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How to read the burner "Performance curve"
The procedure for matching a burner and evaluating the achievable emissions from a thermal unit can be broken down into a few sim-
ple steps.The first step is the approximate choice of burner, considering the operating point with reference to burner performance.Then,
with reference to the desired NOx emissions, the O
verified by considering the right curve among the three noted in the diagram.
To choose the proper burner, the following data
are necessarily required:
Boiler type(inversion/passing, hot water/
steam...)
Burner input
Backpressure in the combustion chamber
Dimensions of the combustion chamber inclu-
ded the reverse smoke chamber
NOx emissions requested
Choosing the burner
To clearly explain the procedure about choosing
a suitable burner, please follow the example:
Boiler type 3 pass
Furnace input 1300 kW
Backpressure in the combustion chamber 10
mbar
NOx target 15 ppm @ 3% O
kWh)
Each performance curve is identified by the O
tent in the smokes 5% 6% 7%.
Increasing he O
content, the burner output decrea-
2
ses, so the performance curves.
A rough choice suggests a G200N burner could be a
right choice.
From the O
/ NOX diagram determinate the O
2
tent in the smokes, so the O
the performance curve. In our example, to have NOx
= 15 ppm @3% O
, we expect 6,4 % O
2
We will consider the curve (7) in the G200N perfor-
mance curve diagram.
The required operating point (1300 kW at 10 mbar) is
inside of G200N performance curve when O
at the stack.
G200N is the right choice.
PART II: NOTES FOR THE INSTALLER
PART II: NOTES FOR THE INSTALLER
concentration in the flue gas is determined.Finally, the correct choice of burner is
2
(about 30 mg/
2
con-
2
con-
2
curve of reference of
2
at the stack.
2
is 7%
2
14
12
10
8
6
4
2
0
100
300
500
700
11
900
1100
1300
1500
Power [kW]
Power [kW]
1700
1900
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