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STARTUP OF A GAS TURBINE
2×GE FRAME 9FA GAS TURBINE
750MW COMBINED CYCLE
POWER PLANT
Why a starting mean is required to start a gas
turbine?
• Like other internal combustion engines, a gas turbine cannot
pro...
Depending on the plant and the type of Gas turbine
starting means are classified as follows:
Gas
turbine
Generator
Diesel
...
Generator
Diesel engine
Why starting mean require Torque converter
• Acceleration to purge speed.
• Acceleration to firing speed.
• Assisting the ...
Motor with torque converter
Hydraulic Oil Pump
Accessory
Drive Gear
Torque
Converter
Why Turning gear mechanism is required?
• The turning gear provides the power necessary to breakaway
and rotate the turbin...
Turning gear mechanism
Why SSS Clutch is required in starting operation
of turbine?
• Its an over running clutch for automatic engagement
and dis...
The most commonly used type of clutch is SSS
(Synchronous Self Shifting ) Clutch.
SSS clutch working
Electrical to mechanical power conversion
Exhaust
Rotating
shaft
Generator
Gas turbine
Grid
TransformerPumps
Starting
appa...
Start up curve of gas turbine
Why post and pre lubrication is required during
startup and shutdown of gas turbine?
• Gas turbine lubrication is started ...
Accessory
Coupling
Active
Thrust
Inactive
Thrust
No # 1
Journal
Bearing
Load
Coupling
Load
Equipment
Coupling
Oil
Lube Oil...
STARTUP STEPS
 Purging
 Warming up time
 Auxiliary lube/hydraulic oil pump and Ratchet motor
start, Jaw clutch will eng...
STARTUP SCREEN WITH MASTER CONTROL
START AND STOP OPTION
Why start check screen is required?
• In order to ensure the successful start up of a gas
turbine all the axillaries and o...
Start check screen with READY TO START signal.
Instructor station with dialog box questioning whether to Start the Turbine
Start check screen with NOT READY TO START status
STARTUP SCREEN WITH READY TO START STATUS
What is Cranking? Why cranking is required?
• Its a process during which a gas turbine is made to run at a
required speed ...
STARTUP STATUS – CRANKING
Why purge timer is required?
• Depending on the type of fuel and based on the
type of start (fast start or normal start) p...
Why Warming up of a gas turbine is required?
• In order to have low cycle fatigue on hot gas components.
they are internal...
STARTUP STATUS – WARMING UP
What is Firing of a gas turbine?
• When admission of fuel in the combustion chamber takes place
firing occurs.
• During th...
STARTUP STATUS – FIRING
STARTUP STATUS – ACCELERATING
RUN STATUS – FSNL
RUN STATUS – COMPLETE SEQUENCE
RUN STATUS – LOADING
CLOSED
RUN STATUS – LOADING
CLOSED
RUN STATUS – BASE LOAD
CLOSED
Why Emergency stop system is required
• Whenever an abnormal functioning of gas turbine is
observed during the field strok...
Emergency stop system
Thank you
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Overview of Start-up of Gas Turbine.

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An overview of start up means for Gas turbine and real-time simulator HMI screens indicating the full start-up of Gas turbine till it reaches full speed no load (FSNL), Start-up curve, Relays that get activated at the corresponding speed and Emergency stop system.

Publicado en: Ingeniería

Overview of Start-up of Gas Turbine.

  1. 1. STARTUP OF A GAS TURBINE 2×GE FRAME 9FA GAS TURBINE 750MW COMBINED CYCLE POWER PLANT
  2. 2. Why a starting mean is required to start a gas turbine? • Like other internal combustion engines, a gas turbine cannot produce torque at zero speed. • The starting mean system is used to start the gas turbine rolling, crank it to firing speed and assist the fired turbine to self-sustaining speed. • This is accomplished by a motor, generator or other starting device operating through a torque converter coupled to the accessory gear. • This arrangement provides the cranking torque for turbine start-up and during shutdown this continues to rotate the turbine rotor at slow speed for cool down purposes.
  3. 3. Depending on the plant and the type of Gas turbine starting means are classified as follows: Gas turbine Generator Diesel engine Motor
  4. 4. Generator
  5. 5. Diesel engine
  6. 6. Why starting mean require Torque converter • Acceleration to purge speed. • Acceleration to firing speed. • Assisting the gas turbine till it reaches self sustained speed.
  7. 7. Motor with torque converter Hydraulic Oil Pump Accessory Drive Gear Torque Converter
  8. 8. Why Turning gear mechanism is required? • The turning gear provides the power necessary to breakaway and rotate the turbine prior to turbine start and also to rotate the shafting after turbine shutdown to avoid deformation of it shafting's.
  9. 9. Turning gear mechanism
  10. 10. Why SSS Clutch is required in starting operation of turbine? • Its an over running clutch for automatic engagement and disengagement. • It is a self engaging in breakaway or turning mode and over runs when turbine/generator shafting speed exceeds turning gear drive packaged speed.
  11. 11. The most commonly used type of clutch is SSS (Synchronous Self Shifting ) Clutch. SSS clutch working
  12. 12. Electrical to mechanical power conversion Exhaust Rotating shaft Generator Gas turbine Grid TransformerPumps Starting apparatus • If a Generator is selected as a starting mean then it behaves like a motor and draws current from the Grid to perform the startup operation of a gas turbine .
  13. 13. Start up curve of gas turbine
  14. 14. Why post and pre lubrication is required during startup and shutdown of gas turbine? • Gas turbine lubrication is started before the actual start up and after shutdown for a short period of time to ensure effective lubrication of the gas turbine parts and increase the performance of the gas turbine parts.
  15. 15. Accessory Coupling Active Thrust Inactive Thrust No # 1 Journal Bearing Load Coupling Load Equipment Coupling Oil Lube Oil Drain to Reservoir Bearing Oil No # 2 Journal Bearing
  16. 16. STARTUP STEPS  Purging  Warming up time  Auxiliary lube/hydraulic oil pump and Ratchet motor start, Jaw clutch will engage, Diesel engine start START (14HR(0% SPEED) CRANKING 14HM(20% SPEED) FIRE (UPTO 50% SPEED)  At 60% speed Diesel engine disengage and shutdown ACCELERATE 14HA(50% SPEED)  At 95% speed aux lube/hydraulic oil pump stop, bleed valves closes FSNL 14HS(95% SPEED)
  17. 17. STARTUP SCREEN WITH MASTER CONTROL START AND STOP OPTION
  18. 18. Why start check screen is required? • In order to ensure the successful start up of a gas turbine all the axillaries and other compartments are to be checked. • This is ensured with the help of a start check screen which gives the status of the auxiliaries with a green signal that indicate the proper state to start the gas turbine.
  19. 19. Start check screen with READY TO START signal.
  20. 20. Instructor station with dialog box questioning whether to Start the Turbine
  21. 21. Start check screen with NOT READY TO START status
  22. 22. STARTUP SCREEN WITH READY TO START STATUS
  23. 23. What is Cranking? Why cranking is required? • Its a process during which a gas turbine is made to run at a required speed during start up and shutdown operation, in order to prevent turbine rotor undergoing hogging and sagging.
  24. 24. STARTUP STATUS – CRANKING
  25. 25. Why purge timer is required? • Depending on the type of fuel and based on the type of start (fast start or normal start) purge time is fixed • Purging is required to flush out and choke out liquid fuel nozzles which may have traces and residues which are left out in the combustion chamber, after the shutdown operation of gas turbine. • Depending on the type of fuel used in combustion chamber the purge timer is set.
  26. 26. Why Warming up of a gas turbine is required? • In order to have low cycle fatigue on hot gas components. they are internally heated and are exposed to a constant temperature . • Sudden heating and cooling of hot gas components is not recommended, so warming up of hot gas components is carried out
  27. 27. STARTUP STATUS – WARMING UP
  28. 28. What is Firing of a gas turbine? • When admission of fuel in the combustion chamber takes place firing occurs. • During this period of time the gas turbine will have firing status.
  29. 29. STARTUP STATUS – FIRING
  30. 30. STARTUP STATUS – ACCELERATING
  31. 31. RUN STATUS – FSNL
  32. 32. RUN STATUS – COMPLETE SEQUENCE
  33. 33. RUN STATUS – LOADING CLOSED
  34. 34. RUN STATUS – LOADING CLOSED
  35. 35. RUN STATUS – BASE LOAD CLOSED
  36. 36. Why Emergency stop system is required • Whenever an abnormal functioning of gas turbine is observed during the field stroking operation, then the gas turbine can be immediately stopped using the emergency stop system.
  37. 37. Emergency stop system
  38. 38. Thank you

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