December 2018

Maintenance and Reliability

Determine root causes of undesirable petcoke properties from the DCU

The delayed coking unit (DCU) is the technology of choice for the upgrade of heavy hydrocarbon residues—i.e., bottom-of-the-barrel upgrading.

Gupta, A., Daggupati, S., Bisht, H., Mandal, S., Das, A. K., Reliance Industries Ltd.

The delayed coking unit (DCU) is the technology of choice for the upgrade of heavy hydrocarbon residues—i.e., bottom-of-the-barrel upgrading. Vacuum residue (VR) from the vacuum distillation unit is fed to the DCU, which is a semi-batch process typically having two coke drums in one block of the DCU. At any given time, VR is fed to one of the two coke drums (i.e., the online drum where thermal cracking takes place) and petroleum coke is gradually filled. Hydrocarbon vapors from the top of the online coke drum go to the fractionator for the separation of various liquid and gaseous products. After the online drum is filled 70%–80% with petroleum coke (petcoke), the VR is switched to the other

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