boiler losses

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Presentation Transcript

BOILER LOSSES :

BOILER LOSSES SHIVAJI CHOUDHURY

BOILER LOSSES:

BOILER LOSSES 1.Moisture losses 2.Dry gas losses 3.Incomplete combustion 4.Radiation losses

1.MOISTURE LOSSES:

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

2.DRY LOSSES:

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

2.1.BOILER CASING AIR LEAKAGE:

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 )

2.2.AIR PRE HEATER LEAKAGE:

2.2.AIR PRE HEATER LEAKAGE Decreased avg cold end temp Increased air heater and normal O2 at boiler exit

2.3.INCORRECT FUEL TO AIR RATIO:

2.3.INCORRECT FUEL TO AIR RATIO High O2 at boiler exit Incorrect combustion control signals.

2.4.FOULED HEAT TRANSFER SURFACES:

2.4.FOULED HEAT TRANSFER SURFACES Boiler water walls Increased main steam temperature Super heater Decreased main steam temperature Re heater Decreased re heater temperature Economizer Decreased in economizer out temp Increase in main steam temp Air pre heater Low exit air temp Normal inlet gas and air temp

3.INCOMPLETE COMBUSTION:

3.INCOMPLETE COMBUSTION SYMPTOM Unburned carbon loss CAUSE Coal quality Increased carbon content Increased ash content Burner tips plugged Burner damper setting Improper aux to burner air ratio Incorrect fuel to air ratio Decrease in mill fineness

3.1.DECREASE IN MILL FINENESS :

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

4.RADITION LOSSES:

4.RADITION LOSSES Boiler skin temp >25 deg C above ambient air temperature Surface air velocity HI ( > design value )

Losses in Thermal Power Plant:

Losses in Thermal Power Plant

SUPER CRITICAL BOILER:

SUPER CRITICAL BOILER

THANKING YOU:

THANKING YOU

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