Flue Gas Conditions

depending on load, efficiencies and burner adjustment

 

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Efficiencies 

-  at different heating media temperatures
   (steam, thermal oil etc.)

-  when boilers is not clean (fouling) 

-  and at part load.
Flue Gas Data at
10% excess air (~2% O2)
at 50% to 100% load
Flue Gas Data at
20% excess air (~4% O2)
at 50% to 100% load
Outlet 
Temperature

°C
Flue Gas Amount 
kg/h

per kW load (output)
Outlet 
Temperature

°C
Flue Gas Amount 
kg/h

per kW load (output)
  
Efficiencies
  
88% - 93%
85% - 88%



 -1 to -2% 


+1 to + 2%


 Heating Media :
 
 Low temperatures < 250°C
 High temperatures > 250°C
 
 
  
 Dirty condition  


 50% part load




230 - 300
320 - 370



+ 50


- 50



1,6
1,7



+ 0,1


- 0,1



200 - 250
290 - 340



+ 50


-  50



1,8
1,9



+ 0,1


-  0,1

The above data are estimated value only - and can be used for Utilizing Waste Heat in the flue gas - in Economizers etc

Example:   
1000 kW steam boiler 180°C steam temperature at 50% part load, dirty condition and an oxygen % at 4% on the burner gives:
1000 x 0,5 x (1,8+0,1-0,1) = 900 kg/h flue gas at temperature of approximately  (230+300)/2+50-50 ~ 265°C (+/- 35°C)

Read more about
Waste Heat Recovery and Economizers.

 

 

    tools for thermal engineers