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FCC – leading-edge technology for enhanced reliability and environmental performance

Refiners are under immense pressure to improve the performance of their fluidised catalytic cracking (FCC) units. At the same time, there are changing market demands and environmental issues to consider. Shell Global Solutions helps by selecting technology from an extensive line-up to devise process solutions that meet individual customer’s objectives.
 
FCC technology from Shell Global Solutions includes a range of features, some of which are not available elsewhere.

Feed injection system: Proprietary side- and bottom-entry feed nozzles offer good riser coverage and mixing with the catalyst. This can result in higher gasoline yields, less dry gas, lower steam consumption and reduced pressure requirements.

Riser internals: Riser internals improve catalyst distribution and reduce spent catalyst reflux, which minimises nonselective thermal cracking.
Close-coupled reactor cyclones with coke catcher:
In addition to providing high separation efficiency, close-coupled cyclones minimise post-riser cracking and reactor vessel coking.

High-efficiency stripper: Proprietary PentaFlow stripper packing removes up to 95% of hydrocarbons. The relatively open design prevents plugging, enhances catalyst flux and facilitates access for maintenance.
Catalyst circulation enhancement technology:
This improves circulation rates by up to 50% and is applicable to both the stripper and the regenerator standpipes; it improves stability and pressure build-up by optimising the catalyst condition near the inlets.

Flue-gas technology: Shell pioneered third-stage separator (TSS) technology and has installed more than 60 units over the past 50 years. A TSS typically reduces flue gas particulate emissions to less than 50 mg/Nm3. It also protects the flue gas system from erosion.

Product separation: Excellent separation can be achieved through the use of high-capacity mass transfer internals, including the Shell Calming Section and the Shell HiFi* and Shell Grid trays.
 
Have you considered how you can
· maximise riser coverage and catalyst mixing?
· minimise non-selective thermal cracking?
· limit flue gas particulate emissions?

*Shell HiFi is a Shell trademark.

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