How long can a 500,000 tons/year heavy catalyst bed remain in operation?
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There was no plan for winter shutdowns for maintenance, but maintenance is now required suddenly. The dense-phase diameter of the regenerator is 5.8 meters, and that of the dilute phase is 7.2 meters. I would like to ask those who have experience: for similar installations, what is the maximum duration of bed blockage that has been encountered in hours?
I stayed trapped for over a day; I haven’t tried any longer, as the risks are too great
It can generally stay sealed for a long time, maybe several days. But if the heat is removed from inside without removing the component itself, the sealing period will be much shorter. We have 600,000 tons
Reply to 3# wwwcode: The longest period of time we’ve experienced with the bed remaining inactive is 17 hours, and the temperature of the bed eventually drops to 460 degrees; winter makes things much more dangerous.
When the catalyst in the regenerator remains packed for a long time, to prevent bridging of the catalyst in the regenerative inclined tubes, the loosening points of those tubes should be closed.