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Accident # | 94654 |
State Police # | 07-01271 |
Accident Date | 2007-03-16 |
Report Date | 2007-03-23 |
Follow-up Date | 0000-00-00 |
Follow-up: | Yes |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
Sulfur Dioxide | No information given. | Thermal Oxidizer #1 (TOX) | NO | YES | NO | BRQ |
Accident Classified As:
On March 16, 2007, Valero shut down its DHT due to a process heat exchanger leak, and thus had to shut down its SRU, 3700, due to insufficient sulfur feed from the DHT. When SRU was down, they kept the reactor warm using hot air sweep, which release sulfure dioxide from the sulfure deposited on the reactor bed, through the Thermal Oxidizer. On March 19, they brought the DHT and SRU back into service. During the start-up of the DHT, the TGTU (tail gas treatment unit) inline mixer at SRU 1600 tripped, which caused excess SO2 emissions as well.
The incident consisted of DHT and SRU shutdown and TGTU trip events. In the TGTU event, they restarted the TGTU as soon as possible to minimize emissions.
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