Delayed
Coker
Dale:
My coker
fractionation tower top pressure surges higher by 5 psi for a few hours. Tower
top temperature jumps by 20°F - 40°F. The level in light gas oil pan drops.
This occurs every few days. What’s happening?
Norm:
You’re salting-up
the top few trays. The top reflux can’t cool off the upper trays. They get hot,
and sublime off the salts. A simple way to prevent the problem, is to
periodically heat up the top of the tower, maybe for 30 minutes by 30°F, every
few days. I’m not too sure about time and temperature factors. Periodic water
washing is also possible, but a lot more complicated.
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