268698 Three Dimensional Simulation of Catalytic Cracking Reaction in an Industrial Scale Riser Using a 10-Lump Kinetic Model
Three Dimensional Simulation of Catalytic Cracking Reactions in an Industrial Scale Riser Using a 10-lump Kinetic Model
Fluid Catalytic Cracking (FCC) is one of the most important processes in the oil refinery. It converts heavy hydrocarbon petroleum fractions into more usable products such as gasoline, middle distillates, and light olefins. A FCC unit is composed basically by a riser reactor, strippers, cyclones and a regenerator. As it is one of the most profitable operations in a petroleum refining industry, several researchers have been focused their works on developing mathematical models that can predict the behavior of this process.
In this context, the application of the computational fluid dynamics (CFD) has assumed an important role in the study of the FCC process. Using appropriate mathematical models, the CFD tools allow the prediction of properties, such as velocity, temperature and concentration of the species. In addition it can also reduce enormously the time-consuming by computational resources and the cost spent for the improvement of the process and in the development of new projects.
Many kinetic models have been proposed for the
representation of the cracking reactions that occurs
in the riser reactor. Due to the complexity of the reaction mechanisms and the
large number of chemical species involved in the cracking process, these
species are often grouped into lump, according to their boiling point and/or
molecular characteristics (paraffins, olefins, naphthenic
and aromatics). One of the most widely used lumping models is the ten-lump
model proposed by JACOB et al., 1976 (BARAJAS et al., 2009). By dividing
The present study applies the ten-lump kinetic model proposed by JACOB et al. (1976) in the simulation of the catalytic cracking reactions in an industrial riser reactor. A three-dimensional model was used to predict the dynamic behavior inside the riser reactor.
The results were validated with a
set of plant data and compared with the results obtained by LOPES et al.
(2011), which applied a simplified four-lump kinetic model to simulate
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