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Skoda, 15 MW Coal Fired Power Plant, 50 Hz, 15000 kW, 11000 V

Description

  1. Overview
    1. 15 MW Skoda new extraction condensing steam turbine generator set with boiler.
    2. Quantity: one set.
  2. Turbine Specifications
    1. Power: 15,000 kW.
    2. RPM: 6,000 / 1,500.
    3. Inlet pressure: 71 kg/cm² g.
    4. Inlet temperature: 500 ± 5 °C.
    5. Bleed pressure: 7-8 kg/cm².
    6. Bleed flow: 4 tph.
    7. Extraction pressure: 1.5 kg/cm² g.
    8. Extraction flow: 444.1 tph.
    9. Exhaust vacuum: 0.08976 kg/cm² g.
    10. Exhaust temperature: 32 °C.
    11. Steam consumption: 3.9 kg/kWh.
    12. Fully condensing mode.
  3. Alternator Specifications
    1. Three-phase synchronous generator.
    2. Type: 0FW-15-4.
    3. Rated frequency: 50 Hz.
    4. Rated capacity: 18.75 MVA.
    5. Rated output: 15,000 kW.
    6. Rated speed: 1,500 rpm.
    7. Rated power factor: 0.8.
    8. Rated stator voltage: 11,000 V.
    9. Rated stator current: 9,844.1 A.
    10. Rated exciting current: 371 A.
    11. Connection: star.
    12. Insulation class: F/F.
    13. Weight: 50,000 kg.
  4. Condenser Specifications
    1. Type: D-21-1300 5.
    2. Heat exchange area: 1,300 sq. meters.
    3. Passes: 2.
    4. Max cooling water pressure: 3.5 kg/cm² g.
    5. Nominal cooling water flow: 3,800 tph.
    6. Nominal cooling water temperature: 32 °C.
    7. Tube material: copper HSN 70-1A.
    8. Tube sheet material: carbon steel.
    9. Shell material: carbon steel.
  5. Scope of Supply – Turbine
    1. Condensing steam turbine with control extraction from inlet flange of main stop valve to coupling of generator and exhaust branch.
    2. Gearbox with coupling and main oil pump.
    3. Main steam stop valve and control valves, hydraulically operated.
    4. Hydraulic actuator for steam turbine control.
    5. Oil station including: main oil tank, lubricating oil coolers (2 x 100%), main oil pump (on low-speed gearbox shaft), auxiliary start-up pump (AC motor driven), emergency oil pump (DC motor driven), oil full-capacity duplex filter, spring-loaded throttling valve for lube oil, and oil piping with valves and pressure gauges (all prefabricated and acid cleaned). Note: oil pipe between oil station and STG excluded.
    6. Turbine gear with electromotor.
    7. Main condenser with connection and spring supports.
    8. Water ejectors.
    9. Condensate pumps.
    10. Drain system piping with trap valves and expanders.
    11. Local instrumentation of turbine for indication and annunciation of high limit conditions.
    12. Turbine control panel with governor Woodward 505E, overspeed protection 203, and turbine supervisors.
    13. Local instrument panel.
    14. Emergency trip and supervisor panel.
    15. Foundation bolts, base plates, and shims.
    16. Special tools and erection jigs, lifting devices for casing and rotor, transport stand for rotor, set of special wrenches for turbine assembly, and checking shaft.
  6. Scope of Supply – Generator
    1. Generator 15 MW, 11,000 V, 1,500 rpm with brushless exciter, 2 x 100% AVR, and CACW cooler.
  7. Scope of Supply – Electric Panels
    1. Generator control panel.
    2. Incomer vacuum circuit panel of 1 kV, 1,600 A.
    3. Relay panel.
    4. Metering-cum-synchronizing panel.
    5. DC motor panel for emergency oil pump.
    6. Battery and battery charger panel, 110 V, 100 Ah.
    7. Lightning arrester, surge capacitor, and potential transformer panel.
    8. Neutral grounding panel.
  8. Exclusions
    1. Civil work of any nature and erection of equipment.
    2. Complete piping and valves outside the above battery limits.
    3. Platforms, ladders, or floor plating.
    4. All power cables/wires required for interconnecting various equipment.
    5. Equipment and system earthing including earthing material.
    6. First fill of lubrication oil.
    7. Steam separators and traps.
    8. Capacitors, cranes, and gantry.
    9. Electrical distribution system.
    10. Bus-bar trucking/cabling between alternator and ACB panel.
    11. Transformers and isolators.
  9. Boiler Overview
    1. Radiant type, natural circulation, spreader stoker continuous ash discharge pulsating grate furnace, bagasse fired boiler with auxiliary equipment, suitable for outdoor installation.
    2. Designed for balanced draft operation and manufactured per IBR/ISO regulations.
    3. Detailed specifications, scope of supply, battery limits, list of exclusions, and technical data sheets as per enclosed annexure.
  10. Boiler Special Features
    1. All bought-out equipment (ID, FD, and SA fans, pumps, motors, auto recirculation valves, variable frequency drives, instrumentation and controls, high pressure valves, safety valves, etc.) from reputed and reliable makes.
    2. Pulsating grate completely shop assembled before dispatch, suitable for outdoor installation.
    3. Proven and sturdy rotary fuel feeders and silo system for continuous fuel feeding into furnace.
    4. Special design drum internals for high steam purity.
    5. Extremely sturdy boiler structure suitable for outdoor installation.
    6. All ductings above ground level.
    7. Reliable instrumentation and control for efficient and smooth boiler operation.
  11. Boiler Technical Specifications
    1. Maximum continuous rating (MCR): 130 tph.
    2. Peak generation for half an hour: 110% of MCR.
    3. Steam pressure at superheater outlet: 71 kg/cm²(g).
    4. Steam temperature at superheater outlet at MCR (between 60% to 100% MCR on bagasse firing): 500 ± 5 °C.
    5. Feed water temperature at deaerator inlet/outlet: 85 °C / 105 °C.
    6. Feed water temperature at economizer inlet: 105 °C.
    7. Excess air % theoretical air: 35%.
    8. Flue gas temperature at airheater outlet at MCR: approximately 150 °C (with bagasse firing).
    9. Type of grate: continuous ash discharge spreader stoker pulsating grate for bagasse.
    10. Type of furnace construction: membrane panel construction.
    11. Type of installation: outdoor.
    12. Main fuel: bagasse having max 50% moisture and GCV of 2,272 kcal/kg.
    13. Thermal efficiency at MCR on GCV of bagasse (50% moisture, 2,272 kcal/kg) per ASME PTC-4.1: 70 +1 -3.
  12. Boiler Drums and Tubes
    1. Boiler provided with minimum one steam drum and water drum, both of fusion welded construction.
    2. Drum provided with suitable dished ends, manhole doors, fitted with cross bars, studs, and nuts at each end.
    3. Steam drum provided with suitable internals to promote circulation and ensure high steam purity.
    4. Heating surface determined with reference to main bank of boiler tubes, front.