关键词: 全氢型炼油厂, 渣油加氢装置, 长周期, 催化剂床层, 平均温度, 反应器温升, 最大径向温差

Abstract: In order to solve the problem of large radial temperature difference at the bottom of the first reactor in the early stage of the third cycle of residue hydrotreating unit, the catalyst grading scheme and operation mode are adjusted accordingly in the fourth cycle. In the fourth cycle, while maintaining the demetallization activity of the catalyst in the first reactor, reduce its desulfurization and residual carbon conversion activity, and improve the desulfurization and residual carbon conversion activity of the catalyst in the rear reactor. When the overall activity of the catalyst is basically unchanged, the temperature rise distribution of each reactor is more reasonable. In the initial stage of the fourth cycle, the reaction temperature is rapidly increased to match the reaction temperature and slag mixing ratio, and improve the logistics distribution effect in the first reactor. Through the above adjustment, the problem of large radial temperature difference in the initial stage of the first reactor operation is effectively solved, which provides conditions for the long-term stable operation. The fourth cycle has been running for 666 days. The hydrotreated atmospheric residue produced from high sulfur, high carbon and high metal residue can meet the feedstock requirements of FCC unit.

Key words: full hydrogenation refinery, residue hydrotreating unit, long-term operation, catalyst bed, average temperature, reactor temperature rise, maximum radial temperature difference