Hello Mr. Squirrel – can I offer you a nut?
By slurry, I assume you mean FCC main column bottoms or CSO or clarified slurry oil or Cat bottoms or decant oil or……. any other ideas out there? The funny part about this stuff is that most FCC people have stopped using their decanter or clarifier to get the FCC fines out of this stuff, causing the coke or other processing unit’s headaches. But I digress.
CSO, as I prefer to call it, is like molecular glue. It cross-links coke structures for a variety of reasons. It also requires a lot more energy to crack. So if you are batching it into the bottom of the drum, you could have a new coke morphology being created which is causing draining issues.
What percentage on feed are you putting it into the drum
For how long?
How long is the cycle time?