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Accident # | 117083 |
State Police # | 09-04296 |
Accident Date | 2009-08-06 |
Report Date | 2009-08-16 |
Follow-up Date | 2009-10-26 |
Follow-up: | Yes |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
Sulfur Dioxide | 5 h 20m | SRU 1 and 2 | NO | YES | NO | 1,136.0 pounds |
Accident Classified As:
Sulfur Recovery Unit Train (SRU 2) shutdown due to a steam excursion in the refinery. The steam excursion had caused the SRU 2 to shutdown from low boiler water level. The acid gas loading from SRU 2 was added to SRU 1 which caused the emissions. A second incidence occurred when the refinery lost its hydrogen supply from Air Products. This caused the shutdown of the refinery hydrotreaters and a significant decrease in refinery acid gas production. SRU 1 shutdown due to the insufficient acid gas leading to a second emission.
Loss of refinery hydrogen from Air Products caused imbalance of the normal chemical ratios.
acid gas was routed from SRU 2 to SRU 1. Acid gas flaring was avoided and DGA strippers was contained until SRU 1 was restarted. SRU 1 was run at minimal air flow rates to avoid excess H2S consumption due from insufficient acid gas rates. Caustic addition was maximized in tail gas section to mitigate additional SO2 formation.
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