Abstract: The hydrogenation reaction characteristics of different types of raw residue are different. Compared with the residue with high sulfur content and low nitrogen content, the residual carbon precursor hydrogenation reaction of residue with low sulfur content and high nitrogen content is relatively difficult. The content of iron and calcium in feedstock, process conditions, reaction material distribution and the proportion of vacuum residue in feedstock affect the operation time of fixed-bed residue hydrotreating unit. In order to achieve a long operation cycle, the technical measures can be adopted as follows: Developing catalyst and catalyst grading technology suitable for different feedstocks, adopting high-efficiency distributor, increasing the hydrogen partial pressure of the unit and adding a reactor to reduce the volume space velocity, developing technologies related to guard reactors, selecting the appropriate proportion of vacuum residue according to the specific conditions of each plant and unit.

Key words: residue hydrotreating, catalyst, reactor, long-term operation, technical measures