OPERATION OF OPERATION OF

STEAM TURBINESTEAM TURBINE

GENERAL GENERAL ARRANGEMENTARRANGEMENT

HOT EXHAUST GAS

CTGHRSGHP SH

RH

IP SH

LP SH

LP STEAM

IP STEAM

HP STEAM

HPT

CONDENSER

IPT LPT GEN

HOTWELL PUMP

BOILER FEED WATER SYSTEM

IP-TBVIP-TBVHP-TBVHP-TBV

PROCESS OF STEAM PROCESS OF STEAM TURBINE START-UPTURBINE START-UP

AUX. EQUIPMENT OPERAITON

CTG & HRSG START UP

GLAND STEAM SERVICE IN

CONDENSER VACUUM UP

STG TURNING OPERATION

TURBINE RESET & SPEED UP

SYNCHRONIZATION

LOAD UP

CIRCULATING WATER SYSTEMCIRCULATING WATER SYSTEM

BEARING COOLING WATER SYSTEMBEARING COOLING WATER SYSTEM

CONDENSATE WATER SYSTEMCONDENSATE WATER SYSTEM

FEED WATER SYSTEMFEED WATER SYSTEM

and so on.and so on.

LIMIT ON OPERATION

VALVE TRANSFER

START-UP FOR OIL SYSTEMSTART-UP FOR OIL SYSTEM

1, CHECK THE MAIN OIL TANK LEVEL

2, START VAPOR EXTRACTOR FAN

3, START TURNING OIL PUMP (or MAIN OIL PUMP)

4, CHECK OPERATION STATUS LEAK CHECK , OIL TANK LEVEL , TANK INNER PRESSURELEAK CHECK , OIL TANK LEVEL , TANK INNER PRESSURE

OIL PRESSURES , TURNING GEAR SPRAY OIL PRESSURE , and so on.OIL PRESSURES , TURNING GEAR SPRAY OIL PRESSURE , and so on.

Double 3 Way Valve

To No5,6To No5,6 Brg.Brg.

To Thrust Brg.To Thrust Brg.

To No.1 To No.1 Brg.Brg. To No2 To No2

Brg.Brg.

To No3 To No3 Brg.Brg. To No.4 To No.4

Brg.Brg.

Turning GearTurning Gear

From AOPFrom AOP(For back up of MOP)(For back up of MOP) From EOPFrom EOP

(For Emergency(For Emergency Operation (AC Power Lost)Operation (AC Power Lost)

From TOPFrom TOP(For Turning Operation and(For Turning Operation andEmergency Operation)Emergency Operation)

From MOPFrom MOP(For Normal Operation)(For Normal Operation)

START UP OF TURBINE OIL SYSTEMSTART UP OF TURBINE OIL SYSTEM

TURNINIG OPERTIONTURNINIG OPERTIONTURNING OIL PRESS.> 0.3 bargECCENTRICITY < 0.075 mm

3rpm

START UP FOR GLAND STEAM SYSTEMSTART UP FOR GLAND STEAM SYSTEM

1, START GLAND STEAM CONDENSER FAN

2, START SERVICING FOR GLAND STEAM HEADER

3, START VACUUM PUMP

4, CLOSE VACUUM BREAKER

OTHER AUX. SYSTEM MUST BE IN SERVICE PRIOR TO START GLAND STEAM SYSTEM.

IT WILL TAKE A SHORT TIME FOR ESTABLISHING REQUIRED GLAND STEAM PRESSURE BECAUSE OF WARMING UP THE STEAM PIPE.

VACUUM BREAKER SHOULD BE CLOSED AFTER ESTABLISHING FOR SOME EXTENT OF VACUUM IN CONDENSER FOR PREVENTING UNEXPECTED PRESSURIZING ON CONDENSER.

CTG & HRSG START-UPCTG & HRSG START-UP

CTG HRSG

HP SH

RH

IP SH

LP SH

HP STEAM

HPT IPT LPT GEN

VE

NT

ST

AC

K

GLAND STEAM HEADER

TO STG

CTG must be started for supplying STG gland steam

GLAND STEAM GLAND STEAM FLOW DIAGRAMFLOW DIAGRAM

Press. : 0.3 barg

Temp. : 150 deg.C

(superheated 14deg.C

GLAND STEAM SETTING

GLAND STEAM HEADER

Gland Steam Condenser Fan

GLAND STEAM GLAND STEAM SYSTEM SYSTEM

LP GLAND STEAM FLOW

Start up mode Required gland steam temp

COLD START 160~180 deg.C or more

WARM START 200~240 deg.C or more

HOT START 300 deg.C more

GLAND STEAM CONDENSER

VACUUM UPVACUUM UP

VACUUM LOW SETTING

LOW TRIP. : 550mmHg

LOW ANN. : 635mmHg

VACUUM UP AREA

CONDENSER

HP/IP-LP TURBINE

HTR/LTR PIPE

CTGHRSGHP SH

RH

IP SH

LP SH

LP STEAM

IP STEAM

HP STEAM

HPT

CONDENSER

IPT LPT GEN

HOTWELL PUMP

BOILER FEED WATER SYSTEM

WARMING UP FOR STEAM PIPESWARMING UP FOR STEAM PIPES

VE

NT

ST

AC

K

CURTAIN SPRAY

Start up mode Stem Press Set. Main Steam Temp

COLD START 350~400 deg.C

WARM START 400~430 deg.C

HOT START

HP : 60baraIP : 12bara

430 deg.C more

REQUIRED STEAM CONDITION FOR REQUIRED STEAM CONDITION FOR STEAM ADDMISSION TO TURBINESTEAM ADDMISSION TO TURBINE

Steam pressure is controlled by HP and IP turbine by-pass valve at pre-determined set value.

Start up mode HP turbine 1st Stage Metal Temp

COLD START < 120 deg.C

WARM START 120~350 deg.CHOT START 350 deg.C more

REQUIRED STEAM CONDITION

TURBINE START UP MODE

EXAMPLE OF LIMIT ON EXAMPLE OF LIMIT ON OPERATION -(1)OPERATION -(1)

APPLICATION ALARM TRIPVibration 125um 250um Int.

Journal Brg. Metal Temp. 107deg.C 113deg.C Man.

Thrust Brg. Metal Temp. 99deg.C 107deg.C Man.

Brg. Oil Drain Temp 77deg.C - -

Rotor Position ± 0.9mm ± 1.0mm Man

Eccentricity 75um<50 um @ 0~600rpm

-

HP -11.4 ~ +5.3mm -Differential Expansion

LP -9.7 ~ +15.5mm -

Man. : Manual Trip , Int. : Interlock Trip

APPLICATION ALARM TRIPVacuum 635 mmHg 550 mmHg Int.

80 deg.C 120deg.C Man.Exhaust Steam Temp.Exhaust Spary Set : 70 deg.C

Bearing Oil Press < 0.75barg 0.45~0.55barg Int.HP Control Oil Press 16 barg - -HP/IP Upper - LowerTemp. Diff Temp

42 deg.C 66 deg.C Man

Flange – Bolt Diff Temp 110 ~ -30 deg.C -……and so on.

Man. : Manual Trip , Int. : Interlock Trip

EXAMPLE OF LIMIT ON EXAMPLE OF LIMIT ON OPERATION -(2)OPERATION -(2)

EVENTS AT SPEED UP & WARMINGEVENTS AT SPEED UP & WARMING

TURNING WITH VACUUMTURBINE RESET (GV & RSV FULLY OPENED)

SPEED UP

HEAT SOAK

RUB CHECK

500rpm

SPEED UP COMPLETION

3000rpm

2000rpm

SYNCHRO

INIT. LOAD HOLDING

SPEED UP RATELOAD UP RATE

START UP SCHEDULE AND START UP SCHEDULE AND PARAMETERSPARAMETERS

APPLICATION (unit) COLD WARM HOT

Speed Up Rate rpm/min 150 300 300

Rub Check Time @500rpm min 15 0 0

Heat Soak Time @2000rpm min 180 0 0

Initial Load Holding Time min 30 20 0

%/min 0.5 0.5 1.0Load Up Rate

Init. Load 5% 5% 10%

Medium Load Holding Time Min 30 20 0Load Up Rate(Mid load to full load) 1.0 1.0 2.0

TURBINE RESETTURBINE RESETAND SPEED UPAND SPEED UP

TURNING WITH VACUUM TURBINE RESETSPEED UP

RUB CHECK500rpm

HP-CV & RSV

HP-SV & ICV

HP-CVHP-SV

RSV ICV

100%

VALVE OPENING

RESET SPEED UP

CONTROL OJBECTS

TURBINE SPEED : Controlled by HP-SV and ICV

INITIAL PRESSURE : Controlled by HP/ IP Turbine By-Pass Valve

HEAT SOAK AND HEAT SOAK AND CRITICAL SPEEDCRITICAL SPEED

HEAT SOAK

2000rpm

PURPOSE OF HEAT SOAK

In order to avoid excess thermal stress in the rotor, it is important to have 2hours holding time at 2000rpm at cold start up.

STRESS CONTROLLER

Temp. Diff (Rotor Outer Surface - Rotor Mean ) > 70 deg.C

[SPEED UP HOLD COMMAND][SPEED UP HOLD COMMAND]

CRITICAL SPEED

1000rpm 3000rpm2000rpm

900~1050rpm

1150~1600rpm

1850~1950rpm

2050~2150rpm

2300~2800rpm

VALVE TRANSFERVALVE TRANSFER

HP-SVHP-CV

HP-CVHP-SV

RSV ICV

100%

VALVE OPENING

SYNCHRO VALVE TRANSFER

CONTROL OJBECTS

LOAD : Controlled by HP-CV and ICV

INITIAL PRESSURE : Controlled by HP/ IP Turbine By-Pass Valve

3000rpm

VALVE TRANSFERSYNCHRO

LOAD UP PROCESSLOAD UP PROCESS

HP-CV / ICV

100%

Tubine by-pass valve program close

HP/iP Turbine By-pass Valve

STG Load

CTG LOAD UP

Main Steam PressTotal CTG Load

Initial Press control by STG governor

Load up depending on CTG load

HP-CV and ICV shall be fully opened above approx. 40% of rated load.

From 1-CTG on 1-STGFrom 1-CTG on 1-STG

to 2-CTG on 1-STGto 2-CTG on 1-STG

LP STEAM

IP STEAM

HP STEAM

HOT EXHAUST GAS

CTGHRSG

HP SH

RH

IP SH

LP SH

HPT

CONDENSER

IPT LPT GEN

HOTWELL PUMPHOT EXHAUST GAS

CTGHRSG

HP SH

RH

IP SH

LP SH

Before opening of 2nd HRSG Stop Valve, 1st and 2nd HRSG temp. difference should be within ±50deg.C