Preparations
VITOBLOC 200
Operating instructions for the natural gas-fuelled CHP module
11
6130329
GB
Gas quality
WARNING
Natural gas and the combustion air
must not contain any phosphorus, ar-
senic, heavy metals or dust, and halo-
gens only in quantities up to the limits
stipulated.
The natural gas must be technically
free from mist, dust and liquids and
must not contain any substantial quan-
tities of corrosive components. The
methane number and the calorific val-
ue of the biogas must remain constant.
PLEASE NOTE
The methane number (not to be con-
fused with the methane content) is a
measurement for the knock susceptibil-
ity of the type of gas concerned. A too
low methane number will result in
knocking combustion and thus damage
the engine. We would like to point out
that the methane number will consider-
ably drop, especially if a liquid gas mix-
ture (propane/air and butane/air) is
added. We therefore recommend verifi-
cation with the local gas supplier that
this is not done so.
INSTRUCTION
As for the rest, please observe the
instructions in the cha
pter „Gas
connection“ of the assembly
instructions as well as the directives
contained in worksheet G 260 or G 261,
respectively, issued by the
Deutsche
Vereinigung des Gas- und
Wasserfaches e.V.
(DVGW).
Fuel values to be observed
parameter
value
calorific value H
i,N
> 5 kWh/Nm
3
methane number
1)
MZ
> 80
minimum flow pressure in the
controlled system for the gas
20 mbar
2)
maximum flow pressure in the
controlled system for the gas
50 mbar
maximum gas pressure varia-
tions (short variations due to
control activities)
± 3 mbar
maximum changing speed of
the gas pressure
3)
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 sulfide H
2
S
< 150 ppm
< 228 mg / Nm³
ammonia content NH
3
< 40 ppm
< 30 mg / Nm³
Table 3 Fuel values during the operation of a CHP module
1)
Operations with a lower methane number might be possible
after the CHP module manufacturer has examined the
circumstances.
2)
For the Vitobloc 200 EM-401/549 and EM-530/660
modules, the minimum flow pressure is 30 mbar.
3)
Flow pressure
in the module’s control system for the gas.
