A dispersion reactor model of both riser and downer reactors for
the fluid catalytic cracking is
proposed. The model combines the four-lump cracking kinetics, the
hydrodynamic model for
both the riser and downer, and the dispersion mixing model to predict
the fluid catalytic cracking
reaction performance. The results show that the axial gas
backmixing has a large influence on
the gasoline yields of the reactor. When the axial Peclet number
changes from 0.1 to 1000, the
yield of gasoline will increase approximately 11% under the same
conversion. Considering the
large reduction of axial gas backmixing in the downer compared with
that in the riser, the
gasoline yield can be increased 5.5% for the downer reactor, which is
consistent with the
experimental result. It is found that the overcracking rate will
greatly influence the reaction
performance in the riser. The plug-flow assumption for the riser
reactor is oversimplified in
the catalytic cracking process.
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