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