Reasons for fluctuations in catalyst reserves
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Since September 16, when fluctuations occurred in the inventory in the stripping section, measures such as adjusting the inventory in that section, the amount of stripping steam, and loosening the raw oil riser were taken, the system has operated stably for over 20 days. Large fluctuations occurred again in the past two days, especially around 22:20 on October 1st during the middle shift; there was a significant increase in the inventory in the stripping section, while the total inventory in the regenerator decreased significantly. This situation lasted for about 20 minutes.
Instrument issue. Poor fluidization; there are coke deposits in the feed pipe
Based on what the poster said, it’s less likely to be the gauge, but it’s more likely that there’s a blockage caused by carbon deposits! If that’s indeed the case, it is indeed difficult to handle; generally, emergency shutdowns are required to remove the coke!
Check the fluctuations in the raw material riser; determine whether the riser density increases or decreases when the inventory in the stripping section rises, and decide whether the issue lies with the stripping section or with the cone or the riser and sleeve. Also, by how much has the reserve in the regenerator decreased, and by how much has it increased in the stripping section? Is there catalyst accumulation at the anti-coking screen above the stripping section?
Check the bulk density of the vertical pipes; if there are fluctuations in the bed temperature after the catalyst is discharged, it indicates that bridging has occurred inside. Verify whether the pressures at various loose points are normal – if not, something is blocking the flow. If operations are running normally, the likelihood of clogging due to falling coke particles is low, but if there are significant fluctuations in the reaction temperature and the pressure in the settler, it’s possible that lining pieces from the gas section have fallen onto the grid. In any case, the catalyst circulation needs to be checked and repaired. As the weather gets colder, repairs should be carried out as soon as possible