If you’re talking coke fractionator, the typical design is outlet of the bottom and side return to the agitator ring, here you have to keep in mind is to keep out any deposition of solids from this outlet nozzle; there are several way to keep this nozzle clean , some designs have some internally pipe over this nozzle and keep some flow on this outlet to avoid deposition of solids, either with a pipe coming out of some of the holes from the agitator ring (using the same bottom fluid or using an external current (using part of the stream that feeds the fractionator ( vacuum feed), these filters should be as large enough media (open area ratio 20:1) and that the valves as far as possible be installed in vertical pipe sections or use valves that do not allow the accumulation of solids in the gate
Im sorry for my english, best Regards
