Analysis of Slurry Coking Problem Caused by FCC Reverse Reforming
800,000t/a heavy oil catalytic cracking unit(hereinafter referred to as dicat)was modified in 2017,the original pre-lift section of the reactor was dismantled,a new type of pre-lift was set up,the lifting pipe was modified,the feed oil nozzle was moved upward,and the reaction time was shortened from the original 4.3 s to about 3.1 s.The reaction section adopts the design idea of large agent-oil ratio and short residence time.After 10 months of operation,the slurry system started to coking,mainly due to insufficient reaction depth and insufficient slurry circulation,etc.The problem of slurry system coking was solved after changing the operating conditions and carrying out technical reform measures for the slurry system.
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