Abstract: The effect of three additives including metal compounds、aromatic components and radical generating agents on the distribution of delayed coking liquid products was investigated by the laboratory small coking evaluation device. It was found that the effect and mechanism of different additives on the yield of liquid products were different. Blending FCC slurry less than 10% has little effect on the product distribution of coking, and the liquid yield is increased slightly when blending 10% of the slurry. The coke yield decreases by 1.32 percentage points after adding tetralin, while the yield of liquid product increase 5.21 percentage points. However, due to its high cost, it is not suitable for popularization and application. Considering comprehensively, the metal compound additive has application prospect. The metal compound additive can increase the yield of liquid products by 1.2 percentage points.

Key words: additive, delayed coking, tetralin, metal compound