It MONCALIERI PLANT GT

2nd GT of the Cogeneration Plant 2013 october

Functional diagram

Steam generator with three pressure levels pressure (bar) capacity (Kg/s) temperature (°C) • AP 94 76,4 542 G • MP 28 87,9 542 3~ • BP 4,6 9,7 225 www.irenenergia.it MONCALIERI PLANT 2ND GT Gas turbine • Capacity 270 MW Steam turbine • Fuel natural gas • Capacity 141 MW

AP MP BP G 3~ Iren Energia is the company in the Iren Group whose core The plant is made up of two combined-cycle cogeneration businesses are the production and distribution of electri- units (2nd GT and 3rd GT), with an overall electrical capacity city, the production and distribution of thermal energy for of 800 MW and a thermal capacity of 520 MW in cogene - district heating and the provision of technological services. ration mode, and a supplementary and back-up plant with a capacity of 141 MW. water-cooled condenser Iren Energia constantly pursues its objectives, which are qua- canal lity, reliability, sustainable development, energy efficiency The heat produced by the cogenerators provides district and a close relationship with the areas in which it operates. heating for a total volume of 55 million cubic metres, The 2nd GT is part of the Moncalieri cogeneration plant, which, making Turin the city with the largest district heating sy - Heat exchangers for district together with the Torino Nord plant, supplies Turin’s district stem in Italy. heating • Thermal power 260 MW heating network. • Inlet temperature 70°C • Outlet temperature 120°C district heating

TEST DATA Combined-cycle operation Combined-cycle and cogeneration operation ISO conditions on site ISO conditions on site

• Net electrical power 395 MW • Net electrical power 340 MW • Efficiency 58% • Thermal power 260 MW • Efficiency 90%

Iren Energia S.p.A. Corso Svizzera, 95 10143 Torino - Italy Tel. +39 011 5549 111 Fax +39 011 53 83 13 2nd GT of the Cogeneration Plant 2013 october

Functional diagram

Steam generator with three pressure levels pressure (bar) capacity (Kg/s) temperature (°C) • AP 94 76,4 542 G • MP 28 87,9 542 3~ • BP 4,6 9,7 225 www.irenenergia.it MONCALIERI PLANT 2ND GT Gas turbine • Capacity 270 MW Steam turbine • Fuel natural gas • Capacity 141 MW

AP MP BP G 3~ Iren Energia is the company in the Iren Group whose core The plant is made up of two combined-cycle cogeneration businesses are the production and distribution of electri- units (2nd GT and 3rd GT), with an overall electrical capacity city, the production and distribution of thermal energy for of 800 MW and a thermal capacity of 520 MW in cogene - district heating and the provision of technological services. ration mode, and a supplementary and back-up plant with a capacity of 141 MW. water-cooled condenser Iren Energia constantly pursues its objectives, which are qua- canal lity, reliability, sustainable development, energy efficiency The heat produced by the cogenerators provides district and a close relationship with the areas in which it operates. heating for a total volume of 55 million cubic metres, The 2nd GT is part of the Moncalieri cogeneration plant, which, making Turin the city with the largest district heating sy - Heat exchangers for district together with the Torino Nord plant, supplies Turin’s district stem in Italy. heating • Thermal power 260 MW heating network. • Inlet temperature 70°C • Outlet temperature 120°C district heating

TEST DATA Combined-cycle operation Combined-cycle and cogeneration operation ISO conditions on site ISO conditions on site

• Net electrical power 395 MW • Net electrical power 340 MW • Efficiency 58% • Thermal power 260 MW • Efficiency 90%

Iren Energia S.p.A. Corso Svizzera, 95 10143 Torino - Italy Tel. +39 011 5549 111 Fax +39 011 53 83 13 2nd GT of the Cogeneration Plant 2013 october

Functional diagram

Steam generator with three pressure levels pressure (bar) capacity (Kg/s) temperature (°C) • AP 94 76,4 542 G • MP 28 87,9 542 3~ • BP 4,6 9,7 225 www.irenenergia.it MONCALIERI PLANT 2ND GT Gas turbine • Capacity 270 MW Steam turbine • Fuel natural gas • Capacity 141 MW

AP MP BP G 3~ Iren Energia is the company in the Iren Group whose core The plant is made up of two combined-cycle cogeneration businesses are the production and distribution of electri- units (2nd GT and 3rd GT), with an overall electrical capacity city, the production and distribution of thermal energy for of 800 MW and a thermal capacity of 520 MW in cogene - district heating and the provision of technological services. ration mode, and a supplementary and back-up plant with a capacity of 141 MW. water-cooled condenser Iren Energia constantly pursues its objectives, which are qua- canal lity, reliability, sustainable development, energy efficiency The heat produced by the cogenerators provides district and a close relationship with the areas in which it operates. heating for a total volume of 55 million cubic metres, The 2nd GT is part of the Moncalieri cogeneration plant, which, making Turin the city with the largest district heating sy - Heat exchangers for district together with the Torino Nord plant, supplies Turin’s district stem in Italy. heating • Thermal power 260 MW heating network. • Inlet temperature 70°C • Outlet temperature 120°C district heating

TEST DATA Combined-cycle operation Combined-cycle and cogeneration operation ISO conditions on site ISO conditions on site

• Net electrical power 395 MW • Net electrical power 340 MW • Efficiency 58% • Thermal power 260 MW • Efficiency 90%

Iren Energia S.p.A. Corso Svizzera, 95 10143 Torino - Italy Tel. +39 011 5549 111 Fax +39 011 53 83 13 15°C

410

400

390

380

370

360

350

340

330

) 320 e 310 MW ( 300

290

280

lectrical power 270 E 260

250

240

230 nd 220 2 GT of the 210 200

190 Cogeneration Plant 180 0 20 40 60 80 100 120 140 160 180 200 220 240 260 Thermal power (MWt)

TG 100% TG 75% TG 45%

The 2nd GT of the Moncalieri plant, The 2nd GT, designed to guarantee the with its capacity of 400 MWe, was maximum efficiency and minimum In cogeneration mode, its total effi- load, steam turbine in electricity only The steam generator The steam turbine built by upgrading the existing plant environmental impact currently avai- ciency is 90%. mode without extraction of steam for from a conventional cycle to coge- lable, is made up principally of: As a back-up, for the production of heat the district heating network; The gas turbine exhaust gas temperature possible and The heat recovery steam generator The condensation steam turbine is neration with a capacity of 141 MW, • Gas turbine that generates about 270 • Heat production system for the di- in cogeneration mode for district hea- • Gas turbine with continuous nominal Functional characteristics thus optimum steam conditions also in has the following characteristics: made up of separate high, medium the partial load range. using the very latest technologies for MW of electricity under ISO conditions strict heating network (260 MWt) in ting, the existing conventional cycle, fed load, steam turbine out of order, ma- The turbine (fed with natural gas) is a • Three pressure levels; and low pressure turbine sections. The LP turbine has a dual-flow design. the simultaneous production of elec- with an efficiency of about 39%; the form of water superheated to by a boiler with a capacity of 420 t/hour ximum extraction of steam from by- The functions of the thermoelectric po- single-shaft machine with a 15-stage The turbine also comprises a hydraulic • Degassing tower built into the cylin- The bodies of the three turbine sections The blades of the turbine provide th- tricity and heat. • Heat recovery steam generator, with 120°C, whose operation is based on of steam at 144 bars and 540°C, was pass system for district heating net- wer plant include: air compression section (final pressure system for recovering the axial play in drical low-pressure body; (HP, MP, LP) consist of two “half-shells”. ree-dimensional flow optimization. the blades that ensures a further im- The unit, with its 260 MWt, together with three pressure levels, fed with hot the extraction of steam at a low pres- maintained. work; • Production of electricity and heat for 17 bars) combined with a 4-stage tur- • High efficiency thermal design with The fixed support is situated between The HP and MP valves are made up the 2rd GT, constitutes the main source of exhaust gas from the gas turbine sure and temperature from the steam • Gas turbine with continuous nomi- district heating; bine section. provement in performance. small-diameter tubes and tabs den- the HP and MP turbine sections. of separate regulation and quick stop heat for the Turin district heating system, (660 kg/s at a temperature of almost turbine and/or by-pass system; nal load, steam turbine out of order • Operation under partial loads above The turbine’s hollow shaft, of the type sely arranged in a quincunx confor- valves. The steam flows downwards one of the largest in Europe. 600°C), without a smoke bypass flue; • Unit heater heat-based dissipation Operating conditions without extraction of steam from the minimum technical level to allow with blade holding rings, ensures short mation; in the condenser situated below the The plant provides the district heating • Condensation steam turbine with a system with a capacity of about 340 bypass system for district heating use of these loads; start-up times (34 minutes from rest to • Natural circulation, based on bro- turbine. network with water at a temperatu- capacity of about 141 MW in a con- MWt, at an ambient temperature of The plant will provide optimum perfor- network. • Operation of the unit from the central full load) due to the low thermal inertia ad-diameter cylindrical bodies with Steam for the district heating system e TORINO NORD re of 120°C, distributed by the pum- ventional cycle with regulated ex- 30°C, for cooling the superheated di- mance under the following main ope- The plant will, in any case, operate un- control room without any need for and adapts rapidly to variations in the high-efficiency separators and high can be extracted from two steam ping system to the end user devices traction of steam at a low pressure strict heating water, which may be rating conditions: der all the intermediate conditions in- any local actions; demand for power with an upward po- circulation stability in the evapora- taps on the medium pressure turbi- through the vast underground pipe for the production of heat for the di- used by the 2nd and 3rd GTs, if the • Gas turbine with continuous nominal dicated in the graph above. • Protection of all mechanical compo- wer gradient of 13 MW/min. tion circuits; ne section. network. strict heating network; water flow from the off-take canal is nents against faults or failures (for The blades of the turbine, subjected to • “Hanging” support to allow free The existing generator, which is • Tube nest condensation system, co- insufficient; example, in case of gas turbine or ste- extreme stress, are air-cooled internal- downward expansion of the heat hydrogen cooled, has been replaced oled by the water coming from the am turbine cut-out); ly and protected externally by a cushion exchange elements; with an air-cooled one of an equiva- nd of cooling air blown in through laser- • Cold wall closure (insulated internal- lent capacity. off-take canal of the river Po (about In electricity mode, the 2 GT reaches • Operation in a single cycle with by- POLYTECHNIC 5,000 kg/s); a total efficiency of over 58%. pass to the condenser for a limited drilled holes. ly) with structure and reinforcements

period of time. Adjustable direction blades at the inlet Cogeneration plants welded externally; of the compressor enable the extracted MIRAFIORI NORD • Fully welded pressurized parts; Supplementary and back-up plants air flow rate to be adapted to the power • Completely drainable heat exchange District heated area of the machine to allow the maximum elements. BIT

MONCALIERI 15°C

410

400

390

380

370

360

350

340

330

) 320 e 310 MW ( 300

290

280

lectrical power 270 E 260

250

240

230 nd 220 2 GT of the 210 200

190 Cogeneration Plant 180 0 20 40 60 80 100 120 140 160 180 200 220 240 260 Thermal power (MWt)

TG 100% TG 75% TG 45%

The 2nd GT of the Moncalieri plant, The 2nd GT, designed to guarantee the with its capacity of 400 MWe, was maximum efficiency and minimum In cogeneration mode, its total effi- load, steam turbine in electricity only The steam generator The steam turbine built by upgrading the existing plant environmental impact currently avai- ciency is 90%. mode without extraction of steam for from a conventional cycle to coge- lable, is made up principally of: As a back-up, for the production of heat the district heating network; The gas turbine exhaust gas temperature possible and The heat recovery steam generator The condensation steam turbine is neration with a capacity of 141 MW, • Gas turbine that generates about 270 • Heat production system for the di- in cogeneration mode for district hea- • Gas turbine with continuous nominal Functional characteristics thus optimum steam conditions also in has the following characteristics: made up of separate high, medium the partial load range. using the very latest technologies for MW of electricity under ISO conditions strict heating network (260 MWt) in ting, the existing conventional cycle, fed load, steam turbine out of order, ma- The turbine (fed with natural gas) is a • Three pressure levels; and low pressure turbine sections. The LP turbine has a dual-flow design. the simultaneous production of elec- with an efficiency of about 39%; the form of water superheated to by a boiler with a capacity of 420 t/hour ximum extraction of steam from by- The functions of the thermoelectric po- single-shaft machine with a 15-stage The turbine also comprises a hydraulic • Degassing tower built into the cylin- The bodies of the three turbine sections The blades of the turbine provide th- tricity and heat. • Heat recovery steam generator, with 120°C, whose operation is based on of steam at 144 bars and 540°C, was pass system for district heating net- wer plant include: air compression section (final pressure system for recovering the axial play in drical low-pressure body; (HP, MP, LP) consist of two “half-shells”. ree-dimensional flow optimization. the blades that ensures a further im- The unit, with its 260 MWt, together with three pressure levels, fed with hot the extraction of steam at a low pres- maintained. work; • Production of electricity and heat for 17 bars) combined with a 4-stage tur- • High efficiency thermal design with The fixed support is situated between The HP and MP valves are made up the 2rd GT, constitutes the main source of exhaust gas from the gas turbine sure and temperature from the steam • Gas turbine with continuous nomi- district heating; bine section. provement in performance. small-diameter tubes and tabs den- the HP and MP turbine sections. of separate regulation and quick stop heat for the Turin district heating system, (660 kg/s at a temperature of almost turbine and/or by-pass system; nal load, steam turbine out of order • Operation under partial loads above The turbine’s hollow shaft, of the type sely arranged in a quincunx confor- valves. The steam flows downwards one of the largest in Europe. 600°C), without a smoke bypass flue; • Unit heater heat-based dissipation Operating conditions without extraction of steam from the minimum technical level to allow with blade holding rings, ensures short mation; in the condenser situated below the The plant provides the district heating • Condensation steam turbine with a system with a capacity of about 340 bypass system for district heating use of these loads; start-up times (34 minutes from rest to • Natural circulation, based on bro- turbine. network with water at a temperatu- capacity of about 141 MW in a con- MWt, at an ambient temperature of The plant will provide optimum perfor- network. • Operation of the unit from the central full load) due to the low thermal inertia ad-diameter cylindrical bodies with Steam for the district heating system e TORINO NORD re of 120°C, distributed by the pum- ventional cycle with regulated ex- 30°C, for cooling the superheated di- mance under the following main ope- The plant will, in any case, operate un- control room without any need for and adapts rapidly to variations in the high-efficiency separators and high can be extracted from two steam ping system to the end user devices traction of steam at a low pressure strict heating water, which may be rating conditions: der all the intermediate conditions in- any local actions; demand for power with an upward po- circulation stability in the evapora- taps on the medium pressure turbi- through the vast underground pipe for the production of heat for the di- used by the 2nd and 3rd GTs, if the • Gas turbine with continuous nominal dicated in the graph above. • Protection of all mechanical compo- wer gradient of 13 MW/min. tion circuits; ne section. network. strict heating network; water flow from the off-take canal is nents against faults or failures (for The blades of the turbine, subjected to • “Hanging” support to allow free The existing generator, which is • Tube nest condensation system, co- insufficient; example, in case of gas turbine or ste- extreme stress, are air-cooled internal- downward expansion of the heat hydrogen cooled, has been replaced oled by the water coming from the am turbine cut-out); ly and protected externally by a cushion exchange elements; with an air-cooled one of an equiva- nd of cooling air blown in through laser- • Cold wall closure (insulated internal- lent capacity. off-take canal of the river Po (about In electricity mode, the 2 GT reaches • Operation in a single cycle with by- POLYTECHNIC 5,000 kg/s); a total efficiency of over 58%. pass to the condenser for a limited drilled holes. ly) with structure and reinforcements

period of time. Adjustable direction blades at the inlet Cogeneration plants welded externally; of the compressor enable the extracted MIRAFIORI NORD • Fully welded pressurized parts; Supplementary and back-up plants air flow rate to be adapted to the power • Completely drainable heat exchange District heated area of the machine to allow the maximum elements. BIT

MONCALIERI 15°C

410

400

390

380

370

360

350

340

330

) 320 e 310 MW ( 300

290

280

lectrical power 270 E 260

250

240

230 nd 220 2 GT of the 210 200

190 Cogeneration Plant 180 0 20 40 60 80 100 120 140 160 180 200 220 240 260 Thermal power (MWt)

TG 100% TG 75% TG 45%

The 2nd GT of the Moncalieri plant, The 2nd GT, designed to guarantee the with its capacity of 400 MWe, was maximum efficiency and minimum In cogeneration mode, its total effi- load, steam turbine in electricity only The steam generator The steam turbine built by upgrading the existing plant environmental impact currently avai- ciency is 90%. mode without extraction of steam for from a conventional cycle to coge- lable, is made up principally of: As a back-up, for the production of heat the district heating network; The gas turbine exhaust gas temperature possible and The heat recovery steam generator The condensation steam turbine is neration with a capacity of 141 MW, • Gas turbine that generates about 270 • Heat production system for the di- in cogeneration mode for district hea- • Gas turbine with continuous nominal Functional characteristics thus optimum steam conditions also in has the following characteristics: made up of separate high, medium the partial load range. using the very latest technologies for MW of electricity under ISO conditions strict heating network (260 MWt) in ting, the existing conventional cycle, fed load, steam turbine out of order, ma- The turbine (fed with natural gas) is a • Three pressure levels; and low pressure turbine sections. The LP turbine has a dual-flow design. the simultaneous production of elec- with an efficiency of about 39%; the form of water superheated to by a boiler with a capacity of 420 t/hour ximum extraction of steam from by- The functions of the thermoelectric po- single-shaft machine with a 15-stage The turbine also comprises a hydraulic • Degassing tower built into the cylin- The bodies of the three turbine sections The blades of the turbine provide th- tricity and heat. • Heat recovery steam generator, with 120°C, whose operation is based on of steam at 144 bars and 540°C, was pass system for district heating net- wer plant include: air compression section (final pressure system for recovering the axial play in drical low-pressure body; (HP, MP, LP) consist of two “half-shells”. ree-dimensional flow optimization. the blades that ensures a further im- The unit, with its 260 MWt, together with three pressure levels, fed with hot the extraction of steam at a low pres- maintained. work; • Production of electricity and heat for 17 bars) combined with a 4-stage tur- • High efficiency thermal design with The fixed support is situated between The HP and MP valves are made up the 2rd GT, constitutes the main source of exhaust gas from the gas turbine sure and temperature from the steam • Gas turbine with continuous nomi- district heating; bine section. provement in performance. small-diameter tubes and tabs den- the HP and MP turbine sections. of separate regulation and quick stop heat for the Turin district heating system, (660 kg/s at a temperature of almost turbine and/or by-pass system; nal load, steam turbine out of order • Operation under partial loads above The turbine’s hollow shaft, of the type sely arranged in a quincunx confor- valves. The steam flows downwards one of the largest in Europe. 600°C), without a smoke bypass flue; • Unit heater heat-based dissipation Operating conditions without extraction of steam from the minimum technical level to allow with blade holding rings, ensures short mation; in the condenser situated below the The plant provides the district heating • Condensation steam turbine with a system with a capacity of about 340 bypass system for district heating use of these loads; start-up times (34 minutes from rest to • Natural circulation, based on bro- turbine. network with water at a temperatu- capacity of about 141 MW in a con- MWt, at an ambient temperature of The plant will provide optimum perfor- network. • Operation of the unit from the central full load) due to the low thermal inertia ad-diameter cylindrical bodies with Steam for the district heating system e TORINO NORD re of 120°C, distributed by the pum- ventional cycle with regulated ex- 30°C, for cooling the superheated di- mance under the following main ope- The plant will, in any case, operate un- control room without any need for and adapts rapidly to variations in the high-efficiency separators and high can be extracted from two steam ping system to the end user devices traction of steam at a low pressure strict heating water, which may be rating conditions: der all the intermediate conditions in- any local actions; demand for power with an upward po- circulation stability in the evapora- taps on the medium pressure turbi- through the vast underground pipe for the production of heat for the di- used by the 2nd and 3rd GTs, if the • Gas turbine with continuous nominal dicated in the graph above. • Protection of all mechanical compo- wer gradient of 13 MW/min. tion circuits; ne section. network. strict heating network; water flow from the off-take canal is nents against faults or failures (for The blades of the turbine, subjected to • “Hanging” support to allow free The existing generator, which is • Tube nest condensation system, co- insufficient; example, in case of gas turbine or ste- extreme stress, are air-cooled internal- downward expansion of the heat hydrogen cooled, has been replaced oled by the water coming from the am turbine cut-out); ly and protected externally by a cushion exchange elements; with an air-cooled one of an equiva- nd of cooling air blown in through laser- • Cold wall closure (insulated internal- lent capacity. off-take canal of the river Po (about In electricity mode, the 2 GT reaches • Operation in a single cycle with by- POLYTECHNIC 5,000 kg/s); a total efficiency of over 58%. pass to the condenser for a limited drilled holes. ly) with structure and reinforcements

period of time. Adjustable direction blades at the inlet Cogeneration plants welded externally; of the compressor enable the extracted MIRAFIORI NORD • Fully welded pressurized parts; Supplementary and back-up plants air flow rate to be adapted to the power • Completely drainable heat exchange District heated area of the machine to allow the maximum elements. BIT

MONCALIERI 15°C

410

400

390

380

370

360

350

340

330

) 320 e 310 MW ( 300

290

280

lectrical power 270 E 260

250

240

230 nd 220 2 GT of the 210 200

190 Cogeneration Plant 180 0 20 40 60 80 100 120 140 160 180 200 220 240 260 Thermal power (MWt)

TG 100% TG 75% TG 45%

The 2nd GT of the Moncalieri plant, The 2nd GT, designed to guarantee the with its capacity of 400 MWe, was maximum efficiency and minimum In cogeneration mode, its total effi- load, steam turbine in electricity only The steam generator The steam turbine built by upgrading the existing plant environmental impact currently avai- ciency is 90%. mode without extraction of steam for from a conventional cycle to coge- lable, is made up principally of: As a back-up, for the production of heat the district heating network; The gas turbine exhaust gas temperature possible and The heat recovery steam generator The condensation steam turbine is neration with a capacity of 141 MW, • Gas turbine that generates about 270 • Heat production system for the di- in cogeneration mode for district hea- • Gas turbine with continuous nominal Functional characteristics thus optimum steam conditions also in has the following characteristics: made up of separate high, medium the partial load range. using the very latest technologies for MW of electricity under ISO conditions strict heating network (260 MWt) in ting, the existing conventional cycle, fed load, steam turbine out of order, ma- The turbine (fed with natural gas) is a • Three pressure levels; and low pressure turbine sections. The LP turbine has a dual-flow design. the simultaneous production of elec- with an efficiency of about 39%; the form of water superheated to by a boiler with a capacity of 420 t/hour ximum extraction of steam from by- The functions of the thermoelectric po- single-shaft machine with a 15-stage The turbine also comprises a hydraulic • Degassing tower built into the cylin- The bodies of the three turbine sections The blades of the turbine provide th- tricity and heat. • Heat recovery steam generator, with 120°C, whose operation is based on of steam at 144 bars and 540°C, was pass system for district heating net- wer plant include: air compression section (final pressure system for recovering the axial play in drical low-pressure body; (HP, MP, LP) consist of two “half-shells”. ree-dimensional flow optimization. the blades that ensures a further im- The unit, with its 260 MWt, together with three pressure levels, fed with hot the extraction of steam at a low pres- maintained. work; • Production of electricity and heat for 17 bars) combined with a 4-stage tur- • High efficiency thermal design with The fixed support is situated between The HP and MP valves are made up the 2rd GT, constitutes the main source of exhaust gas from the gas turbine sure and temperature from the steam • Gas turbine with continuous nomi- district heating; bine section. provement in performance. small-diameter tubes and tabs den- the HP and MP turbine sections. of separate regulation and quick stop heat for the Turin district heating system, (660 kg/s at a temperature of almost turbine and/or by-pass system; nal load, steam turbine out of order • Operation under partial loads above The turbine’s hollow shaft, of the type sely arranged in a quincunx confor- valves. The steam flows downwards one of the largest in Europe. 600°C), without a smoke bypass flue; • Unit heater heat-based dissipation Operating conditions without extraction of steam from the minimum technical level to allow with blade holding rings, ensures short mation; in the condenser situated below the The plant provides the district heating • Condensation steam turbine with a system with a capacity of about 340 bypass system for district heating use of these loads; start-up times (34 minutes from rest to • Natural circulation, based on bro- turbine. network with water at a temperatu- capacity of about 141 MW in a con- MWt, at an ambient temperature of The plant will provide optimum perfor- network. • Operation of the unit from the central full load) due to the low thermal inertia ad-diameter cylindrical bodies with Steam for the district heating system e TORINO NORD re of 120°C, distributed by the pum- ventional cycle with regulated ex- 30°C, for cooling the superheated di- mance under the following main ope- The plant will, in any case, operate un- control room without any need for and adapts rapidly to variations in the high-efficiency separators and high can be extracted from two steam ping system to the end user devices traction of steam at a low pressure strict heating water, which may be rating conditions: der all the intermediate conditions in- any local actions; demand for power with an upward po- circulation stability in the evapora- taps on the medium pressure turbi- through the vast underground pipe for the production of heat for the di- used by the 2nd and 3rd GTs, if the • Gas turbine with continuous nominal dicated in the graph above. • Protection of all mechanical compo- wer gradient of 13 MW/min. tion circuits; ne section. network. strict heating network; water flow from the off-take canal is nents against faults or failures (for The blades of the turbine, subjected to • “Hanging” support to allow free The existing generator, which is • Tube nest condensation system, co- insufficient; example, in case of gas turbine or ste- extreme stress, are air-cooled internal- downward expansion of the heat hydrogen cooled, has been replaced oled by the water coming from the am turbine cut-out); ly and protected externally by a cushion exchange elements; with an air-cooled one of an equiva- nd of cooling air blown in through laser- • Cold wall closure (insulated internal- lent capacity. off-take canal of the river Po (about In electricity mode, the 2 GT reaches • Operation in a single cycle with by- POLYTECHNIC 5,000 kg/s); a total efficiency of over 58%. pass to the condenser for a limited drilled holes. ly) with structure and reinforcements

period of time. Adjustable direction blades at the inlet Cogeneration plants welded externally; of the compressor enable the extracted MIRAFIORI NORD • Fully welded pressurized parts; Supplementary and back-up plants air flow rate to be adapted to the power • Completely drainable heat exchange District heated area of the machine to allow the maximum elements. BIT

MONCALIERI 2nd GT of the Cogeneration Plant 2013 october

Functional diagram

Steam generator with three pressure levels pressure (bar) capacity (Kg/s) temperature (°C) • AP 94 76,4 542 G • MP 28 87,9 542 3~ • BP 4,6 9,7 225 www.irenenergia.it MONCALIERI PLANT 2ND GT Gas turbine • Capacity 270 MW Steam turbine • Fuel natural gas • Capacity 141 MW

AP MP BP G 3~ Iren Energia is the company in the Iren Group whose core The plant is made up of two combined-cycle cogeneration businesses are the production and distribution of electri- units (2nd GT and 3rd GT), with an overall electrical capacity city, the production and distribution of thermal energy for of 800 MW and a thermal capacity of 520 MW in cogene - district heating and the provision of technological services. ration mode, and a supplementary and back-up plant with a capacity of 141 MW. water-cooled condenser Iren Energia constantly pursues its objectives, which are qua- canal lity, reliability, sustainable development, energy efficiency The heat produced by the cogenerators provides district and a close relationship with the areas in which it operates. heating for a total volume of 55 million cubic metres, The 2nd GT is part of the Moncalieri cogeneration plant, which, making Turin the city with the largest district heating sy - Heat exchangers for district together with the Torino Nord plant, supplies Turin’s district stem in Italy. heating • Thermal power 260 MW heating network. • Inlet temperature 70°C • Outlet temperature 120°C district heating

TEST DATA Combined-cycle operation Combined-cycle and cogeneration operation ISO conditions on site ISO conditions on site

• Net electrical power 395 MW • Net electrical power 340 MW • Efficiency 58% • Thermal power 260 MW • Efficiency 90%

Iren Energia S.p.A. Corso Svizzera, 95 10143 Torino - Italy Tel. +39 011 5549 111 Fax +39 011 53 83 13