4.2.1 Influences of operation conditions on product yields at
molecular level
The molecular composition matrix of product calculated by the SOL
molecular level model contained 9,505 structural vectors, each of which
represented one or several molecules. The structural vectors (molecules)
in products were divided into five categories: gas, gasoline, diesel,
gas oil, and coke based on the classification rules shown as follows:
Gas: Carbon Number≤4;
Gasoline: Carbon Number≥5 & Boiling Point≤200℃;
Diesel: Carbon Number≤23 & Boiling Point>200℃ & Boiling Point≤350℃;
Coke: Carbon Number≥24 & Boiling Point>450℃ or Content of Carbon≥90%;
Gas oil: the rest.
The division of products based on the SOL model was much more accurate
than the traditional multi-lumping model.
With the recycle ratio of 0.1-0.9 and the reaction temperature of 495℃,
the molecular composition matrix of the delayed coking feed oil
calculated in Section 2.3 was input into the delayed coking SOL model.
The product yields based on the calculated product molecular matrix are
shown in Figure 6.