Environmental Engineering Reference
In-Depth Information
16.3 Seasonal variation of the natural gas supply within the network of
E.on Avacon AG (source: Urban, 2010).
Table 16.5 Main advantages and disadvantages of separate local distribution
grids
Advantages
Disadvantages
Can be applied at little cost in suitable
partial network sections
Application in end distribution
networks only possible after case-to-
case examination
.
.
Comparatively low operating costs
.
Not practicable in transportation
networks; practicable with
restrictions in regional distribution
networks
.
16.4.4 Biomethane feed-in as additional gas
Additional gases are gas mixtures whose composition and combustion
characteristics are substantially different from those of the grid gas.
Additional gases can be added only to a limited extent. The rate at which
additional gas can be added is governed by the combustion characteristics of
the mixture downstream of the mixing point.
The definition of combustion behaviour occurs only after mixing of
biomethane with the natural gas flow. The higher the volume flow of the
base gas in comparison with the volume flow of the biomethane, the wider
the heating value of the biomethane can deviate from the heating value of
the base gas. The maximum permitted deviation from the heating value used
in the settlement in the respective network section is, again, 2%.
Feeding biomethane as additional gas in supra-regional transmission
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