Area Source Emissions Inventory Improvement Update

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Area Source Emissions Inventory Improvement Update. Michael Ege, Emissions Inventory Specialist Air Quality Division Texas Commission on Environmental Quality (TCEQ) 2013 Environmental Trade Fair & Conference April 30 – May 1, 2013. Overview.
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Area SourceEmissions Inventory Improvement UpdateMichael Ege, Emissions Inventory SpecialistAir Quality DivisionTexas Commission on Environmental Quality (TCEQ) 2013 Environmental Trade Fair & ConferenceApril 30 – May 1, 2013Overview
  • Role and importance of the emissions inventory (EI)
  • Emissions inventory improvement
  • Updated condensate tank volatile organic compounds (VOC) emission factor project
  • Summary
  • Emissions Inventory Goals
  • Accurate determinations of mass emissions released to the atmosphere
  • Accurate identification of emission species released to the atmosphere
  • Ozone formation rates differ
  • Air toxics
  • Continuous improvement
  • Emissions Inventory – Use in PlanningEmissions Inventory Improvement Air quality research projects have improved the quantitative understanding of emissions sources that were previously unknown or underestimated.
  • Operation of assisted flares
  • Tank emissions from floating roof landings
  • Flash emissions from upstream oil and gas tanks
  • Heated storage tanks
  • Working and breathing losses from barges
  • Pneumatic devices
  • Previous Condensate TankVOC Emission Factor
  • Factor used for 2008 area source inventory
  • 33.3 pounds VOC/barrel condensate, from 2006 Houston Advanced Research Center H051C study
  • 25% control factor
  • Factor based on measured test data
  • 13 gas sites in Fort Worth basin
  • 9 gas sites in Western Gulf basin
  • Accounts for standing, breathing, and flashing loss emissions
  • Updated Condensate TankVOC Emission Factor Project
  • TCEQ contracted Eastern Research Group, Inc. (ERG) to develop new factors for eight geographic areas of Texas.
  • Data were obtained through:
  • a literature review;
  • “Upstream Oil and Gas Storage Tank Project Flash Emissions Models Evaluation” (TCEQ, 2009)
  • “Upstream Oil and Gas Tank Emission Measurements” (TCEQ, 2010)
  • an evaluation of data collected in the Barnett Shale Phase II Special Inventory; and
  • a phone survey of Texas condensate producers during the summer of 2012.
  • Updated Condensate TankVOC Emission Factor Project (Cont.)A significant number of data points contributed to the emissions factor development:Updated Condensate TankVOC Emission Factor Project (Cont.)
  • The study considered only data where flash emissions were estimated using a TCEQ-approved method.
  • Results were weighted by order of preference.
  • VOC factors were based on a production-weighted average.
  • Updated Condensate TankVOC Emission Factor Project (Cont.)Updated Condensate TankVOC Emission Factor Project (Cont.)Control factors were also developed.Updated Condensate TankVOC Emission Factor Project (Cont.) 2011 area source condensate tank VOC emissions:
  • 803,221 tons VOC using the previous statewide factor and 25% control factor
  • 202,281 tons VOC using the updated basin-specific factors and control factors
  • Resulted in a reduction of 600,940 tons VOC (75% reduction)
  • Updated Condensate TankVOC Emission Factor Project (Cont.) Reasons why the factor changed:
  • Previous factor developed in 2006 using a more limited data set
  • 2012 ERG report is based on more current data and a larger data set
  • Effects of new rules and permitting requirements
  • Industry outreach
  • Improved guidance for determining condensate storage tank emissions
  • Production weighting of data to develop emissions factors
  • Area Source EI Information
  • Condensate tank project report
  • www.tceq.texas.gov/assets/public/implementation/air/am/ contracts/reports/ei/5821199776FY1211-20121031-ergi-condensate_tank.pdf
  • Air quality research and contract reports Web page
  • www.tceq.texas.gov/airquality/airmod/project/pj_report_ei.html
  • Area source Web page
  • www.tceq.texas.gov/airquality/areasourceContact Information
  • Michael Ege
  • (512) 239-5706
  • Michael.Ege@tceq.texas.gov
  • Area source Web page
  • http://www.tceq.texas.gov/airquality/areasource
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