PPT On Turbine Rolling And Synchronization
Download
THE OBJECTIVE OF STARTING UP OF THE TURBOGENERATOR IS TO BRING A UNIT ON LOAD AND RAISE IT TO THE RATED OUTPUT WITHIN THE OPTIMUM TIME BUT WITHOUT UNDUE STRESSES ON THE TURBINE COMPONENTS.
2. TYPES OF START UP
Turbine Start up are classified as Cold, Hot & Warm Start up
3. General Preparation of Start up
All the repair works on the turbine are completed and all PTWs are cancelled.
All the Turbo-supervisory instruments are available.
Generator excitation system,GT & UAT cooling system,seal oil system etc.are OK
All the interlocks and protections of Turbine & Generator are already checked up and kept I/s.
4. Unit status before Turbine Rolling
Turbo-Generator on Burring gear with all Turbo supervisory parameters are normal.
Boiler is lighted up condition with one or two oil elevations are I/s.
HP-LP Bypass is in charged condition.
Boiler load index is 95 to 100 T/Hr.
Steam parameter are ready for rolling. M.S. Pr. 35-40 Ksc. HRH Pr. 12-14 Ksc. M.S. and HRH Tempr. – 320 to 3500C
5. Start up Considerations
During the startup the Turbine is subjected to “Non-Steady state operation”.
This covers the operating condn where Speed, steam Pressure and temperature change with time.
Under these condn turbine components which are exposed to temperature changes subjected to thermal stress and expansion.
For turbine life point of view, it is very much necessary to limit the extent of these temperature changes.
6. To take care of the above factor the operator has to follow the recommendations from Turbine Stress Evaluator and start the Rolling procedure by following Criteria curves X1 to X7 right from the beginning. TURBINE STRESS EVALUATOR
The Turbine is equipped with the TSE which provides adequate guidance to the operator by indicating tempr margins and Load margins.
These Margins have been derived on the basis of Actual Thermal Stress and Material Fatigue.
7. Frequent and substantial departures from criteria curves and TSE Indication can result
a.Reduction in total life of Turbine
b.Non permissible deformation. and
c.Cracking of Turbine Components.
8. RESETTING THE TURBINE
Why Turbine Resetting?
When the Turbine trips due to Electrical or Mechanical Protection Trip oil drains quickly. In the absence of the Trip oil Turbine Stop and Control vlvs closes quickly.
So the Trip oil is basically required for keeping the ESVs and IVs in open condn and getting required Secondary oil pressr for opening the HPCVs and IPCVs. .
9. The Trip oil again can be generated again by Resetting the Turbine.
Now to Reset the Turbine We have to
Reset the Unit Or Master Trip Relay.
Bring the Starting Device to Zero.
10. For more please refer our PPT. Thank You.
Download
Turbine Rolling And Synchronization
Presentation Transcript:
1. OBJECTIVETHE OBJECTIVE OF STARTING UP OF THE TURBOGENERATOR IS TO BRING A UNIT ON LOAD AND RAISE IT TO THE RATED OUTPUT WITHIN THE OPTIMUM TIME BUT WITHOUT UNDUE STRESSES ON THE TURBINE COMPONENTS.
2. TYPES OF START UP
Turbine Start up are classified as Cold, Hot & Warm Start up
3. General Preparation of Start up
All the repair works on the turbine are completed and all PTWs are cancelled.
All the Turbo-supervisory instruments are available.
Generator excitation system,GT & UAT cooling system,seal oil system etc.are OK
All the interlocks and protections of Turbine & Generator are already checked up and kept I/s.
4. Unit status before Turbine Rolling
Turbo-Generator on Burring gear with all Turbo supervisory parameters are normal.
Boiler is lighted up condition with one or two oil elevations are I/s.
HP-LP Bypass is in charged condition.
Boiler load index is 95 to 100 T/Hr.
Steam parameter are ready for rolling. M.S. Pr. 35-40 Ksc. HRH Pr. 12-14 Ksc. M.S. and HRH Tempr. – 320 to 3500C
5. Start up Considerations
During the startup the Turbine is subjected to “Non-Steady state operation”.
This covers the operating condn where Speed, steam Pressure and temperature change with time.
Under these condn turbine components which are exposed to temperature changes subjected to thermal stress and expansion.
For turbine life point of view, it is very much necessary to limit the extent of these temperature changes.
6. To take care of the above factor the operator has to follow the recommendations from Turbine Stress Evaluator and start the Rolling procedure by following Criteria curves X1 to X7 right from the beginning. TURBINE STRESS EVALUATOR
The Turbine is equipped with the TSE which provides adequate guidance to the operator by indicating tempr margins and Load margins.
These Margins have been derived on the basis of Actual Thermal Stress and Material Fatigue.
7. Frequent and substantial departures from criteria curves and TSE Indication can result
a.Reduction in total life of Turbine
b.Non permissible deformation. and
c.Cracking of Turbine Components.
8. RESETTING THE TURBINE
Why Turbine Resetting?
When the Turbine trips due to Electrical or Mechanical Protection Trip oil drains quickly. In the absence of the Trip oil Turbine Stop and Control vlvs closes quickly.
So the Trip oil is basically required for keeping the ESVs and IVs in open condn and getting required Secondary oil pressr for opening the HPCVs and IPCVs. .
9. The Trip oil again can be generated again by Resetting the Turbine.
Now to Reset the Turbine We have to
Reset the Unit Or Master Trip Relay.
Bring the Starting Device to Zero.
10. For more please refer our PPT. Thank You.
No comments:
Post a Comment