what does the word “delayed” mean for the delayed coker unit?

[ruslannwax]

what does the word “delayed” mean for the delayed coker unit?
until to now, i was told of two different meaning:
1. it means the coking in the heater tube is very little and coking is delayed to the coke drum
2. it means the coke in the coke drum is not be decoked continuously, and decoking is intermittent, which means the decoking is delayed in the coke drum.
what is the right explanation, thanks.

[Anonymous]

the first one

best regards

[Anonymous]

I’ve heard:

1 – As above
2 – After heating, further processing/progress of the feed is delayed in a coke drum, until it cracks into lighter products that leave the drum, or forms coke that remains in the drum.

1 seems more commonly mentioned, however both are mentioned and the second seems more logical.

Since there seems little done to actually delay the coke formation (its more like: expedite it’s departure from the furnace), I think it refers to the extended time spent sitting “delayed” in the drum.

[Author]

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