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Slide 1: STEAM TURBINE HEAT RATE LOSSES SHIVAJI CHOUDHURY
Slide 2: TURBINE LOSSES     1.Mechanical damage 2.Flow area decrease 3.Flow area bypass 4.Flow area increase
Slide 3: 1.MECHANICAL DAMAGE    Symptoms Sudden change in section efficiency Sudden change in section pressure ratio   CAUSE Metallurgical defect  Maintenance practice
Slide 4: 2.FLOW AREA DECREASE     Symptoms Increase in press ratio Decrease in section efficiency Increase in up stream press      cause Mechanical blockage Sudden increase in press ratio Sudden decrease in section efficiency Sudden increase in upstream press     Blade deposits Gradual increase in press ratio Gradual decrease in section efficiency Gradual increase in upstream press
Slide 5: 3.FLOW AREA BYPASS     Symptoms    HP turbine inlet bushing leakage Main steam stop valve leakage HP gland seal leakage Decrease in HP efficiency Increase in leak off flow Increase in 3rd pt ext temperature Decrease in HP efficiency cause Decrease in section efficiency Decrease in pressure ratio Decrease in upstream pressure        Reheater stop /interceptor valve leakage IP turbine inlet bushing leakage Increase in 2nd pt ext temperature Increase in 2nd pt ext temperature  
Slide 6: 4.FLOW AREA INCREASE     Spill strip or packing leakage Erosion of turbine stage Solid practical erosion of nozzle blocks Block mechanical damage
Slide 7: SPILL STRIP PACKAGE LEAKAGE     Thermal stress Rubbing Operating procedure Vibration
Slide 8: SOLID PARTICLE EROSION OF NOZZLE BLOCKS   SYMPTOMS Increase in pressures downstream of first stage Increase in ratio of first stage to throttle pressure     Cause Condenser tube leakage Poor water chemistry
Slide 10: THANKING YOU