The slurry circulation has been interrupted – what should be done with the catalyst in the settler?
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In a catalytic cracking unit, if the slurry pumps fail (2 units), or if there is a leak in the heat exchangers, the slurry circulation is interrupted. (We will only discuss how to handle this interruption in slurry circulation.) What should be done with the catalyst in the settler? Transfer to regenerator single-unit fluidization? (Is the principle for handling accidents that the catalyst circulation slurry must not be interrupted?), or will it get stuck in the settler with all the steam shut off? I hope everyone can discuss it
It’s unlikely that both pumps will fail at the same time; if one fails, the backup pump is activated immediately, and it is then replaced with a repair pump. Of course, this means having one in use, one as backup, and one under repair – a total of three pumps
In the event of heat exchange leakage, activate the heat exchanger bypass first and shut down the system in accordance with the established procedure
Thank you for the reply. The slurry cannot circulate – what should be done with the catalyst in the settler?
Thank you for the reply. When there is a leak in the slurry heat exchanger, a fire usually breaks out, which necessitates shutting down the slurry pump; as a result, the slurry circulation is interrupted. Should the catalyst remain in the settler or be transferred to the regenerator for single-stream fluidization?
I’m not familiar with this; I handled it following the standard procedures
Cut the material, close the regeneration slide valve and plug valve, and carry out fluidized coking in a single unit.
Here, we simply operate the reprocessed oil tank to full capacity without changing any of the processes: lol. Although there is a connecting valve between the reprocessed oil and the circulating slurry, the liquid level in the reprocessed oil tank can be brought to full capacity within a few minutes through the feed line.
It depends, but a long-term failure would likely require shutdown; however, it could only be maintained for a short time. Safety is still important.
What if the liquid level at the bottom of the distillation tower rises, even when operating at full capacity?
Emergency measures for an accident situation generally wouldn’t cause the liquid level at the bottom of the tower to rise that much, right?