Coker unit

A coker or coker unit is an oil refinery processing unit that converts the residual oil from the vacuum distillation column into low molecular weight hydrocarbon gases, naphtha, light and heavy gas oils, and petroleum coke.

The process thermally cracks the long chain hydrocarbon molecules in the residual oil feed into shorter chain molecules leaving behind the excess carbon in the form of petroleum coke.

This petroleum coke can either be fuel grade (high in sulphur and metals) or anode grade (low in sulphur and metals).

The calcined petroleum coke can be further processed in an anode baking oven in order to produce anode coke of the desired shape and physical properties.

The schematic flow diagram below depicts a typical delayed coker: