Ultraformer Reactor

Evaluation of flow distribution inside an ultraformer reactor


THE PROBLEM

Ultraformer reactor

Ultraformer reactor

An Ultraformer at a refinery produces a high-octane blending component and mixed xylenes for chemical feedstock from hydrotreated heavy naphtha (sulfur and nitrogen removed to non-detectable limits) by converting paraffins and naphthenes to aromatics. It has been observed that hotspots develop in the tail reactor and large amounts of coke form in the catalyst bed, which must be burned off slowly during regeneration.


THE PROJECT

Velocity contours on vertical planes inside the reactor

Velocity contours on vertical planes inside the reactor

The objective of this project was to use computational fluid dynamics simulations and virtual reality simulations to investigate the flow patterns and optimize the operating conditions to prevent flow maldistribution problems. Several reaction layers exist within the utraformer. These layers, along with the geometry, and parameters of the fluid, all greatly effect the flow patterns.


THE RESULTS

flow pathlines

Flow Pathlines

Using fluid simultions and virtual reality, the problem was exemplified and thus validated the simulations. The specific flow pattern related to the build up of coke in the catalust bed was also illustrated and analyzed. Modifications to the original model where made to investigate changes to the scenario. Overall the project reached its objective by accurately displaying the flow patterns within the Ultraformer and provided a guide for potential solutions to the problem.

 

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Faculty Collaborator: Chenn Q. Zhou
Sponsor: BP Whiting

 Ultraformer Reactor
Download Ultraformer Project Flyer