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Severe foulin of turboexpander in FCC unit

Severe foulin of turboexpander in FCC unit

(OP)
In one of our FCC units (Kellog Orthoflow model), we are suffering severe problems of fouling (fines deposition) in the turboexpander. The scheme of the flue gas circuit is: two stage cyclones in the regenerator + Shell Third Stage Separator before turboexpander + 4th Stage Separator (cyclon) to recover flue gas from fines coming from TSS.
We have also observed high level of moisture in the fines from 4th Stage Separator (10-15%wt). So we suspect that the fouling of the expander is due a cold point in the flue gas circuit (where flue gas humidity is condensed) or an uncontrolled inlet of water / steam.

Has anyone experienced this kind of problems in an FCCU? What could be the potential causes of the severe fouling of the expander?
 

RE: Severe foulin of turboexpander in FCC unit

you should check your third stage separator ciclones.Have you the possibility to take samples on the bottom of the tss to analyse the catalyst fines?

LM

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