83
Exhaust Gas Test
Exhaust gas test
To ensure an economically efficient and trouble-free
operation of the system it will be necessary to
adjust the burner specifically in accordance with the
furnace system. This is achieved by means of a
fuel-combustion air compound control unit which
adjusts the burner to ensure a proper combustion.
Exhaust gas tests are required for this purpose.
The percentage CO
2
and O
2
and the exhaust gas
temperature will have to be measured to determine
the efficiency and combustion quality.
Prior to any measurement make sure to check the
boiler and exhaust gas system for absence of
leaks.
Secondary air will falsify the measured results
Check that the exhaust gases have a residual oxy-
gen (O
2
) content as low as possible and a carbon
dioxide (CO
2
) content as high as possible.
The carbon monoxide content of the exhaust gases
must be below the currently applicable specificati-
ons in all load stages.
In the fuel oil combustion mode the permissible
soot number in the exhaust gas is not allowed to be
exceeded.
Determining the volumetric gas flow
rate
The thermal furnace output of a boiler
(Q
F
) is the amount of heat supplied with
the gas in a unit of time.
When taking the burner into operation
the volumetric fuel flow rate should be
selected according to the nominal ther-
mal capacity of the boiler.
Example:
Mean barometer readings
Nom. thermal output Q
N
1000 kW
Boiler efficiency
n
K
0,88
Calorific value of gas H
u
9,1 kWh/m³
Gas pressure
p
u
100 mbar
Barometer reading
p
amb
980 mbar
Gas temperature
t
gas
15 °C
Standard pressure
p
n
1013 mbar
Sea
level
[m]
Mean
barometer
readings
[mbar]
Aachen
205
991
Berlin
50
1009
Dresden
120
1000
Erfurt
315
978
Frankfurt/M.
104
1004
Hamburg
22
1011
Cologne
45
1009
Leipzig
130
998
Magdeburg
79
1005
Munich
526
955
Nuremberg
310
980
Rostock
4
1013
Stuttgart
297
984
Schwerin
59
1010
Ulm
479
960
Volumetric gas flow rate at STP:
Volumetric gas flow rate in
operating condition:
Ratio between O
2
- and CO
2
- for natu-
ral gas H (CO
2max
=11,86%)
%O
2
%CO
2
%O
2
%CO
2
0,00
11,86
3,00
10,16
0,10
11,80
3,10
10,10
0,20
11,75
3,20
10,04
0,30
11,69
3,30
9,99
0,40
11,63
3,40
9,93
0,50
11,58
3,50
9,87
0,60
11,52
3,60
9,82
0,70
11,46
3,70
9,76
0,80
11,41
3,80
9,70
0,90
11,35
3,90
9,65
1,00
11,29
4,00
9,59
1,10
11,24
4,10
9,53
1,20
11,18
4,20
9,48
1,30
11,12
4,30
9,42
1,40
11,07
4,40
9,36
1,50
11,01
4,50
9,31
1,60
10,95
4,60
9,25
1,70
10,90
4,70
9,19
1,80
10,84
4,80
9,14
1,90
10,78
4,90
9,08
2,00
10,73
5,00
9,02
2,10
10,67
5,10
8,97
2,20
10,61
5,20
8,91
2,30
10,55
5,30
8,85
2,40
10,50
5,40
8,80
2,50
10,44
5,50
8,74
2,60
10,38
5,60
8,68
2,70
10,33
5,70
8,63
2,80
10,27
5,80
8,57
2,90
10,21
5,90
8,51
O
2
21
CO
2max
CO
2gem
–
CO
2max
-----------------------------------------------
×
%
=
=
Ratio between O
2
- and CO
2
- for
light oil EL (CO
2
max =15,40%)
% O
2
% CO
2
% O
2
% CO
2
0,00
15,40
3,00
13,19
0,10
15,33
3,10
13,12
0,20
15,25
3,20
13,04
0,30
15,18
3,30
12,97
0,40
15,11
3,40
12,89
0,50
15,03
3,50
12,82
0,60
14,96
3,60
12,75
0,70
14,88
3,70
12,67
0,80
14,81
3,80
12,60
0,90
14,74
3,90
12,53
1,00
14,66
4,00
12,45
1,10
14,59
4,10
12,38
1,20
14,52
4,20
12,31
1,30
14,44
4,30
12,23
1,40
14,37
4,40
12,16
1,50
14,29
4,50
12,08
1,60
14,22
4,60
12,01
1,70
14,15
4,70
11,94
1,80
14,07
4,80
11,86
1,90
14,00
4,90
11,79
2,00
13,93
5,00
11,72
2,10
13,85
5,10
11,64
2,20
13,78
5,20
11,57
2,30
13,71
5,30
11,49
2,40
13,63
5,40
11,42
2,50
13,56
5,50
11,35
2,60
13,48
5,60
11,27
2,70
13,41
5,70
11,20
2,80
13,34
5,80
11,13
2,90
13,26
5,90
11,05
O
2
21
CO
2max
CO
2gem
–
CO
2max
-----------------------------------------------
×
%
=
=
600
700
800
900
1000
0
1000
2000
3000
4000
5000
Höhe in m.ü.M.
M
ittl
er
er
L
u
ftd
ru
ck i
n
m
b
ar
450
960
1013,25
Altitude in m above sea level
Me
an
at
m
o
s
p
he
ri
c
p
res
s
u
re
i
n
m
b
a
r
