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Delayed Coking Unit

The Delayed Coking Unit receives heavy crude oil as well as the heaviest hydrocarbon streams from the Crude Distillation Tower. This process thermally cracks heavy hydrocarbon streams to produce lighter components and solid petroleum coke.
The feed is run through a heater and sent to a distillation tower. The light hydrocarbons (naphtha, gas oils) are sent to a combination tower where they are further separated into various streams. The remaining (bottom) reduced crude is then heated and sent to coking drums.
The drums are kept at extremely high temperatures in order to thermally crack the reduced crude. This removes any remaining light hydrocarbons and leaves nearly pure carbon behind. This carbon product is called petroleum coke. When full, the coke drum is scraped clean of all coke, and the coke is sent to a containment area to be sold.