbine rotor axial displacement: normal ±0.1 mm, response >0.4 mm or <-0.4 mm, items MAD10 CG001, MAD10 CG002
    10. Turbine speed: normal 5,038 rpm, response <300 rpm or <4 rpm, items MAD10 CS001, MAD10 CS002, MAD10 CS003, MAD10 CS901
    11. Turbine axial bearing metal temperature: normal max. 95 °C, response >110 °C, items MAD10 CT001, MAD10 CT002
    12. Turbine front radial bearing metal temperature: normal max. 90 °C, response >110 °C, item MAD10 CT003
    13. Relative shaft vibration (2A) – turbine front radial bearing: normal µm, response >127 µm, items MAD10 CY011, MAD10 CY012