Ansaldo Solution for Geothermal Power Plants

8/16/2019 Ansaldo Solution for Geothermal Power Plants

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SOLUTIONS FORGEOTHERMAL

POWER PLANTS


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Ansaldo Energia

and Geothermal Energy

Geothermal energy is a valuable, renewable

natural energy comparable to hydroelectric

energy and it is environment-friendly becau-

se it generates electric power without burning

fossil fuel.

Ansaldo Energia, a Finmeccanica company,

banking on more than one century of experien-

ce in power generation, with a total installedcapacity of over 175,000 MW, is a distingui-

shed player in the energy industry, providing

reliable and flexible solutions in the power ge-

neration sector across a complete and inno-

vative products portfolio including equipment

and plant designs, engineering, manufactu-

ring, contracting, service activities and cu-

stomers assistance for thermal, geothermal,

combined cycle and many activities for nuclear

power plants.

Ansaldo Energia’s experience with geothermal

power plants dates back to 1913, when the

first turbine-generator unit ever driven by geo-thermal steam rated 250 kW, entered service

at Larderello (Italy).

Since then units totalling over 2,000 MW have

been installed both in Italy and abroad.


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Ansaldo Energia can provide optimized solu-

tions for geothermal power plants in the range

20 to 150 MW for 50 and 60 Hz markets.

Plant design, supply and installation

Ansaldo Energia can provide not only steam

turbine - generator sets, but also complete in-

tegrated package including architecture, civil,

mechanical, electrical and automation design,

supply of equipment, installation and commis-

sioning of the power plant.

Steam Turbine

Ansaldo Energia is one of the

world leading suppliers of geo-

thermal turbines/generators.

The Company’s extensive expe-rience (more than 130 geother-

mal units installed) has enabled

Ansaldo Energia to achieve a

high level of reliability and ef-

ficiency as well as remarkable

flexibility in terms of adapting to

different steam conditions and

plant arrangements.

State-of-the art technology, and

cutting edge construction me-

thods are used to provide diffe-

rent turbine models for different

geothermal steam conditions

and power output levels and to

upgrade old units to match changed steam

conditions.

Careful material selection, due to the presen-

ce in the fluid of corrosive chemicals such as

H2S, chlorides and salts, is extremely impor-

tant to ensure reliability and minimize outages

for maintenance. Ansaldo Energia has carriedout detailed studies to test the corrosion resi-

stance of various turbine materials to geother-

mal steam.

All turbine components in contact with the fluid

are made of stainless steel, including the rotor

when required by the fluid characteristics.

Equipment

for Geothermal Power Plants

20 MW - Shop assembly


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Geothermal steam turbine configurations:

90-150 MW Four Flow

20-60 MW Single Flow 50-100 MW Double Flow

Features

Impulse construction,

with new generation

airfoil and sealing

Single, double,

four flow

configuration

Top, lateral, axial

exhaust in addition

to conventional

down exhaust

Patented design

solutions to prevent

problems arising

from dissolved solids

Moistureprotection

Benefits

High efficiency

and better protection

against foreign

materials on steam path

Compact design with well

proven 20”, 23”, 26”,

31” LSB

Simple, low profile

arrangement

Simplified

maintenance

Higher efficiency andbetter protection against

blade erosion

Geothermal steam turbine design features:

Moisture Protection

Drain catcher applied

to each stage

Stellite laser cladding onleading edge of L-0 & L-1

(if necessary)

Hollow nozzle with slotson suction side to removemoisture

Moisture removal

groove on moving blades


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Generator

Air cooled generator in closed circuit (TEWAC),

featuring a modular, compact design and high

efficiency:

• Rated output: depends on the size

• Class F insulation system

• Power factor 0.8

• Rated voltage 11.5 or 13.8 kV• Static excitation

Specific features are introduces for geother-

mal application to protect the copper from

H2S corrosion (special painting, gold plating,

tinning, etc.).

Condenser

Since the condensate does not have to be re-

covered, a spray type direct contact condenser

is often used.

The condenser is arranged beneath the turbi-

ne or laterally connected by means of a cros-

sover steam duct.

The water is injected into the condensing cham-

ber by means of a network system consisting

of manifolds, pipes and spray nozzles.

The condensing chamber is connected to two

gas cooler sections where the final condensa-

tion takes place, in addition to non condensa-ble gases temperature abatement by means of

the spray nozzles on the top and trays arran-

ged beneath the nozzles.

The nozzles of the whirl-jet type are with ample

orifice section to prevent clogging and are ea-

sily removable for inspection and cleaning.

The Condenser shell and internals are in

stainless steel.

Non condensable gas removal system

Since the geothermal steam flowing into the con-

denser contains a large amount of non condensa-

ble gas, essentially carbon dioxide (CO2), a high

efficiency extraction system shall be provided.

Two options are available:

• Steam ejectors

• Centrifugal compressor driven by an electric

motor or coupled to the turbo-generator.

The choice between the two is based on the

gas percentage in the geothermal steam:

steam ejectors are preferred for low gas content.

3 x 55 MW - Gunung Salak

(Indonesia)


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Control System

The control system, based on proven

architecture developed by Ansaldo

Energia, with reliable hardware, sof-

tware and system interfaces delivers

information to operators and decision

makers in an easy usable format and

handles operation, maintenance, con-

trol efficiency and safety in such away as to minimize outages.

Control system development is based

on functional segregation between:

• Balance of Plant

• Steam Turbine Auxiliary control loop

and slow control loop

• Steam Turbine Governor

• Protection System

The control system includes the su-

pervisory system which provides the

information needed to assess the

mechanical condition of rotating ma-

chinery.

These systems continuously measure

and monitor a variety of supervisory

parameters, providing crucial information for

early identification of machinery problems.

Services

Ansaldo Energia, with its long standing expe-

rience in the geothermal power plant sectorcan provide a wide range of services for both

OEM and NON-OEM geothermal plants:

• New turbines and generators tailor made

for old geothermal plants

• Steam path upgrading for existing units

to match changed steam conditions

• Repairing damaged equipment

• Supplying replacement parts

• Generator rewinding

• Control system

20 MW - Rancia 1-2 (Italy)

40 MW - 20 MW Nuova Radicondoli and Radicondoli 2 (Italy)


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Ansaldo Energia Geothermal

Steam Turbine References in the World

16152 Genova - Via N. Lorenzi, 8 - Italy

Tel: +39 010 6551 - Fax: +39 010 655 3411

E-mail: [email protected]

ansaldoenergia.com

MEXICO

Los Humeros/Los Azufres 10 x 5 MWPathe 1 x 2 MW

ITALY

> 110 Units> 1600 MW

TURKEY

Kizildere 1 x 18 MW

INDONESIA

Gunung Salak 3 x 55 MWDieng 1 x 60 MW

PHILIPPINES

Bacon Manito 2 x 55 MWNICARAGUA

Momotombo2 x 35 MW

COSTARICA

Miravalles1 x 55 MW

USA

Middle Town2 x 55 MW

S t a m p a : M i c r o a r t R e c c o -

G e n o v a

0 5 / 2 0 1 2

P e t e r g r a f

Ansaldo Solution for Geothermal Power Plants

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