5 CONCLUSIONS
The delayed coking reaction kinetic model established based on the free radical chain reaction mechanism and SOL method showed good reliability on molecular distribution of coking product. The model could track the reaction path of any specific molecule in the complex thermal cracking reaction network. 173 structure vectors in gasoline and 1,132 structure vectors in diesel were obtained by the calculation of the SOL molecular-level model. And these gasoline and diesel structural vectors were classified into isoparaffins, normal paraffins, olefins, naphthenes and aromatics according to the discriminant rules. The influences of operation conditions such as recycle ratio on the product distribution could be discovered through the calculation of the molecular-level model, which is helpful for the process optimization and precise regulation of product composition for the delayed coking plants.