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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.
The residual oil or pitch is first heated to around 930Â° Fahrenheit (500Â° Celsius) and fed into the bottom of the coke drum where the cracking process begins. During cracking, gases and vaporized oils exit at the top of the coker unit for collection, while solid, porous coke builds up to form a mass inside the drum. Once a sufficient accumulation of coke is present in the drum, the feed is cut off and the process ceases.