IMR® 2800
41
IMR Environmental Equipment, Inc.
4.3 HEAT LOSSES
Complete utilization of heat emitted during the combustion process is desirable, as is a very
small heat loss of flue gases. The loss of free heat is caused by the temperature difference
between the fuel air mixture entering the furnace and gases evolved. The larger the amount of
excess air and thereby the volume of flue gas and the higher the flue gas temperature the
higher the losses and smaller the combustion efficiency.
BImSchV - calculation
The BImSchV-calculation is used for the fuels below.
qA
tA
tL x
A
O
B
2
20 9
2
.
%
qA = Losses in %
tA = Flue gas temperature in oC
tL = Air temperature in oC
O2 = Oxygen in %
Oil
light
Natural
gas
Town
gas
Coal gas
Liquid gas
Coke Wood
(air-dry)
CO2max
A2
B
O2B
15.5
0.68
0.007
3%
11.8
0.66
0.009
3%
13.7
0.63
0.011
3%
12.5
0.60
0.011
3%
13.5
0.63
0.008
3%
20.5
0.65
0.008
7%
20.3
0.65
0.008
11%
Combustion Efficiency:
Eta
q
A
100
(%)
