Abstract: A new technology for FCC slurry processing with separate heating and post-furnace mixing steps was developed and applied in the 4.20 Mt/a delayed coking unit of CNOOC Huizhou Petrochemical Company. A separate heating furnace was set up to heat the slurry to effectively avoid the adverse effect of the slurry on the delayed coking unit. After adopting specific designs，the slurry processing system can steadily run for a long period. The yield of coker gas oil increased by 0.98 percentage points，the yield of coke increased by 2.10 percentage points，and the yield of gasoline and diesel decreased by 3.09 percentage points. The properties of dry gas, LPG，gasoline and diesel had little changed, while the properties of coker gas oil became heavier, and the ash content in coke increased, but it did not affect the operation of downstream units and the sale of products. Compared with selling slurry as fuel oil, the new processing method can increase profit by 101.2 million Yuan per year. This technology has high operation flexibility, which can mix other materials according to the demand, increase the outlet temperature of the heating furnace, and increase the reaction depth of residue in the coke tower, thus obtaining higher economic benefits.

Key words: delayed coking, FCC slurry, separate heating, long operation cycle, economic benefits