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A coker unit is a thermal cracking process in the oil refinery industry used to recover valuable elements, the most important of which being petroleum coke from main refinery process residues.
Answer Wiki. The Delayed Coker unit is basically a tertiary unit for producing value added products such as petroleum coke(PetCoke). The heavy oil along with steam thermally cracked in the fuel fire furnace about 480C. Essentially the cracking begins at the onset of furnace and ends in the Coker.