Actions for Comparing facility-level methane emission rate estimates at natural gas gathering and boosting stations [electronic resource].

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Comparing facility-level methane emission rate estimates at natural gas gathering and boosting stations [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 71 : digital, PDF file
Additional Creators
National Renewable Energy Laboratory (U.S.), United States. Department of Energy. Office of Energy Efficiency and Renewable Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Coordinated dual-tracer, aircraft-based, and direct component-level measurements were made at midstream natural gas gathering and boosting stations in the Fayetteville shale (Arkansas, USA). On-site component-level measurements were combined with engineering estimates to generate comprehensive facility-level methane emission rate estimates ('study on-site estimates (SOE)') comparable to tracer and aircraft measurements. Combustion slip (unburned fuel entrained in compressor engine exhaust), which was calculated based on 111 recent measurements of representative compressor engines, accounts for an estimated 75% of cumulative SOEs at gathering stations included in comparisons. Measured methane emissions from regenerator vents on glycol dehydrator units were substantially larger than predicted by modelling software; the contribution of dehydrator regenerator vents to the cumulative SOE would increase from 1% to 10% if based on direct measurements. Concurrent measurements at 14 normally-operating facilities show relative agreement between tracer and SOE, but indicate that tracer measurements estimate lower emissions (regression of tracer to SOE = 0.91 (95% CI = 0.83-0.99), R2 = 0.89). Tracer and SOE 95% confidence intervals overlap at 11/14 facilities. Contemporaneous measurements at six facilities suggest that aircraft measurements estimate higher emissions than SOE. Aircraft and study on-site estimate 95% confidence intervals overlap at 3/6 facilities. The average facility level emission rate (FLER) estimated by tracer measurements in this study is 17-73% higher than a prior national study by Marchese et al.
Report Numbers
E 1.99:nrel/ja--6a20-70688
nrel/ja--6a20-70688
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Note
Published through SciTech Connect.
02/09/2017.
"nrel/ja--6a20-70688"
Elementa Science of the Anthropocene 5 0 ISSN 2325-1026 AM
Timothy L. Vaughn; Clay S. Bell; Tara I. Yacovitch; Joseph R. Roscioli; Scott C. Herndon; Stephen Conley; Stefan Schwietzke; Garvin A. Heath; Gabrielle Pétron; Daniel Zimmerle.
Funding Information
AC36-08GO28308
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