43
6 Commissioning and startup
6
.5 Combustion analysis
For safe and economic operation of the plant, flue gas measurements are essential
when commissioning.
The maximum CO
2
content for various gases can be obtained from the gas suppliers.
Example:
With 15% excess air (λ = 1.15) and 12% CO
2
max. a test value of
CO
2
=
12
= 10.4 % should be reached.
1.15
The CO content must not be more than 0.005 % Vol. (50 ppm).
Flue gas temperature for high fire is the result of burner setting at nominal firing rate.
Flue gas temperature for low fire is the result of control range adjustment.
The instructions of the manufacturer are to be followed strictly. On hot water boiler
installations, low fire is normally set to 50 ... 65% of the high fire rating (some of the data
may be on the boiler rating plate).
On air heater installations, the low fire is normally even higher. Again, the instructions of
the manufacturer should be closely followed.
The flue gas installation should also be set out to protect against damage through
condensation (excluding acid-proof chimneys).
Installation and Operating Instructions
G
as burner WG20.../1-C ZM-LN (W-FM 25)
83055116 • 1/2016-05
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