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 probably 

-  and at part load.

 Flue Gas Data at
10% excess air (2% O2)
at 50% - 100% load		 Flue Gas Data at
20% excess air (4% O2)
at 50% - 100% load

Outlet 
Temperature

°C

 Flue Gas Amount 
kg/h

per kW load

Outlet 
Temperature

°C

 Flue Gas Amount 
kg/h

per kW load
  

  
88%
86%


 -2% 

+2%


 Heating Media :
 
 Low temp. < 150°C
 High temp. > 150°C
  
  
 Dirty condition  

 50% part load


294
340


+ 50

- 50


1,6506
1,6902


+ 0,04

- 0,04


269
311


+ 40

- 40


1,8162
1,8594


+ 0,05

- 0,04
The above data 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 (1,8594+0,05-0,04) = 935 kg/h flue gas at temperature of  311+40-40 = 311°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% O2)
at 50% - 100% load 		Flue Gas Data at
20% excess air (4% O2)
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