Steam turbine ntpc seepat bilaspur chhattisgarh

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steam turbine NTPC seepat bilaspur chhattisgarh

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Steam turbine ntpc seepat bilaspur chhattisgarh

  1. 1. presented BY :Pratik gupta (eee 5TH SEM )
  2. 2. Steam turbine
  3. 3. What exactly is the turbine? Turbine is an engine that converts energy of fluid into mechanical energy The steam turbine is steam driven rotary engine.
  4. 4. Principle of steam turbine: The steam energy is converted mechanical work by expansion through the turbine.  Expansion takes place through a series of fixed blades(nozzles) and moving blades.  In each row fixed blade and moving blade are called stage. 
  5. 5. WORK IN A TURBINE VISUALIZED
  6. 6. Steam turbine: Steam Turbine System: • Widely used in CHP(combined heat and power) applications. • Oldest prime mover technology • Capacities: 50 kW to hundreds of MWs • Thermodynamic cycle is the “Rankin cycle” that uses a boiler • Most common types • Back pressure steam turbine • Extraction condensing steam turbine 6
  7. 7. Steam turbine: Back Pressure Steam Turbine • Steam exits the turbine at a higher pressure that the atmospheric HP Steam Boiler Advantages: -Simple configuration -Low capital cost -Low need of cooling water -High total efficiency Turbine Fuel Condensate Process LP Steam Disadvantages: -Larger steam turbine Figure: Back pressure steam turbine 7
  8. 8. Steam turbine: Extraction Condensing Steam Turbine HP Steam • Steam obtained by extraction from an intermediate stage • Remaining steam is exhausted • Relatively high capital cost, lower total efficiency Boiler Turbine Fuel LP Steam Condensate Process Condenser Figure: Extraction condensing steam turbine 8
  9. 9. steam turbine and blades
  10. 10. STEAM TURBINE 500 MW  Generator rated speed 3000  Generator manufacturer BHEL  No. of bleedings 6  No. of bearings 7  rpm No. of stages  HPT 17 (All Reaction)  IPT 12x2 ( All Reaction)  LPT 6x2 (All Reaction)  Total 53  Inlet Steam Pr: 166 ksc  Inlet Steam Temp: 540 Deg C
  11. 11. STEAM TURBINE 600 MW  Generator rated speed 3000 rpm  Generator manufacturer Electrosila  No. of bleedings 8  Length of the turbine 36.362 m  No. of stages  HPT 17 ( 1st Impulse & rest Reaction)  IPT 11x2 ( All impulse)  LPT-1 5x2 ( All impulse)  LPT-2 5x2 ( All impulse)  Total 59  Inlet Steam Pr: 247 Ksc  Inlet Steam Temp: 537 Deg C
  12. 12. Types of steam turbine: There are two main types 1. Impulse steam turbine 2. Reaction steam turbine 
  13. 13. Impulse steam turbine: The basic idea of an impulse turbine is that a jet of steam from a fixed nozzle pushes against the rotor blades and impels them forward.  The velocity of steam is twice as fast as the velocity of blade.  Pressure drops take place in the fixed blade (nozzle). 
  14. 14. PRESSURE-VELOCITY DIAGRAM FOR A MOVING IMPULSE BLADE DIRECTION OF SPIN REPRESENTS MOVING IMPULSE BLADES PRESSURE TURBINE SHAFT ENTRANCE HIGH VELOCITY STEAM INLET EXIT LOW VELOCITY STEAM EXHAUST VELOCITY PES 14
  15. 15. IMPULSE TURBINE PRINCIPLE ROTOR NOZZLE STEAM CHEST PES 15
  16. 16. Reaction steam turbine: A reaction turbine utilizes a jet of steam that flows from a nozzle on the rotor.  Actually, the steam is directed into the moving blades by fixed blades designed to expand the steam.  The result is a small increase in velocity over that of the moving blades. 
  17. 17. PRESSURE-VELOCITY DIAGRAM FOR A MOVING REACTION BLADE DIRECTION OF SPIN REPRESENTS MOVING REACTION BLADES PRESSURE TURBINE SHAFT ENTRANCE HIGH PRESSURE HIGH VELOCITY STEAM INLET EXIT LOW PRESSURE LOW VELOCITY STEAM EXHAUST VELOCITY PES 17
  18. 18. REACTION TURBINE PRINCIPLE ROTOR STEAM CHEST PES 18
  19. 19. Schematic diagram:
  20. 20. Problems in steam turbine: Stress corrosion carking  Corrosion fatigue  Pitting  Oil lubrication  imbalance of the rotor can lead to vibration  misalignment  Thermal fatigue 
  21. 21. Thank you

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