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2 Description UTSK
2.4.4
Flue gas recovery (option)
The flue gas recovery unit is a system which recirculates part of the flue gas to the
secondary air zone. This reduces the combustion chamber temperature. The amount of
flow is regulated as a function of combustion temperature and boiler capacity. The
complete procedure is set during assembly and runs automatically.
•
Flue gas recovery fan with frequency converter
•
Flue gas pipe with non-return flap, compactly mounted on the underfeed combus-
tion system (insulated by customer)
•
Control unit and regulation in the control cabinet
Fig. 9
Item Designation
1
2
3
4
5
Boiler size
UTSK-180-240
UTSK-300-360
UTSK-450-550
UTSK-700-900
Underfeed grate UTSK
1.10 en
5
1
Flue gas recovery
Recirculation fan
Check flap valve
Swing-type check valve
Temperature monitoring
Cleaning openings
Flue gas recovery (mm)
5
120 / 100
120 / 100
150 / 150
150 / 150
2
1
4
5
3
D-27
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