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DEWA
Projects & Engineering (Generation)
Instrumentation &Control
STEAM TURBINE
Presented By
Mohamed J. Albahar
15912
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Contents
• Process
• Steam Turbine & Auxiliaries
• Sealing
• Protection
• Controller
• Startup & Shutdown
• Trip
• Losses
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ST Process
SteamControl Valve Steam
Turbine
Shutoff Valve Generator
CondenserDeaertor
Boiler Heat
Recovery
Boiler
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BPST
Process
SteamControl Valve
BPST
Steam
Turbine
Shutoff Valve Generator
LP HeaderDesalination
Plant
Boiler Heat
Recovery
Boiler
HP/LP Bypass
MP
Header
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Main Components
• Rotor
• Casing
• Blades (Impulse & reaction)
• Gland & Labyrinth seal
• Shrouded disc
• Thrust & Journal Bearing
• Balancing Piston
• Multi valve turbine & Full arc admission
• Condenser for Steam Turbine
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Auxiliaries• Lubrication Oil
• Jacking system
• Hydraulic System
• Bearings
• Turning Gear
For BPST
• Hp/LP bypass
For ST
• Vacuum Pump and Ejector
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ProtectionElectrical Protection
Lube Oil Pressure
Lube Oil tank level
Inlet pressure
Electronics control failure
Exhaust Pressure
Vibration
Bearing Temperature
LP blades Temperature
– Testing:
• Over speed protection
• Valves testing (open / close)
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Controller
• Speed Control
• Load Control
• Back pressure
• Hp Pressure Limit
LVG
Main Steam Stop
VALVE Control
Control Valve Control
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Start Up• Turbine reset
• Pre-start check (turbine’s condition)
• Run-Up (Acceleration rate & target speed)
• MSV/CV transfer (for warming up the line)
• Limit speed matching (heat soak time &
synchronization)
• Initial load
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Shutdown
• Change over from LP control mode to Bypass
• Decrease the Generator load
• Remove the Generator from the Grid
• Decrease PMC load demand
• Turbine Trip
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Losses
• Initial friction in the nozzle
• Outlet steam kinetic energy
• Through the glands
• Humidity in the steam
• Towards the outside (thermal insulation)
• Mechanical losses
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Trip
• Generator Trip.
• Over speed.
• Oil Tank level low.
• High or Low Back Pressure Steam.
• Bearing white metal temp High.
• Hydraulic Oil pressure Low.
• Rotor axial displacement exceeded set point
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