8/9/2019 Future Natural Gas Qualities - Fact Sheet
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Dokument: 13/95095-2 1 /2
27 September 2013JBR
Future Natural Gas Qualities - Fact sheet
With the expansion of the Danish gas transmission system larger
variations innatural gas qualities are expected. The natural gas
will be of second Gas familytype H. The gas can be imported either
from the Danish Nord Sea or from Ger-many. The gas from the Danish
North Sea sector has a high content of ethane,propane, and butanes
and therefore has a high calorific value and high density.
The gas from Germany is a mix of domestic gas, Norwegian, Dutch
H-gas, andin the future Russian gas. The gas has typical a lower
calorific value and lowerdensity than the Danish North Sea gas.
Greater variation will occur because ofmore different sources.
The gas in Energinet.dk’s grid shall always be within the Danish
Gas Specifica-tions and the limits listed in Rules for Gas
Transport appendix 1.
Max Value Min ValueWobbe index (kWh/Nm3) 15.5 13.9Relative
density (-) 0.700 0.555
Table 1 The table shows current limits for wobbe index and
relative density.
I the table below 4 different expected gas compositions are
shown. The except-ed gas qualities in the Danish transmission grid
are a span the 4 variations andmixtures of those though
additionally gas compositions within the specificationis
possible.
Example ofexpectedgas quality
Example ofexpectedgas quality
Future possible gasquality with lowcalorific value andwobbe
Danish gasquality 2005-2009
Methane mol - % 89.85 90.08 98.19 89.64Ethane mol - % 5.01 3.43
0.68 5.87Propane mol - % 1.01 0.71 0.21 2.32I-butane mol - % 0.10
0.074 0.035 0.38N-butane mol - % 0.12 0.091 0.033 0.53I-pentane mol
- % 0.021 0.015 0.0046 0.12N-pentane mol - % 0.017 0.011 0
0.078
Hexane+ mol - % 0.016 0.012 0 0.056Nitrogen mol - % 2.53 4.76
0.82 0.29Carbon dioxide mol - % 1.33 0.81 0.034 0.72Gross calorific
value kWh/Nm³ 11.30 10.91 11.08 12,15Gross calorific value MJ/Nm³
40.68 39.26 39.89 43.73Wobbe index kWh/Nm³ 14.39 13.97 14.74
15.27Wobbe index MJ/Nm³ 51.79 50.30 53.06 54.96Relative density -
0.617 0.609 0.565 0.633Normal density kg/Nm³ 0.798 0.788 0.731
0.818
Table 2 The table shows possible gas qualities in the
transmission grid.
