delayed coker

delayed coker
A type of coker whose process consists of heating the residual oil feed to its thermal cracking temperature in a multi parallel pass furnace. This cracks the long chain heavy carbon and hydrogen molecules of the residual oil into coker gas oil and pet coke. Both are in a liquefied form in the mixture as it leaves the furnace and enters the coke drum. In the drum, the coker gas oil vaporizes and separates from the mixture. It is directed to a fractionation column where it is separated into the desirable boiling point fractions. The liquid coke solidifies in the drum as it cools and the velocity slows down. After the drum is full of the solidified coke, the hot mixture from the furnace is switched to a second drum. While the second drum is filling, the full drum is steamed to further reduce hydrocarbon content of the pet coke, and then water quenched to cool it. The top and bottom heads of the full coke drum are removed, and the solid pet coke is then cut from the coke drum with a high pressure water nozzle, where it falls into a pit for reclamation to storage. Larger cokers have several pairs of tandem drums.

Petroleum refining glossary. 2013.

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  • Delayed coker — A delayed coker is a type of coker whose process consists of heating a residual oil feed to its thermal cracking temperature in a furnace with multiple parallel passes. This cracks the heavy, long chain hydrocarbon molecules of the residual oil… …   Wikipedia

  • Coker unit — A coker or coker unit is an oil refinery processing unit that converts the residual oil from the vacuum distillation column or the atmospheric distillation column into low molecular weight hydrocarbon gases, naphtha, light and heavy gas oils, and …   Wikipedia

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