- Tier 3 Gasoline
Our team provided detailed engineering and procurement solutions to allow a refinery to meet Tier 3 requirements. Our solutions included modification to the existing gasoline desulfurization unit (GDU) to handle increased rates and a second feed blend while minimizing octane loss. This required installation of a new naphtha feed system, modifications to the HDS reactor, a new feed/effluent exchanger, modifications to the existing stabilizer, new splitter bottoms coolers, and modifications to existing pumps for new service conditions.
- Detailed design
The project objective was to make the changes necessary in preparation for Tier 3 regulations, which reduce sulfur in gasoline from current levels of 30 ppm down to 10 ppm. This project increased the GDU fluidized catalytic cracker (FCC) processing capabilities by adding a second feed blend of saturated gas naphtha and light straight run (LSR).
The increased charge rate required increased catalyst volume in the HDS reactor section to help reduce the sulfur content in the naphtha blended into the gasoline. It also required new equipment and modifications to the existing systems to handle the new processing rates.
The project required a detailed evaluation of the existing GDU, which utilizes Prime G+ process, which is licensed by Axens. This required critical collaboration between the engineering team, client and license provider.
The previous phase of the project was handled by another contractor, presenting a unique challenge to completely align with the process and project scope in order to execute a successful project with minimal design changes.
The project included the structural steel, foundations, piping, instrumentation and electrical components required to execute the project. Our team provided detailed engineering services and procurement.
- New splitter bottoms cooler
- New feed/effluent exchanger shell
- New naphtha feed filters
- New naphtha feed drum
- New naphtha feed pumps
- Stabilizer modifications
- HDS reactor modifications
- New stabilizer reflux pumps
- Existing pump modifications