Refining Community Logo


Home Forums CatCracking FCC Process SLURRY STRAINER

This topic contains 2 replies, has 1 voice, and was last updated by  Anonymous 15 years, 8 months ago.

  • Author
  • #4145


    What are folks using in terms of slurry strainers?  Is there a particular manufacturer that have proven to be more successful in this application?

  • #7515


    If you refer to a strainer in order to protect the pumps of the slurry circuit, the best thing to do is install 2 big basket filters in parallel, one will be in operation and one out of service. When the pressure drop rises, take the second one in operation.
    Sizing the mesh is quite a trial and error procedure…

  • #7383


    So far there have been two different types of strainers discussed for two different reasons. First to protect your bottoms heavy oil pumps from plugging & impeller damage. This is best done with separate strainer/coke collection pots, switched after a D/P rise & then steamed & flushed clean to an appropriate recovery system. (Try to keep it removed from any sour H2O accumulation systems). The main goal here is in preventing the coke formation. This is accomplished by maintaining a high flow rate & watching your coking curve(Temp./API Gravity of oil). The other strainer concern is with the cat. fines contained in the hvy oil slurry. Some folks have had success with a “Gulftronic Filtering system” most use a settling tank or feed the slurry to a Coker & do not try to remove the cat. fines. If the fines in the slurry have caused any piping damage (holing thru on elbows or at high turbulance locations, such as downstream of regulators) then a sample should be ran & burned for ash residue & put under a microscope for micron size measurements of the cat. particles. This can help you understand the amount of cyclone damage in your Reactor & will allow you to track if the problem is getting worse. If the micron sizes are large, you have mechanical damage, if they are small, you have process problems (High velocity steam or feed nozzle issues pulverizing the cat. & breaking it up, causing the attrition of cat. to occur & go overhead from your Reactor.) Many people attempt to bleed this strained hvy oil stream back to the Reactor (recycle to extinction) but this plan reduces the amount of regenerated cat. to “see” fresh feed & your conversation suffers.
    The FCC Kid

You must be logged in to reply to this topic.

Refining Community