Study On The 12-lump Kinetic Model For RFCC Process In A DCR Unit

Based on Routine analysis data of feedstock oil composition,reaction mechanism and product distribution characteristics,the entire residue fluid catalytic cracking(RFCC)reaction system was divided into 12 lumps and a 12-lump reaction network containing 54 virtual reaction pathways was constructed.According to the appropriate simplification and assumption,the lumped model kinetic equation was established.Using the experimental data from a lab DCR unit,the kinetic parameters of the 12-lump model were solved by the combination of Runge-Kutta method and BFGS algorithm,and the parameters are consistent with FCC reaction rules.The validation of the model indicates that the lumped division,the constructed reaction network and the calculated kinetic parameters were suitable and reliable.A simulation and optimization software for RFCC lumped kinetics model were developed to meet the modelling requirements with Python programming platform.Next,the influences of operation variables on reaction conversion in the DCR unit were examined,and the results indicated good consistence with FCC reaction rules.The established model can greatly reduce the workload of FCC catalyst evaluation with the DCR unit and is expected to guide the optimization for commercial RFCC unit.