FCC two-reactor fluidized coking problem
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After the FCC shuts off the feed, why is fluidized coking carried out in two reactors instead of directly through fluidized coking in a single reactor to remove the catalyst (and what is the control level for the Cat circulation rate during fluidized coking in two reactors? Why is it still necessary to visually check the color of the Cat before switching to single-container fluidized burning? I hope the experts can provide some guidance; thank you!
When fluidized coking takes place, it is necessary to inject combustion oil; in this case, the effect of coking needs to be considered
The purpose of fluidized coking in these two units is to burn off the coke on the catalyst in the lift pipe, settler, and stripping section； If it is only single-reactor fluidized coking, then a large amount of coke will be carried on the catalyst in the settler and stripping section, and it will be directly discharged into the catalyst storage tank during catalyst removal.
The control value for the Cat circulation rate is primarily determined by the temperature at the outlet of the riser; the normal value is sufficient