Report - DCE - Nationalt Center for Miljø og Energi

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'MBSJOH PGGTIPSF
The emission factors for offshore flaring are shown in Table 3.48. The dioxin
emission factor originates from a Danish study by Henriksen et al. (2006)
and is, like emission factors for PM and SO2, the same as the emission factors
used for combustion of natural gas in Danish public power plants.
The NOx emission factor is based on the conclusion in a Danish study of
NOx emissions from offshore flaring carried out by the Danish Environmental
Protection Agency (2008). The recommended NOx emission factor (31
008 g pr GJ or 0.0015 tonnes NOx pr tonnes gas) corresponds well with the
emission factors used to estimate NOx emission in other countries with oil
production in the North Sea (Netherlands: approximately 0.0014 tonnes NOx
pr tonnes gas and United Kingdom: approximately 0.0013 tonnes NOx pr
tonnes gas). Emission factors for NMVOC and CO are based on the
EMEP/EEA Guidebook.
For trace metals, dioxin and PAH’s the emission factors given in the guidebook
(EMEP/EEA, 2009) for stationary combustion Tier 1 are adopted for
flaring in refineries. Emissions from flaring in gas treatment and storage
plants are calculated from the same emission factors, which are used for offshore
flaring.