Flue Gas Conditions

depending on load, efficiencies and burner adjustment

 

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 the 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.

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UNDER CONSTRUCTION - UNDER UDARBEJDELSE

Ultra Compact Steam Generators     ·    Marine Steam Generators                   Determine the flue gas arrangement

Type DT
[Size  /  kg/h]

Heat
Capacity
[kW]

Efficiency at
50% - 100% load
%
Flue Gas Data at
10% excess air (2% O
2)
at 50% - 100% load
Flue Gas Data at
20% excess air (4% O
2)
at 50% - 100% load

Outlet 
Temperature
°C

Flue Gas Amount 
kg/h

Outlet 
Temperature
°C

Flue Gas Amount 
kg/h
      90%
  88%
  86%
  84%

  Part Load
  Low temperatures
  High temperatures
  Dirty condition

249
294
340
386
1,6146
1,6506
1,6902
1,7298
pr. kW
228
269
311
352
1,7766
1,8162
1,8594
1,9044
pr. kW
300 / 400 278 90% - 88%        
400 / 600 417 90% - 88%        
600 / 800 556 90% - 88%        
800 / 1000 695 90% - 88%        
1000 / 1250 869 90% - 88%        
1200 / 1500 1.043 90% - 88%        
1500 / 1800 1.390 90% - 88%        
2000 / 2500 1.738 90% - 88%        
2500 / 3000 1.800 90% - 88%        
3000 / 4000 2.781 90% - 88%        
4000 / 5000 3.476 90% - 88%        
5000 / 6000 4.200 90% - 88%        

 

 

 

 

 

Virkn. grad

1,09 / 2 %

kg/h pr. kW

1,21 / 4 %

kg/h pr. kW

         

84

386

1,7298

352

1,9044

         

86

340

1,6902

311

1,8594

         

88

294

1,6506

269

1,8162

         

89

271

1,6326

248

1,7964

         

90

249

1,6146

228

1,7766