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RE: FCC Reactor cyclone inlet velocity

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I agree with all the other post but with out knowing the specifics can’t really give a proper recommendation.  You may want to run a higher Regenerator pressure if all other parameters may allow.  A slight pressure increase in the Regen on a UOP design does quite a bit.  Its all about the T/A interval here and whether the increased erosion/fines are okay.  Another thing to consider is if your TSS system is capable of handling the fines loading and if not, will it build up on your expander blades quicker?  That is if you have one.  Also you may want to weigh the price of Cyclone replacement versus the extra conversion your getting from running so much more cat circulation.  A small increase in feed temperature to decrease cat circ may be more profitable than gutting your entire regen on next T/A. 

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