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Comparative assessment of Methane Emissions from Onshore LNG Facilities Using Differential Absorption Lidar (DIAL)

Innocenti, F; Robinson, R; Gardiner, T; Howes, N; Yarrow, N (2023) Comparative assessment of Methane Emissions from Onshore LNG Facilities Using Differential Absorption Lidar (DIAL). Environmental Science & Technology, 57 (8). pp. 3301-3310.

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This study provides results from measurements of methane emissions from three onshore LNG liquefaction facilities and two regasification facilities across different regions using the Differential Absorption Lidar (DIAL) technique. The measurement approach was to quantify at each facility emissions from the key functional elements (FEs), defined as spatially separable areas related to different identified processes. The DIAL technique enabled quantification of emissions at the FE level, allowing emission factors (EFs) to be determined for each FE using activity data. The comprehensive data presented in this paper show the potential of what could be achieved with a larger sample size both in terms of potential methane reduction and improving accuracy of emission inventories. Among the benefits in obtaining data with this level of granularity is the possibility to compare the emissions of similar FEs on different plants including FEs present in both liquefaction and regasification facilities. Emissions from non-continuous sources and super-emitters can also be identified and quantified enabling more accurate inventory reporting and targeted maintenance and repair. Site throughput during the measurement periods was used to characterise total site EF; on average the methane losses were 0.018% and 0.070% of throughput at the regasification and liquefaction facilities respectively.

Item Type: Article
Keywords: natural gas, liquefaction, regasification, fugitive emission, quantification, emission factor
Subjects: Environmental Measurement > Atmospheric Science, Emission and Security
Divisions: Atmospheric Environmental Sciences
Identification number/DOI: 10.1021/acs.est.2c05446
Last Modified: 02 May 2023 10:04
URI: http://eprintspublications.npl.co.uk/id/eprint/9692

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