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Ensuring Smooth Turbine Control: The Control Oil System

The control oil system of steam turbine is completely separated from the lubricating oil system of steam turbine. A dual pump system is adopted. One is usually operating and the other is stand-by. The type of control oil pump is the variable displacement piston type, driven by AC motor.

They are installed beside the control oil tank. The control oil is discharged from the pump outlet, and flows through the line filter, stop valve and check valve. A part of control oil flows back to the control oil tank through the polishing filter and control oil cooling fan. The rest of it is fed to EH actuators of main stop valve and steam control valves after it is filtered through the last chance filter.

Supplying high pressure oil to EH actuators to control and to move following valves.

  1. Main stop valve (MSV)
  2. Main steam control valves (MCV)
  3. Admission steam stop valve (ASV)
  4. Admission steam control valve (ACV)
    Note
  • High pressure oil (145 bar) is used for control oil system.
  1. Control Oil Tank
    Capacity (at normal operating level) 310 L
    (max. capability) 500 L
    Level Alarm Low (254 L)
    Number of set 1
  2. Control oil pumps
    Type : AC Motor driven variable
    displacement plunger
    Capacity 26.06 L/min
    Pressure 145 barg
    Speed (synchronous) 1,000 rpm
    Number of sets: 2 (including stand-by)
  3. Control oil radiator
    Type : Air cooled fan
    Duty Approx.: 4 kW
    Number of sets 1
  4. Control oil tank heater
    Type : Electric immersion heater
    Size 2 kW
    Number of set 1
  5. COP suction filter
    Filtration 150 mesh
    Number of set 2
  6. COP discharge filter
    Filtration 15 μm (c)
    Number of sets 2
  7. Polishing filter
    Filtration 5 μm (c)
    Number of set 1
  8. Last chance filter
    Filtration 15 μm (c)
    Number of set 1
  9. Accumulator
    Type : Nitrogen Gas charged Bladder
    Size 40 L
    Gas charge pressure 83 barg (at 20 ºC)
    Number of set 1

Control Oil Tank

Function

  • Storage of control oil
  • Preventing dust being mixed from the atmosphere into the tank
  • Sedimentation of the contaminants in control oil
    Note
  • The capacity is 310 L at normal operating oil level.
  • Sampling port is arranged on the side of the tank to check the cleanliness of control oil periodically

Control Oil Pumps

Function

Supplying high pressure oil from control oil tank to EH actuators for MSV, MCV, ASV, ACV.
Note

  • The discharge capacity can be changed corresponding to the variation of the oil flow rate for EH actuators.
  • Two 100% capacity AC motor-driven COP are operated alternately. (One for stand-by)
  • The stand-by COP starts up automatically when the operating COP is tripped or the discharge pressure decreases under the LOW setting value (103 barg).
  • If stand-by COP would not start automatically, start it immediately by manual push button.

Control Oil Accumulator

Function

To keep the control oil pressure when a large amount of control oil would be momentarily used for EH actuators in case of large load reduction etc.
Note

  • This accumulator is bladder type, same type as the one for lube oil system.
  • It shall be necessary to check the pressure of accumulator periodically for keeping the controllability of steam turbine.
  • If the pressure would be less than the lower limit, charge N2 gas to accumulator up to the permissible range.

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