How You BenefitThe MXL2 upgrade allows operators to switch between two modes of operation: M-mode and XL-mode. Online switching between the M and XL mode is achieved at the touch of a button.

• IntheMmode,poweroutputcanbeincreasedupto25MWincombinedcycle,andthecombinedcycleefficiency by0.8%.MaintenanceIntervalsareextendedby4.000operatinghours.

• IntheXLmode,maintenanceintervalsarefurtherextendedupto12,000operatinghours,increasingavailabilityand reducingmaintenancecosts.Theoverallplantpoweroutputcanbeincreasedupto12MWandthecombinedcycle efficiencyby0.5%

AnsaldoEnergia’sMXL2upgradeforGT26gasturbinesoffersnewlevelsofavailability,flexibilityandperformance.It allows power plant operators to adapt to fluctuatingmarket demands, enhancing performance and reducingmaintenancecosts.TheMXL2Upgradenowcomeswithanunrivalledmaintenanceintervalof40.000EOH.

MORE PERFORMANCE, LIFETIME AND FLEXIBILITY

The GT26 MXL2 upgrade is an evolutionary product that combines technological advances and many years ofoperationalexperienceintoasingleattractiveupgradepackageforAnsaldoEnergia’sGT26gasturbines.

MXL2 for GT26

Customer benefits•ImprovedoperationalflexibilityOperational flexibilitywithonlineswitchingbetween M and XL modes

•Increasedperformanceupto456MWpower outputandand59.8%efficiencyincombined cycleoperation

•ReducedmaintenancecostsInspectioninterval extendedupto12,000operatinghours

teChniCal featuresFlexible mode switching, the perfect response tofluctuatingmarketdemand• Whenmarketdemandishigh,plantoperators caninstantlyswitchtotheMmodeformaximum powerandefficiency.

• Whendemandislower,operatorscanswitchto the XL mode with a temperature drop that reduces the thermal loading on components.

• TheXLmodetranslatesintoanextensionofthe maintenanceintervalby12,000operatinghours, therebyreducingmaintenancecosts.

• The GT26 MXL2 Upgrade brings class-leading flexibility,openingupnewrevenueopportunities to plant operators meeting increasing grid challenges.

LOW PRESSURE TURBINE

BasedonproventechnologysharedwiththelatestGT26rating2011,allfourstagesoftheLPT,includingtheheatshields,havebeenredesigned:• 3Dairfoilprofilingwasappliedtoallstagestoachieve highestaerodynamicefficiency,andtheflowpathat the turbine outlet is increased

• Tosupporttheincreasedturbineinlettemperature whenoperatinginMmode,thecomponentsprotection bythermalbarriercoatinghasbeenenhanced.

• Optimisedpartcount:Loweringthevanepartcountin theLPTvanerows1and2reducestherequiredcooling air,therebyincreasingtheoverallturbineefficiency.

• Thecoolingschemesofallcomponentshavealsobeen optimised.

• Reducedlosses:ImprovedshrouddesignofLPTblades andvanesleadstoareductioninover-tipleakages enhancingtheaerodynamicturbineefficiency.

Technical SpecificationsThecoreofMXL2istheimplementationofthelatestlowpressureturbine(LPT).Thecomponentsarewellproventechnologysharedwith the latestGT26 rating2011.Allnecessarywork for theUpgrade implementationcanbecompleted on site during a regular C-inspection

COMBUSTOR

Sequentialenvironmental(SEV)combustor:ModificationstotheinnerlineroftheSEVcombustorwereintroducedtoadapttotheredesignedvane1andtooptimisecoolingattheinterfacewiththeLPT.Thepre-swirlnozzleattherotorcoverhasbeenreworkedfor improvedcoolingoffront stages.

C-inspection interval

CC P

ower

out

put /

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cien

cy

XL-mode

M-mode

MXL2

+4 - 12 MWCC+0.3 - 0.5 ηCC abs

+13 - 25 MWCC+0.6 - 0.8 ηCC abs

40.000 EOHup to +12.000 OHCompared to current intervals

GT26•  • 

MEChANICAL INTEgRATION

AccomodatingthenewLowPressureTurbinemayrequire:• TheupgradedLPTbladingrequiresanewlycastand modifiedTVC.Anewintermediateringisalsopartof thepackage.

• Turbinehousing2:Theturbinehousing2hastobe adjustedtomatchwiththerequirementsofthenew TVC.

• Exhaustgashousing:Exchangeorre-workofthe exhaustgashousingisneededtoaccommodatethe geometryoftheupgradedLPT.

• Rotor:Reworkofblade3coolingairfeeding.These modifications can be done on site.

• Anewoperatingdatacounter(ODC)allowsonline switchingbetweenthetwomodesatanytimewith different lifetime and performance characteristics

TheMXL2UpgradepackagewastestedandvalidatedintheAnsaldotestpowerplantinBirr,Switzerland.ThisistheonlyfullscaletestingfacilityavailableworldwidefortheGT26fleetandisnowwithAnsaldoEnergia.ThiswasfollowedbyasuccessfulinstallationandvalidationonacommercialGT26enginein2009Since2009,theMXL2upgradehasbeenimplementedinseveralotherplantsduringscheduledC-Inspectionsandhelpedcustomerstoremaincompetitiveunderdifferentmarketconditions..TheMXL2 isnowanestablishedandprovenupgrade.Customersarereapingtheeconomicrewardsoftheincreasedperformance,theimprovedoperationalflexibilityandthereducedmaintenancecoststhroughtheextendedinspectioninterval.

Performance

* Reference values in ISO conditions, specific data to be evaluated case by case

PowerOutputImprovement

EfficiencyImprovement

MaintenanceIntervalExtensionOH

Upto25MWCC

Upto0.8%

Upto12000

Gt performance gain*

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Ansaldo Energia, all rights reserved. Trademarks mentioned in this document are the property of Ansaldo Energia, its affiliates, or their respective owners in the scope of registration. The information contained in this document is merely indicative. No representation or warranty is provided, nor should be relied on, that such information is complete or correct or will apply to any particular project. This will depend on the technical and com-mercial circumstances. Said information is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.

AnsALdo EnErGiAViaN.Lorenzi,8-16152Genoa-Italy-Tel:+390106551-Fax:+390106553411-info@ansaldoenergia.com-ansaldoenergia.com

For more information and to reach our sales Team, please go to www.AnsaldoEnergia.com

GT26 MXL2 Gas Turbine, United Kingdom