Abstract: Based on analysis of refinery total process, the whole strategy of FCCU efficient operation was discussed. By the separated storage and separated process of crude oil and the coordinated operation of CDU-delayed coking-hydrotreating of VGO, the < 350℃ diesel fraction in FCC feed can be reduced. The FCCU operation with high efficient was realized by increasing operation load of solvent deasphaltene and VGO hydrotreating–distillation process, as well as residue blending in FCC feed. Besides, HCO and LCO after hydrotreating can be converted to gasoline, thus the diesel/gasoline ratio is reduced based on the load of reforming and H2 PSA operation. At the same time, the coking unit operates under low load and obtains new function through the recycling of light hydrocarbon and heavy oil.

Key words: plant process, synergistic operation, feedstock of FCCU, high efficient conversion, ratio of D/G