Abstract: Some problems occurred during the long-term running of a 1.39 Mt/a CCR unit in Yangzi Petrochemical Company were summarized. Countermeasures were applied and these problems were solved, such as using low coke rate catalyst to solve the bottleneck of catalyst regeneration; using desilication adsorbent to reduce the silicon content of feedstock; controlling the catalyst fines in reactor-regeneration system to avoid emergency shut down; recovering waste heat from stack gas, alkali-washing heat exchanger and online water-washing depentanizer to enhance equipment running efficiency; adopting technology innovation including putting elastic washer on the high-temperature flange of reactor and remodeling the scallop structure of the fourth reactor.

Key words: continuous regeneration, catalyst, efficiency, technical transform