Analysis of Coking Causes and Preventive Measures for FCC Settler
An analysis was conducted on the frequent coking problem in the settler of a 120 Mt/a heavy oil catalytic cracking unit.The composition analysis of coke blocks at different positions showed that the main components of coking were catalyst subdivision and non vaporized oil.From the coking mechanism analysis,the coke type of the unit belongs to soft coke.The insufficient amount of pre-lifting dry gas is the main cause of the coking of the settler.A series of preventive measures are put forward from the aspects of raw materials properties and operating conditions to reduce the coking of the settler and ensure the long-term operation of the catalytic cracking unit.
NETL
NSTL
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