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TCEQ's Differential Absorption Lidar (DIAL) Project: Emission Measurement and Assessment

The Texas Commission on Environmental Quality (TCEQ) initiated a DIAL project in Summer 2007 to evaluate emission sources at a bulk storage facility and a refinery in the Houston-Galveston-Brazoria area. The project aimed to compare DIAL measurements with traditional emission factors and techniques, measure emissions with advanced technology, and produce a comprehensive report. With a total cost of $650,000 funded by both EPA and TCEQ, this initiative validated DIAL technology against conventional methods, demonstrating its effectiveness in emission assessment.

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TCEQ's Differential Absorption Lidar (DIAL) Project: Emission Measurement and Assessment

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  1. Texas Commission on Environmental Quality(TCEQ)Differential Absorbtion Lidar (DIAL) ProjectSummer 2007Texas City, Texas

  2. Project Objective • Compare DIAL measurements with emissions calculated using traditional emission factors and calculation techniques • Measure emission sources located at a bulk storage facility and a refinery in the Houston, Galveston and Brazoria, Texas area

  3. Project Status • Draft DIAL report currently under review by TCEQ - Dec 2007 • After TCEQ review, the report will be sent to project participants for review and comment and then forwarded to EPA - January 2008 • TCEQ’s final report - June 2008

  4. Project Funding • Total project cost $650,000 • $200,000 funded by new technology EPA grant • $450,000 funded by TCEQ

  5. Project Technology • DIAL- Service provided by National Physical Laboratory (NPL) • Hawk Camera - Service provided by Leak Surveys Inc. • UV-DOAS (Ultraviolet-Differential Optical Absorption Spectroscopy) - Provided by EPA • Ambient Sampling- Performed by TCEQ staff and NPL

  6. Bulk Storage Facility Measurements • July 16th to July 20th • 3.5 days of DIAL measurements on naptha tanks with Hawk Camera footage • One night of DIAL measurements on large naptha tank

  7. Bulk Storage Facility Measurements cont. • One large external floater • Tank recently tested and well maintained • Additional wiper seal • Leg supports had fabric covers • Two internal floating roof tanks with hanging roofs

  8. Refinery • July 25th to August 18th • Operated at less than 50% capacity – hurricane damage and turn around projects • Heavily industrialized area around the refinery

  9. Refinery Sources • Fixed roof diesel tanks • External floating roof crude tanks • External floating roof gasoline tanks • Wastewater treatment area including a separator • Heated storage tanks • Three nights of storage tank measurements

  10. Refinery Sources cont. • Coker unit • Total VOC • Benzene- during decoking process • Aromatic Recovery Unit • Sulfur recovery unit • Temporary flare • Large process flare

  11. Coker Unit • Coker Design • 4 product cuts with overhead vapor sent to a vapor recovery unit or into the refinery fuel gas system • DIAL benzene measurements • Measured during decoking process

  12. DIAL Technology Validation Techniques • UV-DOAS measurements closely agreed with DIAL measurements • Canister and tube samples agreed closely with DIAL measurements

  13. DIAL Technology Validation Techniques cont. • Inline gas calibration cells provided by the refinery • Dial measurements very close to actual concentrations for propane, pentane and benzene • Benzene • Actual 1000 ppm • Predicted 900 ± 70 ppm

  14. Questions? • Contact: • Russ Nettles, Team Leader Emissions Assessment Section, Air Quality Division of the TCEQ’s Chief Engineer’s Office • 512 239-1493 • rnettles@tceq.state.tx.us

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