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

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.

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

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

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

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

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)

TBC for front turbine stages

Results:Increased life of blades and vanes

Increased resistance to higher firing temperature

Retrofitability

Qualified and experienced coating

TBC for front turbine stages (2/2)

TBC in turbine stages 1° and 2°

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

Turbine last stage optimization

FEM analysis

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

Diffuser optimization

V64.3A

Ogiva-shaped strut

V64.3A+

Profiled strut

Strong reduction of aerodynamic losses

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

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

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).

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

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

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

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)

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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