Modification of Feeding System in Heavy Oil Catalytic Cracking Unit

The feeding System of the heavy oil catalytic cracking unit with a capacity of 600,000 t/a in Shengli Petrochemical Plant was modified in order to meet the requirements of atmospheric residuum processing. The utilization of a special UPC nozzle and a step wise feeding methods improved the atomization of raw materials, lowered the a-mounts of steam, and improved the distribution of products. The yield of gasoline increased by 3. 23%, that of light oil by 0. 63%, and the incremental economic benefits were 19. 292 million RMB/a.