Abstract: The internal structure of the disengager plays a decisive role in the flow status and residence time of the reaction oil vapor inside the disengager. The longer average residence time of the oil vapor, the easier it is to coke. SINOPEC Engineering Incorporation has conducted systematic research on the coking problem and anti coking technology of disengager in fluid catalyst cracking (FCC) unit using inferior raw materials, and developed a new generation anti coking disengager, including a fully enclosed cyclone fast separation system, cyclone riser blades, and anti coking steam rings, which has been successfully applied. This disengager can significantly reduce the residence time of oil vapor in the disengager with restricting oil vapor within the closed enclosure to prevent oil vapor from spreading to other spaces inside the disengager, effectively prevent oil vapor from coking in the disengager,and the oil separation efficiency is high, the solid content of the slurry is significantly reduced, which can extend the operating cycle of FCC unit.

Key words: disengager, cyclone, anti coking, residue fluidized catalytic cracking unit, vortex quick separator