28
Start-up
Exhaust gas test
Flue gas loss
Flue gas loss caused by free heat
arises as a consequence of the temper-
ature difference between the fuel-air
mixture entering the combustion cham-
ber and the gases that leave it. The
higher the air surplus and thus the
greater the flue gas volume, the higher
the loss.
It is calculated as follows:
q
A
= flue gas loss in %
t
A
= flue gas temperature in °C
t
L
= combustion
air temperature in °C
CO
2
= carbon dioxide
content in %
Examples:
Measured values in natural gas opera-
tion:
CO
2
content of the flue gases10.8 %
Flue gas temperature
195 °C
Air intake temperature
22 °C
Flue gas loss is calculated thus:
Measured values in fuel-oil operation:
CO
2
content of the flue gases12.8 %
Flue gas temperature
195 °C
Air intake temperature
22 °C
Flue gas loss is calculated thus:
q
A
t
A
t
L
–
A
1
CO
2
----------- B
+
=
Fuel oil
EL
Fuel oil
S
Natural
gas
City gas
Liquid
gas
A
1
=
0,50
0,490
0,370
0,350
0,420
B =
0,007
0,007
0,009
0,011
0,008
q
Af
195
22
–
0 37
10 8
------------
0 009
+
7 48pr
=
=
%
q
Af
195 22
–
0 49
12 8
------------
0 007
+
7 83pr
=
=
%
12/2011 14 072 205
Summary of Contents for Low-NOx N10.12000.30 G-EU2
Page 33: ...34 Manufacturer s declaration...
