16
Fine tuning – Boiler excess air control
Boiler no.1
3000 lbs/hr
Furnace oil
Temp: Above 120 degC
Air
Temp: 30 Deg C
Feed Water
Temp: 85 Deg C
Steam
Pr: 7 bar. G
Flue Gases
Temp: 247 Deg C
%O2; 11.8
%CO2: 6.7
CO: 1100 ppm
Boiler efficiency:   75.4%
Excess air:           120%
Dry Flue gas losses: 17.8%
Moisture losses:          5.2%
Radiation losses:       2 %
Blowdown losses: 0
Issues:
Very high Excess air (90-100%)
Very high flue gas temperature
Very high CO percentage
High FO temp
Before adjustment