Krom Schroder BCU 560 Technical Information page 29

menox® low NOx mode > System structure and function
Flame mode
In order to heat up the furnace, the burner operates in flame
mode.
The ignitable gas/air mixture is ignited using an electrical
ignition spark and combusts inside and outside of the ce-
ramic burner tube. The presence of the flame is monitored in
compliance with EN 746-2.
menox ® mode
As soon as the combustion chamber temperature is ≥ 850°C,
the burner control unit BCU..D2 can switch to menox
Gas and air are supplied through the same connections as in
flame mode. No ignition takes place in the burner tube. The
combustion process is relocated to the combustion chamber.
The oxidation reactions take place without a visible flame.
Compared to traditional flame mode, the reaction zone is
BCU 560, BCU 565 · Edition 02.16
considerably larger and the reaction density considerably
lower. This prevents the occurrence of peak temperatures
which are responsible for high NO
are drastically reduced.
400
Natural gas, air preheating to 450°C
300
200
100
0
850
In menox ® mode, NO
® mode.
150 mg/m³ (reference value of 5% O
perature of 1200°C and hot air at 450°C – without expensive
additional piping. The high output pulse frequency and rotary
impulse control ensure temperature uniformity which is of
great advantage.
For further information on burner BIC..M,
see www.docuthek.com
values. Emissions of NO
x
900 950 1000 1050 1100
Furnace temperature [°C]
values can be reduced to below
x
) even at a furnace tem-
2
x
1150 1200 1250
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