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Minimum feedrate in Fluid Catalytic Cracker

Minimum feedrate in Fluid Catalytic Cracker

(OP)
Dear all,

My question is related with the potential problems that could appear when the feedrate in a FCCU is reduced to the technical minimum (turn-down) or below.

- According to your experience, what is the minimum feedrate that can be processed in a FCCU? 60% of nominal feedrate or does anyone operated below this point?
- Which are the most likely limitations that could appear in this point?
1. Insufficient gas flow rate to the wet gas comppresor?
2. Insufficient pressure or delta P in feed nozzles? Problems to obtain a suitable vaporization?
3. Insufficient coke production to close heat balance?
4. Insufficient liquid-vapour traffic in the main fractionation?
5. Any other limitation?

Thank you very much for your collaboration

Best regards
 

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