STEAM TURBINES

Steam Turbines

MT10 Steam Turbine

Ansaldo Energia has 100 years’ experience in the design, manufacturing and installation of steam turbines. It has supplied about 700 steam turbines worldwide with a total capacity of nearly 100 GW. Dedicated R&D and Service organizations assist Clients with continuous product improvements, combined with the traditional reliability and robustness of Ansaldo Energia products: the result is a unique and balanced value package based on innovation and reliability.

MT15 Steam Turbine

Ansaldo Energia has a comprehensive portfolio of 50 Hz and 60 Hz non-reheat and reheat steam turbines ranging from 40 MW to 1000 MW for conventional steam cycles, combined cycles and cogeneration applications. In addition Ansaldo Energia offers a complete line of geothermal steam turbines from 20 MW to 150 MW. Types and applications

RT30 Steam Turbine

Series

Reheat Turbines 3 to 5-cylinder: RT30, R70

• Thermal Fossil-fired Steam Cycles • Combined Cycles • Cogeneration Plants • Solar Plants

150

2-cylinder: MT15 90

350

Non-Reheat Turbines 2-cylinder: MT20 • Thermal Fossil-fired Steam Cycles • Combined Cycles • Cogeneration Plants • Solar Plants

150

1-cylinder: MT10 40

250

Geothermal Turbines GT

Geothermal Cycles

20

0

150

100

200

1,000 300 Power output [MW]

Advanced design features

Modular design concept Ansaldo Energia steam turbines are based on a modular concept to reduce technical risk and manufacturing time and ensure high reliability. Each model is a combination of well-proven, pre-engineered modules of different sizes, to provide a broad range of power ratings and applications. Several different material options are available to meet different steam conditions up to the most advanced ultra supercritical parameters (600°C/620°C).

Steam Turbine IP/LP rotor

Blading Over the years of its technological history, Ansaldo Energia has designed both impulse and reaction steam turbines. Today Ansaldo Energia steam turbines are based on reaction technology, while the impulse design is maintained in geothermal and small-size steam turbines. All blades have 3D airfoil design to maximize stage efficiency, achieving 92% of efficiency in the HP section and 94% in the IP section. LP last stage blading The development of longer last stage blades is one of the most effective solutions to achieve a compact and a highly efficient turbine design. A family of modern last stage blades up to 48” is available, with free standing or coupled solution, to satisfy any cooling condition and back pressure requirements.

48” last stage blade

Separate HP and IP sections Generally, Ansaldo Energia steam turbines for reheat applications have separate HP, IP and LP sections to deliver the highest possible sustained efficiency and good thermal flexibility. For output up to 300 MW, a compact, combined, single flow IP/LP solution is available, thanks also to the use of the welding technique used for the IP/LP rotor. Shrink ring design The HP inner casing of reheat turbines has a shrink ring design that does not require any massive horizontal flange. The shrink rings hold the two half inner casings together to form a symmetrical, light geometry with uniform mass distribution. They are assembled or removed by heating them with annular gas burners. The advantages of this solution are: • rapid start-up and shut-down and excellent behavior during load changes • simple dismantling and reassembly during maintenance

HP section shrink ring design

Steam Turbine with lateral exhaust

Axial and side exhaust arrangement In addition to the traditional downward exhausts for single and double flow configurations, low pressure modules are available for single flow axial exhaust or double flow side exhaust to the condenser. Axial and side exhaust modules, developed primarily for combined cycle applications, allow installation of the turboset on low foundations, minimising overall foundation costs and reducing the overall height of the machine building.

Welded rotors Ansaldo Energia uses the welding technique for rotor manufacturing, in which the rotors are built from forged disks and welded together using a combination of tungsten inert gas and submerged arc processes in a dedicated rotor welding shop. This technique allows the use of different materials for HP, IP and IP/LP rotors, providing high temperature resistance at the hot end and high toughness at the cold end, and allowing large LP rotors to be manufactured from smaller forgings. Moreover welded rotors have better thermal flexibility, which is a significant advantage for startup, shut-down and load changes.

LP rotor welding in Ansaldo Energia factory

Reheat Steam Turbines Configurations MT15 (90-350 MW)

RT70 (500-1000 MW)

RT30 (150-500 MW)

Product Line

Steam Turbines for Conventional Steam Cycles Today’s medium and large power generation steam turbines are mainly reheat type with regenerative feed water cycle and possible district heating applications. Ansaldo Energia offers three steam turbine models, specifically designed to satisfy all possible Client requirements in terms of operating conditions, performance and reliability, including steam turbines for ultra supercritical applications. MT15

Separate High Pressure (HP) and combined Intermediate / Low Pressure (IP/LP) cylinders

RT30

Separate High Pressure (HP), single flow Intermediate Pressure (IP) and Low Pressure (LP) cylinders

RT70

Separate High Pressure (HP), double flow Intermediate Pressure (IP) and Low Pressure (LP) cylinders

0

100

200

300

400

500

1000

Rating [MW]

Steam Turbines for Combined Cycles

NON REHEAT

Steam turbines for reheat and non-reheat combined cycles must be easy to adapt to different gas turbine configurations (number and models) and steam conditions delivered by various heat recovery steam generators. Ansaldo Energia offers four steam turbine models able to meet the full range of Client requirements and all specific site conditions. MT10

Combined High Pressure / Low Pressure (HP/LP) cylinders

MT20

Separate High Pressure (HP) and Low pressure (LP) cylinders

REHEAT

MT15C

Separate High Pressure (HP) and combined Intermediate / Low Pressure (IP/LP) cylinders

RT30C

Separate High Pressure (HP), Intermediate Pressure (IP) and Low Pressure (LP) cylinders

0

100

200 Rating [MW]

300

400

Cogeneration Steam Turbines These turbines, either back pressure or condensing, with or without controlled extractions, are used in industrial, desalination and district heating power plants. As it is basically the process that dictates the steam parameters and therefore the turbine design, each cogeneration steam turbine is a unique product, tailored to the specific needs of the Client.

Applications The following references show examples of the aforemetioned product lines. Steam Turbines for Conventional Steam Cycles • • • • • •

Avedøre 2 - Denmark Cl t: SK Energy Ansaldo Energia scope of supply: Power Block including one RT30 steam turbine and generator Power output: 535 MW Steam parameters: 300 bar/580°C/600°C Commercial operation: 2001

Steam Turbines for Combined Cycles • Sidi Krir and El Alf - Egypt • Client: W.D.E.P. 2x(2+1) Combined cycles with F class gas turbines • Ansaldo Energia scope of supply for plant: one RT30 steam turbine, turbogenerator, condenser, bypass • Power output: 275 MW • Steam parameters: 125 bar/565°C/565°C • Commercial operation: 2010 Cogeneration Steam Turbines • • • • • • •

Barka I - Oman Client: ACWA Power 2+1 Combined cycle desalination plant with E class gas turbines Ansaldo Energia scope of supply: two AE94.2 gas turbines, one MT20 steam turbine and relative generators Steam turbine power output: 220 MW Steam parameters: 77 bar/541°C Commercial operation: 2003

Petergraf 05/2012 Stampa: Microart Recco - Genova

Ansaldo Energia Steam Turbines References in the World RUSSIA (1) 167 MW

DENMARK (2) 967 MW

PUERTO RICO (2) 150 MW

CROATIA (1)

BELGIUM (4)

UK (5)

320 MW

1,123 MW

308 MW

ALBANIA (1)

USA (8)

30 MW

276 MW

AUSTRIA (1)

FRANCE (3)

GREECE (6)

160 MW

SPAIN (1)

200 MW

TURKEY (5)

273 MW

VENEZUELA (3)

SOUTH KOREA (1)

891 MW

1,375 MW

782 MW

MALTA (4)

THAILAND (3)

85 MW

99 MW

ITALY (355)

MEXICO (21)

50,921 MW

2,365 MW

JAMAICA (1)

CHINA (7)

LYBIA (2)

MOROCCO (8)

225 MW

MALAYSIA (1)

2,139 MW

99 MW

40 MW

900 MW

33 MW

ALGERIA (7) GUATEMALA (1)

YEMEN (9)

COTE D’IVOIRE (2)

325 MW

150 MW

COSTA RICA (1)

AUSTRALIA (2)

EGYPT (9)

55 MW

ZIMBABWE (2)

2,066 MW

URUGUAY (1)

PANAMA (3) CHILE (7) BRAZIL (7) 674 MW

225 MW

509 MW

132 MW

120 MW

INDONESIA (4) OTHER MIDDLE EAST (23) 4,721 MW

TUNISIA (3)

EQUADOR (1)

221 MW

110 MW

220 MW

53 MW

NICARAGUA (5)

PHILIPPINES (2)

OMAN (1)

1,000 MW

125 MW

440 MW

SOUTH AFRICA (1) 50 MW

1,483 MW

ARGENTINA (12) 1,587 MW

BOTSWANA (1) 64 MW

SYRIA (6) 598 MW

940 MW

BAHRAIN (4)

JORDAN (5) 365 MW

Ansaldo Energia Steam Turbine references since 1950 are here represented.

16152 Genova - Via N. Lorenzi, 8 - Italy Tel: +39 010 6551 - Fax: +39 010 655 3411 E-mail: [email protected]

ansaldoenergia.com

875 MW

PAKISTAN (7) 121 MW

LABANON (7)

850 MW

UAE (12)

INDIA (12)

1,792 MW

2,016 MW

SAUDI ARABIA (19) 1,908 MW