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Area Source Emissions Inventory Improvement Update

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 Source Emissions Inventory Improvement Update

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  1. Area SourceEmissions 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

  2. Overview • Role and importance of the emissions inventory (EI) • Emissions inventory improvement • Updated condensate tank volatile organic compounds (VOC) emission factor project • Summary

  3. 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

  4. Emissions Inventory – Use in Planning

  5. Emissions 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

  6. 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

  7. 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.

  8. Updated Condensate TankVOC Emission Factor Project (Cont.) A significant number of data points contributed to the emissions factor development:

  9. 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.

  10. Updated Condensate TankVOC Emission Factor Project (Cont.)

  11. Updated Condensate TankVOC Emission Factor Project (Cont.) Control factors were also developed.

  12. 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)

  13. 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

  14. 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/areasource

  15. Contact 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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