Three Dimensional Simulation of Catalytic Cracking Reactions in an Industrial Scale Riser Using a 11-lump Kinetic

Most studies neglect the presence of thermal cracking reactions in industrial FCC process. Nevertheless, the present work proposes a new model which modified the 10-lumps kinetic model given by Jacob el al. (1976), through to inclusion a new lump named dry gas represent the results of the thermal reactions. Similarly as in the 10-lumps kinetic model, the proposed 11-lumps kinetic model considers that the feed is composed by four volatile groups of hydrocarbons: heavy paraffinic molecules, heavy naphthenic molecules, heavy aromatic substituent groups, carbon atoms among aromatic rings and light paraffinic molecules. Therefore can be used to represent different charge feedstocks. This is an important aspect because the feed composition can be quite different depending on the petroleum origin, gasoline quality and yield. It is known that the thermal cracking reactions are favored by high temperatures, occurring mainly in regions of inefficient mixture between the feed oil and the hot catalyst particles. In this work, a 3D CFD modeling of fluid catalytic cracking industrial riser with different geometric configurations were proposed to feed the catalyst particles. The main purpose is to study the effect of gas-particle turbulent mixture on thermal reaction and its effect on the gasoline quality and yield in a industrial riser.