Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

1

7.4 SHUTDOWN PROCEDURE7.4 SHUTDOWN PROCEDURE

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

2

CONTENTSCONTENTS

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

Parameter HP upper casing inner metal temperature HP lower casing inner metal temperature IP upper casing inner metal temperature (at exhaust) IP lower casing inner metal temperature (at exhaust)

3

Item check list

(1) Casing metal temperature and temperature differences

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

4

ALLOWABLE TEMPERATURE DIFFERENCESALLOWABLE TEMPERATURE DIFFERENCESBETWEEN THE UPPER AND LOWER CASINGBETWEEN THE UPPER AND LOWER CASING

DURING SHUTDOWNDURING SHUTDOWN

SHUTDOWN PROCEDURE

Tem

pera

ture

Diff

eren

ce

Sta

rt t

o ro

ll

Cha

nge

of s

et p

oint

(30%

load

)

Rat

ed L

oad

50°C

①～⑤100°C

① HP Exhaust Chamber

② Reheat Steam Chamber

③ IP 2nd Extraction

④ IP 3rd Extraction

⑤ IP Exhaust Chamber

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

Parameter Set PointNo. 1 bearing metal temperature Less than 115° CNo. 2 bearing metal temperature Less than 115° CThrust bearing front metal temperature (Right) Less than 85° CThrust bearing front metal temperature (Left) Less than 85° CThrust bearing rear metal temperature (Right) Less than 85° CThrust bearing rear metal temperature (Left) Less than 85° CNo. 3 bearing metal temperature Less than 107° CNo. 4 bearing metal temperature Less than 107° CNo. 5 bearing metal temperature Less than 107° CNo. 6 bearing metal temperature Less than 107° C

5

Item check list

(2) Bearing metal temperature

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

Parameter Set PointNo. 1 bearing oil drain temperature Less than 79° CNo. 2 bearing oil drain temperature Less than 79° CThrust bearing front oil drain temperature Less than 79° CThrust bearing rear oil drain temperature Less than 79° CNo. 3 bearing oil drain temperature Less than 79° CNo. 4 bearing oil drain temperature Less than 79° CNo. 5 bearing oil drain temperature Less than 79° CNo. 6 bearing oil drain temperature Less than 79° CBearing feed oil temperature 45° C(Normal)

6

Item check list

(3) Lube oil feed and drain temperature

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

7

49°C

38°C 38°C

27°C

Continuousturning

operation10°C

Tu

rnin

g t

rip

Fee

d o

il t

emp

erat

ure

(C

)

1/2

rate

d

spee

d

Tu

rnin

g g

ear

eng

aged

Shutdown Feed Oil TemperatureShutdown Feed Oil Temperature

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

Parameter Set PointEccentricity Less than 110%HIP turbine differential expansion R.L = 9.4 mm

R.S = 6.8 mmLP turbine differential expansion R.L = 7.0 mm

R.S = 5.2 mm

8

Item check list

(4) Eccentricity and Expansion

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

Parameter Set PointNo. 1 bearing vibration Less than 0.125mm (0-900 rpm)

Less than 0.150mm (900-2700 rpm)Less than 0.125mm (2700-3000rpm)

No. 2 bearing vibration As aboveNo. 3 bearing vibration As aboveNo. 4 bearing vibration As aboveNo. 5 bearing vibration As aboveNo. 6 bearing vibration As aboveOver hang support vibration As above

9

Item check list

(5) Bearing vibration

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

10

ORANGE　 BAND

ROTOR　 LONG

GREEN　MARK

ROTOR　 SHORT

RED　 BAND RED　 BAND

RED　MARK

SHELL & DIFFERENTIAL EXPANSIONSHELL & DIFFERENTIAL EXPANSION

(1) HIP ROTOR

Don’t Operate Don’t Stop turning

Normal Operation range(Turning)

Normal Operation range

Don’t Start Turbine

Differential Expansion 0Don’t Operate

ExampleExample

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

11

ORANGE　 BAND

ROTOR　 SHORT

GREEN　MARK

ROTOR　 LONG

RED　 BAND RED　 BAND

RED　MARK

(2) LP ROTOR

Don’t Operate Don’t OperateDon’t Start Turbine

Normal Operation range

Normal Operation range(Turning)

Don’t Stop turning

Differential Expansion 0

ExampleExample

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

12

REDUCING LOAD REDUCING LOAD TODESYNCHRONIZING

3

1 2

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

13

CONDENSERVACUUM BREAK

3 4

TURNING GEAR INSERVICE

7

CONDENSATE WATER

SYSTEM OUT OF SERVICE

8

92

BOILER SHUTDOWN

5

GLAND STEAM SEAL SYSTEM OUT OF

SERVICE

6

TURBINE TRIP ANDDESYNCHRONIZING

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

14

STEAMINLET

STEAMOUTLET

Pit

Condenser Flash Box

Before 　SeatDrain 　Valve

After　 SeatDrain 　Valve

LOCATION OF THE DRAIN VALVES FOR MSVLOCATION OF THE DRAIN VALVES FOR MSV

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

15

Condenser Flash Box

After　 SeatDrain 　Valve

STEAMINLET

STEAMOUTLET

LOCATION OF THE DRAIN VALVES FOR CRVLOCATION OF THE DRAIN VALVES FOR CRV

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

16

CONDENSERVACUUM BREAK

3 4

TURNING GEAR INSERVICE

7 8

92

5

GLAND STEAM SEAL SYSTEM OUT OF

SERVICE

6

CONDENSATE WATER

SYSTEM OUT OF SERVICE

BOILER SHUTDOWN

SHUTDOWN PROCEDURE

TURBINE TRIP ANDDESYNCHRONIZING

Recommended Maximum Vacuum Break Point is 2300 rpm

Recommended Maximum Vacuum Break Point is 2300 rpm

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

17

CONDENSERVACUUM BREAK

3 4

TURNING GEAR INSERVICE

7 8

92

5

GLAND STEAM SEAL SYSTEM OUT OF

SERVICE

6

CONDENSATE WATER

SYSTEM OUT OF SERVICE

BOILER SHUTDOWN

SHUTDOWN PROCEDURE

TURBINE TRIP ANDDESYNCHRONIZING

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

18

CONDENSERVACUUM BREAK

3 4

TURNING GEAR INSERVICE

7 8

92

5

GLAND STEAM SEAL SYSTEM OUT OF

SERVICE

6

CONDENSATE WATER

SYSTEM OUT OF SERVICE

BOILER SHUTDOWN

SHUTDOWN PROCEDURE

TURBINE TRIP ANDDESYNCHRONIZING

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

19

CondenserSSFBV

From Aux. STEAM

SSFV SPUV

To ATM

Gland SteamExhauster

Gland　 Steam　 Condenser

HP IP LP LP

GLAND STEAM SEAL SYSTEMGLAND STEAM SEAL SYSTEM

SHUTDOWN PROCEDURE

Gland Steam Can Be Stopped After Vacuum Decreases to –6.6 kPag.

Gland Steam Can Be Stopped After Vacuum Decreases to –6.6 kPag.

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

20

CONDENSERVACUUM BREAK

3 4

TURNING GEAR INSERVICE

7 8

92

5

GLAND STEAM SEAL SYSTEM OUT OF

SERVICE

6

CONDENSATE WATER

SYSTEM OUT OF SERVICE

BOILER SHUTDOWN

SHUTDOWN PROCEDURE

TURBINE TRIP ANDDESYNCHRONIZING

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

21

CIRCULATION WATER

SYSTEM OUT OF SERVICE

TURNING GEAR

OUT OF SERVICE

LUBRICATING OIL

SYSTEM STOP

COOLING WATERSYSTEM OUT OF SERVICE

8

9 10 12

13

GENERATOR SHAFTSEALING AND GAS

SYSTEM OUT OF SERVICE

11

SHUTDOWN PROCEDURE

Turning Gear Should Not Be Stopped Until 1st. Stage Metal Temperature is Less Than 250°C.

Turning Gear Should Not Be Stopped Until 1st. Stage Metal Temperature is Less Than 250°C.

Main Oil Pump Cannot Be Stopped Until 1st. Stage Metal Temperature is Less Than 200°C.

Main Oil Pump Cannot Be Stopped Until 1st. Stage Metal Temperature is Less Than 200°C.

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

22

TURNING GEAR

OUT OF SERVICE

LUBRICATING OIL

SYSTEM STOP8

9 10 12

13

GENERATOR SHAFTSEALING AND GAS

SYSTEM OUT OF SERVICE

11

COOLING WATERSYSTEM OUT OF SERVICE

CIRCULATION WATER

SYSTEM OUT OF SERVICE

SHUTDOWN PROCEDURE

If Babbitt Bearing Temp. Reaches 150°C., An Open Inspection of Bearings Must Be Made Prior to Startup.

If Babbitt Bearing Temp. Reaches 150°C., An Open Inspection of Bearings Must Be Made Prior to Startup.

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

23

LUBRICATING OIL

SYSTEM STOP8

9 10 12

1311

TURNING GEAR

OUT OF SERVICE

GENERATOR SHAFTSEALING AND GAS

SYSTEM OUT OF SERVICE

COOLING WATERSYSTEM OUT OF SERVICE

CIRCULATION WATER

SYSTEM OUT OF SERVICE

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

24

CIRCULATION WATER

SYSTEM OUT OF SERVICE

TURNING GEAR

OUT OF SERVICE

LUBRICATING OIL

SYSTEM STOP

COOLING WATERSYSTEM OUT OF SERVICE

8

9 10 12

13

GENERATOR SHAFTSEALING AND GAS

SYSTEM OUT OF SERVICE

11

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

25

Emergency Shut down Procedure

Emergency Shut down Procedure

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

26

After tripping the unit check the following:

(1) Turbine Trip The MSV, CVs and CRVs (L/R) are closed

(2) Confirm that the Boiler Condition (3) The Generator circuit breaker (52G) and Field circuit breaker

(41E) are open

SHUTDOWN PROCEDURE

Classroom Lecture Series for Steam Turbine Generator 　 TOSHIBA

T/G OPERATION

27

The following valves should be open:

(1) MSV before seat drain valve

(2) MSV after seat drain valve

(3) CRV (R/L) drain valves

SHUTDOWN PROCEDURE