Abstract: FCC slurry is blended in delayed coking unit. Compared with vacuum residuum，the FCC slurry has the characteristics of high density，low carbon residue，high aromatic content and high solid content. The experimental results of SINOPEC Jinling Company 1.6 Mt/a delayed coking unit showed that the yield of gasoline and diesel decreased，and the yield of gas oil and coke increased when the slurry blending ratio increased from 5.6% to 12.4%. The ash content of coke increased and the sulfur content of coke decreased simultaneously. Moreover，The increase of slurry blending ratio also led to the increase of fuel gas，steam and electricity consumption. The blending of slurry can cause coking in the furnace tube，blocking the filter at the bottom of fractionation tower and aggravating the wear of equipment. Controlling blending ratio，removing solid and adjusting the operation can be taken to ensure the stable operation of the delayed coking unit.

Key words: delayed coking, FCC slurry, fractionator, coke, energy consumption