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08/06/2009
Design Features of the Design Features of the Ansaldo Energia advanced Ansaldo Energia advanced technology V64.3A Gas Turbinetechnology V64.3A Gas Turbine
L. MinerviniL. Minervini PowerGenEurope09, Koln, 27.05.09PowerGenEurope09, Koln, 27.05.09
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IntroductionIntroduction
Summary
V64.3A+, general description
Design Evolution of V64.3A+
Main features of Vlore Project
High Technology Instrumentation
Conclusion
In the last few years a state-of-art V64.3A Gas Turbine has been developed by Ansaldo Energia, in order to enhance operational features and increase power and efficiency.
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Ansaldo Energia V64.3A+ GTAnsaldo Energia V64.3A+ GT
Main Features
single shaft, axial exhaust
15 stages axial-flow compressor and a 4 stages axial turbine
Cold end drive
turbine blades made with thermal barrier coating and film cooling
No external air cooling required to cool turbine blades
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V64.3A+ V64.3A+ –– Combustion ChamberCombustion Chamber
Main Features - combustion
Anular combustion• 24 hybrid burners• metallic tiles, covered with ceramic shield
• Fuel Gas / Fuel Oil
• low NOx , CO emission
• high operating flexibility
• compact design
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The V64.3A+ comes from
V64.3A+ Ansaldo Gas Turbine
the V64.3A enhancement,achieved with the application of the same improvements that had driven the evolution of V94.3A to V94.3A(4)
V64.3A
StartPerformance and efficiency increase
Auxiliary system improvement
High operating flexibility
Goals
Result
V64.3A+
Materials
Heat Exchange
Mechanic
Combustion
Know-How
Improvements from V94.3A to V94.3A(4)
Technology Road Map
2002 2008
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a) Compressor
a) c) d)b)
Main Improvements on V64.3A+
Main Improvements
b) TBC on turbine stages
c) Optimization of last turbine blade
d) Optimization of turbine cold end
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Scaling of the Compressor
Results:Increased mass flow by 10 %
Increased pressure ratio
Increased margin against surge
Increased efficiency
Compressor scaled down from V94.3A(4)
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TBC for front turbine stages
Results:Increased life of blades and vanes
Increased resistance to higher firing temperature
Retrofitability
Qualified and experienced coating
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TBC for front turbine stages (2/2)
TBC in turbine stages 1° and 2°
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Turbine last stage optimization
Modification of blade casting for last stage
Results:Enabled mass flow increase on the last stage
Improved power and efficiency thanks to aerodynamic losses reduction
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Turbine last stage optimization
FEM analysis
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Diffuser optimization
Use of profiled struts (instead of ogiva-shaped ones)
Results:Enabled mass flow increase on turbine end
Improved power and efficiency thanks to aerodynamic losses reduction
Retrofitability
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Diffuser optimization
V64.3A
Ogiva-shaped strut
V64.3A+
Profiled strut
Strong reduction of aerodynamic losses
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V64.3A+ Operation V64.3A+ Operation –– PerformancesPerformances
Performances
The V64.3A+ gas turbine, F-class technology, at ISO base load, with a Turbine Inlet Temperature of 1190 °C (according to ISO 2314), has a Power Output of 75 MW and Efficiency of Gas Turbine is 35.9 %.
Plant Performance
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Performance increase:
MW 68 75
GT efficiency % 35 35.9
Compr. pressure ratio - 15.8 16.7
GT exhaust mass flow kg/s 193 213
GT exhaust temperature °C 585 574
V64.3A V64.3A+
GT power output
V64.3A+ Performance Increase
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EmissionsEmissions
On the basis of Ansaldo Energia field experience,
…when burning natural gas (load >60% BL),
-- NOx 35/40 mg/NmNOx 35/40 mg/Nm33
-- CO negligible (CO negligible (11÷÷2 mg/Nm2 mg/Nm³³).).
…when burning distillate oil (load >60% BL),
- 120 mg/Nm³ in premix mode with water inj
- CO very low (6÷7 mg/Nm³).
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Vlore ProjectVlore Project
The first V64.3A+ has been supplied for Vlore Project (Albania)
The Power Plant is a Combined Cycle based on one dual fuel Gas Turbine Model Ansaldo V64.3A+, one horizontal fired HRSG, triple pressure sections without reheater, one Steam Turbine with water cooled condenser
Delivery: August 2008
First Firing : June 2009
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V64.3A+ for Vlore ProjectV64.3A+ for Vlore Project
Main features
• Dual Fuel Gas Turbine
• Continuous Operation at Fuel Oil for the first years
• Premix operation over the whole range
• low NOx level in a wide load range
• Equipped with High Technology Instrumentation
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Additional Instrumentation VloreAdditional Instrumentation Vlore
V64.3A’s body have been equipped with several measuring point:
different stages of compressor
blow-off lines
combustion chamber,
cooling lines,
shaft and bearings
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Additional Instrumentation VloreAdditional Instrumentation Vlore
R&D Projects
The installation of an additional on-line monitoring system of HT instrumentation in Vlore is a part of an AnsaldoEnergia R&D Project actually carried on in recent years.
GT already equipped with similar instrumentation:
V94.3A(4) Gas Turbine installed in Vado Ligure (Savona, Italy)
V94.3A(2) Gas Turbine in La Casella (Piacenza, Italy)
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ConclusionConclusion
V64.3A
Start Performance and efficiency increase
Auxiliary system improvement
High operating flexibility
Goals
Result
V64.3A+
Materials
Heat Exchange
Mechanic
Combustion
Know-How
Improvements from V94.3A to V94.3A(4)
2002 2008
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Thanks for your Thanks for your attentionattention