Appendix
34
Installation instructions
VITOBLOC 200 EM-530/660
version
SCR
58
41436
GB
10.5 Gas quality
Natural gas and combustion air must not contain any
phosphorus, arsenic, heavy metals, dust or halogens
to an extent greater than the specified limits.
The natural gas must be free of mist, dust and liquids
and must not contain any significantly corrosive
constituents. The methane number and net calorific
value of the natural gas must be constant.
The methane number (not to be confused with the
methane content!) is an indicator for the knocking
propensity of the respective gas type.
Too low a methane number leads to knocking
combustion and hence to engine damage.
In the case of liquid gas admixing (propane/air and
butane/air), a significant drop in the methane number
occurs and it must be ensured that the gas supplier
refrains from such practices.
Required fuel values
Property
Value
Net calorific value H
i,N
> 5 kWh/Nm
3
Methane number
1)
MZ
> 80
Minimum flow pressure
(overpressure) available at gas
train
30 mbar
Maximum flow pressure
(overpressure) available at gas
train
50 mbar
Max. gas pressure fluctuations
(brief control fluctuations)
±3 mbar
Max. rate of change in gas
pressure
2)
3 mbar/min
Relative humidity
< 60 %
Temperature of gas mixture
downstream of gas/air mixer T
G
10 °C < T
G
< 30 °C
Chlorine content Cl
< 80 mg/Nm
3
CH4
Fluorine content F
< 40 mg/Nm
3
CH4
Total chlorine/fluorine
Σ(CI,F)
< 100 mg/Nm
3
CH4
Dust content < 5
m
< 10 mg/Nm
3
CH4
Oil vapour
< 400 mg/Nm
3
CH4
Silicon content Si
< 2 mg/Nm
3
CH4
Sulphur content S
< 200 mg/Nm
3
Hydrogen sulphide H
2
S
< 150 ppm
< 228 mg/Nm³
Ammonia content NH
3
< 40 ppm
< 30 mg/Nm³
Tab. 6
Fuel values
1)
Operation with a lower methane number may be possible
following a check by the manufacturer.
2)
Flow pressure available at the gas train at the unit.
10.6 AdBlue
TM
For operation of the SCR exhaust gas post-treatment
system, AdBlue
TM
operating fluid is required.
This precise composition of the 32.5 % urea water
solution is specified in ISO 22241-1.
AdBlue
TM
is classified as non-hazardous in
accordance with directives 67/548/EEC and
1999/45/EC, as well as Regulation (EC)
No 1272/2008.
10.7 Compressed air
The SCR system requires a permanent, external
supply of compressed air. The compressed air can be
provided either through an air compressor or from a
compressed air network (air quality at least as per
ISO 8573-1:2010 [4:-:4]).
The air is classified based on the definition of a
specific maximum percentage of contaminants that it
is allowed to contain. Particles, water and oil are
considered contaminants. Each class has a defined
maximum value for these three contaminants.
Purity of compressed air
– class [4:-:4]:
Solid particles 1-5 µm:
≤ 10,000
Water:
-
Oil (liquid, aerosol, vapour):
5 mg/m³
