STEAM TURBINES

Steam Turbines

Ansaldo Energia has 100 years’ experience in the design, manufacturing and installation of steam turbines. It has supplied about 700 steam turbines worldwi-de 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 robu-stness of Ansaldo Energia products: the result is a unique and balanced value package based on innovation and reliability.

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

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

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

Geothermal Cycles

0 200 100 300 1,000

Types and applications Series

Reheat Turbines

Non-Reheat Turbines

Geothermal Turbines

150

RT30, RT70 (3 to 5-cylinder)

90 300

350

1000

MT15 (2-cylinder)

150

MT20 (2-cylinder)

40 250

MT10 (1-cylinder)

20 150

GT

Power output [MW]

RT30 Steam Turbine

MT10 Steam Turbine

MT15 Steam Turbine

BladingOver the years of its technological history, An-saldo 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 geo-thermal and small-size steam turbines. All blades have 3D airfoil design to maximize sta-ge 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 pressu-re requirements.

Advanced design features

48” last stage blade

Steam Turbine IP/LP rotor

Modular design concept

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

Separate HP and IP sections Generally, Ansaldo Energia steam turbines for rehe-at applications have separate HP, IP and LP sec-tions to deliver the highest possible sustained effi-ciency and good thermal flexibility. For output up to 350 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 mas-sive horizontal flange. The shrink rings hold the two half inner casings together to form a symme-trical, light geometry with uniform mass distribu-tion. 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

Axial and side exhaust arrangement

In addition to the traditional downward exhausts for single and double flow configurations, low pres-sure modules are available for single flow axial exhaust or double flow side exhaust to the con-denser. Axial and side exhaust modules, developed pri-marily 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.

Steam Turbine with lateral exhaust

HP section shrink ring design

REhEAT STEAM TURBINES CoNfIgURATIoNS

RT70 (400-1000 MW)

MT15 (90-300 MW)

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 submer-ged arc processes in a dedicated rotor welding shop. This technique allows the use of different ma-terials 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 for-gings. Moreover welded rotors have better thermal fle-xibility, which is a significant advantage for start-up, shut-down and load changes.

LP rotor welding in Ansaldo Energia factory

RT30 (150-400 MW)

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.

Steam Turbines for Combined Cycles

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.

Product Line

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

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.

ApplicationsThe following references show examples of the aforemetioned product lines.

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

Ansaldo Energia Steam TurbinesReferences in the World

16152 Genova - Via N. Lorenzi, 8 - ItalyTel: +39 010 6551 - Fax: +39 010 655 3411

E-mail: ansaldoenergia@aen.ansaldo.it

ansaldoenergia.com

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SAUDI ARABIA (19)1,908 MW

GREECE (6)891 MW

ALBANIA (1)30 MW

CROATIA (1)320 MW

AUSTRIA (1)160 MW

BELGIUM (4)1,123 MW

DENMARK (2)967 MW

UK (5)308 MW

FRANCE (3)1,375 MW

SPAIN (1)273 MW

EGYPT (10)2,345 MW

LABANON (7)940 MW JORDAN (5)

365 MW

COTE D’IVOIRE (2)150 MW

MOROCCO (8)900 MW

TUNISIA (4)750 MW

BOTSWANA (1)64 MW

ARGENTINA (12) 1,587 MW

URUGUAY (1) 125 MW

BRAZIL (7)674 MW

VENEZUELA (3)99 MW

SOUTH AFRICA (1)50 MW

TURKEY (5)782 MW

MALTA (4)85 MW

CHINA (7)2,139 MW

SOUTH KOREA (1)200 MW

RUSSIA (1)167 MW

BAHRAIN (4)121 MW

AUSTRALIA (2)850 MW

INDONESIA (4)225 MW

MALAYSIA (1)99 MW

THAILAND (3)225 MW

PHILIPPINES (2)110 MW

INDIA (12)2,016 MW

PAKISTAN (7)1,792 MW

ITALY (355)50,921 MW

ALGERIA (7)1,000 MW

CHILE (9)2,023 MW

COSTA RICA (1)55 MW

NICARAGUA (5)221 MW

GUATEMALA (1)53 MW

JAMAICA (1)33 MW

MEXICO (21)2,365 MW

EQUADOR (1)132 MW

PUERTO RICO (2)150 MW

PANAMA (3)120 MW

USA (8)276 MW

SYRIA (7)839 MW

YEMEN (9)325 MW

UAE (12)875 MW

OMAN (1)220 MW

LYBIA (2)40 MW

OTHER MIDDLE EAST (23)4,721 MW

ZIMBABWE (2)440 MW

Ansaldo Energia Steam Turbine references since 1950 are here represented. Ansaldo Energia produces Steam Turbines since 1910’s

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