Flue Gas Analysis Table
Introduction
Operation
Using a Flue Gas Analyzer or any meter designed to measure oxygen or carbon-monoxide, and taking the flue gas temperature and the temperature of the combustion air, the following Table can be used to determine combustion efficiency when operating on natural gas. The Temperature Column is the NET Difference between Flue Gas and Combustion Air Temperatures.
(Flue Gas Temp -minus- Combustion Air Temp)
Note that each fuel has its own characteristics. Therefore, these numbers are valid ONLY for natural gas.
Read Combustion Efficiency in the Column under the NET Temperature Difference, in the row for the measured O2% or CO2%.
|
Excess Air % |
Excess O2 % |
Excess CO2 % |
Combustion Efficiency at Net Temperature Difference |
||||||||
|
170F |
220F |
270F |
330F |
380F |
430F |
480F |
530F |
580F |
|||
|
0.0 |
0.0 |
11.8 |
86.3 |
85.3 |
84.2 |
83.0 |
81.9 |
80.8 |
79.7 |
78.6 |
77.5 |
|
4.5 |
1.0 |
11.2 |
86.2 |
85.1 |
84.0 |
82.7 |
81.6 |
80.5 |
79.3 |
78.2 |
77.0 |
|
9.5 |
2.0 |
10.7 |
86.1 |
84.9 |
83.8 |
82.4 |
81.2 |
80.1 |
78.9 |
77.7 |
76.5 |
|
15.0 |
3.0 |
10.1 |
85.9 |
84.7 |
83.5 |
82.1 |
80.9 |
79.7 |
78.4 |
77.2 |
75.9 |
|
21.1 |
4.0 |
9.6 |
85.7 |
84.5 |
83.2 |
81.7 |
80.5 |
79.2 |
77.9 |
76.6 |
75.3 |
|
28.1 |
5.0 |
9.0 |
85.5 |
84.2 |
82.9 |
81.3 |
80.0 |
78.6 |
77.3 |
75.9 |
74.5 |
|
35.9 |
6.0 |
8.4 |
85.3 |
83.9 |
82.5 |
80.9 |
79.5 |
78.0 |
76.6 |
75.2 |
73.7 |
|
44.9 |
7.0 |
7.9 |
85.0 |
83.5 |
82.1 |
80.3 |
78.8 |
77.3 |
75.8 |
74.3 |
72.8 |
|
55.3 |
8.0 |
7.3 |
84.7 |
83.1 |
81.6 |
79.7 |
78.1 |
76.6 |
74.9 |
73.3 |
71.7 |
|
67.3 |
9.0 |
6.7 |
84.3 |
82.7 |
81.0 |
79.0 |
77.3 |
75.6 |
73.9 |
72.2 |
70.4 |
|
81.6 |
10.0 |
6.2 |
83.9 |
82.1 |
80.3 |
78.2 |
76.4 |
74.5 |
72.7 |
70.8 |
68.9 |
|
98.7 |
11.0 |
5.6 |
83.4 |
81.5 |
79.5 |
77.2 |
75.2 |
73.2 |
71.2 |
69.2 |
67.1 |
|
119.7 |
12.0 |
5.1 |
82.7 |
80.6 |
78.5 |
75.9 |
73.8 |
71.6 |
69.4 |
67.2 |
64.9 |
|
145.8 |
13.0 |
4.5 |
82.0 |
79.6 |
77.3 |
74.4 |
72.0 |
69.6 |
67.1 |
64.7 |
62.2 |
|
179.5 |
14.0 |
3.9 |
81.0 |
78.3 |
75.7 |
72.4 |
69.7 |
67.0 |
64.2 |
61.5 |
58.7 |
|
224.3 |
15.0 |
3.4 |
79.6 |
76.6 |
73.5 |
69.8 |
66.7 |
63.5 |
60.4 |
57.2 |
54.0 |
Source: Table extracted from: Boiler Efficiency Institute, “Boiler Efficiency Improvement” by David F. Dyer and Glennon Maples, Copyright 1991.
More Information
Source: Table extracted from: Boiler Efficiency Institute, “Boiler Efficiency Improvement” by David F. Dyer and Glennon Maples, Copyright 1991.