GAS TURBINE

OPERATIONAL FUNDAMENTALS & FUNCTIONS

MUDASSIR NAWAZManagement Associate (Batch-18)

Operations (Utilities)

INTRODUCTION

FLOW DISCRIPTION

FUNDAMENTALS

DIFFERENT SECTIONS

STARTUP STEPS

CONTENTS

INTRODUCTION

Model PG-5371

ISO Rated Power 26.3MW

Control System MARK V(TMR)

RPM 5094

Drive Generator

GAS TURBINE

FLOW DISCRIPTION

COMBUSTION CHAMBER

TURBINECOMPRESSOR

LOADSTARTINGMEAN

EXHAUST

FUEL GAS

AMBIENT AIR

ATMOSPHEREHRSG

GAS TURBINE FUNDAMENTAL

1

2 3

4

P

V

1 2 COMPRESSION

BRAYTON CYCLE

2 3 COMBUSTION

4 1 EXHAUST

3 4 EXPANSION

GAS TURBINE SECTIONS

Accessory Section

Air Inlet Section

Compressor Section

Combustion Section

Turbine Section

Exhaust Section

ACCESSORY SECTION

Starting Means (Diesel Engine)Torque ConverterAccessory Drive gearMain/Auxiliary Lube Oil PumpEmergency Lube Oil PumpMain/Auxiliary Hydraulic

Oil PumpLube Oil CoolersLube Oil Filters

Main Hydraulic Oil Pump

Accessory Drive Gear

Torque Converter

Lube Oil Reservoir1700 Gallon

F 5µ

Trip Oil Filter

Lube Oil Cooler

VPR2-1

VPR1-1

VR1-1

F 5µ

Lube Oil Filter

F 0.5µ

Coupling Oil Filter

Shaft DrivenGear Pump

Auxiliary Pump

Emergency Pump

Coupling Oil

To Hydraulic Oil Pump

Bearing OilTrip Oil

AccessoryCoupling

ActiveThrust

InactiveThrust

No # 1JournalBearing

LoadCoupling

LoadEquipment

Coupling Oil

Lube Oil Drain to Reservoir

Bearing Oil

No # 2JournalBearing

AIR INLET SECTION

Filter CompartmentSilencing BafflesTrash ScreensAir Inlet PlenumInlet Guide Vanes Filter

Compartment

SilencingBaffles

Air Flow

TrashScreen

Air InletPlenum

IGV

PinionsRack

COMPRESSOR SECTION

Inlet Casing Forward Casing Aft Casing Discharge Casing

4th StageAir

10th StageAir

17th StageAir

Compressor Rotor

COMBUSTION SECTION

Combustion ChambersFuel NozzlesCrossfire TubesSpark PlugsFlame DetectorsTransition Pieces

TURBINE SECTION

First StageSecond Stage

1th Stage

2nd Stage

EXHAUST SECTION

DiffuserExhaust ThermocouplesDiverter DamperGuillotine Damper

FUEL GAS SYSTEM

Gas stop/speed ratio valve (SRV) Gas control valve (GCV)Gas pressure gaugesGas vent valveGas fuel hydraulic trip relayHydraulic oil operated servo valves

90SR-1

65GC-1

Trip Oil

SRV GCV

Fuel Gas

Hydraulic Oil

P2P3

P1

VH5-1

GasNozzles

20VG-1

STARTUP STEPS

Purging

Warming up time

Auxiliary lube/hydraulic oil pump and Ratchet motor start, Jaw clutch will engage, Diesel engine start

START(14HR(0% SPEED)

CRANKING14HM(20% SPEED)

FIRE(UPTO 50% SPEED)

At 60% speed Diesel engine disengage and shutdownACCELERATE

14HA(50% SPEED)

At 95% speed aux lube/hydraulic oil pump stop, bleed valves closes

FSNL14HS(95% SPEED)

TRIPPING CAUSES

High Inlet Filter ∆PLow Lube Oil PressureLow Trip Oil PressureHigh Exhaust PressureHigh Lube Oil TemperatureHigh Exhaust Temperature

High Temperature SpreadLoss Of FlameOver Speed TripHigh VibrationDiverter/Guillotine Damper

ClosedCO2 Released

Questions are Welcome ???