GT24/GT26 Gas turbines

Our world has an ever-growing appetite for energy – balanced by an increasing concern for the environment. Alstom delivers the clean power solutions that utilities and industries need to meet these increasing challenges.

From gas turbines or entire turnkey power plants and to industrial solutions, our versatile technology is proven to lower generation costs, reduce emissions, and provide unmatched operational reliability and flexibility.

Through more than 70 years of innovation, alstom has established a track record of quality, safety, and responsiveness to local market needs. Clean power for a changing world!

Key facts

90 locations

200 turnkey power plants

1,500 gas turbine professionals worldwide

70 years of innovation

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Power producers around the world are constantly striving to save fuel, reduce operating costs and deliver reliable, cleaner power. Alstom’s high performing advanced class GT24/GT26 gas turbines deliver the high efficiency, exceptional availability and lower environmental impact they need to meet these challenging requirements – and have been proven through Alstom’s decades of operating experience.

Alstom’s GT24/GT26 advanced class gas turbines are exceptionally well suited to deliver against increasing energy challenges, with demonstrated superior operating versatility, and a track record of providing maximum returns for customers. As one of the most reliable gas turbine solutions on the market – with more than 5 million fired hours and 87,000 starts – the Alstom gas turbines GT24 (for 60 Hz applications) and GT26 (for 50 Hz) offer proven performance and flexibility.

The GT24/GT26 turbines reduce emissions by delivering high efficiency at conventional firing temperatures. This is made possible by an advanced design featuring annular combustors, welded rotors and Alstom’s unique sequential combustion technology.

These advanced class gas turbines are the industry’s most versatile when it comes to handling wide fluctuations in fuel composition. They are equally versatile in operating modes, with the ability to switch between modes while online, allowing power providers to optimise for performance or maintenance costs to meet individual requirements.

GT24/GT26 gas turbines Unparalleled performance, maximum return

alstom GT24/GT26 deliver the versatility and performance needed to meet dynamically changing power requirements.

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REDUCING

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Our Power generation offering is based on a deep understanding of power markets and our customers’ needs. It is organised around three levers to maximise the return of assets over their entire lifecycle.

How Alstom is helping you meet the challenges of energy sustainability Clean Power, Clear Solutions

EnErgy sustaInabIlIty: a glObal challEngE

people globally lack electricity.1 in 5

of renewable energies in global electricity generation.

Only 20%rise of the global energy-related carbon dioxide emissions could happen by 2035.

A 20%

REDUCING COST OF ELECTRICITY

It takes competitive assets to keep electricity affordable. We enable power companies to compete successfully in the marketplace and provide affordable electricity to consumers. We help you reduce the cost of electricity through:

•Efficiencyimprovements•CAPEX reduction / scaling up•Capacity Factor increase (renewable)•Lead time reduction•Competitive O&M•Competitivefinancing

LOWERINGENVIRONMENTAL FOOTPRINT

Clean generation is one way of demonstrating environmental responsibility. Another is lowering resource usage, visual impact and noise pollution. In both cases, we can help you meet or exceed regulations and environmental standards. That is why Alstom innovates in the following areas:

•Renewable portfolio•Natural resource optimisation•Pollutants control

(SOx, NOx, PM, mercury)•CO2 emission reduction & CCS•Land use, visual impact and noise•Water intensity reduction &

recyclability

INCREASINGFLEXIBILITY & RELIABILITY

Intermittent power generation is a growing challenge of energy security, as is maintaining an aging installed base and adapting it to changing market conditions. We help you tackle both issues so that you can enjoy dependable operations with:

•Maintainability and outage time reduction•Operationalandfuelflexibility•Lifetime extension and power uplift•Designs and service for improved

availability and reliability•Climate packages•Energy storage

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ENERGY SECURITY

COMPET IT IV E A S S E T SAFFORDABLE ELECTRICITY

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& RELIABILITY

FLEXIBILITY

INCREASING

Our Power generation offering is based on a deep understanding of power markets and our customers’ needs. It is organised around three levers to maximise the return of assets over their entire lifecycle.

How Alstom is helping you meet the challenges of energy sustainability Clean Power, Clear Solutions

EnErgy sustaInabIlIty: a glObal challEngE

people globally lack electricity.1 in 5

of renewable energies in global electricity generation.

Only 20%rise of the global energy-related carbon dioxide emissions could happen by 2035.

A 20%

REDUCING COST OF ELECTRICITY

It takes competitive assets to keep electricity affordable. We enable power companies to compete successfully in the marketplace and provide affordable electricity to consumers. We help you reduce the cost of electricity through:

•Efficiencyimprovements•CAPEX reduction / scaling up•Capacity Factor increase (renewable)•Lead time reduction•Competitive O&M•Competitivefinancing

LOWERINGENVIRONMENTAL FOOTPRINT

Clean generation is one way of demonstrating environmental responsibility. Another is lowering resource usage, visual impact and noise pollution. In both cases, we can help you meet or exceed regulations and environmental standards. That is why Alstom innovates in the following areas:

•Renewable portfolio•Natural resource optimisation•Pollutants control

(SOx, NOx, PM, mercury)•CO2 emission reduction & CCS•Land use, visual impact and noise•Water intensity reduction &

recyclability

INCREASINGFLEXIBILITY & RELIABILITY

Intermittent power generation is a growing challenge of energy security, as is maintaining an aging installed base and adapting it to changing market conditions. We help you tackle both issues so that you can enjoy dependable operations with:

•Maintainability and outage time reduction•Operationalandfuelflexibility•Lifetime extension and power uplift•Designs and service for improved

availability and reliability•Climate packages•Energy storage

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High efficiency, proven availability, lower environmental impactGT24/GT26

Key benefitsAlstom’s high preforming advanced class gas turbines have demonstrated superior versatility worldwide, providing maximum returns to customers.

Operational versatilityThe GT24/GT26 gives power providers unmatched operational versatility, with the unique ability to switch online between two operational modes – Performance Optimisation for higher output and efficiency or Maintenance Cost Optimisation for up to 30% longer operational intervals between scheduled inspections. This versatility allows customers to weigh performance against plant maintenance costs as power demand shifts.

Gas fuel flexibilityAlstom’s innovative and robust sequential combustion design offers the best in industry versatility to support a wide range of gas variations, including Liquefied Natural Gas (LNG).

Fuel oil capabilityTo allow power producers the flexibility to react to demands of the grid or fuel supply, the GT24/GT26 offer the capability of burning fuel oil in the event of a fuel gas supply shortage, managing the switchover without power interruption.

High availabilityAlstom GT24/GT26 gas turbines have posted availability, reliability and service factor performance that meet or exceed class averages, proven over more than 5 million operating hours.

Load range efficiencyAlstom GT24/GT26 gas turbines offer best in class all-round efficiency at nearly constant levels from 100% to 80% load and high efficiency below 80% load.

Low emissionsThe GT24/GT26 turbines produce NOx emission well below 15 vppm at 15% O2, and can deliver these low emissions at low part loads as well.

Start-up times, ramp ratesAlstom advanced class gas turbines offer industry standard 30-minute hot start-up and non-spinning reserve capability delivering 500 MW in just 10 minutes for a KA24-2 configuration respectively 350 MW for a KA26-1 configuration.

Superior hot / cold performanceThe GT24/GT26 can operate in ambient temperatures as high as 55°C and as low as -30°C to meet a diverse range of operating environments.

the alstom Gt24/Gt26 offer the ultimate in versatility, performance and emission reduction to meet today’s dynamic energy needs.

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High efficiency, proven availability, lower environmental impactGT24/GT26

A smart idea, powerfully delivered

Alstom technology – a superior solutionFor more than 50 years, Alstom has been developing and perfecting an alternative design, and has been the first to introduce sequential combustion technology.

By injecting fuel into two combustion systems in series, it is possible to increase output and cycle efficiency without significantly increasing the emissions at full and part load, since the firing temperature in the first combustor can be kept relatively low, and the second combustor does not make a substantial contribution to the level of engine NOx emissions.

As a result of these innovations, Alstom has enabled power providers to deliver more cost-effective, reliable energy with lower environmental impact.

In addition, the GT24/GT26 gas turbines feature•Industry-leading annular EV burners that create a contactless

flame, detached from the hardware, reducing maintenance• Compressors and LP-turbines that feature high-efficiency 3D

blade profiles for high all-round performance• Multiple variable guide vanes for better turn down capabilities •Solid welded rotor that reduces maintenance time and

improves availability

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Sequential combustion design comprises two combustor-turbines in series, where the exhaust gases from the first turbine feed the combustor of the second. an efficient 22-stage subsonic compressor feeds combustion air into the first combustor. Fuel is mixed with the high-pressure air and burns in the first combustor — the annular eV combustor. the hot gases drive the single-stage high-pressure turbine.

unlike conventional turbines, fuel is then injected into a second burner set and spontaneously ignites in the following annular combustion zone, the seV (sequential eV) combustor, thereby reheating the air and further expanding it through four low-pressure turbine stages. the temperature of the eV combustor is maintained at a nearly constant level, resulting in lower nOx emissions – and cleaner power.

Vortexbreakdown

Sprayevaporation

Combustion air

LeanPremix Gas

RichPremix Gas

Premix Gas

Lean Premix Gasinjection holes

Ignition Flame front

Industry-leading burners

1st-stage EV combustorThe EV combustor has an annular burner arrangement.The GT24/GT26 gas turbines are fitted with retractable EV burners. Compared with other combustor arrangements, the annular combustor distributes the hot gas, circumferentially, at a much more uniform temperature.

Radial temperature uniformity is accomplished by pre-mixing compressor air with the fuel in the EV burner, and by the absence of film cooling in the convection-cooled combustor walls. This produces a single, uniform flame ring in the free space of the EV combustion zone.

A key benefit is that the flame has no contact with the walls of the burner. These design features distinguish the EV combustor significantly from other combustion systems.

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improved performance begins at the coreSequential combustion

2nd-stage SEV combustorIn the annular SEV combustor, the combustion process is repeated. The SEV combustor contains SEV burners distributed in a ring, followed by an annular combustion zone surrounded by convection cooled walls.

Exhaust gas from the high-pressure turbine enters the SEV combustor through the diffuser area. Combustion temperature uniformity in the SEV, as in the EV, is achieved by the uniform premixing of fuel with air in a swirling flow with high mixing intensity. Each SEV burner contains four delta-shaped vortex generators on each burner wall in order to form four pairs of vortices in the combustion air.

Fuel is then injected through an air-cooled fuel lance, distributed with four jets into the vortex pairs such that it forms a perfect fuel / air mixture prior to combustion. The fuel jet is surrounded

by cool carrier-air that delays spontaneous ignition until the fuel / air mixture has reached the combustion zone. Here, the mixture ignites spontaneously and, as in the EV combustion, occurs in a single, stable flame ring. The EV and SEV do not require any parts replacement prior to the replacement of other hot gas components. This mechanical simplicity determines the high reliability and availability of the GT24/GT26 design.

A unique design that delivers higher performance and lower emissions across the entire load range to meet customer needs.

2nd-stage SEV combustor

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improved performance begins at the coreSequential combustion

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A proven history of performance and versatility

The versatility engineered into the GT24/GT26 gas turbines is a direct result of Alstom’s long history of innovation and experience meeting changing market demands. Alstom is a pioneer in operational flexibility and leads the industry in turn-down capabilities with the ‘low load concept’, which means that the plant can be parked at 11% (GT24) and 20% (GT26) combined-cycle load during periods of low demand with all components fully online.

Efficiency of the plant stays virtually constant from 100% down to 80% load and can operate at low load operation point with low NOx emissions to meet today’s increasing need for flexible and environmentally friendly gas power solutions.

This gas turbine technology has been proven by over 15 years operating experience with more than 5 million operating hours and more than 87,000 starts across a fleet of more than 141 units worldwide.

Balancing cost and performanceIn addition to load range flexibility, Alstom’s gas turbines deliver the unique ability to switch online between two operational modes – Power Optimisation for higher performance or Maintenance Cost Optimisation for up to 30% more operation time between scheduled inspections.

By improving availability and lowering scheduled maintenance costs, this unique benefit offers power providers unmatched ability to balance changing power needs with cost efficiency.

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Innovative technology for today and tomorrowPioneer in its class

Combining leading technology and practical design to meet changing power demands

Commitment to innovationAlstom’s unwavering commitment to innovation is backed by the nearly 1,500 gas power plant engineering, research and development professionals in nearly 90 countries.

Alstom also maintains working relationships with more than 30 universities around the world, including Oxford, Massachusetts Institute of Technology (MIT), Lausanne and engineering institutes in China, India and Russia.

This demonstrated commitment enables Alstom to deliver products featuring leading edge design, unmatched performance and versatility, and a complete set of services that enhance plant performance, reduce life-cycle costs, and minimise environmental impact.

The Alstom Power PlantCustomers benefit from Alstom’s real-world validation and development facility in Birr, Switzerland.

This working gas power plant, which is connected to the Swiss power grid, gives Alstom the opportunity to validate technologies and components in a working environment, under real service conditions. The result is an assurance that customers receive the highest quality, most innovative, versatile and reliable products proven in real-world conditions.

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Innovative technology for today and tomorrowresearch and Development

alstom Gt24 and Gt26 deliver the right technology, the right performance and the right versatility to meet diverse and rapidly changing clean power needs around the world.

Power train arrangements Alstom has extensive experience with both single and multi-shaft power train arrangements, in all types of operating regimes from base load to daily start and stop.

1 Steam turbineAlstom steam turbines offer•HP turbine shrink-ring design for sustained efficiency and

welded rotor design for fast start-up and low maintenance•Single-bearing design for compact arrangement•Single axial and lateral-exhaust designs also available for

lower foundations and lower first costs

2 TurbogeneratorAlstom turbogenerators demonstrate high efficiency, reliability and availability with low maintenance requirements. According to plant size and arrangement, both air-cooled TOPAIR and hydrogen-cooled TOPGAS generators are available.

3 Gas turbineAlstom gas turbines – the core of any combined-cycle plant

4 Heat Recovery Steam Generator (HRSG)Alstom’s range of HRSGs provides•Both drum type and once-through technology•Optimised cold-end Performance for maximised combined-cycle efficiency•High thermal flexibility for fast start-up•Highly modularised design for fast site erection

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alstom engineers have optimised our power trains for both hot and cold end performance, creating maximum combined-cycle efficiency and versatility.

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seamless integrationThe Alstom power train

1 Compressed air Compressed air is fed into the EV burner, creating a homogeneous, lean fuel /air mixture. The vortex flow, induced by the shape of the burner, breaks down at the EV burner exit into the combustion zone, forming a central recirculation zone.

2 Mixture The mixture ignites to form a single, low-temperature flame ring. The inner recirculation zone stabilises the flame in the free space within the combustion zone, avoiding contact with the burner wall.

3 Hot exhaust gas The hot exhaust gas low in oxygen content, exits the first combustor and moves through the high-pressure turbine stage before entering the SEV burner.

4 Vortex generators Vortex generators in the SEV burner enhance the mixing process, while carrier air, injected with the fuel at the SEV fuel lance, delays spontaneous ignition until the mixture enters the annular SEV combustion chamber.

5 Ignition Ignition occurs when the fuel reaches self-ignition temperature in the free space of the SEV combustor. The hot gas then continues its path into the low-pressure turbine.

The process at a glance

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Optimised designinnovative approach, powerful advantages

Combined-cycleA combined-cycle power plant is an efficient and environmentally sound way to generate electrical power. Alstom’s GT24 and GT26, with their sequential combustion design, provide optimum exhaust temperatures for combined-cycle use.

The two combustors in the GT24/GT26 sustain high efficiency and low emissions at part-load operation through control of the inlet air flow by four rows of variable guide vanes.

By maintaining a nearly constant thermodynamic quality of the sequential combustion combined-cycle, the GT24/GT26 combined-cycle offers high efficiency over the operational load range, with virtually constant efficiency between 100% and 80% combined-cycle power plant load.

This maximises the long-term value of GT24/GT26 power plants by significantly broadening their operating flexibility – a key success factor for today’s competitive power generation market.

Repowering with sequential combustion gas turbinesTo respond to the most critical requirements of modern power generation systems – low generating costs, greater fuel mix capabilities, operational flexibility and minimum environmental impact, Alstom has developed a hybrid plant concept combining conventional steam plants with the GT24/GT26. These plants combine operating and dispatching flexibility with continuous fuel optimisation, low O&M costs and moderate capital investment.

The concept also enables extraordinary design flexibility by integrating high performance sequential combustion gas turbine technology with a wide range of existing or new conventional steam power plants.

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Sequential combustionapplications

CARRINGTON (UK)Providing equipment and servicealstom’s ability to provide both equipment and plant services is demonstrated in the new Carrington Power gas-fired power station, near Manchester. alstom will supply 2 Gt26 gas turbines and other key components, and has been awarded a 16-year service agreement to maintain the equipment once the plant in operation.

the plant is scheduled for completion in 2016 and will be capable of supplying power to about a million homes.

FUJAIRAH 2 (UNITED ARAB EMIRATES)Co-generation for desalinationin 2007 alstom was awarded a full turnkey ePC contract for the largest newly constructed independent water and power project in the uae.

based on the Gt26 gas turbine, this 2,000 MW and 130 MiGD* hybrid desalination plant used multi-effect reverse osmosis technologies to become one of the best performing power plants in the world – proving highly efficient in minimising both gas consumption and CO2 emissions.

NORTH BANGKOK (THAIlAND)First use of upgraded GT26 turbineFirst use of upgraded Gt26 turbine. in consortium with sumitomo Corporation of Japan, alstom will build the 850 MW combined-cycle block 2 power. the power plant will contribute to eGat’s plans to increase thailand’s capacity by 55,000 MW by 2030, whilst minimising carbon dioxide emissions.

the plant will be the first power plant in the world to feature alstom’s upgraded Gt26 gas turbine, which offers greater operational flexibility, reliability and availability, resulting in improved efficiency with lower emissions.

lAKE ROAD, CONNECTICUT (USA)792 MW combined-cycle generating facility based on 3 GT24 gas turbinesthe units have exhibited good starting reliability and high availabilities during operation. the combined-cycle generating facility features dual fuel flexibility that utilises natural gas as the primary combustion source and distillate fuel oil as a backup.

the plant entered commercial operations in May 2002.

El SAUZ (MEXICO)Efficiency increase by 20%alstom won a contract with spain’s aCs Group to provide a new Gt24 gas turbine to replace the existing gas turbines and to retrofit the steam turbine at the existing el sauz gas-fired power plant, which has been operating since then in Queretaro, one of Mexico’s most industrialised states.

this new contract will add 25 years to el sauz combined-cycle power plant and boost its efficiency by 20%.

TARANAKI (NEW ZEAlAND)The first GT26 single-shaft power plantContact energy in new Zealand is the owner of an alstom turnkey 360 MW combined-cycle power plant, featuring the Gt26 sequential combustion gas turbine.taranaki is arranged in a single-shaft configuration and represents the first standardised reference plant solution with the Gt26. this triple-pressure reheat combined-cycle plant has been in continuous base load operation since July 1998.

Proven with more than 140 units, more than 5 million fired hours and 87,000 starts.

* MIGD = Million Imperial Gallons per Day

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Delivering profit worldwide

Partnership throughout theplant’s lifecycle

In-depth service portfolio combined with broad experienceIn today’s power generation and industrial markets, plant owners and operators seek to establish long-term cooperation with major Original Equipment Manufacturers. They look for partners who are willing and able to develop flexible solutions that will increase production efficiency and reduce emissions throughout the lifetime of their equipment.

As part of Alstom’s commitment to providing complete plant services for optimal performance, we are dedicated to supporting you to cost-effectively maintain your gas turbine and combined-cycle (GT/CC) power plants.

Our flexible and customised expert services cover solutions at all stages of the plant lifecycle or if requested simply on single components including:•Parts•Reconditioning & repairs•Technical expertise & operational support•Field service•Performance improvements•Service contracts•Services on other OEM gas turbines

Service contractsAlstom’s service contracts are tailored to meet all your operational, maintenance and support requirements. Whether you prefer a Long Term Agreement (LTA) or an Operation & Maintenance (O&M) contract, with Alstom’s comprehensive, yet flexible agreements, you can be sure of a win-win situation.

Partnerships for performanceLong-term agreements are based on framework contracts that define prices and conditions in advance. Besides offering preferential conditions for high quality parts and services, the LTA reduces administrative efforts and simplifies planning. The scope of services and equipment covered, as well as the contract duration and risk sharing, can be adapted perfectly to your needs.

lTAs offer many immediate advantages:•Fixed preferential prices for parts and services•Flexible scope to suit operative strategy•Extendable scope to include almost any aspect of plant

operations Alstom’s operation and maintenance contracts let plant owners devise completely new management strategies by outsourcing risks and responsibilities.

Alstom’s O&M contracts are fee-based agreements that:•Mitigate risks•Leverage Alstom’s extensive experience in

plant asset management•Can be adapted to suit your business strategy

Plant Support Center™ – Expert support around-the-clockAlstom’s Plant Support Center™ (PSC) offers fast and comprehensive technical support solutions to keep plants competitive. Besides remote monitoring and diagnostic services, the PSC provides 24/7 operation support and direct access to a global network of technical experts who assist in troubleshooting, assessment and re-commissioning and analyse equipment trends.

Besides practical experience, our plant operation experts rely on comprehensive and proprietary knowledge management tools. If required, they can also call in Alstom experts with specific engineering know-how and fleet-wide experience to assist with operational support or more detailed investigations.

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Rail transport

Electrical grid

Power generation

Alstom is a global leader in the world of power generation, power transmission and rail infrastructure and sets the benchmark for innovative and environmentally friendly technologies.

Alstom builds the fastest train and the highest capacity automated metro in the world, provides turnkey integrated power plant solutions and associated services for a wide variety of energy sources, including hydro, nuclear, gas, coal, wind, solar thermal, geothermal and ocean energies. Alstom offers a wide range of solutions for power transmission, with a focus on smart grids.

Alstom

Alstom Power offers solutions which allow their customers to generate reliable, competitive and eco-friendly power.

Alstom has the industry’s most comprehensive portfolio of thermal technologies – coal, gas, oil and nuclear – and holds leading positions in turnkey power plants, power generation services and air quality control systems. It is also a pioneer in carbon capture technologies.

Alstom offers the most comprehensive range of renewable power generation solutions today: hydro power, wind power, geothermal, biomass and solar. With ocean energies, we are developing solutions for tomorrow. Alstom is one of the world leaders in hydro power, the largest source of renewable energy on the planet.

Power generation

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