I’m asking experts in MIP catalytic cracking: what type of fluidized bed does the riser belong to, and the same for the secondary riser?
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Our company uses MIP heavy oil catalytic cracking with a FDFCC modification. May I ask what type of fluidized bed each stage of the riser – the first stage and the second stage – belongs to? Transport bed, bubble bed, or rapid bed. In my opinion, the reaction type is a rapid transport bed, then again it is a bubbling bed, and yet again it is a rapid bed. I’m not sure if my understanding is correct
The riser belongs to the rapid transport bed, further belongs to the bubbling bed, and still further belongs to the rapid bed – your understanding is correct. .