Combustion Efficiency Chart for Natural Gas
Power Burners
Recommended Ranges
|
Excess
Air |
% O2 |
% CO2 |
Net Stack Temperature — Degrees Fahrenheit |
||||||||||
|
300 |
320 | 340 | 360 | 380 | 400 | 420 | 440 | 460 | 480 | 500 | |||
| 9.5 | 2.0 | 10.7 | 83.1 |
82.6 |
82.2 |
81.7 |
81.2 |
80.8 |
80.3 | 79.8 | 79.4 |
78.9 |
78.4 |
| 12.1 |
2.5 |
1 |
83.0 | 82.5 | 82.0 | 81.5 | 81.1 | 80.6 | 80.1 | 79.6 | 79.1 | 78.7 |
78.2 |
| 15.0 | 3.0 | 10.1 | 82.8 |
82.3 |
81.8 |
81.4 |
80.9 |
80.4 |
79.9 |
79.4 |
78.9 |
78.4 |
77.9 |
|
21.1 |
4.0 |
9.6 |
82.5 |
82.0 |
81.5 |
81.0 |
80.5 |
79.9 |
79.4 |
78.9 |
78.4 |
77.9 |
77.4 |
|
24.5 |
4.5 |
9.3 |
82.3 |
81.1 |
81.3 |
80.8 |
80.2 |
79.7 |
79.2 |
78.7 |
78.1 |
77.6 |
77.1 |
|
28.1 |
5.0 |
9.0 |
82.1 |
81.6 |
81.1 | 80.5 | 80.0 | 79.5 |
78.9 |
78.4 | 77.8 | 77.3 | 76.7 |
| 31.9 | 5.5 |
8.7 |
81.9 |
81.4 |
80.8 |
80.3 |
79.7 |
79.2 | 78.6 | 78.1 |
77.5 |
77.0 | 76.4 |
|
35.9 |
6.0 |
8.4 |
81.7 | 81.1 | 80.6 | 80.0 |
79.5 |
78.9 | 78.3 |
77.8 |
77.2 | 76.6 |
76.0 |
|
40.3 |
6.5 |
8.2 |
81.5 |
80.9 | 80.3 | 79.7 |
79.2 |
78.6 | 78.0 |
77.4 |
76.8 |
76.2 | 75.6 |
| 44.9 | 7.0 | 7.9 |
81.2 |
80.6 |
80.0 |
79.4 |
78.8 | 78.2 |
77.6 |
77.0 |
76.4 |
75.8 | 75.2 |
Atmospheric Burners
|
Excess Air |
% O2 |
% CO2 |
Net Stack Temperature — Degrees Fahrenheit |
||||||||||
| 300 | 320 | 340 | 360 | 380 | 400 | 420 | 440 | 460 | 480 | 500 | |||
|
5.0 |
9.0 |
82.1 |
81.6 |
81.1 | 80.5 | 80.0 | 79.5 |
78.9 |
78.4 | 77.8 | 77.3 | 76.7 | |
| 31.9 | 5.5 |
8.7 |
81.9 |
81.4 |
80.8 |
80.3 |
79.7 |
79.2 | 78.6 | 78.1 |
77.5 |
77.0 | 76.4 |
|
35.9 |
6.0 |
8.4 |
81.7 | 81.1 | 80.6 | 80.0 |
79.5 |
78.9 | 78.3 |
77.8 |
77.2 | 76.6 |
76.0 |
|
40.3 |
6.5 |
8.2 |
81.5 |
80.9 | 80.3 | 79.7 |
79.2 |
78.6 | 78.0 |
77.4 |
76.8 |
76.2 | 75.6 |
| 44.9 | 7.0 | 7.9 |
81.2 |
80.6 |
80.0 |
79.4 |
78.8 | 78.2 |
77.6 |
77.0 |
76.4 |
75.8 | 75.2 |
| 49.9 | 7.5 | 7.6 | 80.9 | 80.3 | 79.7 | 79.1 | 78.5 | 77.9 | 77.3 | 76.7 | 76.0 | 75.4 | 74.8 |
| 55.3 | 8.0 | 7.3 | 80.7 | 80.0 | 79.4 | 78.8 | 78.1 | 77.5 | 76.9 | 76.2 | 75.6 | 74.9 | 74.3 |
| 61.1 | 8.5 | 7.0 | 80.4 | 79.7 | 79.1 | 78.4 | 77.8 | 77.1 | 76.4 | 75.8 | 75.1 | 74.4 | 73.8 |
| 67.3 | 9.0 | 6.7 | 80.0 | 79.3 | 78.7 | 78.0 | 77.3 | 76.6 | 76.0 | 75.3 | 74.6 | 73.9 | 73.2 |
Courtesy of The Boiler Institute