Coker design achieves cycle times, throughput needs at Kansas refinery

Over the last few years, Frontier Refining’s plant in El Dorado, Kan., has undergone a major refinery reconfiguration to facilitate processing a greater proportion of very heavy crudes. The project added a new vacuum unit and revamped several existing units for processing the heavier crude oil feed.These modifications produced significant constraints on the coker unit, due to the lack of sufficient coke-drum volume. Frontier evaluated running shorter drum cycles, but review of the drum’s vapor velocity indicated severe foaming and carryover would likely result.In addition, coke-drum reliability was decreasing because of frequent drum cracks. Frontier evaluated several options ...

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