A study was performed to verify the refinery vacuum tower feed inlet device modifications, comparing actual configuration to a future proposal.
The study was based in a comparison between the two configurations of tower internals and a verification of the best feed nozzle angle.
Two configurations was tested with a 42" nozzle diameter: one with a penetration angle of 135° and another one with a penetration angle of 235°.
The following condition have been used:
It must be noticed that the vapor maldistribution tends preferentially to take the streamlines to the north, northeast and the northwest region of the tower below the slop wax collector.
Despite the presence of the bed and wax collector the CFD study shows us that the vapor distribution was not uniform on the feed nozzle.
The preferential flow in the north region confirms a practical observation (present feed nozzle). This region is the hottest through the tower.
The future feed nozzel tend to avoid nonuniform vapor distribution and liquid entrainment.
Petrobras - Brazil
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