Flue Gas Eductor Ejek - Honeywell Ecomax Series Technical Information

Project planning information for direct heating

6 .3 Flue gas eductor EJEK

Flue gas eductor EJEK is available in 2 versions. The
standard version EJEK is used in conjunction with
ECOMAX..M and ECOMAX..F. The high temperature
version EJEK..-HT is intended for use in conjunction
with ECOMAX..C.
The eductors serve to extract the flue gas via the burner
ECOMAX and cannot be used for furnace pressure con-
trol. We recommend discharging 10 to 20% of the flue
gases via an additional flue gas opening on the furnace
fitted with a furnace pressure control system.
With 80 to 90% flue gas extraction at max. furnace
temperature, a positive furnace pressure can generally
be maintained even at low furnace temperatures. 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 furnace cham-
ber.
ECOMAX · Edition 10.17
p
FG
The motive air is set at the eductor by measuring the negative
flue gas pressure p between the burner and eductor.
FG
If the furnace temperature is too high, damage can oc-
cur to burners which are switched off due to the flow of
hot flue gases over them.
For direct heating, eductors EJEK..AGK with mechani-
cal flue gas valve (AGK) are recommended so as to
avoid gas creepage while the burner is switched off.
p p
atm FG
p
0
FG
33