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Project planning information > Flue gas channelling
6 .8 .2 Direct heating
The eductors for flue gas extraction via the burner ECOMAX
cannot be used for furnace pressure control. For direct heat-
ing, we recommend discharging 10 to 15% of the flue gases
via an additional flue gas opening on the furnace fitted with
a furnace pressure control system.
In normal cases, for 90% of flue gas extraction, a low positive
pressure of between 0.1 and 0.3 mbar can be maintained in
the furnace chamber. In the case of heavily leaking furnaces,
flue gas extraction must be reduced, where necessary, to
avoid pulling in cold air due to negative pressure in the fur-
nace chamber.
Flue gas extraction via the burner is adjusted based upon the
negative pressure measured on the eductor.
If the furnace temperature is too high, damage can occur
to burners which are switched off due to the flow of hot flue
gases over them.
ECOMAX · Edition 02.11
For furnace temperatures ≥ 1000°C, it is recommended that
eductors with a mechanical flue gas valve (AGK) are used to
avoid these excessive temperatures.
The flue gas system on the furnace should be fitted flush with
the eductor (± 10 mm). The diameter of the flue gas pipe on the
furnace should be twice the eductor diameter P. If the diameter is
too small, even with the flue gas valve there is the danger of hot
flue gases creeping through the burner when it is switched off.
∅2P
∅P
ECOMAX 0
ECOMAX 1
ECOMAX 2
ECOMAX 3
ECOMAX 4
ECOMAX 5
ECOMAX 6
35
∅2P
∅P
∅ P [mm]
43
43
73
79
98
98
137
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