dry heat losses in boiler

DRY FLUE GASES LOSSES IN BOILER : 

DRY FLUE GASES LOSSES IN BOILER SHIVAJI CHOUDHURY

BOILER LOSSES : 

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

DRY GAS LOSS : 

DRY GAS LOSS High excess air and lower heat absorption in the boiler system can cause exit gas temperature higher than expected resulting dry gas loss. A 22 deg C rise in exit temperature can rise the heat rate one percent.

LOSSES IN BOILER –Design (IN PERCENT )210 MW THERMAL POWER PLANT( AS PER BS 2886)at 100% TMCR 210 MW : 

LOSSES IN BOILER –Design (IN PERCENT )210 MW THERMAL POWER PLANT( AS PER BS 2886)at 100% TMCR 210 MW DRY GAS- 5.1 H2O AND H2 IN FUEL 6.16 H2O IN AIR 0.15 UNBURN CARBON 1.2 RADIATION 0.22 UNACCOUNTED 0.53 MANUFACTURER MARGIN 1.00 TOTAL LOSSES 14.36

LOSSES IN BOILER –Design (IN PERCENT )500 MW THERMAL POWER PLANT( AS PER BS 2886)at 100% TMCR 500 MW : 

LOSSES IN BOILER –Design (IN PERCENT )500 MW THERMAL POWER PLANT( AS PER BS 2886)at 100% TMCR 500 MW DRY GAS- 4.32 H2O IN FUEL 2.15 H2O FROM COMP OF H2 3.68 H2O IN AIR 0.11 UNBURN CARBON 1.50 RADIATION 0.12 UNACCOUNTED 0.76 TOTAL LOSSES 12.64

CAUSE OF DEVIATION : 

CAUSE OF DEVIATION Excess air In leakage from bottom hopper air preheater/ESP inlet door leakage /open Excess mill tempering air due to low mill temperature Incorrect operation of pre warming airpreheater inlet air Air preheater bypass dampers open Poor mill performance Poor preheater efficiency- plugage/fouled; corroded/eroded Oxygen measurement calibration Correct on of mills in service for given load Excess furnace draft (higher draft is worst for in leakage )

OPERATOR CONTROLLABLE : 

OPERATOR CONTROLLABLE Reduce excess air Ensure hopper ,slag ports etc closed tightly Adjust mill primary air Achieve design mill outlet temperature or more Proper soot blowing for air reheater Proper operation of steam coil to prevent fouling and corrosion Proper soot blowing for boiler Proper number of mills in service

MAINTENANCE CORRECTABLE : 

MAINTENANCE CORRECTABLE Repair expansion joints, door gaskets on hoppers and preheater seals. Repair/replace preheater baskets Mill maintenance.

AIR PRE HEATER : 

AIR PRE HEATER

AIR PRE HEATER : 

AIR PRE HEATER

LOSSES IN THERMAL POWER PLANT IN INDIA : 

LOSSES IN THERMAL POWER PLANT IN INDIA

THANKING YOU : 

THANKING YOU