IMR® 2800
42
IMR Environmental Equipment, Inc.
Siegert Calculation
The Siegert formula is used for all other fuels (see table below) and for the programmable
fuels.
-
Heat loss due to free heat (qAf)
-
Heat loss due to latent heat (qAg)
LOSS DUE TO FREE HEAT qAf
qAf
f
tA tL
CO
/
%
2
qAf:
Flue gas loss due to free heat
tA:
Flue gas temperature
tL:
Air temperature
CO2: Carbon dioxide content
f:
Fuel coefficient according to Siegert
The fuel coefficient factor depends on the fuel type (composition), the flue gas volume, and
the air number value.
LOSS DUE TO LATENT HEAT qAg
This is caused by incomplete combustion, when the flue gases contain CO portions. It is
calculated as follows:
qAg
a CO CO
CO
/
%
2
qAg: Flue gas loss due to latent heat
a:
Fuel factor
a =
32:
natural gas
48 :
fuel oil
The incomplete combustion of fuel oil results in further losses due to soot and oil coke
formation, the deposits of which cause insulation on the heating surface and an increase of
flue gas temperature.
COMBUSTION EFFICIENCY
Eta
qAf
qAg
100
%
Fuel
CO2max
K-factor (f)
alpha
O2-
reference
Vol.%
" -"
"Vol.%"
