Abstract: The adjustment of refinery configuration and upgrade of oil quality requires the refinery to adjust the processing strategy of FCC process to increase clean gasoline and reduce inferior FCC LCO. Aiming at the problems of different cracking selectivity of heavy oil and hydrogenated LCO, a dual independent reactors system, which combines MIP and LTAG technologies, was designed for revamping FCC unit. More gasoline with high octane number and aromatics were produced by precisely controlling the hydrogenation depth of LTAG process. After revamping, the RON and yield of gasoline increased significantly, while lowering the olefin content and increasing aromatic content. Meanwhile, the cetane number of LCO declined and the density of slurry increased slightly. In addition, due to the reduction of LTAG auxiliary tower slurry, the supplement of oil slurry for auxiliary fractionation tower to ensure the operation of the oil slurry system was needed.

Key words: catalytic cracking, heavy oil, MIP, inferior LCO, LTAG, high octane number gasoline, slurry