Abstract: Based on the requirements of refining and chemical transformation development, a petrochemical company made significant adjustments to its production plan. After the implementation of the new plan, the crude distillation unit was changed from processing both high-sulfur and low-sulfur crude oils to processing only low-sulfur crude oil, resulting in a 10.65 percentage point decrease in the yield of residue (including vacuum gas oil from the sixth side-cut). A portion of the second side-cut oil from the atmospheric tower was used as feedstock for the high-pressure hydrocracking unit, increasing the jet fuel yield by 6.8 percentage points. The delayed coking unit processes low-sulfur residue to produce anode-grade coke, the quality of which meets the specifications for special carbon materials used in energy storage, with some performance indicators surpassing those of advanced enterprises. The wax oil hydrotreating unit was decommissioned, and coking gasoline was entirely routed to the diesel hydrotreating unit for processing, which improved the feedstock properties and product distribution of the fluid catalytic cracking (FCC) units. Consequently, the research octane number of stabilized gasoline produced from No. 2 and No. 3FCC units increased from 89.4 and 90.0 to 91.6 and 91.4, respectively. According to calculations, the implementation of the new plan results in annual operating cost savings of 98 million yuan and a reduction in gasoline blending cost of 128.76 million yuan per year.

Key words: low-sulfur crude oil, negative electrode coke, delayed coking unit, jet fuel, gasoline octane number