Abstract: Based on production data from delayed coking units incorporating catalytic cracking slurry, the effects of feedstock properties and operating conditions on petroleum coke quality indices were briefly analyzed. The results indicate that aromatic hydrocarbons in slurry serve as the key component enhancing the specific capacity of coke, whose effect is restricted by the content of resins and asphaltenes. A sulfur mass fraction below 2% and a metal mass fraction within 400—600 μg/g exert minor influence on specific capacity, whereas excessive contents lead to significant performance degradation. Properly increasing the recycle ratio in accordance with feedstock characteristics and moderately elevating the coke drum top pressure are conducive to improving coke quality. Synergistic optimization of feedstock and process enables the production of high-grade negative electrode coke with a specific capacity exceeding 350 mA.h/g, providing theoretical support and technical references for the optimization of industrial operations.

Key words: negative electrode coke, delayed coking, catalytic cracking slurry, process conditions