texas commission on environmental quality (tceq) differential absorbtion lidar (dial) project summer...
TRANSCRIPT
Texas Commission on Environmental Quality(TCEQ)
Differential Absorbtion Lidar (DIAL) ProjectSummer 2007
Texas City, Texas
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
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
Project Funding
Total project cost $650,000 $200,000 funded by new
technology EPA grant $450,000 funded by TCEQ
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
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
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
Refinery July 25th to August 18th
Operated at less than 50% capacity – hurricane damage and turn around projects
Heavily industrialized area around the refinery
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
Refinery Sources cont. Coker unit
Total VOC Benzene- during decoking process
Aromatic Recovery Unit Sulfur recovery unit Temporary flare Large process flare
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
DIAL Technology Validation Techniques
UV-DOAS measurements closely agreed with DIAL measurements
Canister and tube samples agreed closely with DIAL measurements
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
Questions? Contact:
Russ Nettles, Team Leader Emissions Assessment Section, Air Quality Division of the TCEQ’s Chief Engineer’s Office
512 239-1493 [email protected]