GT24 and GT26 Gas Turbines - Clean, high performance,...

Clean / High performance / Flexible

POWER

GT24/GT26GAS TURBINE

GT24-26_10_08:Interior_A4Portrait 24/10/08 10:35

Utilities, independent power producers and merchant power generators face unprecedentedchange - deregulation and tougher competition, shifting consumption trends and more stringentemissions legislation. They also need to ensure reliability of supply yet reduce the cost per kilowatthour of producing electricity. Raising efficiency remains a constant challenge. And finally theflexibility to fuel gas composition needs to be addressed in times of global transport of fuel gas.

Alstom has addressed all these issues. The result is the compact GT24 (60 Hz) and GT26 (50 Hz)sequential combustion gas turbines, a solution that lowers the kilowatt hour cost without reducingavailability by raising the efficiency close to 60% in combined-cycle operation.Their unusually low environmental emissions are achieved thanks to Alstom's unique, sequentialcombustion technology burning the fuel in two dry low NOx combustors. And it can do all thiswith low firing temperatures and with burners which are robust enough to cope with wide fuel gascompositions that are seen in the market today. In addition, while efficiency levels and powerdensity increase, operational flexibility of the GT24/GT26 engines is significantly improved.Their turn down capability is unique in the market today. Meaning that, with the GT24/GT26you get a gas turbine eminently suited to today's market.

The GT24 and GT26 represent a uniquely successful approach to heavy-duty gas turbine technology– many of their major components and subsystems have performed outstandingly for years in anumber of applications. They can operate in a new or existing power plant design or as part of aturnkey power plant. Applications cover electrical power generation in base load, intermediate or peakduty. It can be used in industrial applications such as paper mills, district heating or desalination plants.

Right technology, right productsAlstom’s gas turbines stand out for their high cost efficiency,availability and flexibility.The range covers a wide spectrum of products, including machinesfor both the 50 Hz and 60 Hz markets. They can operate either insimple cycle or combined cycle and are fuelled by natural gas,medium or low calorific gases or light oil; with on-line fuel switchover capability eliminating dependency on any one fuel.

A gas turbinein a class of its own

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Competitive kilowatt hourIn combined-cycle applications, the GT24/GT26 is capable of net plantefficiencies of close to 60% using already proven gas turbine technology.

High reliability/availabilityLow turbine inlet temperatures, a uniform annular temperature profile,a maintenance free, welded rotor and a simple and robust EV burner allhelp to reduce maintenance needs and therefore improve availability.

High Power densityHigh power density design leads to smaller components. Comparedto Alstom's conventional gas turbines, the GT24/GT26 provide up to60% more output for the same footprint.

Operational flexibilitySequential combustion means unrivalled operational flexibility whichincludes the ability to handle wide fluctuations in gas compositions.An operating range, down to 40% part load and below while keepinglow NOx emissions, allows the plant to meet all power demands.

Clean PowerSequential combustion technology is the industry’s most innovativeplatform for clean power generation, giving gas turbines with lowemissions and high efficiency.

Long-term paybackIn combined-cycle applications, the GT24/GT26 can deliver asignificantly higher internal rate of return compared to conventionalturbine technology.

GT24/GT26 sequential combustion:the benefits

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The success of the GT24/GT26 is the result oftime-tested design principles, thorough validation andmanufacturing processes conforming to the highest standards.

Pioneering the technologyNo-one knows sequential combustion turbines better thanAlstom. Not only did we invent them, we have been designing,manufacturing and installing them for over 50 years. In fact,Alstom is the only manufacturer in the world to have chosenthe sequential combustion path, leading to high gas turbineefficiency, low emissions and wide part load operating range.Our first sequential combustion turbine went live in Switzerlandin 1948. With the advent of metallurgically superior hot-gasmaterials and advanced blade-cooling technology in the 1970s,we were able to leverage the outstanding potential of oursequential combustion technology. 1978 saw the nextgeneration, a single rotor sequential combustion gas turbine.

Maintenance-free welded rotorAlstom’s welded rotor was first introduced in 1929 for steamturbines and has been operating successfully in both Alstomgas and steam turbines. The rotor is welded from forged discs

Performance witha unique track record

that ensure high rotor stiffness with two-bearing support.The welded rotor design eliminates maintenance work such asrestacking and disk replacement during the service life of therotor. Thus there is no need for the so called “Major Overhaul”of the gas turbine where this type of work is necessary.

Highly-efficient compressorThe development of the GT24/GT26 compressor is the resultof an evolutionary process with a gradual increase in thepressure ratio to over 30 bar.The GT24 and GT26 employ controlled diffusion airfoil (CDA)blading, where each compressor stage is individually optimisedaccording to specific requirements and boundary layer conditions.This leads to higher overall compressor efficiency while retaininga high surge margin. In addition, three rows of variable guidevanes are used to optimise the operation concept at every load.

Dry low NOx EV burnerEV (EnVironmental) burner technology, operating successfullyfor millions of hours throughout the Alstom gas turbine fleet,gives long burner life, no maintenance between hot gas pathinspections and low emissions.

The highly efficient GT24/GT26 compressor - a resultof extensive experience & evolutionary development.

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The EV burner gives the benefit of dry low NOx combustionfor operation with different natural gases, with the option torun with liquid fuel as an alternative.The burner is shaped like two half-cones slightly offset laterallyto form two inlet slots of constant width running thecomponent’s full length. Combustion air enters the conethrough these slots and fuel is injected through a series of fineholes in their edges. With this arrangement, fuel and air spiralinto a vortex form and are intensively mixed.

Annular combustionTwo, fully annular combustion chambers distribute thecircumferential temperature evenly while avoiding problemzones such as cross-firing tubes or transition pieces. Inaddition the annular combustion systems of Alstom do notneed a so called "Combustor Inspection" as for can-annularsystems which reduces the amount of maintenance leadingto higher availability.

TurbineThe sequential combustion concept results in a gas turbineexhibiting extremely high power density resulting in thesmaller blade dimensions of the GT24/GT26 machines.The five rows of turbine blades are anchored in fir tree slots.Air from the compressor cools the high-pressure turbinestage and the first three low-pressure turbine stages utilisinga combination of film and convection cooling techniques.

Secondary air systemThe cooling air for the hot gas path components is taken fromfour extraction points along the compressor. Air from two ofthese secondary airflows is used directly, while the two otherstreams are cooled by heat exchangers (Once Through Coolers)before entering the hot gas path components. The heatrejected is recovered in the water-steam cycle, whichmaximises the performance of the GT24/GT26 in combinedcycle applications. In simple cycle applications, the cooling isachieved by quenching water, which is introduced directly intothe secondary air stream.

The EV burner, first applied in the GT11Nsilo combustor in 1990, has now logged

millions of operating hours.

Welded rotortechnology.

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Vortexbreakdown Flame front Gas injection holes

Combustion air

LiquidFuel

Gas

Gas


The industry has always soughtto develop a gas turbine with higherefficiency. The traditional solution is to raisethe firing temperature at the turbine inlet.

However, this has drawbacks. It will increase emissions intothe atmosphere and subject the entire gas turbine system to highertemperatures.

The likely result is more frequent maintenance and reducedavailability – defeating the initial objective. For decades conventionalwisdom has decreed that efficiency cannot be increased in any otherway.

The issue

Sequential combustion:the key to gas turbine performance

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But there is another way. By injecting fuel into two combustion systems in series,it is possible to increase output and cycle efficiency without significantly increasing theemissions at full and part load as the firing temperature in the first combustor can be keptrelatively low and the second combustor does not contribute substantially to the engine NOxemissions. This is called sequential combustion.

For more than 50 years, Alstom has been a pioneer in sequential combustion technology.Over the years, we have made major system and component innovations, introducedincrementally, with successive gas turbine models. These include our industry leadingEV burners, annular combustion design and solid welded rotor. In so doing, we havesucceeded in uncoupling emissions and efficiency through an inventive yet basic applicationof elementary thermodynamics.

The effective solution

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The thermodynamicsof cycle optimisationSequential combustion provides an alternative approach tooptimising the gas turbine cycle. The thermodynamic benefitsof this innovative cycle are illustrated by the enthalpy-entropyrelationship.

The enthalpy-entropy diagram ofthe Brayton cycle graphic representsthe thermodynamic processes(compression, combustion andexpansion) and states (temperatureand pressure) that fuel and air undergoin the gas turbine cycle.Enthalpy is a measure of the energydensity, while entropy reflects theefficiency of the compression andexpansion processes as well as heattransfer to the gas during thecombustion process.

Conventional gas turbines all operateon the same principle. The compressorincreases the pressure of the inlet airfrom ambient conditions tothe compressor discharge state.In the combustor, energy of the fuel isreleased into the combustion air,which increases its specific energy(enthalpy) and raises its temperature

T At full load, approximately half ofthe total amount of fuel is burnt in thefirst combustor, the EV combustor.

T The first expansion occurs in thesingle stage high-pressure turbine(HPT). The high pressure turbineexhaust gas enters entirely into thesecond combustor.

T The remaining fuel is introducedand burnt in the second 'reheat'combustor (the SEV combustor).

T The second expansion occurs in afour-stage low-pressure turbine(LPT). At over 600°C, the exhaustgas temperatures are ideal forcombined cycle applications.

T The GT24/GT26 achieve low NOxemission levels, not only at fullload, but also down to part loadsof 40% and below. This is due to theoperation concept that maintainsthe EV combustor temperature at anearly constant level. Further theSEV combustor produces only littleadditional NOx.

to peak level. The hot gases expandthrough the turbine, producing thework to drive the compressor and theelectric generator. To achieve morework and higher efficiency in aconventional gas turbine, turbine inlettemperature has to be increased.

wt

q

ENTHALPY-ENTROPY DIAGRAM FOR CONVENTIONAL GAS TURBINE

Specific Entropy

Spec

ificE

ntha

lpy

T

q specific heat input (fuel)wc specific work input (compressor)wt specific work output

(expansion through turbine)T gas temperature

wc

SEQUENTIAL COMBUSTION

qev specific heat input (fuel) to EV

qsev specific heat input (fuel) to SEV

wc specific work input (compressor)

whpt specific work output(high pressure turbine)

wlpt specific work output (low pressure turbine)

T gas temperature

T

qev

qsev whpt wlpt

wc

Specific Entropy

Spec

ific

Enth

alpy


1] Compressed air is fed into the EV burner, creatinga homogeneous, lean fuel/air mixture. The vortex flow, inducedby the shape of the burner, breaks down at the EV burner exitinto the combustion zone, forming a central recirculation zone.2] The mixture ignites into a single, low temperatureflame ring. The inner recirculation zone stabilises the flame infree space within the combustion zone, avoiding contact with theburner wall.3] The hot exhaust gas, low in oxygen content, exits thefirst combustor and moves through the high pressure turbinestage before entering the SEV burner.4] Vortex generators in the SEV burner enhancethe mixing process, while carrier air, injected with the fuelat the SEV fuel lance, delays spontaneous ignition untilthe mixture enters the annular SEV combustion chamber.5] Ignition occurs when the fuel reaches self-ignitiontemperature in the free space of the SEV combustor. The hotgas then continues its path into the low-pressure turbine.

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Sequential combustionhow it works

Sequential combustion breaks the linkbetween higher efficiency and higherinlet temperature. In sequentialcombustion, the process ischaracterised by splitting thecombustion process into two stages,separated by an expansion to anintermediate pressure level. In thisso-called “reheat” process, energy isadded part way through the expansionprocess, resulting in high gas turbineefficiency and high power density.The sequential combustion principlehas been successfully applied to thelarge, heavy duty, GT24 and GT26 gasturbine models. These units possessseveral important features thatdistinguish them from conventionalmachines.

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4 3


Sequential combustion can bevisualised as a gas turbine comprisingtwo combustor-turbines in series, wherethe exhaust gases from the first turbinefeed the combustor of the second.

An efficient 22-stage subsoniccompressor feeds combustion air intothe first combustor. There fuel is mixedwith the high-pressure air and burns inthe first combustor – the annular EVcombustor. The hot gases drive a firstturbine, the single-stage high-pressureturbine.

Unlike conventional turbines, fuel isnow injected into a second burner setand ignites spontaneously in thefollowing annular combustion zone, theSEV (Sequential EV) combustor,thereby reheating the air andexpanding it further through four lowpressure turbine stages.

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Its beautyis in its simplicityLike all the best ideas, sequential combustion is basedon a simple concept: the reheat principle.

EV combustionThe EV combustor has an annularburner arrangement. The GT26 is fittedwith 24 retractable EV burners, whilethe GT24 is fitted with 20 retractableEV burners. Each operates over thewhole load range. Compared to othercombustor arrangements, the annularcombustor distributes the hot gas,circumferentially, at a much moreuniform temperature.

Radial temperature uniformity isaccomplished by pre-mixing virtuallyall incoming compressor air with the fuelin the EV burner, and by the absenceof film cooling in the convection-cooledcombustor walls. This produces asingle, uniform flame ring in the freespace of the EV combustion zone.A key benefit is that the flame has nocontact with the walls of the burner.These design features distinguish theEV combustor significantly from othercombustion systems.


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SEV combustionIn the annular SEV combustor, thecombustion process is repeated asin the EV: vortex generation, fuelinjection, pre-mixing and flamestabilisation in a vortex. The SEVcombustor consists of 24 burnersdistributed in a ring, followed by anannular combustion zone surroundedby convection-cooled walls. Exhaustgas from the high-pressure turbineenters the SEV combustor through thediffuser area. Combustion temperatureuniformity in the SEV, as in the EV, isachieved by the uniform premixing offuel with air in a vortical flow withhigh mixing intensity. Each SEVburner contains four delta-shapedvortex generators on each burner wallin order to form four pairs of vorticesin the combustion air.

Fuel is then injected through an air-cooled fuel lance, distributing with fourjets into the vortex pairs such that itforms a perfect fuel/air mixture prior tocombustion. The fuel jet is surrounded bycool carrier-air that delays spontaneousignition until the fuel air mixture hasreached the combustion zone.

There, the mixture ignites spontaneouslyand, as in the EV, combustion occursin a single, stable flame ring, operatingacross its entire load range.

Neither the EV nor SEV combustorcontains any moving parts. No so called“Combustor Inspection” is needed –neither for the EV nor SEV combustor.This mechanical simplicity determinesthe high reliability and availability of theGT24/GT26 design.

Uncoupling emissionsand performanceNOx formation depends on thetemperature, pressure and residencetime in high temperature regions insidethe combustion area. In both the EVand SEV combustors, the combustiontemperatures are relatively low due tothe lean premixing of fuel with air.Due to the efficient vortex stabilisationof the flame the residence time at hightemperature is shorter than inconventional combustors. In addition,when comparing conventional andreheat gas turbines, the Brayton cycledemonstrates thermodynamically thatconventional machines need a highercombustion exit temperature to achievean equivalent specific output.

Given the importance of the relationshipbetween NOx production and flametemperature, it is also notable that thetemperature profiles in both the EV andthe SEV combustors are much moreuniform than in conventional combustors.This effectively prevents temperature

peaks and resultant NOx formation.NOx emissions for the GT24/GT26units are well below 25 vppm, thisacross a wide load range.The design of the SEV combustorprovides additional advantages. In theSEV burner, where incoming hot gashas a considerably lower O2 contentthan normal air, less oxygen is availablefor NOx formation.

Furthermore, because the SEVincoming air is at a considerablyhigher temperature than conventionalcombustion air, it requires less heatingto reach flame temperature. Both ofthese NOx mitigating phenomenaare known from other combustiontechnologies that employ exhaust gasrecirculation.

Although a large amount of the total unitfuel is burned in the SEV combustor,there is very little additional NOx (at15% O2) formed in the SEV combustor,mainly due to the low oxygen contentof the incoming air.

SEV burner showingdelta-shaped wings.


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Power TrainArrangmentsAlstom has extensive experiencewith both single and multi shaftpower train arrangments, in alltypes of operating regimes frombase load to daily start and stop.

Steam TurbineAlstom steam turbines offer:T HP turbine shrink ring design for sustained efficiency and fast start-upT welded rotor design for fast start-up and low maintenaceT single bearing designs for compact arrangementT single lateral exhaust designs also available for lower foundations and

lower first costs.

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Heat Recovery SteamGenerator (HRSG)

Alstom's range of HRSGs provide:T drum type of once-through technologyT optimised hot and cold end

performance for maximised combinedcycle efficiency

T high thermal flexibility for fast start upT highly modularised design for fast site

erection

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Gas TurbineAlstom gas turbines - the core of anycombined cycle plant.

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Kaeng Khoi 2, Thailand.

The Alstom Power Train

TOPGAST for higher output levels,

primarily in GT26 singleshaft arrangements

T maximum efficiency throughhydrogen cooling

T efficient seals for low hydrogenconsumption levels

T self retightening stator endwindings for low maintenance.

TurbogeneratorAlstom turbogenerators demonstratehigh efficiency, reliability and availabilitywith low maintenance requirements.According to plant size andarrangement, both TOPAIR andTOPGAS generators are available.

TOPAIRT multi-chamber Totally Enclosed

Water to Air Cooled (TEWAC)system for high efficiency

T self retightening stator end windingsfor low maintenance

T proven relaibility in variousapplications and shaft arrangements.

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2 3

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Shoreham / UKA GT26 merchant power plantapplicationScottish Power Ltd selected the KA26-1standard single-shaft design to build acombined-cycle power plant at ShorehamHarbour in the United Kingdom. Theplant was completed in December 2000and is managed on a merchant plantbasis. It has operated at both base loadand intermediate duties.

Cartagena / SPAINA GT26 fast-track project in SpainThe Cartagena project, a 1200 MWcombined-cycle power plant consistingof three independent blocks equippedwith dual-fuel GT26 gas turbines, wasawarded to Alstom in December 2003with a very aggressive timetable. Thefirst unit was finished within 25 months,with the other units following at one-month interval. This is a repeat orderfor Gas Natural, which already ownsand operates two other GT26combined-cycle power plants in Spain.

Island Cogen / CANADAA GT24 in cogeneration applicationIsland Cogen is a 250 MW gas-firedcombined-cycle cogeneration powerplant at Campbell River in BritishColumbia, Canada. The plant is ownedby Calpine and delivers steam to anadjacent paper mill.

Taranaki / NEW ZEALANDThe first GT26 single–shaft power plantContact Energy in New Zealandis the owner of an Alstom turnkey360 MW combined-cycle power plant,featuring the GT26 sequentialcombustion gas turbine.Taranaki is arranged in a single-shaftconfiguration and represents the firststandardised reference plant solutionwith the GT26. This triple pressurereheat combined-cycle plant has beenin continuous base load operationsince July 1998.

Gilbert / USAThe first ever GT24/GT26 engineThe first GT24 ever to go into operationwas installed in the simple-cycle powerplant at Gilbert Station, on the DelawareRiver in New Jersey. The addition of theGT24 simple cycle, coupled with theretirement of two older steam units,resulted in a net increase of 96 MW,with higher efficiency and lower emissions.The unit is owned by Reliant Energy.

Midlothian / USAOne of the largest GT24 combined cyclepower plantsInternational Power, formerly asubsidiary of Britain‘s National PowerPLC, selected Alstom to build a largegas-fired combined-cycle power plantdesigned around six GT24 single-shaftpower trains. Midlothian is one of thelargest combined-cycle merchant powerplant facilities in the US.

Sequentialcombustion

in actionCartagena, Spain.


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Sequential combustion applicationsCombined-cycleA combined-cycle power plant is anefficient and environmentally sound wayto generate electrical power. The reheatprocess in sequential combustionprovides optimum exhaust temperaturesfor combined-cycle use. This is the mainapplication for which the GT24 andGT26 have been developed for.

The two combustors in the GT24/GT26sustain high efficiency and low emissionsat part load operation through controlof the inlet air flow by three rows ofvariable guide vanes. The vanesreduce air mass flow to 60% of the fullload level while maintaining theexhaust temperature of the gas turbineat nominal level. This ensures that the

thermodynamic quality of the sequentialcombustion combined-cycle remainsnearly constant, maintaining its high livesteam temperatures. As a result,GT24/GT26 combined cycle efficiency at50% load, for example, is approximately12% better than a conventional class gasturbine combined-cycle power plant.

This maximises the long-term valueof GT24/GT26 power plants bysignificantly broadening their operatingflexibility – a key success factor fortoday’s competitive power generationmarket.

Single-shaft solutionsThe single-shaft combined-cyclesystem consists of one gas turbine, onesteam turbine, and one heat recoverysteam generator (HRSG), with the gasturbine and steam turbine coupled toeither side of a single turbogeneratorto form a single shaft line.

The key advantage of the single-shaftarrangement is its operating simplicity,which raises reliability – as much as 1%above multi-shaft blocks. Operationalflexibility comes from the fact that asteam turbine can be disconnected,using a self-synchronizing clutch, duringstart-up or for simple cycle operation ofthe gas turbine.

In terms of overall investment, theinitial cost of the single-shaft is lowerthan the multi-shaft arrangement.Single-shaft plants achieve savings inboth power-island and balance of plantcosts. Power-island costs are saved byreducing electrical equipment: only onegenerator, one bus duct and one step-up transformer are required. Balanceof plant savings come from lower civiland structural costs due to a compactarrangement compared to multi-shaftlayouts.

Langage combinedcycle power plant

in Devon, UK.

Sectional viewof Cartagena

power plant, Spain.


Multi-shaft solutionsThe multi-shaft combined-cyclesystem consists typically of two ormore gas turbines, each with its owndedicated turbogenerator and HRSGfeeding steam to a single steam turbinealso with its own turbogenerator.

The key advantage of the multi-shaftarrangement is higher overall plantoutput and efficiency due to thelarger steam turbine and optimisedwater-steam cycle.

This advantage is maintained downto about 50% plant load. Below thisfigure, the efficiency of two single-shaftpower trains is better, as one shaft linecan be shut down.

CCPP LOAD [%]

Relative CC Gross Efficiency

4080%

85%

95%

100%

50 60 70 80 90 100

90%91%

94%

87,5%

SUPERIOR PART LOAD PERFORMANCE

Relative KA26 Efficiency vs CC Load

Gas Turbine

HRSG

WaterStorage

FeedwaterBoiler

SteamTurbine

Condenser

CondenserPreheating

MainBoilerG G

GT POWER PLANT EXISTING CONVENTIONAL ST POWER PLANT

S

Repowering withsequential combustiongas turbinesAlstom has developed a hybrid plantconcept combining conventional steamplants with the GT24/GT26.

This concept responds to the mostcritical requirements of modernpower generation systems – lowgenerating cost, fuel mix capabilities,operational flexibility and minimumenvironmental impact. The conceptexhibits extraordinary design flexibilityby integrating high performancesequential combustion gas turbinetechnology with a wide rangeof existing or new conventionalsteam power plants.

These plants combine an operating anddispatching flexibility with continuousfuel optimisation, low O&M costs andmoderate capital investment.

Typical part load efficiencyof a GT24/GT26 basedcombined cycle power plant.

The hybrid plant concept, combiningconventional steam and gas turbine powerplants, provides the advantages of lowestgeneration cost, fuel mix capabilities andminimum environmental impact.

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POWER SERVICE PORTFOLIO

Full operation O&M

General/daily maintenance o&M

Operation & maintenance support Risk mitigationby dedicatedOEM

Operation &MaintenanceContracts

ServiceAgreements(LTSA)

PurchaseOrders

Optimization of costs and performance

o&m

Planned & unplanned maintenance m

Planned outages Support & Consulting

Field Services

Parts

Purchase Order

Alstom offers extensive service experience in powergeneration. It has a complete range of services fromtraditional spare parts supply and field service specialists tothe full operation and maintenance of gas turbine andcombined-cycle power plants. As the Original EquipmentManufacturer (OEM) we are ideally placed to providecontinuous plant improvement packages, e.g. performanceupgrades, lifetime extensions or emission reduction packagesto meet changing market requirements during a plant’soperational lifetime.With over 100 years experience and an installed fleet of morethan 650 GW, Alstom’s 200 Local Service Centers (LSCs),located in 70 countries, are there to provide local facilitiesand expertise directly to our customers, keeping your plantcompetitive.

Long-term service contractsAlstom’s long-term service contracts are flexible in scope ofservices and equipment covered as well as contract durationin order to meet your unique business requirements. Theirmodular scope allows tailor made packages to be assembledbased on the level of risk mitigation and guarantees required,enabling you to choose the correct contract model that fitsyour strategy in terms of operating and maintaining yourpower generation assets. With traditional purchase ordercontracts, customers can purchase spare parts according totheir needs. Service agreements can add guaranteedavailability and fixed prices for parts, services and consulting.With our Operations and Maintenance contracts, customerscan have Alstom employees operating and / or maintainingtheir plants.

Our experience covers over 30 plants and 45 gas turbines ofthe GT24/GT26 type with long term service contracts. Suchcontracts with the OEM benefit from the extensive first-handexperience gained from site operations and make full useof the knowledge gained from the complete installed fleet.

With our service contracts, our partners obtain significantlymore value to ensure key requirements (depending uponscope of supply) are met:

T Predictable operation & maintenance costsT Reliability and availabilityT Heat rate and power outputT Environmentally sound productsT 24 hour / 7 day plant supportT Broad OEM experience

Service during operation


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Plant Support CentreAlstom’s Plant Support Centre (PSC)located in Baden, Switzerland, offersremote, fast and comprehensivetechnical support for the whole powerplant around the clock. In addition totrouble shooting, the PSC provides datamonitoring services including earlywarnings and Monitoring & DiagnosticReports, assessment of healthparameters and consulting regardingperformance and RAM (reliability,availability, maintainability)optimization. The PSC reducesoperational risks through its focus onpro-active monitoring, which providesearly warning of emerging equipmentproblems through advanced diagnosticprograms.

Plant Integrator™ –creating customer valuePlant Integrator™ is Alstom's solution methodology designedto create added value for customers. Plant Integrator™’sstarting point is the customers’ viewpoint. It thensystematically analyses, measures and optimises the specificcustomer benefits desired, technically, economically andecologically. As a result, Plant Integrator™ matches customerneeds and priorities with products and services, delivering athoroughly tailored solution and maximising customer value.This then becomes the benchmark for future fine-tuning andupgrades.

The unrivalled Plant Integrator™ offering from Alstom coversthe full palette, from single component packages and controlsystems to power islands and complete plants, operation andmaintenance services, as well as retrofit solutions.

Plant Integrator™ benefits to customers:T Improve cash flow – by achieving lowest costsT Generate more powerT Increase installation efficiencyT Burn less fuelT Improve operational flexibility


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Alstom Power R&D

We aim for the best utilisation of the Customers’investment, the earth’s materials and the fuel used, throughefficiency, availability and cost reduction. The increasedenvironmental concern means that we place a focus onminimising CO2 emissions through the development ofmitigation and renewable technologies for application innew and retrofit installations.The engineering and R&D workforce totals 5,500 people,of which 4,000 are in engineering and 1,500 in R&D in22 R&D centres. There are 13 laboratories with dedicatedinfrastructure, equipment and testing facilitities.Alstom Power R&D policy takes a global approach which hasseveral benefits. First, it puts the work where the expertise islocated. Secondly, it helps to nurture close contacts withuniversities and design institutes that can complement ourin-house efforts. Thirdly, it enables us to stay in touch withglobal customers' expectations, anticipate their needs andlead the technology trends.Alstom Power works with more than 30 universities worldwide.We establish close, long-term links with institutions andprofessors who are experts in fields which are important tous, for example, with MIT and Stanford Research Institute onCO2, Grenoble and Lausanne universities on hydro turbines,Cologne's DLR on combustion, Oxford University on heattransfer as well as with engineering institutes in China, Indiaand Russia.

In the field of international collaboration, Alstom Power hasplayed a leading role in establishing the European technologyplatform for zero emission fossil fuel power generation (ZEP).

The Gas Turbine Test Power PlantThe Gas Turbine Test Power Plant located in Birr,Switzerland, provides a unique environment for maintainingAlstom’s competitive advantage through productimprovement, all within the proximity of Alstom's R&Dfacility, the gas turbine development department and themanufacturing facility. The facility is equipped with a dual fuelGT26 and a dual fuel GT8C2 gas turbine, both operating insimple cycle mode dispatching to the Swiss electrical grid.As it is an Alstom facility, there are no restrictions on testing(loads, limits or duration) which can be done under realconditions without any commercial time constraints.

The shortened feedback loop (in terms of time and distance)of field experience helps in speeding up design validationand implementation in Alstom's gas turbine fleet. The GasTurbine Test Power Plant, in combination with the ProductSupport organization and the GT development departmentputs Alstom in a position to insure seamless implementationof evolutionary product improvements based on theGT24/GT26 fleet experience.

Alstom Power R&D is decidedly market and customer orientedand focuses on creating innovative technologies to apply at allstages of our products’ life cycles.

GT26 and GT8C2 Test Power Plantat the rotor factory in Birr, Switzerland.


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A world leader inclean power generation

Alstom is a global leader in the world of powergeneration and sets the benchmark for innovative andenvironmentally friendly technologies.

The company designs, manufactures and delivers state-of-the-art products and systems to the power generation(gas, coal, and hydro power plants) and industrial markets.In addition, Alstom provides the conventional equipmentfor nuclear power plants.

Our objective is to build the cleanest integrated powersolutions for our customers. We supply and integrate allcomponents of a clean power system, from boilers to airquality control and energy recovery systems. We also haveextensive experience in retrofitting, upgrading andmodernising existing power plant equipment. We can alsoboast unrivalled expertise in project management for all typesand sizes of power generation systems – small to large aswell as single equipment to complete turnkey solutions.

Alstom‘s unique offering brings real value to our customers.With our innovative plant integration concept, we helpoperators to maximise their plant performance, while fullycomplying with environmental regulations and obligations.

Expertise in clean power solutionsPlant operators today face multiple challenges in their effortsto make their plants more competitive, while complying withthe different environmental regulations.

Alstom is delivering clean power solutions now. As theuncontested leader in clean power generation technologies,we provide the cleanest integrated power solutions on themarket. They cover all plants (both existing and new ones),all energy sources (from fossil fuels to hydro and nuclear),and all emissions (NOx, SOx, Mercury, particulate matter).

Alstom offers the complete range of products designed tohelp power plants to either reduce pollutant and CO2

emissions, or to produce clean electricity from the outset.

For example, we deliver new coal-fired power plants with anadvanced supercritical design using proven clean combustionsolutions that are integrated with state-of-the-art emissioncontrols. Similarly, we improve the thermal andenvironmental efficiency of existing power plants byretrofitting plant components or upgrading the whole system.The GT24 and GT26 sequential combustion gas turbines areprime examples of Alstom’s ability to curtail emissions anddeliver cleaner power.

Investing in the future of clean powerAlstom is uniquely placed as a plant integrator and full-serviceprovider to design and manufacture all the components of aclean power plant, from turbines such as the GT24/GT26 togenerators, boilers and air quality control systems.

Alstom also invests substantially in the research anddevelopment of new environmentally friendly power solutions.Together with partners, universities and customers in Europeand the United States, we are working on collaborativeprojects to develop solutions for pre and post-combustionCO2 capture and oxy-firing.

A world leaderAlstom supplies major equipment for 25% ofthe world‘s installed base, making us:N°1 in turnkey power plantsN°1 in air quality control systemsN°1 in hydro turbines and generatorsN°1 in the number of installed boilers

worldwideN°1 in installed turbines and generators

for nuclear power plantsN°1 in steam turbine retrofit and integrated

retrofit projects


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Alstom (Switzerland) LtdBrown-Boveri Strasse 7CH-5401 BadenSwitzerlandPhone +41 56 205 70 58Fax +41 56 205 28 88

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GT24 and GT26 Gas Turbines - Clean, high performance,...

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Transcript of GT24 and GT26 Gas Turbines - Clean, high performance,...