steam turbine Rolling and x Curves
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Turbine Rolling and Steam Parameters
Vivek Jain
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Modern Plant Controls
•Electro-hydraulic Turbine Control System - High Pressure or Low Pressure
•Distributed Digital Control System
•Data Acquisition System•Co-ordinated Master Control
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Turbine Critical Parameters
• Shaft Vibration < 120 microns• Bearing Vibrations < 40 microns• Differential Expansion • Absolute Expansion 25.4 mm• Axial Shift of Rotor < 0.5 mm• Bearing Temperatures <900C• Turbine Wall Stress Computation -
Temperature & Load Margins
Vivek Jain
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Vivek Jain
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There are two ways to roll the turbine
• Manual Mode
• ATRS (Automatic turbine run up system)
Vivek Jain
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TURBINE ROLLING FROM BARRING SPEED
BARRING SPD 240 RPM
GATE VLV GEARING CLSD
540RPM
JOP OFF
600RPM
SOAKING OF HPS & HPC
2850RPM
AOP OFF
3000 RPM SOAKING OF IPS & IPC
TUR TRIPPED
SYNC
AOP-1 ON AT < 2800 RPM
OROIL PR < 4.8 KSC
JOP-1 ONSPD < 510 RPM
GATE V/V GEAR OPN CMD
SPD < 200 RPM
BAR SPD MAINTAINED
AOP-1 FAILS & OIL PR < 4.5 KSC AOP-2 ON CMD.
AOP-1 & 2 FAIL & OIL PR < 1.1 KSC EOP ON CMD.
PR < 95 KSCFOR 8 SEC JOP-1OFF & JOP-2 ON
Vivek Jain
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Using ATRSTHERE ARE THREE MODE OF OPERATION:
• AUTOMATIC MODE :WHEN SGC IS SWITCHED TO
“AUTOMATIC ON” & START UP/SHUTDOWN IS INITIATED,THEN STEP IS SET & COMMAND IS EXECUTED IF CRITERIAS FOR THE STEP ARE FULLFILLED.
• SEMI AUTOMATIC : IT ENABLES CONTINUATION OF
PROGRAM STEP BY STEP. ALL CRITERIA FOR A STEP IS SIMULATED BY A SWITCH.IT IS USEFUL WHEN PROGRAM STOPS DUE TO MISSING CRITERIA.
• OPERATOR GUIDE MODE :IN THIS SGC WILL NOT
ISSUE ANY COMMAND ,HOWEVER STEPS WILL PROCEED SEQUENTIALLY.COMMAND HAS TO BE GIVEN MANUALLY BY OPERATOR. Vivek Jain
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Manual Mode
• Using EHC
• Using HC
Before going further, it is necessary to review the Governing system in brief…….
Vivek Jain
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Turbine Governing Oil Circuit
Vivek Jain
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KWU Turbine Steam Admission
Vivek Jain
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Vivek Jain
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Vivek Jain
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Vivek Jain
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Vivek Jain
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Vivek Jain
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Vivek Jain
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Vivek Jain
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Vivek Jain
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Vivek Jain
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Vivek Jain
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