DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492 Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy 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 (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.
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DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
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 (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.
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
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
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
4. Boffalora Power Plant General Layout
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
5. Gas Turbine
The following table summarizes Gas turbine’s main figures:
Manufacturer # General Electric / NP
Model # MS6001FA (Frame 6FA)
Serial number # 296828
1st synchronizing # October 1997
Fuel # Natural Gas
Power output @ ISO cond. MWe 75,9
Heat rate @ ISO cond. kJ/kWh 9.760
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.
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
Gas Turbine Case
Combustion Chambers
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
Gas Turbine Speed Reducer Gearbox
Gas Turbine Inlet Air Filter
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
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.
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
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
Heat Recovery Steam Generator
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
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.
Manufacturer # General Electric /
Nuovo Pignone
Model # HNK 50/90-3
1st synchronizing # October 1997
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 3.000
Steam Condenser # Surface type /
Water cooled
Condenser Manufacturer # Wellman Graham
Condensing Tubes Material # A249 TP 304L
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
Turbine Discharge Case Local Instrument Panel
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
Water cooled Steam Condenser
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
8. Synchronous Generator
Generator last inspection (including visual and borescope inspection, polarization index, insulating
resistance test and stator winding resistance) was performed in 2009.
Manufacturer # General Electric
Model # 7AG
Power output MVA 110
Power Factor Cos-fi 0.85
Cooling System # Air to Water Cooled
Speed Rpm 3.000 (2-pole)
Frequency Hz 50
Rated Voltage V 11.500
Rated Current A 5.522
Insulation Class # F
Excitation type # Static
Excitation Model # EX2.000 – General El
Generator Starter # Static type
Static Starter Model # Directo-Matic 2.000
General Electric
Air insulated bus ducts downstream Generator
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
9. Fuel Gas Compression Station
Gas Compressors have been overhauled in 2010.
Compressors Manufacturer # Nuovo Pignone
Number of Units # 2 (1 duty, 1 stand-by)
Model # 2HM/1
Type # Reciprocating
Rated Flow Rate Nmc/h 22.750
Design Press. (inlet/outlet) Bar g 16 / 29
Design Temp. (inlet/outlet) °C 20 / 65
Speed Rpm 740
Mechanical Power kW 500
Regulation Steps % 0-50-75-100
Electric Motor Manufact. # ABB
Motor Voltage V 6.300, 3-phase
Motor Cooling System # Water
Motor Lube System # Upgraded to oil free
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
Gas Compression Station
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
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.
Transformer Make # ABB
Manufacture Year # 1996
Number of Units # 1
Manufacture Year # 1997
Installation # Outdoor
Windings # 3-phase (1 primary HV; 2 secondary MV)
Frequency Hz 50
Voltage level (HV) kV 139.8 +/- 8x1.25%
Voltage levels (MV1-MV2) kV 11.5
Rated Power (HV/MV1/MV2) MVA 141.5 / 112 / 29.5
Rated Current (HV/MV1/MV2) A 584,4 / 5.623 / 1.481
Connection groups # YN-d11-d11
Cooling Type # Onaf
DdG Equipment di Renzo MEYER - P. I.V.A.: 03687600985 - Nr. REA: BS 554492
Via Scavi Romani, 3- 25105 - Desenzano del Garda - (Brescia) – Italy
Bus duct connection between Generator Circuit Breaker and Main Transformer