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8/13/2019 Gas turbine Inle and Compressor
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INLET SYSTEM
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Evaporative cooler
Filter house
Compressor Bleed heating
Inlet Silencer duct
Inlet casing -IGV
Inlet system consists of
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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
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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
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Filter House
Droplet catchers Assembly
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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
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Inlet silencer duct
the protection of the personnel against noise andtemperature • protection of the GT unit section against climatic
agents.
Silencerpads
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GT inlet air flow = 165 m3/s
IGV minimum Angle 32 deg
Maximum 84deg
Number of Blades :64
Inlet casing -IGV
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Inlet Guide vane
RACKRING
OUTERSHAFT
SPACER
ROOTOF VANE
X2
X1X
MIDSPANOF VANE
TIPOF VANE
INLETGUIDEVANE
THRUSTWASHER
INNERSTUBBUSHING
BUSHINGSGEARRACK
INLETCASING
Constructionaldetails
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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
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• 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
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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
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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
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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
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6FA – Compressor Section
18 Stages, Axial FlowHigh Flow Uncambered IVGFlared Inlet & CompressorCasingThrough Bolted Disc RotorHigh Pressure Packing SealHigh Radius Rabbet Rotor
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• 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
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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
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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
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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