Abstract: The newly built third 3.0 Mt/a slurry residue hydrogenation unit in a refining -chemical integration project has achieved full-capacity long-term operation since commissioning. The total conversion rate of the unit generally aligns with the design specifications, while the single-pass conversion rate is slightly exceeds design value. All operational indicators meet expectations. The high single-pass conversion rate coupled with lower total conversion rate indicates that the light components generated during the reaction have not been completely separated from the system, which corresponds to the actual production observation where light components in residual oil exceed design values. Based on the operation experience from the first and second slurry residue hydrogenationunits, the third unit incorporated targeted modifications during initial design to address bottleneck issues. These improvements effectively mitigated coking and blockage problemsunder high-load extended operation conditions, providing valuableoptimization insights and directions for both unit revamping and future new facility construction.

Key words: slurry residue hydrogenation, full-capacity, single-pass conversion rate, slurry fractionation unit