柴油加氢改质装置降低柴汽比运行分析

根据国Ⅵ油品质量升级及降低企业原油炼制产品中柴汽比要求，中石油克拉玛依石化有限责任公司于2018年5月对现有1.2 Mt/a柴油加氢改质装置进行了工艺扩量升级改造。通过新增一台反应器、分馏系统改造、增加吸收稳定系统及调整催化剂级配方案等一系列措施，装置加工规模由1.2 Mt/a扩大至1.5 Mt/a。标定结果表明，改造后，装置的石脑油收率由14.53%提高至32.90%，产品柴油收率由46.80%降至39.43%，装置柴汽比由3.22降至1.20。新的催化剂级配体系具有优异的加氢脱硫、脱氮活性及生产灵活性，可以满足炼油企业油品质量升级及降低产品柴汽比的需要。

OPERATION ANALYSIS OF REDUCING DIESEL/GASOLINE RATIO OF DIESEL HYDRO-UPGRADING UNIT

According to the requirements of the China VI oil product standard and reducing the diesel/gasoline ratio, PetroChina Karamay Petrochemical Company expanded and upgraded the existing 1.2 Mt/a diesel hydrogenation upgrading unit in May 2018. By a series of means such as adding a new reactor, revamping the fractionation system, adding an absorption stabilization system, and adjusting the catalyst gradation scheme, the processing scale of the unit was expanded from 1.2 Mt/a to 1.5 Mt/a. The full load calibration results showed that the naphtha yield was increased from 14.53% to 32.90%, the diesel yield was reduced from 46.80% to 39.43%, and the diesel/gasoline ratio of the unit was reduced from 3.22 before the modification to 1.20. It is proved that the new catalyst grading system exhibited excellent performance in hydrodesulfurization, denitrogenation, and flexible selectivity, which could meet the needs of oil quality upgrading and lower diesel/gasoline ratio in refineries.