Numerical study on RFCC chemical stripping process

Numerical simulation was adopted to study the chemical stripping process in an annular resid fluid catalytic cracking (RFCC) stripper coupling Eulerian model as well as desorption, thermal cracking and catalytic cracking models. Solid volume fraction distributions and species contents in the gas oil along the stripper were investigated. Furtherly, the effect of adding high temperature activated catalysts in the catalyst inlet on stripping was analyzed. The results showed that the simulation results were in acceptable agreements with the experimental data. The simulated solid volume fraction at the bottom of the stripper was about 0.3—0.45, while in the upper section it showed a sharp decrease to 0.2. From bottom up, the contents of gas and gasoline components increased significantly to about 20% at the top, those of heavy components decreased to nearly 30% and of diesel components about 30% do not change much. With adding high temperature activated catalysts in the catalyst inlet, the contents of gas and gasoline components at the gas outlet increased, while those of diesel and heavy components decreased. When adding 60% of activated catalysts, the content of heavy components decreased to