A major Gulf Coast refinery employs a vapor collection system to reduce hydrocarbon and hydrogen sulfide (H2S) emissions from several sources associated with the primary wastewater treatment system. This system experienced problems that were impairing its performance. The refinery engaged GUERNSEY to evaluate the existing system and provide the following as a means of improving the performance of the system:
- Develop a list of short-term recommendations for improving the performance of the wastewater vapor recovery system.
- Evaluate / recommend any required upgrades to ensure the safety of the system.
- As necessary, develop a longer-term solution to address the operational issues associated with the wastewater vapor collection system.
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GUERNSEY visited the refinery to inspect the vapor collection system and collect data related to its operation. Interviews were conducted with Refinery Engineering and Operations personnel.
In completing the system evaluation, GUERNSEY utilized the following approach:
- A design basis was developed to establish the flow rates and compositions of the vapor streams collected by the system. Both normal operations and emergency operations were considered.
- Current operational issues were evaluated. Based on this evaluation; options for improving system performance were identified.
- The system was evaluated to determine options for minimizing vapor rates associated with the release of light straight run gasoline to the warm process sewer system.
- Recommendations were developed for system modifications to ensure that the system performs well in both normal and emergency conditions.
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GUERNSEY engineers reviewed and evaluated the design work developed to implement the recommendations of the study.
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