27
Start-up
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 fur-
nace system. This is achieved by means
of a fuel-combustion air compound con-
trol 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 measu-
red results
Check that the exhaust gases have a
residual oxygen (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 cur-
rently applicable specifications in all load
stages.
In the fuel oil combustion mode the per-
missible 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
:
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
Q
F
Q
N
n
K
-------
1000
0 88
------------
1136kW
=
=
=
Ratio between O
2
- and CO
2
- for
natural gas H (CO
2max
=11,86%)
Ratio between O
2
- and CO
2
-
for light oil EL (CO
2
max=15,40%)
Mean barometer readings
%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
-----------------------------------------------
%
=
=
% 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
Sea
level
[m]
Mean
barometer
[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
600
700
800
900
1000
0
1000
2000
3000
4000
5000
Höhe in m.ü.M.
Mi
ttl
er
er
L
u
ftd
ru
ck i
n
mb
ar
450
960
1013,25
Me
an
at
mospheri
c
pre
ssur
e
in m
bar
Altitude in m above sea level
Volumetric gas flow rate at STP:
Volumetric gas flow rate in
operating condition:
V
Bn
Q
N
H
U
n
K
-------------------
1000
9 1
0 88
-----------------------
125m
3
h
=
=
=
V
BB
V
Bn
T
273
---------
p
n
p
amb
p
u
+
----------------------
m
3
h
=
=
125 273
15
+
273
---------------------
1013 25
980
100
+
------------------------ 123 9m
3
h
=
=
12/2011 14 072 205
Summary of Contents for Low-NOx N10.12000.30 G-EU2
Page 33: ...34 Manufacturer s declaration...
