Gas turbine Inle and Compressor

8/13/2019 Gas turbine Inle and Compressor

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INLET SYSTEM



Evaporative cooler

Filter house

Compressor Bleed heating

Inlet Silencer duct

Inlet casing -IGV

Inlet system consists of



Lowering the compressor inlet temperature can beaccomplished by

installing an evaporative cooler or inlet chiller in the inlet

ducting downstream of the inlet filters. Evaporative cooling is limited to ambient temperatures and

above because of the potential for icing the compressor.

Effectiveness is a measure of how close the cooler exit

temperature approaches the ambient wet bulb temperature.Chillers, unlike evaporative coolers, are not limited by the

ambient wet bulb temperature.

Evaporative cooler



Filter House

High efficiency media filter of 3 Modules, each consists of 19X4 Nos(Total 3X19X4 = 228 Nos)

Number of cylinder filter element 228Nos

Number of cone filter element 228 NosEstimated initial airflow restriction :3mbar

Pulse cycle start 5.5 mbar, Stop at4.5mbarl

Filtration : <1 micron

mechanical protection of the filter housingand inlet duct sections against implosion



Filter House

Droplet catchers Assembly



The Compressor Bleed Inlet Bleed Heating system involves recalculationof higher temperature compressor discharge air to the compressor inletused for the following three main purposes :

1 To prevent conditions necessary for the formation of ice on the first stagestator blades.

2 To extend emission compliance to lower loads by allowing exhausttemperature control to occur at lower inlet guide vane angles.

3 To provide sufficient compressor operating margin by reducing thecompressor pressure ratio and by heating the compressor inlet air.

Inlet bleed heating



Inlet silencer duct

the protection of the personnel against noise andtemperature • protection of the GT unit section against climatic

agents.

Silencerpads



GT inlet air flow = 165 m3/s

IGV minimum Angle 32 deg

Maximum 84deg

Number of Blades :64

Inlet casing -IGV



Inlet Guide vane

RACKRING

OUTERSHAFT

SPACER

ROOTOF VANE

X2

X1X

MIDSPANOF VANE

TIPOF VANE

INLETGUIDEVANE

THRUSTWASHER

INNERSTUBBUSHING

BUSHINGSGEARRACK

INLETCASING

Constructionaldetails



Inlet Guide vane

GT consists of online as well as offline water washsystem

Off line wash 10M 3 /hr

Offline wash 9 Spray nozzles

Online wash 18 spray nozzles



• Mid- sized Member of the GE’s F Technology Family

– 75 MW Class

• Worldwide Applications – 61 Units Installed or on Order

• Upgraded in 2002 for Higher Output and Efficiency• Environmentally Friendly

– 15 ppmvd NOx with gas

6FA OVERVIEW



HEAVY DUTY GAS TURBINE MODEL DESIGNATION

PG 6 10 1 (FA)

APPLICATION SERIES POWER NO. OFSHAFTS

SERIES

M- Mech.. Drive

PG- Pkgd. Gen.

FRAME1, 3, 5, 6,7, 9

Approx.output powerin Hundreds,Thousands, or 10Thousands ofHorsepower

1 or 2









6FA – Simple Cycle Performances

• 6 Can Annular DLN Chambers• Dual Fuel Capability• 15 ppm NOx

(15% 02) with Gas Fuel• 1327 ° C Firing Temperature

• 15.6:1 Axial Flow Compressor• 18 Stages• IGV• Flared Compressor Front• Through Bolted Construction

• 3 High Efficiency Stage Turbine• Through Bolted Construction• Advanced Materials• Enhanced Cooling

• Cold End Drive • 2 Bearings

Not to Scale



Output 75.9 MW

Heat Rate 10,300 kJ/kWhPressure Ratio 15.6Exhaust Flow 756 t/hExhaust Temperature 605 ° CModel PG6101FA

RPM 5231DLN Combustors, Natural Gas / ISO Conditions

6FA – Simple Cycle Performances



6FA – Compressor Section

18 Stages, Axial FlowHigh Flow Uncambered IVGFlared Inlet & CompressorCasingThrough Bolted Disc RotorHigh Pressure Packing SealHigh Radius Rabbet Rotor



• 6 Can Annular Chambers Reverse Flow• Dual Fuel Capability• Dry Low NO x Combustion System:

– Gas: 15 ppm NO x (15%, O 2) – Distillate: 42 ppm NO x

(15%, O2) with Water Injection

• Advanced Cooling - Double Envelope• Thermal Barrier Coating• Proven DLN Design and Experience

6FA – Combustion





6FA – Turbine Section

3 High Efficiency Stages1327°C (2420°F) Advanced Cooling Techniques Internal to the Rotor

Expended Use of Film CoolingThrough Bolted Disc/Spacer RotorImproved Turbine Sealing

Brush SealsHoneycomb SealRadial Seal

Thermal Barrier & Corrosion Coatings for Nozzles& Buckets



6FA – Materials

Prior ServiceWheels 6B/9E 9FA

Compressor NiCrMoV/CrMo

V

Turbine IN-706 Combustion

Transition Piece Nimonic 263 Liner Nimonic 263

BucketStage 1 GTD-111 DS Stage 2 GTD-111 DS Stage 3 GTD-111 EA

NozzlesStage 1 FSX 414

Stage 2 GTD-222 Stage 3 GTD-222



Application Flexibility –

Industrial Cogeneration and District Heating – Combined cycle

• High Efficiency – 35 % in Simple-Cycle – 54.7 % in Combined-Cycle

• Environmentally Friendly – 15 ppmvd with Natural Gas - Dry Low NOx Combustors

• Short Cycle Installation and Start Up• Proven Product

6FA – Summary

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Gas turbine Inle and Compressor