Abstract: The reactor temperature and hydrogen production of continuous reforming unit in Hainan Refining Company began to drop from February 2014 followed by a significant reduction in March, the content of aromatics in reformate and aromatics yield were fallen dramatically. The analysis found that with increasing the proportion of Fotis crude oil with high nitrogen content, the nitrogen content of reforming feed increases; and that the dry efficiency decreases due to insufficient air drier capacity of air compression station and regeneration system, resulting in higher water content in regenerated air and H2O-nitrogen-chlorine coexistence environment which poisons the CCR catalyst. A series corresponding measures were adopted, including: adjusting feedstock composition, optimizing pre-hydrotreating operation, reducing the load and reaction severity of reforming unit appropriately, adding more spare air drier of air compression station, changing air desiccant of reforming regeneration system and increasing the amount of chlorine injection, to control the catalyst poisoning and recovery the activity. The plant operation is returned successfully to normal.

Key words: continuous reforming, catalyst, nitrogen poisoning, water, chlorine losing