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Slide 1: BOILER LOSSES SHIVAJI CHOUDHURY
Slide 2: BOILER LOSSES     1.Moisture losses 2.Dry gas losses 3.Incomplete combustion 4.Radiation losses
Slide 3: 1.MOISTURE LOSSES    Coal quality Increased volatile matter Increased moisture       High moisture in air Tube leakage Increased make up Increased precipitated current draw Increased stack opacity Boiler walk down
Slide 4: 2.DRY LOSSES     2.1.Boiler casing leakage 2.2.Air pre heater leakage 2.3.Incorrect fuel to air ratio 2.4.Fouled heat transfer surfaces
Slide 5: 2.1.BOILER CASING AIR LEAKAGE    Decreased exit furnace temperature (Before econ) Low combustion air flow and normal O2 at furnace exit Decreased exit boiler temperature (after econ )
Slide 6: 2.2.AIR PRE HEATER LEAKAGE   Decreased avg cold end temp Increased air heater and normal O2 at boiler exit
Slide 7: 2.3.INCORRECT FUEL TO AIR RATIO   High O2 at boiler exit Incorrect combustion control signals.
Slide 8: 2.4.FOULED HEAT TRANSFER SURFACES   Boiler water walls Super heater Re heater Increased main steam temperature Decreased main steam temperature Decreased re heater temperature Decreased in economizer out temp Increase in main steam temp Low exit air temp Normal inlet gas and air temp        Economizer    Air pre heater
Slide 9: 3.INCOMPLETE COMBUSTION       SYMPTOM Unburned carbon loss CAUSE Coal quality Increased carbon content Increased ash content    Burner tips plugged Burner damper setting Decrease in mill fineness Improper aux to burner air ratio   Incorrect fuel to air ratio
Slide 10: 3.1.DECREASE IN MILL FINENESS         SYMPTOM Sieve test results: fineness < 70% thru 200 mesh. CAUSE Loss of roller tension Ring roller wear Classifier vane wear Exceeding mill capacity Classifier vane improperly adjusted
Slide 11: 4.RADITION LOSSES   Boiler skin temp >25 deg C above ambient air temperature Surface air velocity HI ( > design value )
Slide 12: Losses in Thermal Power Plant
Slide 13: SUPER CRITICAL BOILER
Slide 14: THANKING YOU