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GAS TURBINE INLET AIRGAS TURBINE INLET AIR

SYSTEMSYSTEM

GTG COOLING AIR SYSTEMGTG COOLING AIR SYSTEM

STG COOLING AIR SYSTEMSTG COOLING AIR SYSTEM

BY : ANURA FERNANDO 

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Gas Turbine Inlet Air SystemGas Turbine Inlet Air System

The intake weather hoodsThe intake weather hoods

The inlet filter compartmentThe inlet filter compartment

The inlet ductingThe inlet ducting

The gas turbine inlet plenumThe gas turbine inlet plenum

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GT Inlet Air systemGT Inlet Air system

Weather hoodand drifteliminator 

Pre filer Fine filter 

Pressure

indicators

Pressure

switches

Flexiblebellow

Bird mesh silencer and baffle plates

Ducting connectedto bell mouth

To GT inlet

plenum

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GT AIR FLOW FROM INLET TOGT AIR FLOW FROM INLET TO

EXHAUSTEXHAUST

FILTER 

HOUSE

DUCT &

SILENCER 

INLET

PLENUM

IG

V

63TF 1

63TF 2A

63TF 2B

LOAD

EXHAUST

PLENUM

INLET

FLOW

EXHAUST

DUCTING

EXHAUSTFLOW TO

HRSG

63EA 1

63ET 1

63ET 2

COMBUST

WEATHER HOOD

PRE FILTER 

FINE FILTER 

SYSTEM TOTAL

5TH STAGE AIR EXTRACTION

11TH STAGE AIR EXTRACTION

COMP. DISCHARGE EXTRACTION

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Intake Louvers and Weather Intake Louvers and Weather 

HoodsHoods intake provides a path for air tointake provides a path for air to

enter the inlet filter compartmententer the inlet filter compartment

intake louvers reduce theintake louvers reduce theconcentration of entrained rainconcentration of entrained raindropletsdroplets

Mesh provides protection againstMesh provides protection againstlarge objects from striking the filterlarge objects from striking the filtermediamedia

Drift eliminator removes the majorityDrift eliminator removes the majority

of entrained moisture dropletsof entrained moisture droplets

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Inlet Filter CompartmentInlet Filter Compartment

inlet filter compartment provides ainlet filter compartment provides alocation for pre filters and fine filterslocation for pre filters and fine filters

filters are periodically replaced whenfilters are periodically replaced whenthe pressure drop exceeds 65mmWc.the pressure drop exceeds 65mmWc.

High filter dp will result in loss of High filter dp will result in loss of gas turbine performance and degas turbine performance and de

loading of GTloading of GTFilter dp alarm set at 150mmWc andFilter dp alarm set at 150mmWc and

de loading of GT at 180mmWc .de loading of GT at 180mmWc .

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Inlet DuctInlet Duct

Flexible bellow connects filter houseFlexible bellow connects filter houseto inlet ductto inlet duct

directs the treated inlet air from thedirects the treated inlet air from theinlet filter compartment to the gasinlet filter compartment to the gasturbine inlet plenum.turbine inlet plenum.

contains acoustically treatedcontains acoustically treatedsilencing panels and trash screensilencing panels and trash screen

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Gas Turbine Inlet PlenumGas Turbine Inlet Plenum

located immediately upstream of thelocated immediately upstream of thegas turbine inlet and contains thegas turbine inlet and contains the

compressor inlet bell mouth.compressor inlet bell mouth.provide a relatively turbulentprovide a relatively turbulent--freefree

region at the inlet to the compressorregion at the inlet to the compressorinlet guide vanesinlet guide vanes

Inlet bell mouth contains nozzlesInlet bell mouth contains nozzlesused for on and offline waterused for on and offline waterwashingwashing

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GT Pre Filter AAF Dry Pac 6 pocket pre filter 

� Synthetic material blown to

progressive density to capture

particles of varying grades

� High dust holding capacity

�Water resistant

� low pressure drop

� incinerable

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GT Fine Filter GT Fine Filter AAF DuraCel XL Fine Filter AAF DuraCel XL Fine Filter 

� Glass fiber woven media

�Withstand temperature up to 150deg. C

� Media folded between pleated separators

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GT filter DP trendsGT filter DP trends

GT filte dp from 1 Fe to 30 Dec 2008

0

10

20

30

40

50

60

70

80

1-

eb

16-

eb

2-

Mar 

17-

Mar 

1-

pr 

16-

pr 

1-

May

16-

May

31-

May

15-

Jun

30-

Jun

15-

Jul

30-

Jul

14-

ug

29-

ug

13-

ep

28-

ep

13-

Oct

28-

Oct

12-

o

27-

o

12-

Dec

27-

Dec

dp 

Wc

GT pre filter dp

GT fine filter dp

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GTG cooling air GTG cooling air 

GTG Rotor Centrifugal

impeller 

CO2 dampers

GTG

Inlet

filter 

house

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GTG filter dp trendsGTG filter dp trends

GTG filter dp e t e

  

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¢   

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§  ̈

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%  

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 ̈

1   

e'  

  

 ̈

1   

e'  

dp in 

Wc

GTG fine filter dp

GTG pre filter dp

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STG cooling air STG cooling air 

STG Rotor 

Centrifugal

impeller 

Water cooling

modules