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8. Synchronous Generator

Generator last inspection (including visual and borescope inspection, polarization index, insulating resistance test and stator winding resistance) was performed in 2009.

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Home > Used Equipment - 93 MWe natural gas fired Combined Cycle Power Plant for sale                        Heat Recovery Steam Generator 7. Steam Turbine The Steam Turbine is manufactured by General Electric / Nuovo Pignone. Turbine is provided with turning gear and SSS Gears make clutch allowing connection/disconnection between the Turbine itself and the Generator. Steam Turbine Major Inspection was perfo0rmed in 2009.                                         Gas Turbine Case                                         Combustion Chambers                Gas Turbine Speed Reducer Gearbox                        Gas Turbine Inlet Air Filter 6. Heat Recovery Steam Generator Heat Recovery Steam Generator is HENRY VOGT make; installed downstream of the exhaust duct of the Gas Turbine, it receives the hot flue gas from the Gas Turbine itself and produces steam at two different pressure levels. 93 MWe natural gas fired Combined Cycle Power Plant for sale 5. Gas Turbine The following table summarizes Gas turbine’s main figures: 93 MWe natural gas fired Combined Cycle Power Plant   1. Power Plant General Description This is a Combined Cycle Cogeneration Power Plant (CCCPP) located in Boffalora Sopra Ticino (Milan) able to supply about 30 t/h of surplus steam at 80 bar/520°C (50 t/h with post-firing) for any technological application over and above 93 MW of electric power output. It was first synchronized in October 1997 and entered into commercial operation on February 1998; last full load operation was in March, 8th, 2011. As a single-shaft line, it is mainly composed by: one (1) General Electric MS6001FA gas turbine (Frame 6FA) one (1) Heat Recovery Steam Generator (HRSG) producing steam at two different pressure levels (80 and 3 bar) one (1) General Electric condensing steam turbine, with steam extraction one (1) General Electric generator, connected both to gas and steam turbine The step up transformer is provided with three windings since the original design foresees the predisposition to add a second steam turbine with its own generator. We are able to provide all the documentation about the operation and the construction of the power plant. 2. Performances and emissions   The following table summarizes the main figures of the Combined Cycle Cogeneration Power Plant CCPP nominal Gross Output MWe �?93 Gas Turbine nominal power MWe �?70 Steam Turbine nominal power MWe �?23 Surplus Steam at 80 bar / 520°C t/h �?30 Surplus Steam with post-firing t/h �?50 The Power Plant complies with the following emission limits (referred to 15% O2): NOx emissions   mg/Nmc @ 15% O2 50 CO emissions  mg/Nmc @ 15% O2 50 3. Main equipment list The following table summarizes the key data for the main items of the plant with relevant running hours: Equipment  Manufacturer Model Running hours GT  General Electric  MS 6001FA  87.913 ST  Nuovo Pignone  HNK 50/90-3  87.913 Generator  General Electric  7AG  87.913 Gas compressors  Nuovo Pignone  2 x 2HM/1  37.795 / 48.791  HRSG  Henry Vogt  49 87.913 Step-up transformer 11,5-132 kV  ABB  112 MVA + 29 MVA  　/TD> 4. Boffalora Power Plant General Layout Manufacturer  #  General Electric / NP  Model  #  MS6001FA (Frame 6FA)  Serial number  #  296828 1st synchronizing  #  Oct-97 Fuel  #  Natural Gas  Power output @ ISO cond.  MWe  75,9  Heat rate @ ISO cond.  kJ/kWh  9.76 Speed  rpm  5231 Control System  #  GE Speedtronic Mark V  Starting device  #  Generator driven  Air Compressor type  #  Axial, regulating IGV  Compressor stages  #  18 Turbine stages  #  3 Combustion chambers  #  6 NOx reduction system  #  DLN2  Fuel gas pressure  Bar  26÷29  Gearbox Manufacturer  #  Renk Tacke  Gear Speed ratio  rpm  5.500/3.000  Lube oil system  #  Common to Gas and ST  The Gas Turbine was covered by a Long Term Service Agreement (LTSA) with OEM till the end of operation (up to 2012). Several Gas Turbine’s Capital spare parts are available. Major Inspection was performed at 48.000 OH , in 2003; next Major Inspection is planned at 96.000 OH. License  #  Henry Vogt Machine Co. (USA)  Designer  #  MIR (Italy)  Manufacturer  #  COMEF (Italy)  Manufacture Year  #  1997 Type  #  Water tubes, horizontal gas flow, natural circulation  HP section  #  Economizer, Evaporator, Superheater  HP steam pressure  Barg  83 HP steam temperature  °C 523 HP steam flow  t/h  106,7  HP flow with Post-firing  t/h  135 LP section  #  Economizer, Deareator, Evaporator, SH  LP steam pressure  Barg  3 LP steam temperature  °C  191 LP steam flow  t/h  18,6  Post-firing Manufacturer  #  De Jong-Coen  Post-firing Fuel  #  Gas  Steel Stack  m  50 (h)  BMS manufacturer  #  Hartman & Braun  Manufacturer  #  General Electric / Nuovo Pignone  Model  #  HNK 50/90-3  1st synchronizing  #  Oct-97 Power output  Mwe  23,05  Inlet steam pressure HP  Bar  82 Inlet steam temperature HP  °C 515 Inlet steam pressure LP  Bar  2,2  Inlet steam temperature LP  °C 191 Condensing pressure  Bar  0,06  Turbine Speed  rpm  3 Steam Condenser  #  Surface type / Water cooled  Condenser Manufacturer  #  Wellman Graham  Condensing Tubes Material  #  A249 TP 304L

Air insulated bus ducts downstream Generator

9. Fuel Gas Compression Station

Gas Compressors have been overhauled in 2010.

                                         Gas Compression Station

10. Step-Up Transformer

Generator is connected, via an air-insulated bus duct, to a three windings Step-Up transformer, ABB make. Third winding (MV2) is available for a future expansion, to be connected to the generator of a second steam turbine.

Bus duct connection between Generator Circuit Breaker and Main Transformer