Report - DCE - Nationalt Center for Miljø og Energi

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The fugitive emissions from transmission, storage and distribution of natural
gas are based on data on gas losses from the companies and on the average
annual natural gas composition given by Energinet.dk.
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Emissions of NMVOC from flaring are given in the environmental reports
for the gas storage plants (DONG Energy, 2010; DONG Energy, 2011).
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The composition of fuel gas is given for 2008 by one of the two refineries. As
the composition for fuel gas is marked different than the composition of
natural gas, which has been used in earlier year’s calculations, the same fuel
gas composition is used in calculations for the other Danish refinery.
The emission factor for NMVOC have been included in the inventory for all
years (1990-2009) as the 2008 fuel gas composition is assumed to be more accurate
for the emission calculation than the annual composition for natural
gas being distributed in Denmark used in previous emission inventories. For
NOx and CO the emission factors from the EMEP/EEA guidebook 2009 are
used. For trace metals, dioxin and PAHs the emission factors given in the
guidebook (EMEP/EEA, 2009) for stationary combustion Tier 1 are adopted
for flaring in refineries. The refinery emission factors are listed in Table 3.47.